BRONKHORST FLEXI-FLOW Compact User manual

FLEXI-FLOW™ Compact
Doc. no.: 9.17.158 rev. D Date: 30-01-2023
Instruction Manual
ATTENTION
Pleaseread this documentcarefully beforeinstalling and operating the product.
Not following the guidelines could resultin personalinjury and/or damage to theequipment.
Keep this document for future reference.

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact 9.17.158D2
Copyright
© 2023 Bronkhorst High-Tech B.V. - All rights reserved.
Bronkhorst® is a registered trademark of Bronkhorst High-Tech B.V.
All other trademarks are the property of their respective owners.
Disclaimer
The illustrations in this document serve to provide general notices regarding correct operation. The illustrations are
simplified representations of the actual situation and may differ from the actual product.
Bronkhorst High-Tech B.V. reserves the right to modify or improve its products and documentation without notice. Prior to
work, check whether a newer version of this document is available on the Bronkhorst website.
Symbols in this document
Important information. Disregardingthisinformationcould increasetheriskofdamage to theequipment, or theriskof
personal injuries.
Tips, useful information, attentionpoints. Thiswill facilitate theuse oftheinstrument and/or contributetoits optimal
performance.
Additional informationavailableinthereferenced documentation, onthe indicatedwebsite(s)or from your Bronkhorst
representative.
Service
If you have a question about a product or if you find the product does not meet the
specifications as ordered, do not hesitate to contact your Bronkhorst representative. To enable us
to help you quickly and effectively, make sure to have the serial number (SN) ready whenever
seeking contact with your Bronkhorst representative about a specific item.
For current information about Bronkhorst® and worldwide service addresses, please visit our website:
 www.bronkhorst.com
Do you have any questions about our products? Our Sales department will gladly assist you selecting the right product for
your application. Contact sales by e-mail:
 [e-mail]
For after-sales questions, help and guidance, our Customer Care department is available by e-mail:
 [e-mail]
No matter the time zone, our experts within the Customer Care department are available to answer your request
immediately or take appropriate further action. Our experts can be reached at:
 [phone]
Bronkhorst High-Tech B.V.
Nijverheidsstraat 1A
NL-7261 AK Ruurlo
The Netherlands

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact9.17.158D 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.
Seealso section9 (Guarantee) of theConditions 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.
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. 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. At the same time a
report should be submitted to your Bronkhorst representative.
· Checkthepackinglist to ensurethat youreceivedall itemsincluded inthescopeof delivery
· Do not discardspareor replacement partswiththepackagingmaterial
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 (data sheet) for information about required storage conditions.
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Instruction Manual FLEXI-FLOW™ Compact 9.17.158D4

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact9.17.158D 5
Table of contents
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
General information1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.1 Scope of this document
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.2 Intended use
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71.3 Product overview
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81.4 Product features
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Offline/parallel configuration1.4.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Instrument status (NAMUR)1.4.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Multi-parameter functionality1.4.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8On-board FLUIDAT® database1.4.4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Multi-modular systems1.4.5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91.5 Documentation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101.6 Safety notes
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Installation2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.1 Product specifications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Pressure rating2.1.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11Bluetooth certification2.1.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.2 Mounting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Piping requirements2.2.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Fluid connection2.2.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Preventing pressure shocks2.2.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.3 Electrical connection
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132.4 Fieldbus connection
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Operation3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143.1 General procedures
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Powering up3.1.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14First use3.1.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14After use3.1.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Powering down3.1.4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Instrument status3.1.5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153.2 Special procedures
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Changing communication settings3.2.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15Fluid selection3.2.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Switching control function3.2.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Bluetooth configuration3.2.4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Adjusting zero point3.2.5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193.3 Maintenance
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Cleaning3.3.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Calibration3.3.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193.4 Troubleshooting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Zooming in on NAMUR status3.4.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Default valve state3.4.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Common issues3.4.3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223.5 Returns
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Removal and return instructions3.5.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Disposal (end of lifetime)3.5.2

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact 9.17.158D6
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Communication interface4
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234.1 Fieldbus communication
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234.2 Bluetooth or support interface?
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234.3 Parameters
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Measurement and control4.3.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26Advanced measurement and control4.3.1.1
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Advanced fluid set parameters4.3.5.1
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Fluid mixture parameters4.3.5.2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Master/slave configuration (FLOW-BUS)4.3.6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Digital input and output4.3.7
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35Device identification4.3.8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36Bluetooth4.3.9
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37Operational history4.3.10
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38Diagnostics4.3.11
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39Special parameters4.3.12
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 414.4 Multi-parameter addressing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424.5 Gateway (multi-modular systems)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Parameter index

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact9.17.158D 7
1 General information
1.1 Scope of this document
This document contains general product information, installation and basic operating instructions and troubleshooting tips
for the FLEXI-FLOW™ Compact.
1.2 Intended use
The FLEXI-FLOW™ has been developed to measure and/or control mass flow rates and pressures of clean, dry, non-corrosive
and non-toxic gases in a fluid system.
The product is suited for general purpose dry indoor applications, like laboratories and machine enclosures, applying media
and operating conditions within the limits as specified in the FLEXI-FLOW™ Compact datasheet .
Any other use is considered as not intended and improper. Improper use might cause damage to the product and/or
propose danger to users and/or bystanders and is therefore not permissible.
Responsibility for application of the product in accordance with its intended use, suitability for the intended application,
cleaning and compatibility of the used media with the applied materials lies solely with the user.
Bronkhorst High-Tech B.V. cannot be held liable for any damage and/or injury resulting from unintended, improper or
unsafe use.
1.3 Product overview
1. Power and signal connector (9-pin D-sub)
2. Address selector (rotary switch)
3. Support interface (USB-C)
4. Fluid inlet
5. Status indication light
6. Control valve (optional)
7. Fluid outlet
8. Flow direction
9

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact 9.17.158D8
1.4 Product features
1.4.1 Offline/parallel configuration
The instrument is fitted with a support interface (USB-C) and a Bluetooth® wireless connection (optional). Both connections
can be used to configure the instrument before process integration. After process integration, both connections can also be
used to monitor the instrument without disconnecting the communication connection.
Note: All information in this document regarding the Bluetooth® functionality of the FLEXI-FLOW™ does not apply to
instruments ordered without this functionality.
1.4.2 Instrument status (NAMUR)
With the status indication light , the FLEXI-FLOW™ Compact shows its current status , using a color range based on
the NAMUR NE 107 standard. The colors provide easily recognizable signals to the operator regarding corrective actions,
malfunctions, maintenance indications, etc.
Comprehensivediagnostic informationbased ontheNAMUR statusis available in FlowSuite.
1.4.3 Multi-parameter functionality
The FLEXI-FLOW™ Compact works in much the same way as any regular digital Bronkhorst® instrument. Upon delivery, the
FLEXI-FLOW™ Compact is configured as a (mass) flow controller or meter. An integrated temperature sensor and 2 pressure
sensors provide additional real-time measurement data, allowing the main instrument function to be switched between
flow control and pressure control .
1.4.4 On-board FLUIDAT® database
A built-in database with properties of 22 commonly used gases provides the basis for up to 8 fluid presets, which can be
stored in the instrument using FlowSuite or by direct digital communication (e.g. using a custom-built (PLC) program).
The on-board FLUIDAT® conversion algorithm continuously adjusts the gas flow relative to the calibration gas, based on
the measured temperature and pressure and the properties of the selected gas (or mixture) .
1.4.5 Multi-modular systems
The FLEXI-FLOW™ Compact can be supplied as a system with up to 8 instruments which are linked fluidically by means of a
manifold-like construction. The instruments can be controlled individually on FLOW-BUS or Modbus, or through a
gateway in other fieldbus systems. The gateway and the instruments behind it are powered through a single cable.
For informationabout FLEXI-FLOW™ Compact basedmulti-channel systemsandpossibleapplications, contact your
Bronkhorst representative.
7 14
17
15
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Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact9.17.158D 9
1.5 Documentation
· This document containsbasic information for installation, commissioning andmaintenance of the
FLEXI-FLOW™ Compact.
· At somepointsit refersto documentationassociated withimportant componentsor features.
Thesereferencesarelistedin thetablebelow.
· All documents listedhere can befound ontheFLEXI-FLOW™ product page
(www.bronkhorst.com/flexi-flowor scantheQRcode).
Type
Document name
Document no.
Manuals
Instruction Manual FLEXI-FLOW™ Compact
(this document)
9.17.158
Quick Start Guide FLEXI-FLOW™ Compact
9.17.157
Instruction Manual FLOW-BUS interface
9.17.024
Instruction Manual Modbus interface
9.17.035
Instruction Manual RS-232 interface*
9.17.027
Technical documentation
Datasheet (technical specifications)
Hook-up diagram Modbus RTU / FLOW-BUS
9.16.275
Dimensional drawing
7.15.225
Compliance
EU Declaration of Conformity FLEXI-FLOW™
9.06.132
EU Declaration of Conformity RoHS
9.06.124
Manufacturer Declaration REACH
9.06.056
Manufacturer Declaration WEEE
9.06.128
Conflict Minerals Compliance Policy
9.06.065
*) Note that the FLEXI-FLOW™ has no RS-232 communication interface. In this context, the reference to this manual is only to
provide information about the ProPar protocol.

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact 9.17.158D10
1.6 Safety notes
Please read this document entirely and carefully before installing and operating the product. Not following
the guidelines could result in personal injury and damage to the product and the system(s) it is incorporated in
orconnected with.
· Theproduct(s)described inthisdocument mayonlybehandledbyqualified personnel whoarefamiliar with combined
fluid and electrical systemsandwho recognizetheassociatedhazards(e.g. (high)fluid pressure, electric shock).
· Theuser isresponsiblefor takingthenecessarysafetymeasuresto prevent damage and/or injurywhile workingwith the
equipment andprocessmedia (asdescribed intheassociatedMaterial SafetyData Sheets).
· Whereappropriate, thisdocument recommendsor prescribessafetymeasures to betakenwith respect tomediaor
equipment usageunder thespecifiedconditions. However, thisdoesnot relievetheuser ofaforementioned
responsibility, not evenifsuch isnot explicitlyrecommended or prescribedinthisdocument.
· Theequipment andits accessoriesmust beusedinaccordancewith their specificationsandintended use.
· Thecustomer isresponsiblefor conductinga riskanalysisfor theentiresystem and taketherequired safetyprecautions
followingapplicablelaws and regulations. Basedontheriskanalysis, thecustomer should describeandadhereto
standardoperatingprocedures to ensure safeuseoftheequipment.
· Individual instrumentsmaynot bedisassembledor modifiedin any wayor for anypurpose.
· Anyunauthorizedmodification, for any purposewhatsoever, will be consideredasunintended andimproper use ,
will void warranty and cancel themanufacturer'sliability.
· Unauthorizedmodifications canundosafetyfeatures, compromisesystem specifications(suchasingressprotection
rating)andcausefailuretocomply withapplicablelaws, regulationsand directives.
· If theproduct isdefectiveor otherwisedoesnot meet your requirements, pleasecontact your Bronkhorst representative
for assistanceor advice.
Productrelatedsafety warnings
BeforeoperatingtheFLEXI-FLOW™, makesurethat the equipment hasbeeninstalledandconfiguredbyanauthorized
engineer andthat theinstallationisapprovedfor use.
To ensureand maintaina safeworkingarea, regularly inspect electrical andfluidlinesandconnections:
· Prior toeachuse, checkcablingfor proper connection, damage and wear. If necessary, replacecablesand/or connectors.
· Before, duringand after operation, checkfluidlinesandconnectionsfor leaks, damageandwear. Re-tightenfluid
connectionsasnecessary, replaceconnectorsasneeded.
During operation, fluid connectionsmaynot beloosened or disconnected under anycircumstances.
Whenpressurizing, prevent pressureshocksbygradually bringingthefluidsystem to therequiredoperating pressure.
Bronkhorst does theutmost toensurethat you receive aclean product. Thisdoesnot, however, relievetheuser ofthe
responsibility toensurethat theequipment andthesystem inwhichit isincorporatedmeet therequirementsimpliedby
theintendeduseoftheproduct. Theresponsibilityfor cleaningtheequipment tomeet suchrequirementsliesexclusively
withthe user.
· Dependingonthepropertiesof the processmedium and the(expected)timeuntil thenext use, it isadvisable to flushthe
fluid system withasuitable(cleaning) fluid after use.
· If theequipment hasbeenusedtoprocesscorrosive, reactiveor hazardousmedia(e.g. toxic or flammable), cleaning the
fluid system isimperativebefore it isexposedtoair.
· If theequipment isnot usedfor anextendedperiod, thefluidsystem shouldbedryafter useand after cleaning. Ifnot, it
shouldbepurgedwith adry, inert gasfor a minimum period of 30 minutes.
· Prior topoweringdown the FLEXI-FLOW™, thefluid system should bedepressurized.
· Whendepressurizing, prevent pressureshocksbyshuttingoffthefluid supplygradually.
Inexpertly servicinginstrumentscanlead toseriouspersonal injuryand/or damage totheinstrument or thesystem it is
usedin. Servicingmust thereforebeperformedbytrained and qualifiedpersonnel. Contact your Bronkhorst representative
for informationabout cleaningand calibration. Bronkhorst hastrained staffavailable.
· Beforedisconnectingor disassemblingany fluid system relatedparts, alwaysmakesurethe fluid system isdepressurized
to atmospheric pressure.
· Whendepressurizing, prevent suddenpressurechangesbyshuttingoffthefluidsupply gradually.
7

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact9.17.158D 11
2 Installation
2.1 Product specifications
Before installing the FLEXI-FLOW™, check that the functional and technical properties of the
product match your requirements (the image on the right is an example; it does not necessarily
reflect the actual specifications of your instrument).
If you have a question about the product or if you find the product does not meet the
specifications as ordered, do not hesitate to contact your Bronkhorst representative (see the first
pages of this document for contact information).
2.1.1 Pressure rating
A redlabel signifiesthat theFLEXI-FLOW™hasundergonea pressuretest and atest for outboard
leakage.
· If theredlabel ismissing, thedevicemust not beused and shouldbereturnedto thefactory.
· Beforeinstallation, makesurethat thepressureratingiswithinthelimitsofthenormal processconditions ofyour
application.
2.1.2 Bluetooth certification
Connectivity
Bluetooth version
5.2
Frequency range
2402…2480 MHz
Transmitter power
max. +6 dBm
Range
max. 75 m
FCC (USA): YCP-STM32WB5M001
Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio frequency
energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at his own expense.
ISED(Canada): 8976A-STM32WB5M01
Notes: This device contains licence-exempt transmitter(s)/receiver(s) that comply with Innovation, Science and Economic
Development Canada’s licence-exempt RSS(s). Operation is subject to the following two conditions:
1. This device may not cause interference.
2. This device must accept any interference, including interference that may cause undesired operation of the device.
JRF (Japan): 005-102490
NCC (Taiwan): CCAN20LP0740T3
2.2 Mounting
For optimal performance, observe thefollowingguidelines:
· Avoidinstallationincloseproximityofmechanical vibrationand/or heat sources.
· Usetheequipment inanenvironment with astableambient pressureand
temperature.
· For stablefixationtoa rigid andstable surfaceor construction, usethethreaded
mountingholesin thebottom oftheinstrument base. Consult thedimensional
drawing for theexact sizeandlocations.
9

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact 9.17.158D12
2.2.1 Piping requirements
· For reliableperformance, makesurethefluid stream isuncontaminated. If necessary, useaninlet filter to ensurea
particle freemediastream. Select a filter with amaximum poresize of20 µm and asurfaceareathat minimizesthe
pressuredrop.
· If backflowcould occur, theuse ofacheckvalve isalsorecommended.
Usepipingor tubingthat issuitablefor theoperatingconditionsoftheapplication(media, maximum temperature,
maximum operatingpressure).
2.2.2 Fluid connection
· If applicable: install the fluid connections according to the manufacturer's instructions.
· Connect the FLEXI-FLOW™ to the fluid system in accordance with the product overview .
· Tighten fluid connections according to the instructions of the manufacturer of the fittings.
· Make sure connector sizes match; do not mix metric (mm) and imperial (inch) sizes.
· Make sure all connectors and tubing are free from dirt and debris.
Do not applyfluidpressureuntil all required fluidconnections and electrical connectionshavebeen made.
Checkthefluidsystem for leaktightnessafter anymodificationand beforeapplyingfull operating pressure, especially when
usinghazardousmedia (e.g. toxic or flammable).
2.2.3 Preventing pressure shocks
FLEXI-FLOW™ instrumentscanhandlepressureshocks in thesystem well, but arenot insensitivetopressurefluctuations.
For optimal control stability, observethefollowingguidelines:
· Provideastable (pressurecontrolled)upstream pressure; put sufficient buffer volumebetween apressureregulator and
theinstrument. Asaruleofthumb, install pressureregulatorsat adistanceofat least 25 timesthepipediameter from
theinlet or outlet oftheinstrument.
· Whenusingmultipleinstrumentsand/or control valves, prevent interferencebyputtingpipingwithsufficient buffer
volume betweencomponents.
2.3 Electrical connection
· Electrical connections should be made according to the hook-up diagram , using the supplied cables (insofar as
included) or compatible, with respect to required supply current, voltage loss, cable length, cable and gland diameters
and operating conditions.
· When using self-assembled cables, follow the guidelines provided by the connectors' manufacturer.
· For use in a fieldbus system, follow the instructions of the cable supplier for the according fieldbus system.
· Make sure that the power supply matches the power rating of the instrument (see technical specifications ) and that
double or reinforced insulation is used for the power supply.
· If a surge protection device is used, make sure its specifications match the power consumption of the application.
To prevent damage asaresult ofreversedpolarity, theuseofa2A fuseinthedirect +Us lineisrecommended.
Alwaysturnoff electrical power beforeconnectingor disconnectingequipment electrically.
Inorder to beable to complywith all applicableguidelinesandregulations, it isessential that electrical connectionsbe
madebyor under supervisionofa qualified electrician.
· Theequipment described inthisdocument containselectronic componentsthat aresusceptibletoelectrostatic
discharge.
· Whenworkingonthe electrical installation, takeappropriatemeasuresto prevent damageasaresult ofelectrostatic
discharge.
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9
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Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact9.17.158D 13
TheCEmark ontheequipment indicatesthat it complieswith requirementsimposed by the EuropeanUnion, including
electromagneticcompatibility (EMC).
EMC canonly beguaranteed by applying appropriatecablesand connectorsor gland assemblies:
· Cablewirediametersmust besufficient tocarry the supplycurrent and minimize voltageloss.
· Whenconnectingtheproduct to other devices, ensure that theintegrityoftheshieldingremainsuncompromised; use
shieldedcablesandconnectorswherepossible and/or required.
· Preferably usethesuppliedcables(ifapplicable)tomakeelectrical (signal)connectionsto andbetween thesupplied
components. Thesecablesareshielded, havetherequiredwire diameter, andloose ends(if applicable)aremarkedto
facilitatecorrect connection.
If not all requirementsfor proper shieldingcanbemet (for example, becauseacomponent isnot equippedwith shielded
connectors), takethe followingmeasurestoensurethe best possible shielding:
· Keepcablelengthsat aminimum.
· Routecablesasclosely aspossiblealongsidemetal structuresor components.
· Ensureall electrical componentsaregrounded toearth.
Whenin doubt about the shielding of your cablingand/or electrical connections, contact your Bronkhorst representative.
2.4 Fieldbusconnection
The power connector also provides the selected fieldbus interface (FLOW-BUS or Modbus RTU).
Alwayscheckthetotal power consumptionofyour instruments beforeconnectingthem toa fieldbussystem. Donot exceed
themaximum power ofthepower supplyunit.
· For fieldbusrelatedwiringdetails, consult theaccordinghook-updiagram .
· For informationabout settingupa fieldbusnetworkwithBronkhorst® instruments, consult theaccordingfieldbus
manual .
· If you needassistancewithsettingupafieldbusnetwork, contactyour Bronkhorst representativefor information.
9
9

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact 9.17.158D14
3 Operation
3.1 General procedures
BeforeoperatingtheFLEXI-FLOW™, makesurethat the equipment hasbeeninstalledandconfiguredbyanauthorized
engineer andthat theinstallationisapprovedfor use.
To ensureand maintaina safeworkingarea, regularly inspect electrical andfluidlinesandconnections:
· Prior toeachuse, checkcablingfor proper connection, damage and wear. If necessary, replacecablesand/or connectors.
· Before, duringand after operation, checkfluidlinesandconnectionsfor leaks, damageandwear. Re-tightenfluid
connectionsasnecessary, replaceconnectorsasneeded.
During operation, fluid connectionsmaynot beloosened or disconnected under anycircumstances.
Gascondensationintheinstrument canseriously affect itsperformanceand reliability.
· If possible, ensurethat theambient temperatureisstableand at least equal to thetemperatureoftheprocessgas.
· Alwaysuseacleanand dryprocessgas (preferablywith apurityofat least 99.5 %).
3.1.1 Powering up
To maintaincontrol ofthefluidsystem and ensurea safe situation, it isrecommended toturnonpower beforeapplying
fluid pressureand toswitchoffpower only after thefluidsystem isdepressurized.
Whenpressurizing, prevent pressureshocksbygradually bringingthefluidsystem to therequiredoperating pressure.
· When powering up, the instrument needs a couple of seconds to start up the electronics and perform a self-test.
· During initialization, the indication light cycles through all NAMUR status colors .
· After successful initialization, the indication light lights up green to indicate that the instrument is ready to be used.
3.1.2 First use
Bronkhorst does theutmost toensurethat you receive aclean product. Thisdoesnot, however, relievetheuser ofthe
responsibility toensurethat theequipment andthesystem inwhichit isincorporatedmeet therequirementsimpliedby
theintendeduseoftheproduct. Theresponsibilityfor cleaningtheequipment tomeet suchrequirementsliesexclusively
withthe user.
3.1.3 After use
· Dependingonthepropertiesof the processmedium and the(expected)timeuntil thenext use, it isadvisable to flushthe
fluid system withasuitable(cleaning) fluid after use.
· If theequipment hasbeenusedtoprocesscorrosive, reactiveor hazardousmedia(e.g. toxic or flammable), cleaning the
fluid system isimperativebefore it isexposedtoair.
· If theequipment isnot usedfor anextendedperiod, thefluidsystem shouldbedryafter useand after cleaning. Ifnot, it
shouldbepurgedwith adry, inert gasfor a minimum period of 30 minutes.
3.1.4 Powering down
· Prior topoweringdown the FLEXI-FLOW™, thefluid system should bedepressurized.
· Whendepressurizing, prevent pressureshocksbyshuttingoffthefluid supplygradually.
3.1.5 Instrument status
The status indication light uses different colors to reflect the current status of the instrument:
Green
Normal operation
Red
Failure
Yellow
Out of specification
Blue
Maintenance required
Orange
Check function
8
7

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact9.17.158D 15
· The colors are based on the NAMUR NE 107 standard and are a simplified representation of the instrument's diagnostic
data .
· After powering up or restarting the instrument, the indication light cycles through all status colors once.
· After the startup cycle, the indication lights assumes the color associated with the current instrument status.
Bluetooth
· When Bluetooth is active, the indication light flashes blue once every 3 seconds.
· If the instrument has a Bluetooth connection, the indication light flashes blue twice every 3 seconds.
· Bluetooth communication is not reflected by the indication light.
· Bluetooth indications are not related to the blue NAMUR indication.
Zeroing
· During zero point adjustment , the indication light blinks blue (1 second on, 1 second off).
· The zeroing indication is not related to the blue NAMUR indication.
3.2 Special procedures
3.2.1 Changing communication settings
Communication interface (power and signal connector)
· Unless specified otherwise at ordering time, the power and signal connector is configured for Modbus RTU
communication upon delivery.
· If necessary, use the support interface or a Bluetooth wireless connection to change the communication settings.
· Because selection of the active communication interface is effective immediately, communication will be cut off if the
selected interface is changed while communicating through the power and signal connector.
· Preferably use FlowSuite to select the required communication interface and associated parameters (fieldbus address,
baud rate, parity).
· Alternatively, use a ProPar-enabled software tool like FlowDDE (support interface only).
· See parameter section Network configuration for digital parameter settings and default values.
· A USB connectiononthesupport interfaceprovidessufficient power for instrument configurationonly.
· ConfigurationusingaBluetoothwirelessconnectionrequirespoweringtheinstrument throughthepower connector or
support interface.
Manualaddressselection
Assuming the default baud rate and parity match the fieldbus configuration, the fieldbus address can be quickly set using
the manual address selector :
· With value 0, the instrument uses the digital address setting
· Values from 1 to 9 override the digital setting
3.2.2 Fluid selection
Fluid sets or mixtures can be stored using FlowSuite or by direct digital communication (e.g. using a custom-built (PLC)
program). To define a fluid set or mixture, only the formula of the required gas needs to be entered in the appropriate
parameter. The associated conversion parameters are filled in automatically.
Whether carried out in FlowSuite or with direct digital communication, fluid and mixture definition are virtually identical:
To define a fluid set:
1. Select the required FluidSet Index.
2. Enter the formula of the required gas into parameter FluidName (case-sensitive).
20
18
30
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Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact 9.17.158D16
To define a mix component:
1. Select the required FluidSet Index.
2. Select the required Mix Component Index.
3. Enter the formula of the required gas into parameter Mix Component FluidName (case-sensitive).
The following gases can be selected:
Name
Formula
Acetylene
C2H2
Air
Air
Allene
C3H4 #1
Argon
Ar
Carbon dioxide
CO2
Carbon monoxide
CO
Cyclopropane
C3H6 #1
Deuterium
D2 #1
Ethane
C2H6
Ethylene
C2H4
Helium
He
Hydrogen
H2
Krypton
Kr
Methane
CH4
Neon
Ne
Nitrogen
N2
Nitrous oxide
N2O
Oxygen
O2
Perfluoropropane
C3F8
Propane
C3H8
Propylene
C3H6 #2
Propyne
C3H4 #2
· Notethat theFLUIDAT® algorithm iscase-sensitiveregardingfluid names.
· If you needdefinitionsfor other gases, contact your Bronkhorst representative.
· Alsoseeparameter sectionFluid set for acompletereferenceofall digital fluid set parameters.
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Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact9.17.158D 17
3.2.3 Switching control function
Bronkhorst® softwareautomatically adds additional communicationchannelstothearrayasregular instruments.
Controlfunctions
The multi-parameter functionality enables simultaneous measurement of flow, upstream pressure and downstream
pressure, using 3 different communication channels. The selected control function determines whether the instrument uses
1 or 2 communication channels/sensors for measurement and control.
Singlechannel control
Using the single channel control functionality, only a single sensor is used:
Control
Function
param.
Communication
channel
Instrument function
0
F
Flow control
1
P1
Upstream pressure control
2
P2
Downstream pressure
control
Dualchannel control
Using the dual channel control functionality, a combination of the flow sensor and 1 of the pressure sensors is used, where
either the flow is controlled and the pressure is limited, or vice-versa:
Control
Function
param.
Communication
channel
Instrument function
3
F + P1
Flow control, with
upstream pressure limit
4
F + P2
Flow control, with
downstream pressure limit
5
P1 + F
Upstream pressure control,
with flow limit
6
P2 + F
Downstream pressure
control, with flow limit

Bronkhorst®
Instruction Manual FLEXI-FLOW™ Compact 9.17.158D18
Switching the control function
· Use parameter Control Function to set the instrument function.
· Give a setpoint to the controlled value.
· If dual channel control is selected: give a limit to the limited value, using the setpoint parameter of that communication
channel.
· See section Multi-parameter addressing for available parameters.
3.2.4 Bluetooth configuration
· The FLEXI-FLOW™ Compact is delivered with Bluetooth disabled.
· Bluetooth can be enabled using FlowSuite.
· When pairing, the instrument can be recognized by its serial number.
· The first time the instrument is paired with FlowSuite, a six-digit passkey must be created.
· Subsequently, the instrument can only be paired by entering the passkey that is stored in the instrument.
· After pairingtheinstrument, Bluetoothcanalso be enabledor disabled by usingdigital communication. Seeparameter
sectionBluetooth for theaccordingparameters.
· ConfigurationusingaBluetoothwirelessconnectionrequirespoweringtheinstrument throughthepower connector or
support interface.
3.2.5 Adjusting zero point
Zero-stability
The zero point of a Bronkhorst® flow meter/controller (the measurement signal that indicates the absence of a flow) is
factory adjusted at approximately 20 °C and atmospheric pressure (ambient conditions), with the instrument positioned
upright. Under normal circumstances (i.e. at stable process conditions), the zero point will remain stable. However, over time
several factors can induce a slight deviation of the measured value from the zero point, causing the instrument to detect a
flow when in reality there is none. Readjusting the zero point eliminates this deviation.
· After installationor relocation, alwayscheckthezeropoint.
· If theinstrument still detectsa (steady)flowwhile all valvesareclosedandthefluid system isleaktight, adjustingthe
zero point isrecommended.
Prerequisites
Zeroing an instrument requires that:
· the ambient conditions (temperature, pressure) match those of the operating environment of the instrument.
· the instrument is filled homogeneously and pressurized with the operational media, according to the typical process
conditions.
· the instrument has been warmed up sufficiently.
· there is absolutely no flow through the instrument; preferably, this is achieved by closing a valve immediately after the
outlet of the instrument (control valve, shut-off valve).
Blockingthe flowthroughtheinstrument isessential; zeroing an instrument whilethere isstill a flowwill leadto
measurement errors.
Procedure
FlowSuiteprovidesaquickandeasywayto adjust thezeropoint of aninstrument; theAutozero functionautomatically
performstheproceduredescribed here.
To adjust the zero point using digital communication, set parameter values in the following sequence (see section
Parameters for more information about instrument parameters):
Sequence#
Parameter
Value
Action
1
Setpoint or fSetpoint
0
stop flow
2
Init Reset
64
unlock secured parameters
3
Control Mode
9
enable calibration mode
4
Calibration Mode
0
reset calibration mode
5
Calibration Mode
9
start zeroing
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The status indication light starts blinking blue (1 second on, 1 second off), indicating that the procedure is in progress.
On completion, the indication light assumes the color of the current instrument status .
If the procedure is successful, parameter CalibrationMode changes to 0 (idle). If the procedure fails, CalibrationMode changes
to 255.
After zeroing, parameter Control Mode returns to its initial value. The output signal should be 0 % (parameter Measure = 0).
After performingtheprocedure, remember to set parameter Init Reset to value82 to locksecuredparameters.
3.3 Maintenance
Inexpertly servicinginstrumentscanlead toseriouspersonal injuryand/or damage totheinstrument or thesystem it is
usedin. Servicingmust thereforebeperformedbytrained and qualifiedpersonnel. Contact your Bronkhorst representative
for informationabout cleaningand calibration. Bronkhorst hastrained staffavailable.
The FLEXI-FLOW™ needs no regular maintenance if operated properly, with clean, non-corrosive media, compatible with the
wetted materials, avoiding pressure and thermal shocks and vibrations.
· Beforedisconnectingor disassemblingany fluid system relatedparts, alwaysmakesurethe fluid system isdepressurized
to atmospheric pressure.
· Whendepressurizing, prevent suddenpressurechangesbyshuttingoffthefluidsupply gradually.
3.3.1 Cleaning
Fluidpath
· The instrument's fluid path (the wetted parts) may be purged with a clean, dry and inert gas.
· In case of severe contamination, cleaning the wetted parts may be necessary. This requires the instrument to be returned
to the factory.
Exterior parts
Exterior parts can be cleaned with a soft, lint free cloth, preferably dry, or, if necessary, moistened with a mild water soluble
cleaning agent.
· Moistentheclothonlyslightly, to prevent liquidpenetratingtheinterior andcausing damageto theelectrical parts.
· Only useawater solublecleaningagent, never anoil basedliquid likepaint thinner or whitespirit, asthesemight
damageparts madeofsynthetic materials.
3.3.2 Calibration
The FLEXI-FLOW™ has been factory calibrated. Periodical inspection, recalibration or verification of the accuracy may be
subject to individual requirements of the user. Whenever necessary, contact your Bronkhorst representative for information
and/or making arrangements for recalibration.
Bronkhorst certifies that the instrument meets the rated accuracy. Calibration has been performed using measurement
standards traceable to the Dutch Metrology Institute (VSL).
3.4 Troubleshooting
Generalproblems
· Electronic problems can betraced byrestartingthe equipment.
· If theequipment startsupnormally, the measurement andcontrol behavior canbecheckedbyapplyingfluidpressure.
· To trackdownproblemsinthefluid system, depressurizethefluid system anddisconnect thesuspected unit from the
processline. Dirt or cloggingmight bequicklydetectedbyvisual inspectionofdisassembledfluidconnections.
If you suspect leakage, donot disassemblethedevicefor inspection, but contact your Bronkhorst representativefor service
or repairs.
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3.4.1 Zooming in on NAMUR status
Errors andwarnings
· Detailederror andwarninginformationcanbefoundbyconnectingtheinstrument toaWindowscomputer running
FlowSuite. FlowSuite'sdiagnostic function makescomprehensive diagnostic informationaccessible based on the
NAMUR status .
· Thebuilt-in diagnostic instrument parameters whichFlowSuite usesfor thispurpose arealsoavailablethroughthe
digital communicationinterface.
3.4.2 Default valve state
When a controlling instrument is not powered or cannot communicate with the fieldbus network (if applicable), all electrical
valves operated by the instrument (whether integrated or external) automatically return to their default state. The default
state is closed for 'normally closed' valves (n/c) and fully open for 'normally open' valves (n/o).
Check the serial number label or the technical specifications to see which valve type is used on your instrument (if
applicable).
3.4.3 Common issues
Symptom
Possible cause
Corrective action
No communication
No power supply
· Check power supply
· Check cable connection
· Check cable hook-up
Invalid node address
Change node address (see Changing
communication settings )
Invalid baud rate
Make sure instrument baud rate matches
master/application baud rate
Other
Reset instrument and/or restart master. If
problem persists, contact your Bronkhorst
representative
No output signal
No power supply
· Check power supply
· Check cable connection
· Check cable hook-up
Invalid control mode (instrument
accepts no setpoint)
Check control mode (see Special parameters
)
Valve(s) in default state (normally
closed)
Check if connected valves are in default state;
solve cause if necessary (see Default valve
state )
Upstream pressure or differential
pressure too low
Increase upstream pressure
Piping, filters and/or control valve
clogged or blocked
Clean fluid system (flush with clean, dry air)
Sensor failure
Contact your Bronkhorst representative
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