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Power Supply
The GPI Scaled Pulse circuit is designed to operate correctly
when supplied with any DC voltage between about 5-30 volts,
referenced to any of the COM terminals. The supply voltage need
not be regulated, as long as it falls within these limits. Reverse
polarity protection is included.
Normal operating current is about 10-15 mA, and will never
exceed 25 mA.
WARNING
Do not apply AC voltage to the unit. Low voltage AC will
not damage the unit, but may cause erratic operation.
Environmental
All electronic components in the GPI Scaled Pulse circuit are
rated for an operating temperature range of -40° F to +185° F
(-40° C to +85° C).
The circuit will operate correctly in humidity conditions up to
about 95% non-condensing. As with most electronic circuits,
exposed circuitry should not be subjected to liquid moisture.
No components of the Scaled Pulse circuit are especially sensi-
tive to shock or vibration. Ordinary back-of-truck vibration will
not damage the unit.
OPERATION
When installing the GPI Scaled Pulse Module, make sure that
all electrical connections are tight and secure.
The only user-adjustable settings are to the K-factor switches.
On a typical flowmeter, the K-factor is usually available, either
stamped on the unit itself or printed in the accompanying
documentation (if you cannot find it, please contact the meter's
manufacturer). Using a small straight blade screwdriver or similar
tool, simply set the module's K-factor switches to this number.
K - F A C T O R S W I T C H E S
X
X
22
X
X
X
The "X" markers represent the digits of the K-factor. This allows
a K-factor range of 0000.1 to 9999.9. The switches are arranged
and labeled as follows:
X
X
Each switch may be set to any of 10 positions (0-9). Set each so
that the whole string of switches represents the meter's K-factor.
The switches do not have any mechanical stops and may be
turned all the way around.
If the meter's K-factor does not contain a decimal point, set the
right-most switch to "0".
Example: Meter K-factor is 3555 PPG
3
5
If the meter's K-factor has more than one decimal position, you
must round the number so that you can set the switches with
only one decimal position.
Example: Meter K-factor is 5252.38 PPG
5
2
If the meter's K-factor is less than 1000.0 PPG, you must set
the left-most switches to "0".
Example: Meter K-factor is 75 PPG
0
0
645 PPG x 1.0 = Gallon
645 PPG x 0.1 = 1/10th Gallon
645 PPG x 10.0 - 10 Gallons
If you need one output pulse for every 1/10th unit instead of
every whole unit, multiply the meter's K-factor by 0.1 and then
enter the result on the switches.
If you need one output pulse for every 10 units, multiply the
meter's K-factor by 10.
Example: Meter K-factor is 645 PPG
645 PPG x 1.0 = Gallon, set 645
0
6
(1 Pulse Out = 1 Gallon)
645 PPG x 0.1 = 1/10th Gallon, set 64.5
0
0
(10 Pulses Out = 1 Gallon)
645 PPG x 10.0 - 10 Gallons, set 6450
6
4
(1 Pulse Out = 10 Gallons)
X
X
X
5
5
0
5
2
4
7
5
0
645
64.5
6450
4
5
0
6
4
5
5
0
0
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