Great Plains Industries TM Serie Manuel De L'utilisateur page 4

Flowrate Feature
To use this feature, press and release DISPLAY
until FLOWRATE appears to the left of the
bottom line.
When FLOWRATE is displayed, the numbers
on the middle line reflect the rate of flow, for
example, the current gallons per minute (GPM)
or litres per minute (LPM).
Activate the Meter
Turn the computer display ON by starting water
flow or briefly pressing the DISPLAY button.
The Batch or Cumulative Total from last use will
be displayed.
Press DISPLAY briefly to display the Batch
Total. Hold the DISPLAY button down for 3
seconds to reset the Batch Total to zero.
The computer display is programmed to turn
off automatically if not used for 4 minutes.
Factory and Field Calibration Curves
All calibration information is visible to the user
as words in the upper part of the display, above
the numeric digits.
All units are configured with a "factory" calibra-
tion curve. Both gallons and litres are available
("GAL" or "LTR" will be displayed). Use the
CALIBRATE and DISPLAY buttons to switch
between gallons and litres. This curve is NOT
user adjustable: the word "PRESET" is dis-
played to show this. (The factory calibration is
stored permanently in the computer's memory.)
The "field" calibration curve may be set by the
user, and can be changed or modified at any
time using the calibration procedure described
below in the Calibration Section. Totals or
flowrate derived from the field calibration are
visible when the field calibration setting is se-
lected ("CAL B" will be visible on the top line).
Selecting a Different
Calibration Setting
You can switch between GAL and LTR modes
at will without "corrupting" totalizer contents.
For example, the computer can totalize 10.00
gallons. If the user switches to LTR mode, the
display will immediately change to "37.50" (the
same amount in units of litres). GAL / LTR
switching also works in FLOWRATE mode.
4
To select a different calibration setting, first
press and hold the CALIBRATE button. Con-
tinue to hold it while also pressing and releasing
the DISPLAY button. (You may then also re-
lease the CALIBRATE button.) The flag indica-
tors in the top line of the display will change to
show the newly selected calibration setting.
Calibration settings change in this order: GAL,
LTR, CAL B, GAL, etc. While fluid is flowing,
only the GAL and LTR selections may be made.
However, when NO fluid flow is occurring, any
setting may be selected.
CALIBRATION
Before Beginning Field Calibration
For the most accurate results, dispense at a flow-
rate which best simulates your actual operating
conditions. Avoid "dribbling" more fluid or re-
peatedly starting and stopping the flow. This
can result in less accurate calibrations.
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
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 cali-
bration be completed with a combination of
volume and weight using fine resolution scales.
For best results, the meter should be installed
and purged of air before field calibration.
Field Calibration with
Computer Display
Field Calibration and Factory Calibration are
defined in the previous section. Factory cali-
bration settings are custom programmed into
each computer during production, using water
at 70°F (21°C). Readings using the standard
factory calibration curves may not be accurate
in some situations, for example, under extreme
temperature conditions or with fluids other than
water.
1 GPM (3.8 LPM)
2 GPM (7.5 LPM)
5 GPM (18.8 LPM)
10 GPM (37.5 LPM)
20 GPM (75 LPM)