GPI GM001, Owner'S Manual, Page: 3 / 20

Terminal Connections
Remote Transmitter INPUTS / OUTPUTS
ISO-IN COM:
Return for
isolated inputs
ISO-LF IN: Optically-Isolated
High-level Low-frequency
Input
ISO-HF IN: Optically-Isolated
High-level High-frequency
Input
HL-LF IN: High-level Low-
frequency Input. 150 Hz
maximum
COIL-A IN: Low-level
Sinewave Input
COIL-B IN:
Low-level
Sinewave Input
HL-HF IN: High-level High-
frequency Input
EDM PWR:
Local Vcc. Regu-
lated 5-VDC internal power.
This terminal can supply up
to approximately 2.5 mA,
continuously, to external
circuitry. Typical load/line regulation under ordinary conditions is about ± 10%
LOCAL COM: Local Common
0-5 V OUT: 0 to 5 V Voltage Output. Frequency to Analog Output.
PULSE 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
LOOP (–): 4 to 20 mA Current Loop – current into transmitter
LOOP (+): 4 to 20 mA Current Loop – current out of transmitter
ISO-IN COM
ISO-LF IN
ISO-HF IN
HL-LF IN
COIL-A IN
COIL-B IN
HL-HF IN
EDM PWR
LOCAL COM
LOCAL COM
0-5 V OUT
PULSE OUT
LOOP (–)
LOOP (+)
WIRING
3
•
Remote
– The GX500 4-20 mA Out with Display con-
nects via an output cable as shown in the Wiring Dia-
gram.
Mount the GPI 4-20 mA Out with Display using bolts, screws
or standard U-bolts for pipes. Mounting options include:
• Wall
• Pipe
• Meter (1 inch FNPT conduit connection required)
Environmental
Choose a mounting location suitable for the 4-20 mA Out with
Display. The ideal mounting location is where the:
• flowmeter is as close as possible.
• mounting surface has minimal vibration.
• ambient temperature is +32°F to +140°F (0°C to
+60°C).
• cable lengths are minimal.
Avoid mounting locations where the 4-20 mA Out with Dis-
play is:
• subject to constant exposure to water or other liquids
(occasional low-pressure splashing will not harm unit
if cable entry points are well-sealed).
• subject to > 5g shock loading.
• facing the sun directly for long periods of time.
• close to high voltage/current runs, DC motors, internal
combustion engines, or frequency inverters.
Cable Guidelines
4-20 mA Current Loop:
• The current loop itself is very resistant to electrical noise
pickup and shielded cable is seldom needed except in
very “noisy” (electrical) locations and/or when very long
runs (thousands of feet) are used.
Sensor Cabling:
• Some products come with 20 ft. of shielded cable.
• If you require a longer cable, a 100 ft. cable kit is avail-
able from GPI, or use Belden 9363 cable. When wiring
longer lengths of cable, be sure to connect the shield
to LOCAL-COM ONLY! (Multiple shield connections
may cause ground-loop problems).
• Some trial and error may be needed because of the wide
variety of user conditions. Try to keep cable lengths
short!
This manual refers to various models of GPI flowmeters.
Determine what type of input the electronics will receive and
what type of output, if any, you require. Use the diagrams
found in the wiring diagrams section (if the unit is not already
wired) to correctly wire the system.
The display is externally powered by the loop.
NOTE: Totals will be lost with loss of power on loop.
The 4-20 mA Out with Display may come with 20 ft. of cable
to connect to the meter. The customer must supply the com-
munication loop cable. Although the unit is usually powered
through the communication loop, there are some circum-
stances that might require external power.
Connecting the Equipment:
• Remove the faceplate by removing the four (4) corner
screws.
• Attach wiring from your equipment according to the
following terminal connections and wiring diagrams,
depending on your circumstances.
Determine maximum power supply voltage after de-
termining maximum allowable voltage of all electronic
devices in the system.
CAUTION