Sierra Multi-Trak 670S User manual

Multi-Trak™
Model 670S Multi-Point Mass Flow Meter System
INSTRUCTION MANUAL
IM-Multipoint
Revision: B, April 2015
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Sierra Instruments’ Instruction Manual Multi-Trak™ Model 670S
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IMPORTANT CUSTOMER NOTICE
Sierra Instruments, Inc. is not liable for any damage or personal injury, whatsoever, resulting from
the use of Sierra Instruments standard mass flow meters or controllers for oxygen gas. You are
responsible for determining if this mass flow meter or controller is appropriate for your oxygen
application. You are responsible for cleaning the mass flow meter or controller to the degree
required for your oxygen flow application.
© COPYRIGHT Sierra Instruments TRADEMARKS
No part of this publication may be copied or distributed, transmitted, transcribed, stored in a
retrieval system, or translated into any human or computer language, in any form or by any
means, electronic, mechanical, manual, or otherwise, or disclosed to third parties without the
express written permission of Sierra Instruments. The information contained in this manual is
subject to change without notice.
TRADEMARKS
Multi-Trak™, Mult-Trak System™, Dry-Sense™, and Steel-Mass™ are trademarks of Sierra
Instruments, Inc. Other product and company names listed in this manual are trademarks or trade
names of their respective manufacturers.

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Table of Contents
CHAPTER 1: INTRODUCTION .......................................................................................................4
Welcome to the Multi-Trak™....................................................................................................4
Safety Information.....................................................................................................................5
Receipt Of Your Instrument ......................................................................................................5
Definitions Used In This Manual...........................................................................................6
CHAPTER 2: INTRODUCTION TO THE MULTIPOINT ...................................................................7
CHAPTER 3: INSTALLATION .........................................................................................................8
Installation Guide.............................................................................................................9
Connecting Modbus Communication to Individual Model 640S Meters.......................9
Installation: Daisy Chaining the Units Together.....................................................10
Installation: Installing Into Duct Or Pipe ............................................................11
Installation Depth Of The 640S In The Duct ..............................................11
CHAPTER 4: SETTING UP THE MENU.........................................................................................12
Advanced Menu ...........................................................................................15
CHAPTER 5: TECHNICAL SUPPORT & SERVICE.......................................................................17
Technical Support ........................................................................................17
APPENDIX A: WARRANTY POLICY…………………………………………………..………………..18

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CHAPTER 1: INTRODUCTION
Welcome to the Multi-Trak™
Sierra's Multi-Trak™ Model 670S is an advanced state-of-the-art instrument for measuring
mass flow rates in very large ducts or stacks that have non-uniform velocity profiles, high
turn-down requirements, dirty gas streams, wide temperature ranges and fast velocity and
temperature changes. The Model 670S dynamically compensates for changes in the flow
profile by using up to four independent mass flow sensing points to measure the
instantaneous average gas mass flow velocity. The Multi-Trak™ is commonly used in
petrochemical refining, coal-fired electric power generation, steel manufacturing and many
other industrial processes that face the challenge of accurate and repeatable gas mass flow
measurement in very large pipes or ducts.
An innovative, versatile and user-friendly microprocessor-based Human Machine Interface
(HMI) controls all functions of the Multi-Trak™ system. The HMI is used to collect, visualize
and store flow data, as well as set up the individual sensor points, thus allowing the entire
system to be easily configured in the field. The Model 670S’HMI integrates the functions of
flow measurement, flow-range adjustment, field validation and diagnostics, and displays
mass flow rate and totalized flow, as well as other configuration variables. All of this data is
easily programmable from the HMI's easy-to-use touch screen.
Unlike single probe insertion sensors where each sensor point is on the same insertion
probe, each Model 670S sensor point is completely independent of the others, allowing for
easy field swap-out or cleaning of individual transmitters.
The Multi-Trak™ offers a variety of features for ease of operation.
Averages the flow of 2-4 meters
Convert units f.i. for NLPS to SLPH
Setup density of the gas for mass flow measurement
Setup of the individual meters
Easy setup of the HMI system
Alarm setup
Touch screen operated
And many more…visit www.sierrainstruments.com

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SAFETY INFORMATION
Caution and warning statements are used throughout this manual to draw your attention to
important information.
RECEIPT OF YOUR INSTRUMENT
When receiving the instrument, carefully check the outside packing carton for damage that may
have incurred during shipment. If the carton is damaged, notify the local carrier and submit a
report to the factory or distributor. Remove the packing slip and check that all ordered
components are present and match your specifications (as ordered). Do not return any equipment
to the factory without first contacting Technical Support Center.
Warning!
Caution!
This statement appears with information
that is important to protect people and
equipment from damage. Pay very close
attention to all warnings that apply to
your application.
This statement appears with information
that is important for protecting your
equipment and performance. Read and
follow all cautions that apply to your
application.

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DEFINITIONS USED IN THIS MANUAL
The following terms are used frequently in this manual. They are presented here with
their definitions for your information.
FFS = Factory full scale of the 640S meter
UFS = User full scale of the 640S meter
HMI = Human machine interface
Note: It is recommended to you read:
“Sierra Steel-Mass™ Model 640S Insertion Mass Flow Meter Instruction Manual.”

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CHAPTER 2: INTRODUCTION TO THE MULTIPOINT
The Multi-Trak™is used for bigger pipes to dynamically compensate for changes in the flow
profile due to changes in flow. The basic principle is that flow is measured at several locations in
the pipe, then those points are added together and divided by the number of points to get the
grand-average flow rate.
Multi-Trak™ consists of:
-4 x 640S meters with Modbus. (see Sierrainstruments.com for
-information about Model 640S meters)
-1 x Control box, with HMI and 4-20mA/0-5V output module.
-3 x cable’s (power, output 4-20mA/0-5V, cable for daisy chaining
-the 640S meters)
In the default mode the four models of the 640S are added together
and divided by four, but the operator can turn units On or Off.
For example, if one unit is turned off the average is divided by three.
Each unit and total average can have a multiplication factor
(the default is 1.00):
XtotAverage 4Flow4X4Flow3X3Flow2X2Flow1X1
Figure 1: Sierra Instruments’Multi-Trak™Demo

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CHAPTER 3: INSTALLATION
Wiring: The Multi-Trak™ requires 24VDC approximately 2A.
Figure 2: Wiring Ports on the HMI
All three connectors are different; they
are keyed differently to prevent
mistakes.
The middle connector is the 24 VDC
Power supply in.
The left connector is 4-20mA
output with the grand-average
flow rate. This is an active
output; do not apply loop
power.
The right connector is for
daisy chaining the 640
meters. This is a 4-wire daisy
chain: two wires for the power
supply and two wires for the
modbus communication.
Figure 3: Pinouts of the HMI
24VDC in
Output 4-20mA
24VDC out and Modbus A and B

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Installation Guide
DC Power Wiring Individual Model 640S Meters
The DC power wire size must be 18 to 19 AWG with the wire stripped 1/4 inch (6 mm). Connect to
the terminals marked (1) PWR+ and PWR(2)–on the terminal block. Torque all connections to
4.43 to 5.31 in-lbs (0.5 to 0.6 Nm).
All EEx installations must use an approved EEx fitting at both cable entries into the enclosure. If
conduit seals are used, they must be installed within 18 inches of the enclosure.
Figure 4: DC Power Wiring
Connecting Modbus Communication to Individual Model 640S Meters
After opening the enclosure, the modbus communication TB is visible on the right side.
Figure 5: Modbus Wiring
1

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Installation: Daisy Chaining the Units Together
Daisy chain the cable with the 4 x 640S meters as shown in the picture below and tighten the
cable glands:
Figure 6: Daisy Chaining of 640S Units
Make sure that the last 640S meter (#4) has a terminator
resistor between the yellow and green wire.
Daisy chain the modbus A and B for all four 640S meters to the connector of the HMI. The shield
of the cable can be connected to the connector pin called shield (See Figure 2) and to the
modbus communication print number 3 of the 3 way terminal.
The RS485 is an optical isolated interface. Don’t connect the RS485 shield to ground
of the power supply unless the isolated interface isn’t required.
NOTE: The communication cable can not be longer then 1200m.