Sierra BioTrak 645S User manual

Instruction Manual
Document: S-IM-645S/745S
Rev B_PN 109629
Thermal Mass Flow Meter for Biogases
BioTrak 645S/745S
831.373.0200 | 5 Harris Court Building L, Monterey, CA 93940 | sierrainstruments.com

| 2

Disclaimer
BioTrak 645S/745S
Disclaimer | 3
GLOBAL SUPPORT LOCATIONS: WE ARE HERE TO HELP!
For Global Service Centers, go to http://www.sierrainstruments.com/facilities.html
CORPORATE HEADQUARTERS
5 Harris Court, Building L Monterey, CA 93940
Phone [phone] [phone] Fax [phone]
[email protected]
www.sierrainstruments.com
EUROPE HEADQUARTERS
Bijlmansweid 2 1934RE Egmond aan den Hoef
The Netherlands
Phone [phone] Fax [phone]
[email protected]
ASIA HEADQUARTERS
Second Floor Building 5, Senpu Industrial Park
25 Hangdu Road Hangtou Town
Pu Dong New District, Shanghai, P.R. China
Postal Code 201316
Phone: + 8621 5879 8521 Fax: [phone]
© COPYRIGHT SIERRA INSTRUMENTS 2022
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
BioTrak™, BioCal™, BioSelect™, FlowTrak™, BioView™, and DigiSense™ are trademarks
of Sierra Instruments, Inc. Other product and company names listed in this manual are
trademarks or trade names of their respective manufacturers.

Disclaimer | 4
Disclaimer
BioTrak 645S/745S
Warnings and Cautions
General Safety Information
We use caution and warning statements throughout this book to draw your attention to
important information.
Symbol Key
Symbol Symbol Meaning Description
Warning
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.
Caution/Note
This statement appears with
information that is important
for protecting your equipment’s
performance. Read and follow
all cautions that apply to your
application.
• Warning! Agency approval for hazardous location installations varies between ow
meter models. Consult the ow meter nameplate for specic ow meter approvals
before any hazardous location installation.
• Warning! Hot tapping must be performed by a trained professional. U.S. regulations
often require a hot tap permit. The manufacturer of the hot tap equipment and/or the
contractor performing the hot tap is responsible for providing proof of such a permit
• Warning! All wiring procedures must be performed with the power O.
• Warning! To avoid potential electric shock, follow National Electric Code safety
practices or your local code when wiring this unit to a power source and to peripheral
devices. Failure to do so could result in injury or death. All AC power connections must
be in accordance with published CE directives.
WARNING

Disclaimer | 5
Disclaimer
BioTrak 645S/745S
• Warning! Before attempting any ow meter repair, verify that the line is de-pressurized.
• Warning! Always remove main power before disassembling any part of the mass ow meter.
CAUTION
• Caution! Before making adjustments to the Smart Electronics device, verify the ow meter
is not actively monitoring or reporting to any master control system. Adjustments to the
electronics will cause direct changes to ow control settings.
• Caution! All ow meter connections, isolation valves and ttings for hot tapping must have
the same or higher pressure rating as the main pipeline.
• Caution! The ow meter electronics and sensor probe have been manufactured and
calibrated to operate as a unit. The ow meter will not operate properly if parts are replaced
from another meter.
• Caution! Printed circuit boards are sensitive to electrostatic discharge. To avoid damaging
the board, follow these precautions to minimize the risk of damage:
- before handling the assembly, discharge your body by touching a grounded,
metal object
- handle all cards by their edges unless otherwise required
- when possible, use grounded electrostatic discharge wrist straps when handling sensitive
components

Disclaimer
BioTrak 645S/745S
Disclaimer | 6
Receipt of System Components
When receiving a Sierra mass ow meter, carefully check the outside packing carton for damage
incurred in 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.
Make sure any spare parts or accessories are not discarded with the packing material. Do not return
any equipment to the factory without rst contacting Sierra Customer Service.
Technical Assistance
If you encounter a problem with your ow meter, review the conguration information for each step
of the installation, operation, and setup procedures. Verify that your settings and adjustments are
consistent with factory recommendations. Installation and troubleshooting information can be found
in the Chapter 2 (Installation) and Chapter 6 (Troubleshooting) of this manual.
If the problem persists after following the troubleshooting procedures outlined in Chapter 6 of this
manual, contact Sierra Instruments by e-mail (see inside front cover). For urgent phone support you
may call [phone] between 8:00 a.m. and 5:00 p.m. PST. In Europe, contact Sierra Instruments
Europe at [phone]. In the Asia-Pacic region, contact Sierra Instruments Asia at [phone]
8521. When contacting Technical Support, make sure to include this information:
• The ow range, serial number, and Sierra order number (all marked on the meter nameplate)
• The software version (visible at start up)
• The problem you are encountering and any corrective action taken
• Application information (gas, pressure, temperature and piping conguration)
Using This Manual
This manual provides information needed to install and operate the Series BioTrak 645S/745S Mass
Flow Meter.
Additional Resources
Visit Sierrainstruments.com for additional resources. Note: the most current versions of the
645S/745S documents can be found at https://www.sierrainstruments.com/products/downloads.html.

BioTrak 645S/745S
Table of Contents | 7
Table of Contents
1. Introduction Pages 9-21
a. Quick Start Guide .........................................................................p. 9
b. Menu Trees ..............................................................................p. 11
c. General ................................................................................ p. 19
2. Installation (Mechanical) Pages 21-33
a. Lateral Placement........................................................................p. 23
b. Welding Branch Outlet to Pipe (Insertion) ...................................................p. 25
c. Installation Depth ........................................................................p. 26
d. Orientation..............................................................................p. 28
e. Mounting Instructions ....................................................................p. 27
f. Retractor Installation .......................................................................p. 31
3. Wiring (Electrical) Pages 34-43
a. Wiring Access ...........................................................................p. 35
b. Input Power .............................................................................p. 36
c. Signal Wiring and HART Communication Option .............................................p. 37
d. Pulse/Alarm Wiring (optional feature) .......................................................p. 40
e. RS485 Wiring: Modbus RTU ...............................................................p. 42
f. HART Handheld Wiring....................................................................p. 44
4. Operation (Standard Operation) Pages 45-68
a. Start Up ................................................................................p. 45
b. Programming............................................................................p. 48
c. BioCal™ .................................................................................p. 63
d. BioSelectTM .............................................................................p. 65
5. Communication Protocols Pages 69-83
a. Modbus RTU (RS485).....................................................................p. 69
c. HART................................................................................... p. 81

BioTrak 645S/745S
Table of Contents
Table of Contents | 8
6. Maintenance Pages 85-93
a. Safe Meter Removal from Retractor ........................................................p. 85
b. Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . p. 93
7. Appendices Pages 96-107
a. Specifications ...........................................................................p. 97
b. Agency Approvals ......................................................................p. 100
c. Dimensions .............................................................................p. 101
d. Warranty...............................................................................p. 104
e. Returning your meter....................................................................p. 104
8. Definitions Page 108
9. Index Page 109

1. Record inside diameter (ID). Ensure the actual pipe ID
matches the pipe ID shown on the factory calibration
certicate. If IDs do not match, refer to p. 59.
2.
Record up/downstream straight-pipe requirements
based on Pipe ID and meter style (insertion or inline).
[refer to p. 23]
3. a. The Flow Direction Indicator must point in the
direction of ow.
b. The housing can be rotated for a better view of
the meter's display. Note that the 2 set screws must
be loosened before the housing will turn. [refer to p.
29]
4.
Ensure correct probe depth setting. If using 1 ½" size
pipe, please see note on p. 26.
5. Open the housing. If needed, the orientation of
display can be rotated in 90° increments for a better
view.
[refer to p. 28 for more information]
6.
Ensure power wiring [p. 37] and 4-20mA wiring
[p. 38 - p. 39] are properly connected. [refer to
Wiring section p. 35 for more information]
7.
Verify the output signal wiring based on model type
(Pulse/Alarm or communication protocol) [refer to
Wiring section p. 38 for more information]
8.
Apply power to the ow meter.
9. Check the remaining ow meter settings by accessing the meter settings either through the front
panel of the display or by using the BioViewTM Software. Record the settings in the spaces given for
items A - F on the following page.
Use the table below as a guide while using the worksheet on the next page to record your notes.
NOTE! Please read the entire quick-start procedure before beginning installation.
ID OD
FLOW
4X = Inline
10X = Insertion
8X = Inline
15X = Insertion
Pipe ID min.
INDICATOR:
- POINT IN DIRECTION
OF FLOW
- REMOVE TO ROTATE
HOUSING ±90º,
±180º
- REPLACE INDICATOR
WHEN DONE
LOOSEN HOUSING
WITH 2 FRONT SET
SCREWS, RETIGHTEN
WHEN DONE
FLOW
FLOW
PIPE
0.73"
(18.5 mm)
L
C
F1 F2 F3 F4
ACCESS DISPLAY
BY UNSCREWING COVER
REMOVE SCREWS ON
DISPLAY TO ROTATE
DISPLAY ±180°
( - ) (+) ( - )(+)(
- )
Power
12-28VDC
4-20mA Pulse
!
( - )(+) ( - )(+)(
- )(+)
Power
12-28VDC
4-20mA Pulse
/Alarm
!(
- )(+)
Power
12-28VDC
4-20mA(
-
)
!
4-20mA(+) Common Tx/Rx(
-
)
Tx/Rx(+)
F1 F2 F3 F4
Initializing...
BioTrak 645S/745S
Quick Start Guide | 9
Quick Start Guide
Quick Start Guide | 9

Item to verify
Serial Number: Serial Number: Serial Number: Serial Number:
1. What is the Pipe ID? ID = ID = ID = ID =
2. Calculate the Upstream/
Downstream straight-pipe
requirements
UP =
DN =
UP =
DN =
UP =
DN =
UP =
DN =
3. a. Is the flow indicator pointed in
direction of flow?
b. Must the housing be rotated for
easy viewing?
Y / N
Y / N
Y / N
Y / N
Y / N
Y / N
Y / N
Y / N
4. Is the probe depth setting correct? Y / N Y / N Y / N Y / N
5. Have you rotated the display for
easier viewing?
Y / N Y / N Y / N Y / N
6. Verify proper power wiring
7. Verify proper input/output wiring
After applying power to your meter, check items A - F below by accessing the meter settings either through
the front panel of the meter's display or by using the BioView™ software tool.
A. Which flow units have been set in
meter? (SCFM, KG/H, etc..)
B. Correct values for reference
temperature and pressure?
Y / N Y / N Y / N Y / N
C. Confirm the pipe ID listed above
same as "Pipe_id="
D. Verify 4mA and 20mA meter
settings
4mA =
20mA =
4mA =
20mA =
4mA =
20mA =
4mA =
20mA =
E. Confirm the correct gas is
selected for your application in the
BioSelectTM menu
Before applying power to your meter, use this worksheet to record your notes.
If you are experiencing any problems after completing this procedure, please call the Sierra
Instruments Tech Department at 831-373-0200 to review this information.
Your Notes:
BioTrak 645S/745S
Quick Start Guide | 10
Quick Start Guide

MAINMENU
I/OFLODSPEXIT
SETI/O
COM420EXIT
Comm=Modbus
NXT OK
None
Modbus
mA=Flow
NXT OK
20mACnt=3265
CHG OK
4mACnt=367
CHG OK
20mA=2345.6SCFM
CHG OK
4mA=0SCFM
CHG OK
Temp
Flow AnalogOutputs
Baud=9600
NXT OK
Parity=NONE
NXT OK
Address=02
CHG OK
Modbus
only
1200
2400
4800
9600
19200
38400
57600
76800
115200
NONE
ODD
EVEN
01‐247
Entermenubyscrollingtodisplay4
andenteringthepassword
mAFault=Notused
NXT OK
Notused
3.6mA
21mA
Baud=9600
NXT OK
9600
19200
38400
57600
76800
115200 MAC_add=3
CHG OK
Max_master=127
CHG OK
ID=12345
CHG OK
Name=SITE1
CHG OK
BACnet
only
SETI/O
PUL420EXIT
IfRS485hardwaredetected
/withlicense
Communication
OR
Level2
only
OR SETI/O
COMPUL420EXIT
Comm=HART
OK
Address=0
CHG OK
Ifpulse/alarmhardwaredetectedIfHARThardwaredetected/withlicense
0‐63
Display Menu, p. 15
Flow Menu 1, p. 13
Digital Output Menu, p. 12
BioTrak 645S/745S
Introduction | 11
Introduction
Fig. 1.1: 645S/745S Menu Tree - Main Menu

OUT=Pulse
NXTOK
Notused
Pulse
HiFloAlm
LoFloAlm
HiTempAlm
LoTempAlm
SystemAlm
PulseOutput
P/UU/PFEQEXIT
PLS/UNT=2
CHGOK
UNT/PLS=0.5
CHGOK
MaxFreq=100Hz
CHGOK
MaxFlo=5000SCFM
CHGOK
HiFloAlm=500SCFM
CHGOK
LoFloAlm=100SCFM
CHGOK
HiTmpAlm=250°F
CHGOK
LoTmpAlm=10F
CHGOK
HighFlowAlarm
LowFlowAlarm
HighTempAlarm
LowTempAlarm
Select1of3
methodstoscale
thepulseoutput
Pulse
OUT=HiFloAlm
NXTOK
OUT=LoFloAlm
NXTOK
OUT=HiTmpAlm
NXTOK
OUT=LoTmpAlm
NXTOK
SetI/O
PUL420EXIT
Alarmoutput
MAINMENU
I/OFLODSPEXIT
OUT=SystemAlm
NXTOK
SystemAlarm
(See Flow Menu 2, p. 14, for more alarm settings)
NOTE! A value of 0 disables the
alarms
BioTrak 645S/745SBioTrak 645S/745S
Introduction | 12
Introduction
Fig. 1.2: 645S/745S Menu Tree - Digital Outputs

FLOWMENU1
DGNUNTFM2EXIT
DIAGNOSTIC
SIMBioCal EXIT
FloSim=0SCFM
CHG OK
TmpSim=0°F
CHG OK
FLOUNT=SCFM
NXT OK
SCFM
SCFH
NM3/H
NM3/M
KG/H
KG/M
KG/S
LBS/H
LBS/M
LBS/S
NLPH
NLPM
MMSCFD
LBS/D
SLPM
NLPS
MSCFD
SM3/H
MT/H
NM3/D
MMSCFM
MCFD
SCFD
SM3/M
SM3/D
TMPUNT=°F
NXT OK
DegF
DegC
TmpRef=60°F
CHG OK
PRESUNT=Psia
NXT OK
PresRef=14.73
CHG OK
mmHG
Psia
bara
STP
SimulateFlow?
YES NO
SimulateTemp?
YES NO
DNS=1.2323kg/m3
OK
MAINMENU
I/OFLODSPEXIT
ENABLESIM?
YES NO
Flow Menu 2 Menu, p. 14
BioCal™ Menu, p. 16
BioTrak 645S/745S
Introduction | 13
Introduction
Fig. 1.3: 645S/745S Menu Tree - Flow Menu 1

FLOWMENU2
GASSPCPRMEXIT
Kfact=0%
CHG OK
RESETCRC?
YES NO
Cutoff=12.5SCFM
CHG OK
Pipe_id=4.026In
CHG OK
Filter=0.8Sec
CHG OK
Parameters
Flowcutoffinselectedunits
Pipeidininchesormm
FlowFilterinseconds
Min=0.8,max=10
HiFloAlm=0SCFM
CHG OK
LoFloAlm=0SCFM
CHG OK
HiTmpAlm=0SCFM
CHG OK
LoTmpAlm=0SCFM
CHG OK


Thesealarmscanbeusedwithoutthedigitaloutputassignedtothe
alarm.
Ifthatisthecase,thealarmstatuswillonlybeshownonthe
display,throughserialcommunicationorBioViewTM.
 Ifthedigitaloutputisassignedtoanalarm,changingthevaluehere
willchangethatsetting.
Level2
RESTOREDATABASE?
YES NO
SETNRT?
YES NO
AREYOUSURE?
YES NO
TOTRSTOFF
OK
Thismessagewillshowfor3seconds
beforereturningtotheFlow
Parameter2Menu.
WARNING:Oncethenon‐resettable
totalizerisactivated,itcannotbe
undone.
MAINMENU
I/OFLODSPEXIT
FLOWMENU1
DGNUNTFM2EXIT
BioSelectTM Menu, p. 17
BioTrak 645S/745SBioTrak 645S/745S
Introduction | 14
Introduction
Fig. 1.4: 645S/745S Menu Tree - Flow Menu 2

DISPLAY/PASSWORD
DSPPSWEXIT
DSP1L1=FLorate
NXTOK
FLorate
Total
Elps
Temp
Alarm
DSP1L2=Total
NXTOK
DSP2L1=temp
NXTOK
DSP2L2=Elps
NXTOK
ALTERNATE=Off
NXTOK
On
Off
PASSWD=1234
CHGOK
FLorate
Total
Elps
Temp
Alarm
FLorate
Total
Elps
Temp
Alarm
FLorate
Total
Elps
Temp
Alarm
Whenalternate
"ON",flashes
betweenthe2
displays
Display1
Line1
Display2
Line1
Display2
Line2
MAINMENU
I/OFLODSPEXIT
Display1
Line2
BioTrak 645S/745S
Introduction | 15
Introduction
Fig. 1.5: 645S/745S Menu Tree - Display Menu
NOTE! All readings updated every second
• Flo Rate = Flow rate of process gas
• Total = Total ow of process gas
• Elps = Elapsed time since reset of ow total
• Temp = Temperature of process gas
• Alarm = Notication of errors; diagnostic errors

DIAGNOSTICMENU
SIMBioCalEXIT
BioCalMENU
VER EXIT
VerifyingBioCal
PleaseWait
VerifyingBioCal
0.512 T=123
BioCal=0.259
Pass OK
Displaysthetest’s
countdowntimer
DisplaysaBioCalvalue
duringtest
VERIFYBioCal?
YES NO
BioCal=0.911
Warning OK
BioCal=2.321
Fail OK
FLOWMENU1
DGNUNTFM2EXIT
MAINMENU
I/OFLODSPEXIT
BioCalFail
Greaterthan±1.0
BioCalPass
Lessthan±0.80
BioCalWarning
Between±0.80to±1.0
Flo:Holdvalue
NXT EXITOK
Holdvalue
Gotozero
TakeControl
Off‐lineEXITOK
BioTrak 645S/745SBioTrak 645S/745S
Introduction | 16
Introduction
Fig. 1.6: 645S/745S Menu Tree - BioCal™ Menu

FLOWMENU2
GASPRMEXIT
GAS=DigesterGas
NXT OK
Air
Methane
GasMix(100%)
OK
Onlyfor
Digester
Gasmix
Showsonlyifgasmix
doesnotequal100%.
PressingOKreturnsto
gasentry.
CO2=34.5%
UPDN OK
MAINMENU
I/OFLODSPEXIT
FLOWMENU1
DGNUNTFM2EXIT
Err:Mix=(110%)
OK
Methane=65.5%
UPDN OK
Showsonlyifnoerroris
detected.PressingOK
allowsexittomenu.
Besuremixtureequals100%.
OR
GAS=Methane
NXT OK
Air
Methane
DigesterGas
BioTrak 645S/745S
Introduction | 17
Introduction
Fig. 1.7: 645S/745S Menu Tree - BioSelectTM Menu

BioTrak 645S/745SBioTrak 645S/745S
Introduction | 18
Introduction
3124.6SCFM
CSV=0.3432Volt
Enter:PressF1&F2atthesametime
PressF4toreturntonormalmode
Screen10
Screen11
Screen12
Screen13
Pulse=1234.5cnt
mA_420=234cnt
Screen14
Elp=12.5HR
Stat(hex)=2800
Screen15
Alm=None
645S v1.0
Screen16
Screen17
MB_Sn=P23949
BB_Sn=P23945
Screen18
MTR_Sn=123456
SNS_Sn=234567
Screen19
TmpHi=0.0C
TmpLo=0.0C
F2KeyF1Key
Pwr_Cycl=24
Err_tot=0
FloHi=0.00SCFM
FloLo=0.00SCFM
BioCal=0.1
Flowratemeasuredbythemeter
CurrentSenseVoltageofsensormeasurementcircuit
DigitalcontrolcountsofPulseoutput
Digitalcontrolcountof4‐20mAoutput
Elapsedtimeofmeteroperation
Meterfunctionandoperationstatuscode
Meter’sactivealarms
Firmwareversionofmeter
Mainboardserialnumber
Bridgeboardserialnumber
Meterserialnumber
Sensorserialnumber
Alarmsetting
Alarmsetting
Alarmsetting
Alarmsetting
Totalnumberofpowercycles
Numberoferrorsintotalflowmeasurement
BioCal™measurementvalue
Fig. 1.8: 645S/745S Menu Tree - Engineering Screens
3124.6SCFM
csv=0.3432Volt
EnterLogMenu:PressF1&F2atthesametime
PressF4toreturntonormalmode
Display10
Display11
Display12
Display13
Pulse=1234.5cnt
mA_420=234cnt
Display14
Elp=12.5HR
Stat(hex)=2800
Display15
Alarm=None
FT4XV5.3
Display16
Display17
MB_Sn=P23949
BB_Sn=P23945
Display18
MTR_Sn=123456
SNS_Sn=234567
Display19
TmpHi=0.0°F
TmpLo=0.0°F
F3&F4pressedatthesametimewill
initiatea"Total"reset
Pwr_Cycl=24
Err_tot=0
FloHi=0.00SCFM
FloLo=0.00SCFM
CAL‐V=0.1
PwrOff=48.0
LOGMENU1
LOGTOTENGEXIT
Day1=0SCF
NXTPRVEXIT
Day40=0SCF
NXTPRVEXIT
4024‐hourtotalslisted
PressF1tonavigateup
PressF2tonavigatedown
PressF4toreturntonormalmode
Flowratemeasuredbythemeter
CurrentSenseVoltageofsensormeasurementcircuit
DigitalcontrolcountsofPulseoutput
Digitalcontrolcountof4‐20mAoutput
Elapsedtimeofmeteroperation
Meterfunctionandoperationstatuscode
Meter’sactivealarms
Firmwareversionofmeter
Mainboardserialnumber
Bridgeboardserialnumber
Meterserialnumber
Sensorserialnumber
Alarmsetting
Alarmsetting
Alarmsetting
Alarmsetting
Totalnumberofpowercycles
Numberoferrorsintotalflowmeasurement
CAL‐Vmeasurementvalue
Elapsedtimeofmeterpoweroffinhours
ResetTotal?
NOYES
ResettingTotal

Fig. 1.9: 645S/745S Menu Tree - Reset Flow Total

Welcome
Thank you for purchasing the BioTrak 645S/745S Thermal Gas Mass Flow Meter from Sierra
Instruments. The BioTrak is one of the most technically advanced flow meters in the world.
Extensive engineering eort has been invested to deliver advanced features, accurate measurement
performance, and outstanding reliability.
This instruction manual contains the electrical and mechanical installation instructions as well as details
for programming, maintaining and troubleshooting the meter. This manual is divided into the following
sections: Introduction, Installation, Wiring, Operation, Communications, Maintenance, Appendices,
Definitions, and Index.
Theory of Operation
The BioTrak is an innovative thermal mass gas flow meter and temperature transmitter. It is
microprocessor-based and field programmable. The 645S/745S thermal sensor operates on the law
that gases absorb heat. A heated sensor placed in an air or gas stream transfers heat in proportion
to the stream’s mass velocity. There are two sensor elements. One sensor element detects the
gas temperature and a second element is maintained at a constant temperature above the gas
temperature. The energy transferred from the heated element is proportional to the mass flow velocity.
The 645S/745S flow meter maintains accurate flow measurement over a large temperature and
pressure range.
Mass Flow
The BioTrak 645S/745S measures mass flow; an advantage over other flow meters which measure
volumetric flow rate. Volumetric flow is incomplete because temperature and pressure are unknown
and must be measured separately. For example, the mass flow of a gas depends on its temperature
and pressure. As temperature and pressure changes, the gas volume changes but not its mass.
Therefore a device measuring mass flow is independent of temperature and pressure changes. The
BioTrak 645S/745S provides a direct measurement of gas flow in mass units (kg/hr, lb/hr), standard
units (SCFM, SLPM) or normal units (NM3/hr, NLPM) with no additional temperature or pressure
measurements required.
Calibration Validation
Validate the calibration of the 645S/745S in the field using the BioCal™ test. The goal of Calibration
Validation is to provide operators with the ability to verify that the meter is capturing accurate data
at scheduled recalibration times - or at any time - instead of sending the meter back to the factory
for recalibration. By performing BioCal™ in the field, operators can verify that the meter is running
accurately by testing the functionality of the sensor and its associated signal processing circuitry.
This test can be done in the pipe under normal process conditions.
Flow Calibration
Every Sierra Instruments flow meter is set to the customer's configuration at the factory using an App
ID which is generated by the on-line configurator. The App ID specifies the gas type, flow range, serial
communication and other settings in the meter. If these settings match the final customer application,
the meter is ready to use. The Sierra Instruments Calibration Lab maintains instrument calibration data
on every flow meter. Calibration files include details on process conditions, customer gas, line size and
other information. All NIST-traceable equipment utilized for the calibration procedure is identified on
the Calibration Certificate, which is sent with every flow meter.
BioTrak 645S/745S
Introduction | 19
Introduction

I/O Description
The 645S/745S features one galvanically isolated 4-20mA analog output, HART communication
(optional), a pulse output, and Modbus RTU (RS485) (optional). There is also a USB port for interfacing
with a laptop or computer. The 4-20mA output can be used for HART communication. The 4-20mA
output can be configured for flow rate or process gas temperature and can be scaled by the user. The
pulse output can be used for pulse or alarm and is programmable to represent flow rate.
The BioViewTM software interfaces to the USB port and is a free Sierra Instruments PC-based software
program that displays flow meter readings and permits flow meter configuration. The software is
available for download on the Sierra Instruments website.
BioTrak 645S/745SBioTrak 645S/745S
Introduction | 20
Introduction