GPI TM Series Operation Manual page 3

For improved accuracy under such condi-
tions, the GPI flow computer allows for "field"
calibration, 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
operating conditions. Avoid "dribbling" more
fluid or repeatedly starting and stopping the
flow – these actions will result in less
accurate calibrations.
Make sure you meet the meter's minimum
flowrate requirements:
TM Series Meters
TM050 1/2 inch meter
TM075 3/4 inch meter
TM100 1 inch meter
TM150 1-1/2 inch meter 10 GPM (37.5 LPM)
TM200 2 inch meter
For best results, the meter should be install-
ed and purged of air before field calibration.
Dispense/Display Field
Calibration Procedures
1. Hold down CALIBRATE while pressing
and releasing DISPLAY until the field cali-
bration 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
DISPLAY 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)
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 dispens-
ing any fluid, go to Step 11.
4. If you want to continue with the calibra-
tion, 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"
message. 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
"0000.0" 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 DISPLAY button to
shift the "blink" to the next digit.
8. Once the correct number is entered,
briefly press and release both buttons.
The display will now change to a blinking
"run 02" message. You have installed the
new cal-curve point. You are ready to
end calibration (Step 10) or enter another
new calibration 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 normal operations with the new
cal point(s) active.
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