Before Beginning Field Calibration; Dispense/Display Field Calibration Procedures; Tm Series Meters - GPI TM Series Operation Manual

You can field calibrate the meter if you are using
fluids other than water.
For improved accuracy under such conditions,
the GPI flow computer allows for "field" calibra-
tion, that is, user entry of custom calibration
parameters. A "single point" calibration may
yield acceptable accuracy in the middle of the
flow range, but 5 or more calibration points may
yield a higher level of accuracy, especially at
the lower end of the flow range. Up to 15
custom calibration points can be entered.
The use of a uniformly dependable, accurate
calibration container is highly recommended
for the most accurate results. Due to high
flowrate, it is strongly recommended that Field
Calibration be completed with a combination of
volume and weight using fine resolution scales.

Before Beginning Field Calibration

For the most accurate results, dispense at a
flowrate which best simulates your actual oper-
ating conditions. Avoid "dribbling" more fluid or
repeatedly starting and stopping the flow –
these actions will result in less accurate calibra-
tions.
Make sure you meet the meter's minimum
flowrate requirements:

TM Series Meters

1/2 inch meter
3/4 inch meter
1 inch meter
1-1/2 inch meter
2 inch meter
For best results, the meter should be installed
and purged of air before field calibration.
Dispense/Display Field
Calibration Procedures
1. Hold down CALIBRATE while pressing and
releasing DISPLAY until the field calibra-
tion curve appears ("CAL B" message will
be displayed). Release both buttons.
2. To calibrate, press and hold the CALI-
BRATE button. While continuing to hold
CALIBRATE, also press and hold the DIS-
PLAY button. Hold both buttons for about
3 seconds until you see a blinking "dd CAL"
message. Once the "dd CAL" message
appears, release both buttons. You are
now in field calibration mode.
1 GPM (3.8 LPM)
2 GPM (7.5 LPM)
5 GPM (18.8 LPM)
10 GPM (37.5 LPM)
20 GPM (75 LPM)
3. Once the buttons have been released from
Step 2, the display will show the blinking
message "run 01". If you want to exit the
calibration now before dispensing any fluid,
go to Step 11.
4. If you want to continue with the calibration,
but have not dispensed any fluid yet, make
your final preparations to your pumping
system, but don't start pumping yet.
5. Start your pumping system so that fluid
flows through the meter. The display will
stop blinking and show the "run 01" mes-
sage. Dispense into a container that allows
you to judge the amount of fluid pumped.
When you have pumped the desired amount
(for example, 10 gallons), stop the fluid flow
quickly.
6. Once the flow has stopped, briefly press
and release both buttons. At this point the
computer display will change to "0000.00"
with the left-hand digit blinking.
7. Enter the volume (amount) of fluid that you
dispensed (for example, if your 10-gallon
container is full, enter "10.0" for gallons or
"37.5" for litres). To enter numbers, use the
CALIBRATE button to change the value of
the digit that is blinking and use the DIS-
PLAY button to shift the "blink" to the next
digit.
8. Once the correct number is entered, briefly
press and release both buttons. The dis-
play will now change to a blinking "run 02"
message. You have installed the new cal-
curve point. You are ready to end calibra-
tion (Step 10) or enter another new calibra-
tion point (Step 9).
9. To enter another calibration point, go back
and repeat Steps 3 through 8. It is possible
to set up to 15 cal-curve points, and the
"run ##" message will increment each time
you repeat the calibration process (run 01,
run 02, run 03, etc., up to run 15).
10. To end calibration, press and hold both
buttons for about 3 seconds until you see
the "CAL End" message. After you release
the buttons the computer will resume nor-
mal operations with the new cal point(s)
active.
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