BRONKHORST mini CORI-FLOW ML120 User manual

Doc. no.: 9.17.097 rev. K Date: 23-09-2020
ATTENTION
Pleaseread this documentcarefully beforeinstalling and operating the product.
Not following the guidelines could resultin personalinjury and/or damageto the equipment.
mini CORI-FLOW ML120
(Ultra) Low Flow
Coriolis Mass Flow Meters / Controllers
Instruction Manual

Bronkhorst®
Instruction Manual mini CORI-FLOW ML120 9.17.097K2
Copyright
© 2020 Bronkhorst High-Tech B.V.
All rights reserved. No part of this publication may be reproduced, distributed, or transmitted in any form or by any means,
without the prior written permission of the publisher.
Disclaimer
This document has been reviewed and is believed to be accurate. Bronkhorst High-Tech B.V. does not assume liability for
errors, inaccuracies or absence of information. The material in this document merely serves information and illustration
purposes; no rights can be derived from its contents.
Bronkhorst High-Tech B.V. reserves the right to modify or improve its products and documentation without informing
anyone. As such, the information contained in this document is subject to change without notice. Device specifications and
the contents of the package may deviate from what is stated in this document.
Symbols in this document
Important information. Disregarding this information could increase the risk of damage to the equipment, or the risk of
personal injuries.
Helpful information. This information will facilitate the use of the instrument and/or contribute to its optimal
performance.
Additional information available on the internet or from your Bronkhorst representative.
Receipt of equipment
Check the outside packaging box for damage incurred during shipment. If the box is damaged, the local carrier must be
notified at once regarding his liability, if so required. At the same time a report should be submitted to your Bronkhorst
representative.
Carefully remove the equipment from the box. Verify that the contents of the package was not damaged during shipment.
Should the equipment be damaged, the local carrier must be notified at once regarding his liability, if so required. At the
same time a report should be submitted to your Bronkhorst representative.
·Check the packing list to ensure that you received all of the items included in the scope of delivery
·Do not discard spare or replacement parts with the packaging material
Refer to Removal and return instructions about return shipment procedures.
Equipment storage
·The equipment should be stored in its original package in a climate controlled storage location.
·Care should be taken not to subject the equipment to excessive temperatures or humidity.
·See technical specifications for information about required storage conditions.

Bronkhorst®
Instruction Manual mini CORI-FLOW ML1209.17.097K 3
Warranty
Bronkhorst® products are warranted against defects in material and workmanship for a period of three years from the date
of shipment, provided they are used in accordance with the ordering specifications and not subject to abuse or physical
damage. Products that do not operate properly during this period may be repaired or replaced at no charge. Repairs are
normally warranted for one year or the balance of the original warranty, whichever is the longer.
See also section 9 (Guarantee) of the Conditions of sales:
www.bronkhorst.com/int/about/conditions-of-sales/
The warranty includes all initial and latent defects, random failures, and indeterminable internal causes. It excludes failures
and damage caused by the customer, such as contamination, improper electrical hook-up, physical shock etc.
Re-conditioning of products primarily returned for warranty service that is partly or wholly judged non-warranty may be
charged for.
Bronkhorst High-Tech B.V. or affiliated company prepays outgoing freight charges when any part of the service is
performed under warranty, unless otherwise agreed upon beforehand. The costs of unstamped returns are added to the
repair invoice. Import and/or export charges as well as costs of foreign shipping methods and/or carriers are paid by the
customer.
General safety precautions
This product is intended for use by qualified personnel who recognize shock hazards and are familiar with the safety
precautions required to avoid possible injury. Read the operating information carefully before using the product.
Before operating, make sure the line cord is connected to a properly grounded power receptacle. Inspect the connecting
cables for cracks or breaks before each use.
The equipment and accessories must be used in accordance with their specifications and operating instructions, otherwise
the safety of the equipment may be impaired.
Opening the equipment is not allowed. There are no user serviceable parts inside. In case of a defect please return the
equipment to Bronkhorst High-Tech B.V.
One or more warning signs may be attached to the product. These signs have the following meaning:
General warning; consult the instruction manual for handling instructions
Surface may get hot during operation
Shock hazard; electrical parts inside
To maintain protection from electric shock and fire, replacement components must be obtained from Bronkhorst. Standard
fuses, with applicable national safety approvals, may be used if the rating and type are the same. Other components that are
not safety related may be obtained from other suppliers, as long as they are equivalent to the original component. Selected
parts should be obtained only through Bronkhorst, to maintain accuracy and functionality of the product. If you are unsure
about the relevance of a replacement component, contact your Bronkhorst representative for information.

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Instruction Manual mini CORI-FLOW ML120 9.17.097K4

Bronkhorst®
Instruction Manual mini CORI-FLOW ML1209.17.097K 5
Table of contents
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Introduction 1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.1 Scope of this manual
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.2 Intended use
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.3 Product description
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81.4 Calibration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81.5 Maintenance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.6 Documentation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101.7 Model key
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101.8 Customized I/O options
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Starting up 2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.1 Functional properties
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.2 Operating conditions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Tested pressure 2.2.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13Sealing material 2.2.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.3 Piping requirements
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142.4 Mounting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142.5 Leak check
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142.6 Preventing hydraulic shocks
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142.7 Electrical connection
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152.8 Communication interface
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Analog or local interface 2.8.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Digital RS232 interface 2.8.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16E-8000 2.8.2.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16BRIGHT 2.8.2.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Digital RS485 interface 2.8.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17FLOW-BUS 2.8.3.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Modbus 2.8.3.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Other fieldbuses 2.8.3.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182.9 Micro switch operation and LED indications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182.10 Purging before use
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182.11 Zeroing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Zeroing using micro switch 2.11.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Zeroing through digital communication 2.11.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202.12 Powering up and powering down
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Operation 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213.1 Mass flow measurement and control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Instrument settings 3.1.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Valve safe state 3.1.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223.2 Temperature considerations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233.3 Analog operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233.4 Basic RS232 operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24FlowDDE 3.4.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Software (DDE applications) 3.4.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25Baud rate, node address and parity 3.4.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263.5 Basic RS485 operation (FLOW-BUS/Modbus)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26FLOW-BUS 3.5.1

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Modbus 3.5.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Software 3.5.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Baud rate, node address and parity 3.5.4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273.6 Other fieldbus configurations
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283.7 LED indications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293.8 Multifunctional switch
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Normal operating functions 3.8.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Power-up functions 3.8.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Control mode - readout/change 3.8.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31Network settings - readout/change 3.8.4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Digital parameters 4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344.1 General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 354.2 Device identification
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 364.3 Measurement and control
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Advanced measurement and control 4.3.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384.4 Alarms
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394.5 Counter
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 414.6 Network configuration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424.7 Special parameters
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44Default control mode 4.7.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444.8 Fluid set
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45Advanced fluid set parameters 4.8.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 464.9 Master/slave configuration (FLOW-BUS)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 474.10 Controller
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Batch dosing with CORI-FILL™ 5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 495.1 Dosing principle
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49Proportional control 5.1.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49Preventing overshoot 5.1.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50Estimated dosing time 5.1.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 505.2 Process conditions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 505.3 Parameter settings
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51Dosing method 5.3.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52Batch settings 5.3.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53Overrun correction 5.3.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54Disabling filters 5.3.4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55Proportional control settings 5.3.5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57On/off control settings 5.3.6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 585.4 Optimizing hints
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Troubleshooting and service 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 606.1 Restoring factory settings
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 606.2 Common issues
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 636.3 Service
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Returns 7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 647.1 Removal and return instructions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 647.2 Disposal (end of lifetime)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Parameter index

Bronkhorst®
Instruction Manual mini CORI-FLOW ML1209.17.097K 7
1Introduction
1.1 Scope of this manual
This manual contains general product information, installation and operating instructions and troubleshooting tips for the
mini CORI-FLOW ML120 series mass flow meters and controllers for liquids and gases.
1.2 Intended use
The Bronkhorst® series mini CORI-FLOW ML120 is an accurate mass-flow meter/controller for measuring gas and liquid
flows at pressures up to 200 bar(a) depending on body rating, virtually independent of pressure and temperature changes.
The mini CORI-FLOW is a real mass-flow meter/controller and measures the flow in mass, it does not matter what the
properties of the gases or liquids are. The system can be completed with an internal piezo control valve and a flexible
readout unit to measure and control gas and liquid flows.
The wetted materials incorporated in the mini CORI-FLOW are compatible with media and conditions (e.g. pressure,
temperature) as specified at ordering time. If you are planning to use the product (including any third party components
supplied by Bronkhorst, such as pumps or valves) with other media and/or other conditions, always check the wetted
materials (including seals) for compatibility. See the technical specifications of the product and consult third party
documentation (if applicable) to check the incorporated materials.
Responsibility for the use of the equipment with regard to suitability, intended use, cleaning and corrosion resistance of the
applied materials against the processed media lies solely with the end user.
Where appropriate, this document recommends or prescribes safety measures to be taken with respect to media usage or
working with the described equipment under the specified conditions. The end user is responsible for taking the necessary
safety precautions and proper use of appropriate (personal) protective equipment, even if such is not explicitly
recommended or required in this document.
The end user is considered to be familiar with the necessary safety precautions, and to comply with the appropriate
protective measures as described in the Material Safety Data Sheets of the media to be used in the system (if applicable).
Bronkhorst High-Tech B.V. cannot be held liable for any damage resulting from improper or unsafe use, use for other than
the intended purpose or use with other media and/or under other conditions than specified on the purchase order.
1.3 Product description
mini CORI-FLOW ML120 instruments by Bronkhorst® are precise and compact Mass Flow Meters and Controllers for liquids
and gases, based on the Coriolis measuring principle. Designed to cover the needs of the (ultra) low flow market, from 5 g/h
up to 200 g/h (full scale values), the mini CO RI-FLO W offers multi-range functionality: factory calibrated ranges can be
rescaled by the user, maintaining the original accuracy specifications.
Measuring principle
Instruments of the mini CORI-FLOW series contain a uniquely shaped, single loop sensor tube, forming part of an
oscillating system. When a fluid flows through the tube, the Coriolis force causes a phase shift, which is detected by sensors
and fed into the integrated printed circuit board. The resulting output signal is proportional to the real mass flow rate,
independent of fluid density, temperature, viscosity, pressure, heat capacity or conductivity. Coriolis mass flow
measurement is fast, accurate and inherently bi-directional. The mini CORI-FLOW ML120 features density and temperature
of the fluid as secondary outputs.

Bronkhorst®
Instruction Manual mini CORI-FLOW ML120 9.17.097K8
Multi-range
The mini CORI-FLOW ML120 offers multi-range functionality: factory calibrated ranges can be re-ranged to a different full
scale range (e..g. a mini CORI-FLOW model ML120 can be used for full scale ranges between 5 g/h and 200 g/h). The analog
output and the digital measured value are scaled accordingly.
Switching between ranges can be done using the RS232 interface or the fieldbus interface. For RS232 communication,
Bronkhorst offers free tooling software (FlowPlot).
The instrument comes with a calibration certificate for all supported full scale ranges. The actual full scale of the instrument
is set to a value as ordered and can be found on the serial number label.
Accuracy
The accuracy of a mini CORI-FLOW is either 0.2% reading for liquids or 0.5% reading for gases, based on mass flow (e.g. g/h,
kg/h, etc.). Using the instrument for measuring volume flows (e.g. l/h, ml/min) will introduce an additional inaccuracy, based
on the actual density measured by the instrument. In all instruments capable of density measurement there will be an
automatic adjustment for change in density.
CORI-FILL™
mini CORI-FLOW instruments with firmware version 1.05g and up are equipped with CORI-FILL™ technology, designed for
fast and highly accurate mass or volume batch dosing of liquids or gases. The internal batch dosing controller is optimized
for controlling a valve or a (gear) pump, to deliver an exact batch dose, independent of fluid properties, ambient
temperature and back pressure.
1.4 Calibration
The mini CORI-FLOW is factory calibrated. Periodical inspection, recalibration or verification of the accuracy may be subject
to individual requirements of the end user.
Bronkhorst certifies that the instrument meets the rated accuracy. Calibration has been performed using measurement
standards traceable to the Dutch Metrology Institute (VSL).
Unless specified otherwise, mini CORI-FLOW ML120 instruments are H20 calibrated.
1.5 Maintenance
The mini CORI-FLOW needs no regular maintenance if operated properly, with clean media, compatible with the wetted
materials, avoiding pressure and thermal shocks and vibrations. Units may be purged with a clean, dry and inert gas or a
non-aggressive and non-corrosive solvent.
In case of severe contamination, cleaning of the inside of the instrument and of the valve orifice (if applicable) may be
required.
Inexpertly servicing instruments can lead to serious personal injury and/or damage to the instrument or the system it is
used in. Servicing must therefore be performed by trained and qualified personnel. Contact your Bronkhorst representative
for information about cleaning and calibration. Bronkhorst has a trained staff available.

Bronkhorst®
Instruction Manual mini CORI-FLOW ML1209.17.097K 9
1.6 Documentation
The documentation listed in the following table is available on the mini CORI-FLOW product pages under
www.bronkhorst.com/products
Type
Document name
Document no.
Brochures
mini CORI-FLOW Brochure
9.60.056
Manuals
Instruction Manual mini CORI-FLOW ML120 (this document)
9.17.097
Quick Installation Guide mini CORI-FLOW
9.17.093
Technical documentation
Hook-up diagram Analog/RS232
9.16.132
Hook-up EtherNet/IP
9.16.222
Hook-up diagram CANopen
9.16.218
Hook-up diagram DeviceNet™
9.16.135
Hook-up diagram EtherCAT®
9.16.137
Hook-up diagram FLOW-BUS
9.16.133
Hook-up diagram Modbus ASCII / RTU
9.16.136
Hook-up diagram Modbus TCP
9.16.235
Hook-up diagram PROFIBUS DP
9.16.134
Hook-up diagram PROFINET
9.16.146
Hook-up diagram optional bus and I/O configurations
9.16.131
Dimensional drawing
7.05.925
The documentation listed in the following table can be downloaded from www.bronkhorst.com/downloads
Type
Document
Document no.
General documentation
EU Declaration of Conformity
9.06.021
Manuals
Manual DeviceNet™ interface
9.17.026
Manual EtherNet/IP interface
9.17.132
Manual CANopen interface
9.17.131
Manual EtherCAT® interface
9.17.063
Manual FLOW-BUS interface
9.17.024
Manual Modbus ASCII / RTU / TCP interface
9.17.035
Manual PROFIBUS DP interface
9.17.025
Manual PROFINET interface
9.17.095
Manual RS232 interface
9.17.027

Bronkhorst®
Instruction Manual mini CORI-FLOW ML120 9.17.097K10
1.7 Model key
The model key on the serial number label contains information about the technical properties of the instrument as ordered.
The specific properties can be retrieved with the diagram below.
1.8 Customized I/O options
mini CORI-FLOW ML120 instruments offer several customized input/output functions through pin 5 of the M12 connector
as an option. The required I/O options are factory installed as specified at ordering time, and cannot be changed manually.
The possible configurations are described in the table below. See the hook-up diagram for custom bus and I/O
configurations (document 9.16.118) for an explanation of the codes.
Code
Description
000
Disabled, pin 5 is pulled down to 0 Vdc (default selection)
A1V
0…10 Vdc sourcing output, controller
Analog signal for pump or external valve steering (control signal only).
When the controller output is used for pump or external valve steering (only applicable to mass flow
meters with the controller function enabled), make sure to set parameter Valve maximum to 0.3 [A]. For mass
flow controllers, the controller output signal represents the valve actuator current. This output is limited to
a value below 10 Vdc, due to the maximum valve current restriction.
B1V
4…20 mA sourcing output, controller
Analog signal for pump or external valve steering (control signal only).
When the controller output is used for pump or external valve steering (only applicable to mass flow
meters with the controller function enabled), make sure to set parameter Valve maximum to 0.3 [A]. For mass
flow controllers, the controller output signal represents the valve actuator current. This output is limited to
a value below 20mA, due to the maximum valve current restriction.
C3A
Digital output, min/max alarm
During a min/max alarm, pin 5 is pulled down to 0 Vdc.
C4A
Digital output, counter alarm
During a counter alarm, pin 5 is pulled down to 0 Vdc.

Bronkhorst®
Instruction Manual mini CORI-FLOW ML1209.17.097K 11
Code
Description
C5S
Example for C5S or C0I hook-up
Digital output, enabled by setpoint (for shut-off control)
Pin 5 is pulled down to 0 Vdc at a controller setpoint, e.g. for shut-off
valve activation.
For factory selected analog control (…-A#-C5S):
If parameter Control mode is set for analog control by factory, the
minimum setpoint at which the device (shut-off valve) connected to pin 5
is activated is 1.9%. This prevents possible noise on the analog input
activating the device accidentally.
For factory selected digital control (…-D#-C5S):
If parameter Control mode is set for digital control by factory, the setpoint threshold for activating the
device connected to pin 5 is any value > 0.
Note: If the instrument is forced into Valve Safe State, the digital output is not affected, so a (n/c) shut-off
valve connected to pin 5 will not close when the (n/c) controller is in Valve Safe State.
Make sure to use 24 Vdc power supply corresponding to the shut-off valve specifications. Cable 7.03.572 (T-
part 9-pin D-sub/loose end) or 7.03.603 (T-part 9-pin D-sub/DIN43650C) can be used for this operating
option.
C0I
Digital output, high/low switch using remote parameter (e.g. for shut-off valve control)
Pin 5 is pulled down to 0 Vdc when writing value 1 to parameter IO switch status, this is undone by writing
value 0.
A device connected to pin 5 (e.g. a shut-off valve) can be activated/deactivated by writing parameter IO
switch status.
Note: If the instrument is forced into Valve Safe State, the digital output is also affected, so a (n/c) shut-off
valve connected to pin 5 will be closed when the (n/c) controller is in Valve Safe State.
Make sure to use 24 Vdc power supply corresponding to the shut-off valve specifications. Cable 7.03.572 (T-
part 9-pin D-sub/loose end) or 7.03.603 (T-part 9-pin D-sub/DIN43650C) can be used for this operating
option.
D9E
Digital frequency output, measure
Measurement value is translated to a frequency within given frequency range.
The default frequency range to represent 0…100% flow is 0…10000 Hz. Any other frequency range must be
specified on order.
F9B
Example for F9B hook-up
Digital pulse output, batch counter
Pin 5 is pulled down to 0 Vdc when a given batch size is
reached (during a given pulse length).
By default, a pulse is given at each 1x the Counter unit batch
value, with a pulse length of 1 second. For instance, when
Counter unit is set to 'ln', a pulse is given each time 1 ln has
passed through the instrument. An alternative pulse length
must be specified on order.
Provide a pull-up resistor of 5…10 kOhm to create 15…24 Vdc at pin 5 (according to the applicable hook-up
diagram).
I3C
Digital input, controller mode valve close
Valve closes when pin 5 is connected to 0 Vdc.
This option switches between the default Control mode and mode ‘Valve Close’ (value 3). When the default
Control mode is digital, the default value is 0 (bus/RS-232), when the default Control mode is analog, the
default value is 1 (Analog input).

Bronkhorst®
Instruction Manual mini CORI-FLOW ML120 9.17.097K12
Code
Description
I8C
Digital input, controller mode valve purge
Valve is fully opened when pin 5 is connected to 0 Vdc.
This option switches between the default Control mode and mode ‘Valve Fully Open’ (value 8). When the
default Control mode is digital, the default value is 0 (bus/RS-232), when the default Control mode is analog,
the default value is 1 (Analog input).
I1R
Example for I1R or I2R hook-up
Digital input, reset counter
The counter resets when pin 5 is connected to 0 Vdc.
I2R
Digital input, reset alarm
The alarm resets when pin 5 is connected to 0 Vdc.

Bronkhorst®
Instruction Manual mini CORI-FLOW ML1209.17.097K 13
2Starting up
2.1 Functional properties
Before installing your mini CORI-FLOW ML120, check the serial number label on the rear side of the
instrument to see if the functional properties match your requirements:
·Flow rate
·Fluid to be measured
·Up- and downstream pressures
·Temperature
·Valve type (NO= Normally Open)
·Input/output signal (see also Electrical connection)
The Lab-style instrument housing is rated at IP40.
2.2 Operating conditions
2.2.1 Tested pressure
mini CORI-FLOW instruments are pressure tested to at least 1.7 times the specified operating pressure,
with a minimum of 340 bar(a) for meters and 8.5 bar(a) for controllers. Each instrument is also
outboard leak tested to at least 2*10-9 mbar l/s Helium.
The tested pressure is specified on the instrument with a red sticker. If this sticker is missing or if the specified pressure is
insufficient, the instrument must not be used and should be returned to the factory.
Before installation, make sure that the tested pressure is in accordance with the safety factor of your application. The tested
pressure must always be higher than the maximum operating pressure.
Disassembling the instrument and/or replacing parts of it will invalidate the pressure test specification.
2.2.2 Sealing material
mini CORI-FLOW ML120 instruments are equipped with specific sealing material(s), compatible with the media specified
at ordering time. Be sure that the sealing materials are compatible with the media and conditions used in the system. Do
not exceed the indicated maximum operating pressure and temperature. Bronkhorst High-Tech B.V. cannot be held
responsible for any damage resulting from the use of other media and/or conditions than specified at ordering time.
mini CORI-FLOW ML120V00 instruments are metal sealed.
mini CORI-FLOW ML120V21 instruments are equipped ex factory with internal sealings in the piezo-valve, compatible with
the media specified at ordering time. As a factory standard, the instruments are provided with Kalrez® (FFKM) seals.
2.3 Piping requirements
MAKE SURE THAT THE PIPING IS ABSOLUTELY CLEAN!
Particles can damage or clog the instrument. The piezo valve’s metal membrane can be seriously damaged by particles in
the fluid.
During the manufacturing process, the instrument has been tested with water. Despite the fact that it has been purged
thoroughly afterward, the instrument cannot be guaranteed to be absolutely free of water droplets upon delivery. For
applications where remaining water particles might cause undesired reactions, such as corrosion, Bronkhorst strongly
recommends performing an additional, adequate drying procedure.

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Instruction Manual mini CORI-FLOW ML120 9.17.097K14
2.4 Mounting
For the mini CORI-FLOW ML120 proper stable mounting is strongly advised on
a rigid, solid base for optimal accuracy. For optimal isolation from vibrations in
the area, rubber suspension pads can be used.
The picture to the right shows an example of a mini CORI-FLOW ML120 with a
mass block, one of the options Bronkhorst can provide for isolation from
vibrations in the environment where the instrument is used.
2.5 Leak check
Bronkhorst® mini CORI-FLOW meters/controllers are fitted with compression or face-seal-fittings.
For leak tight installation of compression type fittings make sure that the tube is inserted to the shoulder in the fitting
body and that no dirt or dust is present on tube, ferrules or fittings. Tighten the nut finger-tight; while holding the
instrument and then tighten the nut 1 turn.
If applicable follow the guidelines of the supplier of the fittings. Special types of fittings are available on request.
Check the fluid system for leaks before applying full operating pressure, especially when using hazardous media (e.g. toxic
or flammable).
After using the mini CORI-FLOW for the first time with low temperature media, re-tighten the fluid connections, in order to
prevent leakage.
2.6 Preventing hydraulic shocks
In a fluid system where fluid movement (liquid or gas) is forced to stop or start suddenly (by a pump or a shut-off valve), a
hydraulic shock (or fluid hammer) can occur, especially if the fluid velocity is high. This momentum change causes a
pressure surge (spike) traveling repeatedly from one end of the piping to the other. Rapid pressure fluctuations like this can
cause leakage and damage to fluid lines and components, and ultimately damage to the instrument.
The following measures can be taken to prevent or minimize hydraulic shocks:
·Avoid abrupt fluid acceleration and deceleration
oAvoid large pipe diameter transitions by using piping and tubing with an inside diameter that matches that of the
instrument as closely as possible
oKeep the fluid velocity through the instrument as small as possible
·Install an accumulator to dampen acceleration and deceleration of the fluid flow
Consult your Bronkhorst representative if you need more information about prevention of hydraulic shocks.
2.7 Electrical connection
Electrical connection must be made with standard cables or according to the applicable hook-up diagrams. The factory
installed 9-pin D-sub settings are indicated on the serial number label. Make sure that the power supply is suitable for the
power ratings as indicated on the serial number label and that double or reinforced insulation is used for the power supply.
Bronkhorst recommends using their standard cables. These cables have the right connectors and if loose ends are used,
these are marked to prevent wrong connection.
mini CORI-FLOW ML120 instruments are powered with +15…+24 Vdc. See the hook-up and cabling examples in section
Communication interface
Never power the instrument simultaneously from two different power sources (e.g. fieldbus and Plug-in Power Supply).
Doing so will damage the printed circuit board irreparably.

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Instruction Manual mini CORI-FLOW ML1209.17.097K 15
The device described in this document contains electronic components that are susceptible to electrostatic discharge. In
order to prevent damage, proper handling procedures must be followed during installation, (dis)connecting and removing
the electronics.
The device carries the CE-mark and is compliant with the concerning EMC requirements. However, EMC requirements
can only be met using appropriate cables and connector/gland assemblies. Bronkhorst recommends the use of their
standard cables. These cables have the right connectors and loose ends (if any) are marked to help prevent wrong
connection. When using other cables, cable wire diameters must be sufficient to carry the supply current, and voltage loss
must be kept as low as possible. When in doubt, contact your Bronkhorst representative.
When connecting the product to other devices, be sure that the integrity of the shielding is not affected; always use
shielded cabling for signals and communication and do not use unshielded wire terminals.
2.8 Communication interface
The table below shows the different (fieldbus) interfaces that can be installed. LED indications and the use of the micro
switch button on top of the instrument are explained in LED indications and Multifunctional switch respectively.
Analog/RS232
An analog and (digital) RS232 interface are always available on mini CORI-FLOW ML120 instruments. A fieldbus interface is
optional.
·The analog and RS232 interface are made available through a 9-pin D-sub connector on the side of the instrument
osee Analog or local interface and Digital RS232 interface
·FLOW-BUS and Modbus communication is possible through the 9-pin D-sub side connector, as well as via an optional
fieldbus connector on the top of the instrument
osee Digital RS485 interface
·All other fieldbus interfaces are strictly made available through a connector on top of the instrument
osee Digital RS485 interface
2.8.1 Analog or local interface
Connect the mini CORI-FLOW ML120 instrument to the power supply/readout unit using a cable with 9-pin D-sub connector
according to the Bronkhorst® standard for the Sub-D9 connector.
Refer to the hook-up diagram for analog operation (document 9.16.119) or use a 9-pin D-sub loose-end cable (7.03.004 (3m),
7.03.536 (5m) or 7.03.537 (10m)) to connect the required signals.
Power
Analog output
Analog input
(controller)
: +15...+24 Vdc
: 0...5 Vdc / 0...10 Vdc
0...20 mA / 4...20 mA
: 0...5 Vdc / 0...10 Vdc
0...20 mA / 4...20
mA

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Instruction Manual mini CORI-FLOW ML120 9.17.097K16
The following analog signals are available through the 9-pin D-sub side connector:
·Pin 2: measured value (analog output)
·Pin 3: setpoint (analog input)
The factory selected analog interface (0…5 Vdc; 0…10 Vdc; 0…20 mA or 4…20 mA) can be found in the model key of the
instrument (see Model key) and in the pin description on the serial number label.
When operating the instrument through the analog interface it is possible to connect the instrument simultaneously to
RS232 for reading/changing parameters (e.g. settings or fluid selection).
2.8.2 Digital RS232 interface
A special T-part cable (7.03.366) is required for connecting the
9-pin D-sub side connector of a mini CORI-FLOW ML120
instrument to a COM port of a Windows computer for RS232
communication. Optionally use an RS232 to USB2.0 converter
(9.09.122) to connect to a USB port. Use a Plug-in Power Supply
(PiPS) (7.03.422) for powering the instrument.
Alternatively use a 9-pin D-sub loose-end cable and refer to
the hook-up diagram for RS232 operation (document 9.16.119)
to connect the required signals, typically for connection to a
PLC or micro controller device.
If an instrument is powered through the (optional) bus
connector on top of the instrument, the 9-pin D-sub side
connector can be connected to a COM port directly, using a T-
part cable 7.03.366 or an RS232 cable 7.03.367. The figure on the
right shows a hook-up example for DeviceNet™.
Keep in mind that the 9-pin D-sub configuration of a Bronkhorst® instrument differs from the 9-pin D-sub configuration of
a PC COM-port. Make sure the correct cables are used for hook-up. When in doubt, always check the hook-up diagrams
associated with the instruments.
·Consult Instruction manual PiPS (document no. 9.17.055) for more information about the Plug-in Power Supply
·Consult Instruction manual RS232 interface (document no. 9.17.027) for more information about hook-up and
communication
Both documents can be downloaded from www.bronkhorst.com/downloads
2.8.2.1 E-8000
When a mini CORI-FLOW ML120 instrument is used in
combination with an E-8000 readout/ control unit equipped
with an RS232 interface, the instrument can be powered and
operated using the 9-pin D-sub (female) connector at the rear
of the E-8000 module and a cable 7.03.016 or equivalent. With
the display interface and control buttons most digital
parameters can be used. See the E-8000 manual (document
9.17.076) for more information.
2.8.2.2 BRIGHT
When a mini CORI-FLOW ML120 instrument is used in
combination with a BRIGHT readout and control module, most
digital functions are available by using the display interface
and control buttons. If a BRIGHT module is connected, no other
RS232 communication with the instrument can be established.
For more information see the BRIGHT manual (document
9.17.048).
2.8.3 Digital RS485 interface
With digital operation over RS485 or Ethernet a fieldbus system with multiple instruments can be set up. This section shows
examples of several of mini CORI-FLOW ML120 instruments in an RS485 fieldbus system. Note that many other bus

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Instruction Manual mini CORI-FLOW ML1209.17.097K 17
configurations are possible, contact your local sales representative for more information. Please check the total power
consumption of your instruments and do not exceed the maximum power of the power supply.
For all fieldbus systems the mini CORI-FLOW ML120 instruments serve as slaves on the master/slave bus system. There is no
mutual communication between slaves, only between master and slave.
2.8.3.1 FLOW-BUS
In the image below an E-8000 power supply/readout control unit with FLOW-BUS interface is connected to two mini CORI-
FLOW ML120 instruments via the RJ-45 top-connector FLOW-BUS interface. In this example one instrument serves as 'local
host' for communicating with a Windows computer to all instruments on the bus via an available RS232 connector. Note:
communication with all the instruments on the FLOW-BUS system is possible when using an mini CORI-FLOW ML120
instrument as local-host RS232/FLOW-BUS interface. It is also possible to use multiple local-host RS232/FLOW-BUS interfaces
in a FLOW-BUS system simultaneously.
Power the instruments in a FLOW-BUS local-host system by hooking-up the power supply directly on the FLOW-BUS line
and not by powering a set of instruments through the 9-pin D-sub connector on one of the digital instruments.
Consult Instruction manual FLOW-BUS interface (document no. 9.17.024) for more information about hook-up and
communication.
2.8.3.2 Modbus
In the example below the Modbus power supply is provided by an E-8000. The instruments are connected to the bus via
RS485 cables with RJ-45 connector and a Multiport connector. The RS485 - USB2.0 adapter can be used to connect the system
to a Modbus master device.

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Instruction Manual mini CORI-FLOW ML120 9.17.097K18
·See Instruction manual Modbus interface (document no. 9.17.035) for more information about hook-up and
communication.
·See Instruction manual E-8000 (document no. 9.17.076) for more information about power supply and
communication options of the E-8000.
2.8.3.3 Other fieldbuses
PROFIBUS DP
PROFIBUS DP is a 2-wire, RS-485-based industrial data communication standard (fieldbus) which allows automation
components (e.g. sensors, actuators and controllers) to exchange information.
Consult Instruction manual PROFIBUS DP interface (document no. 9.17.025) for more information about setting up a
PROFIBUS DP network.
DeviceNet™
The DeviceNet™ interface offers a direct connection to a DeviceNet™ network, according to the mass flow controller profile
specified by the ODVA. The Bronkhorst® DeviceNet™ instrument is a Group 2 Only Server device whose messages comply
with the Controlled Area Network (CAN) 2.0A standard and with the DeviceNet™ protocol.
Consult Instruction manual DeviceNet™ interface (document no. 9.17.026) for more information about setting up a
DeviceNet™ network.
EtherCAT®
Ethernet for Control Automation Technology (EtherCAT®) is an open high performance Ethernet based fieldbus system.
Consult Instruction manual EtherCAT® interface (document no. 9.17.063) for more information about setting up an
EtherCAT® network.
PROFINET
The PROFINET interface is 100% Ethernet compatible and is used for data exchange between I/O controllers (PLC, etc.) and
I/O devices (slaves, field devices). PROFINET uses the proven communication model and application view of PROFIBUS DP.
Consult Instruction manual PROFINET interface (document no. 9.17.095) for more information about setting up a
PROFINET network.
2.9 Micro switch operation and LED indications
Using the two colored LEDs and the micro switch on the instrument,
several actions can be monitored and started.
·The green • LED is used for status indication.
·The red • LED is used for errors, warnings and messages.
·The switch can be used to start several actions, such as auto-zero,
restore factory settings and bus-initialization actions, if applicable.
For the zero-procedure see Zeroing.
For an overview of all possible LED indications, see LED indications.
The micro switch on top of the mini CORI-FLOW ML120 can be operated with a thin, metal or hard plastic pin, e.g. the
end of a paperclip. Avoid excessive force when operating the switch.
2.10 Purging before use
In systems for use with corrosive, reactive or explosive media, purging for at least 30 minutes with a dry, inert gas (like
Nitrogen or Argon) is absolutely necessary before use. After use with corrosive or reactive fluids, complete purging is also
required before exposing the system to air.
Prevent chemical reactions inside the tubes or instrument as this will tend to clog up or corrode the system.
2.11 Zeroing
Zeroing of a mini CORI-FLOW instrument is required each time process conditions have been changed.

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Instruction Manual mini CORI-FLOW ML1209.17.097K 19
What is zero-stability?
Due to mechanical construction of the sensor tubes each mini CO RI-FLOW sensor will have a very small offset signal, even
when the mass flow is zero. This is called the zero-stability error and is specified for accuracy separately for all Coriolis
instruments. Main reason for this is the fact that this error can be (temporarily) neutralized after performing a zero-action.
Immediately after zeroing, zero-stability error is 0%. However, it is allowed to move between a certain band depending on
the environment (process) and fluid conditions.
In ideal situations, where actual process conditions do not change, this error will remain the same.
See below for possible reasons of change of zero-stability.
Model*
DN (mm)
Zero-stability
Nominal flow
ML120
0.25
< 0.01 g/h
100 g/h
* Zero-stability depends on the (mini) CORI-FLOW model
In practice zero-stability turns out to be better than the values in the table, but for calculation we will take worst case
values.
Process conditions
Each time process conditions have been changed significantly a (mini) CORI-FLOW needs to be zeroed in order to get rid of
the offset error due to zero-stability. At least the very first time an instrument is used a zero procedure will be required.
The zero-stability error will mainly change when one or more of the following items change significantly:
·Temperature (of fluid or environment)
·Mounting of the (mini) CORI-FLOW instrument
Less important items:
·Pressure
·Density of fluid
·Vibrations working on instrument via environment
·Pulsation of supply pressure working on instrument
Zero Procedure
There are two ways to perform zeroing of a (mini) CORI-FLOW instrument:
1. With the micro-switch
2. Through digital communication
Always make sure that there is absolutely no flow when the instrument is performing the (auto-)zero procedure and there
are no mechanical vibrations or pulsating inlet pressures.
If the instrument has problems finding a proper and stable zero, it will repeat the auto-zero procedure up to 4 times. Each
time when no proper zero can be achieved, the instrument will give a short notice, signaling its LEDs after the procedure.
The red and green LED will blink alternating for a few seconds to indicate that the auto-zero was not able to find a zero
point (because of too much noise in the signal). This is mostly the case when the instrument is placed in a vibrating
environment. When ready zeroing after trying max. 4 times, the final result for the zero value will be a moving average
value of all attempts. The instrument will save this zero value into its non-volatile memory and will keep this value until the
next zero-procedure is performed. The mini CORI-FLOW will accept a proper zero point only if the measured signal is within
a limited noise band. Best way to achieve this is to avoid external noise influences. However, when this is not possible, filter
settings of the mini CORI-FLOW can be changed to improve noise immunity.
2.11.1 Zeroing using micro switch
The zero-point of each instrument is factory adjusted. If so required the zero point may be re-adjusted
over RS232, fieldbus or by means of using the micro switch.
Procedure for zeroing by micro switch:
1. Set process conditions
Warm-up (for a minimum of 30 minutes), pressurize the system and fill the instrument according to the process
conditions.
2. Stop flow
Make sure no flow is going through the instrument by closing valves near the instrument. The setpoint must be zero.
3. Press and hold, until the GREEN LED is on, then release button
Press the micro switch and hold it. After a short time the red • LED will go ON and OFF, then the green • LED will go
ON. At that moment (which is 8...12 s after pressing) release the switch.

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Instruction Manual mini CORI-FLOW ML120 9.17.097K20
4. Zeroing
The zeroing procedure will start at that moment and the green • LED will blink fast. The procedure will take
approximately 60 seconds.
5. Ready
When the indication is showing 0% signal and the green • indication LED is glowing continuously again, the zeroing
action was successful.
2.11.2 Zeroing through digital communication
It is also possible to start the zero adjustment procedure through digital communication:
·Through FLOW-BUS, using an E-8000 readout/control module
·Through FLOW-BUS, via a RS232/FLOW-BUS converter using software on a PC or PLC
·Through RS232, using software on a Windows computer or a PLC
·Through RS232, using a BRIGHT compact local readout/control module
·Through other fieldbus system (PROFIBUS DP/DeviceNet™/Modbus)
1. Set process conditions
Warm up and pressurize the system and fill the instrument according to the process conditions.
2. Stop flow
Make sure there is no flow through the instrument by closing the shut-off valves before and after the instrument.
3. Send parameters
Send the following parameter values in this sequence:
oInit Reset: 64
oControl Mode: 9
oCalibration Mode: 255
oCalibration Mode: 0
oCalibration Mode: 9
4. Zeroing
The zeroing procedure will start at that moment and the green LED will blink fast. The zeroing procedure waits for a
stable signal and saves the zero. If the signal is not stable zeroing, it will take a long time and the nearest point to zero
is accepted. The procedure will take approximately 60 seconds.
Make sure there is no flow through the instrument when performing the zeroing procedure.
5. Ready
When indication is showing 0% signal and the green indication LED is glowing continuously again, then zeroing has
succeeded. Parameter Control Mode reverts to its original value. As last send 0 to parameter Init Reset.
2.12 Powering up and powering down
·It is recommended to turn on power before applying fluid pressure and to switch off power only after relieving fluid
pressure.
·For best performance, allow the device to warm up and stabilize for at least 30 minutes before starting measurement
and/or control. This may be done with or without media flow.
When applying pressure, avoid pressure shocks and bring the fluid system gradually up to the level of the specified
operating conditions; open the fluid supply gently.
Make sure (in case of a controller) that the used control valve can withstand the system pressure and the maximum delta
pressure allowed.