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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Phone: + 8621 5879 8521 Fax: [phone]

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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.

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Installation: Installing into Duct or pipe
Installation Depth of the 640S in the Duct
If you don’t know the flow profile or you are not familiar on how to determine the flow profile,there
is a basic rule on how to setthe depth of the 640S meters in the duct.
Be aware that this might not be the most accurate way for your application, knowing the
flow profile and install according to that profile is preferred
Divide the duct in four equal quadrants. Insert the middle of the sensors of the probe to 0.15 x
D(D=diameterofthe duct)intotheduct.Makesurethattheprobesareturned90ºfromeach
other. Seepicturebelow.
AlthoughaMulti-Trak™ theoreticallycompensatesfordistortedflowprofilesitis
recommendedthatthere be as much straight lengthof pipe possible beforethe
measurement point .

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CHAPTER 4: SETTING UP THE MENU
Follow these screen shots tp set up the Multi-Trak™
1)
After power up the HMI initialize the system, this will take
about 12 seconds. No action required.
2)
After power up, the MultiPoint Menu will appear. Begin
setup of the Multi-Trak™. This is done by pressing the
“settings”button.
3)
First, press the “units” button to setup units. Here the user
can also convert to other units.
The original units of the meter are shown in the upper right corner. In this example they are
normal meters per second (nmps). Press the square box before the unit which you want to
convert to, or if you don’t want to convert the unit press the same unit. After pressing the square
box your choice will be set by a cross. Press “next”button to proceed. In our example we have
changed from NMPS to SFPH. NOTE: All Multi-Trak™ meters start with a VELOCITY reading.
Later steps will convert this into mass flow units like lbs/hr or SLPM if desired.
4)
Press the “pipe ID“button in the settings menu to setup the
pipe diameter. This is not required if the user only want the
velocity average.
5)
Press the “Density”button in the settings menu to setup the
Density of the gas. It is also required to fill in if the density
is under normal or standard conditions; this is done by
pressing the square box. The density is only required if you
use the real mass average.

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6)
By pushing the “alarm”button in the settings menu the user
can setup the alarm limits. If one of the 640S meters is out
of the specified limits an alarm is enabled. The user can
see a LOW or HIGH alarm. AN ALARM CONDITION
TAKES THE METER OUT OF THE GRAND AVERAGE.
You can turn the unit on again in the average menu. Note that these additions or subtractions
from the baseline. The assumed baseline is 100% of the AVERAGE FLOW. In this example for
the high alarm the limit is entered as 50%. This means that the high alarm limit is set to 150% of
the AVERAGE FLOW. For the low alarm it needs to be subtracted from 100%. In this example for
the low alarm limit is entered 50% means that the low alarm limit is set to 50% of the AVERAGE
FLOW. So you can see that if a single meter suddenly began to read less than half or more than
1.5 times the average flow (in this particular example), there is assumed to be a fault with that
point and it is removed from the grand average.
There is also the possibility to set a delay, in seconds. When a meter is out of range a timer will
start and if the flow recovers within this time the alarm will not go off.
By pressing the “contribution”button in the alarm limits
screen, the user can see what every meter measures in %
of the average flow.
f.i: Unit 1, 2, 3 measures 10 NLPM and Unit 4 measures 9,2 NLPM. This is an average of
39.2 / 4 = 9.8 NLMP. So unit 1, 2, 3 measures 102% and unit 4 measures 94%.
7)
By pushing the “average”button in the settings menu the
user can setup which meters will count for the averaging.
The user can turn meters on and off for the averaging by
toggling the On/Off button below the corresponding
number. By pushing the “factor”button you can give every
meter a multiplication factor. Also you can give the whole average a multiplication factor. Default
for every multiplication factor is 1.00
XtotAverage 4Flow4X4Flow3X3Flow2X2Flow1X1
Xstands for the multiplication factor.

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8)
By pushing the “output”button in the settings menu the user
can setup the 4-20mA output (the grand-average output). The
output can be forced to 4 or 20 ma for testing by pressing 4 or
20 mA below Force. By pressing 4 or 20mA the output is
forced to go to 4 or 20mA. The user is free to setup the output
within the FFS of unit 1. In this screenshot the FFS of unit 1 is 12.5, but for UFS is 3.00 entered.
Now at a flow of 3.00 the output is 20mA. The output is always 4mA if there is no flow. The output
is the average flow.
9) Once the user has setup the Multi-Trak™ to his requirements he can go back to the MultiPoint
menu and choose velocity or Mass, with mass you can choose normalized/standardized or real
mass flow.
Information on the screen:
1, 2, 3, 4 stands for the corresponding Model 640S Flow Meter. You can see the individual flow
for each point Flow and the grand average flow with units.
By pressing the big button the user can see the average flow on one screen.

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Advanced Menu
With the advanced menu, here the user can see all the parameters for the individual
640S meters. The user can enter this menu by pressing the “advanced”button in the
settings menu.
10)
In the advanced menu the user can choose the unit he
wants to see. By pressing the “All” button the user can see
all four 640S meters.
If the “All” button is pressed the user will see the flow and
the original units for all four 640S meters.
NOTE: The units (example nmps) are the units in which
the meters are original calibrated. This has nothing to do
with the unit conversion in the Settings menu of the Multi-
Trak™
By pressing a unit in the advanced menu the user will see
all the parameters of the individual meter. The parameters
are Tag and Serial number, flow, totalizer, UFS and K-
factor. By pressing the “Settings” button the user can
change some settings.
The user can reset the totalizer by pressing
the “Reset” button and confirm with the “Yes”
button.
The user can change the k-factor by
pressing the “Adjust” button behind the k-
factor number. A screen will appear where
the user can change the k-factor and
confirm.
NOTE: Entering a k-factor adjusts the meters output signal without affecting the factory calibration curve.
Use the k-factor calibration offset for additional flow profile compensation (the factory includes an initial
flow profile correction in the calibration curve of the unit). If in doubt, read the manual “Sierra Series 640S
Flow Meter”. The user can change the UFS by
pressing the “Adjust” button behind
the User full scale number. A
screen will appear where the user
can change the User full scale and
confirm.

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NOTE: User Full Scale Flow Rate may be Field-configured from 50% to 100% of the factory full
scale setting (factory full scale is normally set to 125% of the user-specified maximum flow rate).
This adjustment can be made for each flow range. If in doubt read the manual “Sierra Series 640
Flow Meter”.
The settings screen also shows the last calibration date and the Factory
Full Scale. Those are not changeable.

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CHAPTER 5: TECHNICAL SUPPORT & SERVICE
Technical Support
If you encounter any problem with your instrument, review the configuration information for each step of
the installation, operation, and set up procedures as explained in this manual. Verify that your settings
and adjustments are consistent with factory recommendations.
If the problem persists, Sierra Instruments is eager to help you. You may contact us at the following
Technical Support Center. It may also help to call your Sierra Instruments Sales Agent, who is also well
trained in the operation of the product.
IMPORTANT: When contacting Technical Support, make sure you have included the
following information:
- The type of Multi-Trak™, serial number (all marked on the instrument data label).
- The problem you are encountering and any corrective action taken.
CUSTOMER SERVICE AND SUPPORT INFORMATION
Email Technical Support: [e-mail]
Email Sales: [e-mail]
FACTORY USA:
TOLL FREE: 800-866-0200
PHONE: [phone]
FAX: [phone]
EMAIL: [e-mail]
European Sales & Service Center:
PHONE: [phone]
FAX: [phone]
EMAIL: [e-mail]
Asia Sales & Service Center:
PHONE: + 8221 5879 8521
FAX: [phone]
EMAIL: www.sierra-asia.com

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APPENDIX A: WARRANTY POLICY
LIMITED WARRANTY POLICY- REGISTER ONLINE
All Sierra products are warranted to be free from defects in material and workmanship and will be
repaired or replaced at no charge to Buyer, provided return or rejection of product is made within
a reasonable period but no longer than one (1) year for calibration and non-calibration defects,
from date of delivery. To assure warranty service, customers must register their products online
on Sierra’s website. Online registration of all of your Sierra products is required for our warranty
process. Register now at www.sierrainstruments.com/register.
LIFETIME LIMITED WARRANTY ON PATENTED DRYSENSE SENSOR TECHNOLOGY
In addition to Sierra’s standard one (1) year manufacturing warranty on all instruments produced,
Sierra also offers a lifetime warranty on all DrySense™ sensors standard with Sierra models
640S, 670S, 780S, 640i, and 780i instruments sold after January 1, 2010. This warranty does not
extend to the Model 620S, the BoilerTrak™, the HT (High Temperature) 640S/780S sensor or the
780S UHP (Ultra High Purity) sensors. Learn more about Sierra’s warranty policy at
www.sierrainstruments.com/warranty.