21
COIL-A: To flowmeter sensor.
COIL-B: To flowmeter sensor.
HL-HF IN: N/A
HL-LF IN: N/A
COM: Local Common (3 terminals are equivalent)
O.C. OUT: Pulse-Out Frequency Output Signal. It is an
“open-collector” output (also known as “n-p-n” or
“current-sinking”), referenced to transmitter Local-
Common.
+5-30 VDC: Power supply of 5 to 30 VDC, 25 mA maxi-
mum current.
T E R M I N A L C O N N E C T I O N S
+5-30 VDC
COM
HL-LF IN
COIL-A
COIL-B
HL-HF IN
COM
COM
O.C. OUT
COM
OC OUT
5-30 VDC
COM
TO FLOWMETER
TO FLOWMETER
W I R I N G D I A G R A M 1
Note: Pull-up resistor only required if not supplied by receiving equipment.
Circuit Output
The GPI Scaled-Pulse circuit has a single output. It is a true
open-collector type, referenced to any of the COM terminals.
This output is rated for a maximum sink current of 200 mA, and
a maximum open circuit voltage of 60 V. Be sure that you never
exceed these limits.
NOTE:
Do not apply any AC voltage to this output, as the
internal device may be damaged.
The output produces a single fixed-duration pulse (pulls “low”
briefly) once per “n” input pulses, where “n” is the number set
by the K-factor switches (see operational description). A relay is
not supplied; however, the user may drive a relay by connecting
the coil from the positive DC voltage supply to the open collec-
tor output. If so, a DC coil relay should be chosen, with its coil
voltage equal to the supply voltage and resistance chosen to
limit current to less than 200 mA.
The duration of the output pulse is fixed at 25 milliseconds. This
duration is long enough to operate a typical relay or mechanical
counter. However, a very low K-factor may result in an output
that appears to be “ON” all the time. Shorter (or longer) output
pulse durations can be supplied, and may be available on special
order from the factory.
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