Fox Thermal Instruments FT3 User manual
105284
Rev. B
www.foxthermalinstruments.com | 399 Reservation Road Marina, CA. 93933
SPECIAL FEATURE OF THE FOX MODEL FT3
THERMAL MASS FLOW METER & TEMPERATURE TRANSMITTER
Calibration Validation
User's Guide
Fox Thermal Instruments, Inc.
This publication must be read in its entirety before performing any operation. Failure
to understand and follow these instructions could result in serious personal injury
and/or damage to the equipment. Should this equipment require repair or adjustment
beyond the procedures given herein, contact the factory at:
FOX THERMAL INSTRUMENTS, INC.
399 RESERVATION ROAD
MARINA, CA 93933
TELEPHONE: 831-384-4300
FAX: 831-337-5787
EMAIL: [email protected]
Download Technical Data Sheets from our website:
www.foxthermalinstruments.com
Fox Thermal Instruments believes that the information provided herein is accurate
however be advised that the information contained herein is NOT a guarantee
for satisfactory results. Specifically, this information is neither a warranty nor
guarantee, expressed or implied, regarding performance; merchantability; fitness;
or any other matter with respect to the products; nor recommendation for the use
of the product/process information in conflict with any patent. Please note that Fox
Thermal Instruments, Inc. reserves the right to change and/or improve the product
design and specification without notice.
Fox FT3 Manuals:
• Model FT3 Instruction Manual
• Fox FT3 RS485 Modbus Manual
• Fox FT3 HART Manual
• Fox FT3 View™Software Manual
Notice
Calibration Validation
FOX THERMAL INSTRUMENTS
2
Table Of Contents
Calibration Validation
TABLE OF CONTENTS
1. Introduction Page 4
a. Calibration Page 4
b. Calibration Validation Page 4
c. CAL-V™ Page 6
d. Zero CAL-CHECK™ Page 7
2. Start Up Page 8
a. CAL-V™ Page 8
b. Zero CAL-CHECK™ Page 8
c. Achieving Zero Flow Page 8
In Pipe Page 8
Out of Pipe Page 8
d. Setting Field Baseline Page 9
e. Packing Gland Assembly Page 10
f. Starting the Field Baseline Set Page 13
3. Operation Page 16
a. Performing CAL-V™ Page 16
b. Performing Zero CAL-CHECK™ Page 18
In Pipe Page 19
Out of Pipe Page 20
4. Glossary of Terms and Abbreviations Page 24
5. Troubleshooting Page 23
6. Index Page 25
3
Introduction
Thank you for purchasing the Model FT3 Thermal Gas Mass Flow meter and
Temperature Transmitter from Fox Thermal Instruments. The Model FT3 is
one of the most technically advanced flow meters in the world. Extensive
engineering effort has been invested to deliver advanced features, accuracy
measurement performance and outstanding reliability.
The new FT3 View software allows users to easily display data and configure
the FT3 to their specific application parameters. Then, log flow/temperature
data to an Excel file. The software can also activate the new Fox CAL-V™ and
Zero CAL-CHECK™ diagnostic functions.
This User's Guide contains the operation instructions for the Calibration
Validation diagnostic tests: CAL-V™ and Zero CAL-CHECK™.
This User's Guide is divided into the following sections: Introduction, Start
Up, Operation, Troubleshooting, Glossary and Index.
Calibration of the Fox Model FT3 Thermal Flow Meter
To ensure that all Fox flow meters meet specified performance parameters
and provide accurate, repeatable measurements in the field, all calibrations
are performed with NIST-traceable flow standards. Each meter is shipped
from the factory with a Fox Calibration Certificate.
Calibration Validation
Validating the calibration of your FT3 Flow Meter is simple and easy. By
performing two simple tests 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.
The first test, CAL-V™, tests the functionality of the sensor and its associated
signal processing circuitry and can be done in the pipe and in normal
processing conditions (see "CAL-V™ Calibration Validation Test" on page
6). The second test, Zero CAL-CHECK™, ensures the repeatability and
cleanliness of the sensor (see "Zero CAL-CHECK™ Calibration Validation Test"
on page 7).
See Figure 1.1 on the following page to understand Calibration Validation with
these two tests.
4
Introduction
Scope
Calibration Validation
INTRODUCTION
www.foxthermalinstruments.com
Introduction Calibration
Validation
Calibration
Calibration
Validation
CALIBRATION VALIDATION
FOX MODEL FT3 GAS FLOW METER
SENSOR AND ELECTRONICS TEST SENSOR TEST AT ZERO FLOW
VS. FIELD BASELINE
Zero CAL-CHECK™
INSITU INSITU OUT OF PIPE
• Completetestofsensorelementsandelec-
tronics
• Inyourpipe,undernormalprocess
conditions
• Operator-initiatedviafrontpanel,FT3View™,
MODBUS,orHART
• Holdoutputsatlastvalueorgotozero;
operator-selectable
• Testtakeslessthan5minutes;3minutes
typical
• Testresultsinpass/failmessage
• Datasavedinmeterforlook-upanytime
• CalibrationValidationCertificatecanbe
generatediftestisinitiatedusingFT3View™
software
• Customer-setzeroflowbaselineestablished
undernormalzeroflowconditions
• Testcomparessensorcharacteristicsatzero
flowwithcustomer-setzeroflowbaseline
• Operator-initiatedfromfrontpanel,FT3
View™,MODBUSorHART
• Failconditionindicatespossibledirtysensor
• UseofFoxPackingGlandAssemblytoretract
probeisaconvenientwaytoestablishazero
flowcondition
• Testtakeslessthan5minutesafterzeroflow
conditionestablished
• CalibrationValidationCertificatecanbe
generatediftestisinitiatedusingFT3View™
software
• Testcomparessensorcharacteristicsatzero
flowatambienttemperatureandatmospheric
pressurewithfactorycharacteristics
• UsedtoconfirmZeroCAL-CHECK™
wheninsituzeroflowconditioncannotbe
established
• Operator-initiatedfromfrontpanelorFT3
View™
• Testtakeslessthan5minutesafteroutof
pipeset-upcomplete
• CalibrationValidationCertificatecanbe
generatediftestisinitiatedusingFT3View™
software
FOX IS ISO 9001 CERTIFIED
The CAL-V™and Zero CAL CHECK™features are of particular value in environmental
monitoring applications where periodic calibration validation is mandated. For more
information, contact a Fox Application Specialist at (831) 384-4300.
CAL-V™
SENSOR TEST AT ZERO FLOW
VS. FACTORY BASELINE
or
Fig. 1.1: Total Calibration Validation
Figure 1.1 above illustrates the Calibration Validation feature and a summary
of the details for each of the two tests.
Fox has developed Calibration Validation, using the CAL-V™ and Zero CAL-
CHECK™ tests to help our customers avoid sending the meter back for
annual or biennial re-calibrations.
Using Calibration Validation allows our customers to validate the accuracy
and functionality of the meter in the field with a push of a button.
5
Introduction
Calibration Validation
INTRODUCTION
Calibration
Validation
SENSOR
SIGNAL
PROCESSING
ELECTRONICS
MICROPROCESSOR
MASS FLOW
MEASUREMENT
NORMAL MEASUREMENT MODE
Sensor
Control
Signal
PowerPro™ Sensor
Outputs
CAL-V™ MODE
Calibration
Validation
PASS/FAIL
MICROPROCESSOR
CALIBRATION
VALIDATION
SENSOR
SIGNAL
PROCESSING
ELECTRONICS
PowerPro™ Sensor
Sensor
Control
Signal
i
CAL-V™Calibration Validation Test
This menu allows the user to confirm the calibration accuracy of the Fox
FT3 Flow Meter by verifying the functionality of the sensor and sensor signal
processing circuitry. During the CAL-V™ calibration validation test, the
microprocessor adjusts the current to the sensor elements and determines
the resulting electrical characteristics. These site-determined characteristics
are compared with the data that was collected at the factory during the
original meter calibration. Matching data within established tolerances
confirms the meter is accurate within published accuracy specifications.
This test can be performed under no flow or normal flow conditions. The test
takes about 4 minutes to complete. At the conclusion of the test, a Pass or
Fail message will be displayed.
Note: If the CAL-V™ test is performed using the Fox FT3 View™ Software, at
the completion of the test, a CAL-V™ Certificate may be printed for a record
of the test. This certificate will display the CAL-V™ values and a pass/fail
result.
Fig. 1.2: Normal Mode vs. CAL-V™ Mode
6
Introduction
Section 1
Calibration Validation
INTRODUCTION
www.foxthermalinstruments.com
Zero CAL-CHECK™
Calibration Validation
Introduction
CAL-V™
VOLTAGE
PROPORTIONAL
TO
FLOW RATE
MICROPROCESSOR
MASS FLOW
CALCULATION
NORMAL MEASUREMENT MODE
PowerPro™ Sensor
Outputs
Zero CAL-CHECK™ MODE
Calibration
Validation
PASS/FAIL
MICROPROCESSOR
BASELINE RATE
COMPARISON
VOLTAGE
AT
ZERO
FLOW RATE
PowerPro™ Sensor
Process Flow “No Flow” Condition
i
Zero CAL-CHECK™Calibration Validation Test
The Zero CAL-CHECK™ test is used to ensure that the flow meter still
retains its original NIST-traceable calibration at zero flow. If zero flow can be
established, the sensor does not need to be removed and the procedure can
be done in the pipe. Alternatively, a Fox Packing Gland Assembly can be used
to remove the sensor from the gas stream to create a “no flow” condition.
Note: If the Zero CAL-CHECK™ test is performed using the Fox FT3 View™
Software, at the completion of the test, a Zero CAL-CHECK™ Certificate may
be printed for a record of the test. This certificate will display a pass/fail
result.
Fig. 1.3: Normal Mode vs. Zero CAL-CHECK™ Mode
7
Introduction
Section 1
Calibration Validation
INTRODUCTION
399 Reservation Road, Marina, CA 93933 Ph: 831.384.4300 Fax: 831.384.4312
Zero CAL-CHECK™
Calibration Validation
Introduction
Starting Up CAL-V™
CAL-V™ may be performed at any time after installation and at any flow rate,
including zero flow. You do not need any extra equipment or paperwork to
perform a CAL-V™ test. Refer to "Performing a CAL-V™ Calibration Validation
Test" on p. 16 of this User's Guide to start CAL-V™.
Starting Up Zero CAL-CHECK™
There are a few ways that Zero CAL-CHECK™ is different than CAL-V™:
• The Zero CAL-CHECK™ test must be performed at a "no flow" condition
(ie zero flow)
• If the Zero CAL-CHECK™ test is to be performed in the pipe, the field
baseline must be set before an actual test can be performed (see "Setting
Field Baseline for In-Situ Zero CAL-CHECK™ Tests" on p. 9).
• If the Zero CAL-CHECK™ test is to be performed out of the pipe, the
meter must be set upside-down (probe pointing up) and the PVC sensor
protector that the meter was shipped with must be placed back over the
sensor to achieve the factory baseline that the meter has been set with.
Techniques for Achieving Zero Flow - In the Pipe
In-situ (in the pipe) Zero CAL-CHECK™ testing can be achieved in one of two
common ways:
1. Fox Packing Gland Assembly
The first in-situ option is achieved through the use of a Fox Packing Gland
Assembly that may be ordered as an option for most inline- or insertion-
type meters. The assembly allows the operator to retract and isolate the
sensor from the process in order to conduct the Zero CAL-CHECK™ test.
This is particularly beneficial for applications in which the process is not
easily stopped.
2. Pipe Bypass / Valving-Off
The second in-situ option, if space allows, is to redirect the flow through
a bypass pipe section or valve off the meter in order to isolate the
meter's sensor in the place where it has been installed. While the flow is
redirected, the Zero CAL-CHECK™ test can be performed. Once the test
is complete, the valves to the bypass may be closed and flow may be
directed back to the meter's sensor where flow monitoring can continue
as normal.
Achieving Zero Flow - Out of Pipe
If space limitations prevent in-situ testing at zero flow as listed above, then
8
Start Up
Calibration Validation
START UP
www.foxthermalinstruments.com
CAL-V™
Zero CAL-CHECK™
Achieving Zero Flow
- In-Situ (In the Pipe)
Achieving Zero Flow
- Out of Pipe
i
Out of Pipe testing must be performed.
With this configuration, the meter must be removed from the process, the
test performed, and then the meter returned to the process after testing has
been completed.
Due to the high sensitivity of the PowerPro™ sensor, it is necessary to isolate
the sensor once the meter has been removed from the pipe. Therefore, Fox
provides a sensor cover when the meter is shipped to the customer. An
alternative to the sensor cover is to use a bottle or other closed container in
order to isolate the sensor and achieve the "no flow" condition necessary to
perform the Zero CAL-CHECK™ test.
Fig. 2.1: Fox-Supplied PVC Sensor Protector vs. Plastic Bottle
Setting Field Baseline for In-Situ Zero CAL-CHECK™ tests
After calibration of every FT3 meter, a lab technician sets the factory baseline
for Zero CAL-CHECK™ tests. If you are planning on removing the meter
from the process to perform the test, you do not have to set the baseline;
however, if you plan to perform the test in-situ (in the pipe) or using a Fox
Packing Gland Assembly, you must set the field baseline before performing
the test.
9
Start Up
Calibration Validation
START UP
399 Reservation Road, Marina, CA 93933 Ph: 831.384.4300 Fax: 831.384.4312
Setting Field
Baseline
NOTE: For best results:
1. Use the factory-supplied PVC sensor protector shipped with the meter
(see Fig. 2.1 above).
2. Place the meter upside-down on a flat, solid surface before starting the
test.
3. Do not allow the meter to get jostled - make sure the meter is stable
and the sensor completely isolated.
F1 F2 F3 F4
Packing Gland Assembly
Pipe
Exposed probe section
Valve Shut-off Handle
Probe in pipe
Sensor
Fittings
FT3 Meter
i
Using a Fox Packing Gland Assembly
The following are the instructions for using a Fox Packing Gland Assembly to
set the field baseline for - or performing - an in-situ Zero CAL-CHECK™ test.
If you are not using a Fox Packing Gland Assembly, move ahead to "Starting
the Field Baseline Set" on p. 13.
Note: If you need information on the installation of the Fox Packing Gland
Assembly, refer to Fox Document 102497.
Fig. 2.2: FT3 and Parts of Fox Packing Gland Assembly
10
Start Up
Calibration Validation
START UP
www.foxthermalinstruments.com
Packing Gland
Assembly
Large Nut
Small Nut
End Fitting
Adjacent Hex
Fittings
7
/
8
”
w
r
e
n
c
h
1
3
/
1
6
”
w
r
e
n
c
h
Small Nut
Adjacent Hex
Fig. 2.3: Close-Up: Fittings of Fox Packing Gland Assembly
In order to isolate the sensor, it must be retracted from the pipe. Loosen the
small nut of the compression fitting using 7/8" and 13/16" wrenches. Once
loosened, the probe will be able to slide upwards (see Figure 2.4 below).
Fig. 2.4: Loosening the Compression Fitting
11
Start Up
Calibration Validation
START UP
399 Reservation Road, Marina, CA 93933 Ph: 831.384.4300 Fax: 831.384.4312
Packing Gland
Assembly
F1 F2 F3 F4
Sensor removed
from Process
Slide meter up
Pull handle down CW
90° to shut off valve
Sensor in Chamber
Small Nut Adjacent Hex
Pull handle down CW
90° to shut off valve
Lift to unlock
handle
With one hand supporting the meter, slide the probe up through the packing
Gland Assembly until the internal stop makes contact. Close the Valve
Shut-offhandlebyturningthelever90˚clockwisetoisolatethesensor
within the chamber of the Packing Gland Assembly. Then slightly tighten the
compression fitting to keep a seal in the chamber.
Fig. 2.5: Isolating the Sensor in Packing Gland Assembly Chamber
12
Start Up
Calibration Validation
START UP
www.foxthermalinstruments.com
Packing Gland
Assembly
Now that the sensor is isolated in the chamber of the Packing Gland
Assembly, the FT3 meter is ready to either perform the Zero CAL-CHECK™
test or set the Field baseline for future tests.
When the meter has completed the test, be sure to open the shut-off valve,
slide the meter downward until the ferrule rests in the fittings, and tighten the
small nut of the fittings in order to seal the probe in the stream again.
Check to be sure the meter has returned to normal operation.
Starting the Field Baseline Set
After the meter has been installed and wired correctly (see the Fox FT3
Instruction Manual that came with the meter), power on the meter.
The meter should default to display #1. Press "F1" to program the meter.
Press Yes (F1) to set Parameters and you will be prompted to enter the
password. Use a Level 2 password (9111). The display will show:
F1 F2 F3 F4
Press FLO (F2) to go to the Flow Parameter 1 Menu.
F1 F2 F3 F4
Press DGN (F1) to go to the Diagnostic Test Menu.
F1 F2 F3 F4
Press TST (F2) to get to the Diagnostic Test Sub-Menu.
FLOW PARAMETER 1
DGN UNT PRM EXIT
SET PARAMETERS
I/O FLO DSP EXIT
DIAGNOSTIC
SIM TEST EXIT
13
Start Up
Calibration Validation
START UP
399 Reservation Road, Marina, CA 93933 Ph: 831.384.4300 Fax: 831.384.4312
Packing Gland
Assembly
Setting Field
Baseline
i
F1 F2 F3 F4
Choose ZRO (F2) for Zero CAL-CHECK™.
F1 F2 F3 F4
Choose PIP (F1) for in-situ Zero CAL-CHECK™.
F1 F2 F3 F4
To set the field baseline, choose SET (F2).
F1 F2 F3 F4
Choose YES (F1) to set the field baseline.
F1 F2 F3 F4
Note: At this point, you must make sure that there is a no flow condition in
the pipe (see "Techniques for Achieving Zero Flow - In the Pipe" on p. 8).
Also be sure that the meter will be stable for the duration of the setting
process.
Process Zero and
Stable? YES
SET ZRO Ref?
YES NO
ZERO PIPE TEST
VER SET PRM EXIT
ZERO CHK MENU
PIP BTL EXIT
DIAGNOSTIC
CALV ZRO EXIT
14
Start Up
Calibration Validation
START UP
www.foxthermalinstruments.com
Setting Field
Baseline
i
If there is no flow and the meter is stable, press YES (F4). The display will
show:
F1 F2 F3 F4
As the meter is setting the field baseline, the meter will display the reference
value for the Zero baseline (ZR=xx.xxxx) and a countdown timer (T=xx) to
approximate the time until the completion of the set.
Depending on the meter configuration, the set may take between 5-15
minutes to complete.
Note: Do not interrupt the set by touching the meter or changing conditions
in the pipe.
At the conclusion of the set, the display will show:
F1 F2 F3 F4
Press OK (F4) to return to the Zero CAL-CHECK™ menu.
The meter may now perform Zero CAL-CHECK™ tests at the Field Baseline
at any time.
Setting ZRO ref
ZR=x.xxxxx T=xx
Ref=x.xxxx
OK
15
Start Up
Calibration Validation
START UP
399 Reservation Road, Marina, CA 93933 Ph: 831.384.4300 Fax: 831.384.4312
Setting Field
Baseline
i
Performing the CAL-V™Calibration Validation Test
This menu allows the user to confirm the calibration of the FT3 by verifying
the functionality of the sensor and sensor signal processing circuitry. During
the CAL-V™ calibration validation test, the microprocessor adjusts current to
the sensor elements and determines the resulting electrical characteristics.
These site characteristics are compared with the data that was collected
at the factory during the original meter calibration. Matching data within
established tolerances confirms the meter is accurate. This test can be
performed under no flow or normal flow conditions. The test takes up to four
minutes to complete. At the conclusion of the test, a Pass or Fail message
will be displayed. Press F4 at the conclusion of the test to return to normal
measuring mode or to terminate the test.
Press FLO (F2) from the main menu. The display will show:
F1 F2 F3 F4
Press DGN (F1). The display will show:
F1 F2 F3 F4
Press TST (F2). The display will show:
F1 F2 F3 F4
Press CALV (F1) to perform the CAL-V™ verification test.
Note: The FT3 will stop measuring flow when performing this test. Press
EXIT (F4) to exit if you do not wish to continue.
FLOW PARAMETER 1
DGN UNT PRM EXIT
DIAGNOSTIC
SIM TST EXIT
16
Operation: CAL-V™
CAL-V™
Calibration Validation
OPERATION
DIAGNOSTIC
CALV ZRO EXIT
17
Operation: CAL-V™
CAL-V™
Calibration Validation
OPERATION
To select what the flow output will do during CAL-V™, choose from these options:
Go To Zero: Flow output will be zero during the test (ie 4mA)
Hold Value: Flow will hold last value during the test
F1 F2 F3 F4
Select the option using NXT (F1) and then press OK (F4).
F1 F2 F3 F4
WARNING: If you are using closed loop control, the system needs to be taken off-line
during the test.
Press OK (F4) to start CAL-V™. CAL-V™ test screen:
F1 F2 F3 F4
This test will take up to 4 minutes (less time if there is flow) and will show the Cal
value changing as the power to the sensor is adjusted. The T=xxx is a count down
Caution:
• The CAL-V™ test is valid for checking the calibration accuracy of
flow meters installed in the applications for which it was calibrated
including the gas/gas mixture, calibration range and pipe size shown
on the calibration certificate.
• For applications with temperature exceeding 250°F (121°C), CAL-V™
test results may vary.
• Periodic inspection for damage and cleaning of the sensor elements
is required.
Take Control
off-line EXIT OK
Verifying CAL-V
Cal = 12.7 T=123
Flo:Go to zero
NXT EXIT OK
timer indicating how much time is left to finish the test. A “Please Wait”
message will be flashing on and off on line 2 during this test.
F1 F2 F3 F4
Upon test completion, the final CAL-V™ value will be displayed along with a
Pass/Fail message.
Performing the Zero CAL-CHECK™ Calibration Validation Test
The Zero CAL-CHECK™ test is a companion test to CAL-V™. Unlike CAL-V™,
which may be performed in the pipe and at process conditions, Zero CAL-
CHECK™ must be performed at zero flow to ensure a valid test result. This
test is used to confirm that the flow meter still retains its original NIST-
traceable calibration at zero flow and that the sensor is free of film or residue
tat may affect readings. The test takes less than 5 minutes to complete. At the
conclusion of the test, a Pass or Fail message will be displayed. Press F4 at
the conclusion of the test to return to normal measuring mode or to terminate
the test.
Press FLO (F2) from the main menu. The display will show:
F1 F2 F3 F4
Press DGN (F1). The display will show:
F1 F2 F3 F4
Press TST (F2). The display will show:
FLOW PARAMETER 1
DGN UNT PRM EXIT
DIAGNOSTIC
SIM TST EXIT
18
Calibration Validation
OPERATION
Operation: Zero CAL-CHECK™
CAL-V™
Model FT3
CAL-V = 0.51
Passed OK
Zero CAL-CHECK™
F1 F2 F3 F4
Press ZRO (F2) to choose the type of Zero CAL-CHECK™ test. If performing
the test in the pipe, a "no flow" condition must be created. If performing out of
the pipe, the meter must be removed and the sensor protected by a bottle.
F1 F2 F3 F4
Performing the Zero CAL-CHECK™ - In the Pipe
Press PIP (F1) to choose to perform the test in the pipe. The display will
show:
F1 F2 F3 F4
Press VER (F1) key to verify the Zero CAL-CHECK™.
F1 F2 F3 F4
Press YES (F1) key to verify the Zero CAL-CHECK™.
F1 F2 F3 F4
WARNING: If you are using "Pipe" test, you must verify that there is a no flow
ZERO CHK MENU
PIP BTL EXIT
DIAGNOSTIC
CALV ZRO EXIT
ZERO PIPE TEST
VER SET PRM EXIT
VERIFY ZRO?
YES NO
Process Zero and
Stable YES
19
Operation: Zero CAL-CHECK™
Zero CAL-CHECK™
Calibration Validation
OPERATION
Zero CAL-CHECK™ -
In-situ (In the Pipe)
i
condition before proceeding. If you are performing the test in a bottle, be
sure to isolate the sensor in a bottle - any air movement (even from a fan)
can result in a false "fail" result.
Once process is stable, press YES (F4) key to begin the Zero CAL-CHECK™.
F1 F2 F3 F4
This test will take less than 5 minutes. The T=xx is a count down timer
indicating how much time is left to finish the test.
F1 F2 F3 F4
Upon test completion, the final percentage value will be displayed along with
a Pass/Fail message.
Performing the Zero CAL-CHECK™ - Out of Pipe
Remove the meter from the pipe and isolate in an area that will allow the test
to go undisturbed (see Note below).
Press FLO (F2) from the main menu. The display will show:
Verifying ZRO
Diff = xx.xx T=xx
Diff=x.xxx %
Passed OK
NOTE: For best results:
1. Use the factory-supplied PVC sensor protector shipped with the meter
(see Fig. 2.1 on p. 9).
2. Place the meter upside-down on a flat, solid surface before starting the
test.
3. Do not allow the meter to get jostled - make sure the meter is stable
and the sensor completely isolated.
20
Operation: Zero CAL-CHECK™
Zero CAL-CHECK™-
In Pipe
Calibration Validation
OPERATION
Zero CAL-CHECK™-
Out of Pipe
Zero CAL-CHECK™-
Out of Pipe
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