Analytical Industries GPR-7500 AIS Trace PPM Hydrogen Sulfide Analyzer - Manual (Page 16)

Advanced Instruments, Inc.
16
Hazardous Area Installation
The GPR-7500AIS may be installed in a hazardous area when adhered to the recommended installation
procedure.
Power Input
A 12-28 VDC or 100/230 VAC power supply with a shielded power cable is recommended. The power cable
to the Ex enclosure must be supplied through a conduit approved for use in hazardous area. Secure the
wires to the power input terminal block by using the integral screws of the terminal block. Do not substitute
terminal screws. With AC power, the power ground must be connected to the ground terminal marked on the
enclosure.
CAUTION: Check the QC for the proper power requirement. Incorrect power will severely
damage the analyzer
Output Connections
The transmitter has two adjustable alarms, one power fail alarm and 4-20 mA or 1-5 VDC signal output
connections.
CAUTION: The 4-20mA circuit does not require external power. Supplying external power to
the PCB will permanently damage the PCB .
The HI and LOW alarms are user configurable. The relays are rated at 5A @ 250 VAC.
The power failure alarm is a dry contact that will close when power is turned OFF. This relay is rated at 5A
@ 250 VAC.
CUTION: Do not exceed the recommended rating of the relays. Excessive power through the relays can
severely damage the relays and the PCB.
Fuse 50 mA
Power 12-28 VDC or
100/230 VAC
Alarm Relays and 4-20 mA Signal Intrinsically Safe
Ex d enclosure Fiber Glass enclosure
Procedure
Power requirements consist of a 12-28 VDC or 100/230 VAC power supply. Check the QC and analyzer
cover plate for proper power requirement.
Unscrew the cone shaped cover from the lower enclosure.
Separate the shielding from the wires of the cable.
Ensure the positive and negative terminals of the power supply are connected to the appropriate terminals of
the terminal block as marked. For AC power, connect primary, neutral and power ground to the respective
terminals.
Connect the shielding of the cable to the ground screw inside the enclosure.
Replace the cover.
1 A fuse