Analytical Industries GPR-2500 Series Oxygen Transmitter - Manual (Page 14)

14
Power Connection:
Remove the front cover of the junction box located on left side of the transmitters by removing the four (4) screws
securing the cover and set them aside for reinstallation.
To assure proper grounding, connect the 4-20mA signal output to the external device (PLC, DCS, etc.) before
attempting any zero or span adjustments.
Power requirements consist of a two wire shielded cable and a 12-36V DC with negative ground power supply.
Procedure:
1. Loosen the nut on the cable gland.
2. Separate the shielding from the wires of the cable.
3. Thread the wires through the cable gland into the inside of the
junction box.
4. Connect the two wires to the two (2) screw type terminals of the
barrier strip inside the junction box.
5. Ensure the positive and negative terminals of the power supply are
connected to the appropriate terminals of the barrier strip as
marked.
6. Connect the shielding of the cable to the copper ground screw inside
the junction box.
7. Replace the junction box cover ensuring the gaskets are in place and
tighten the four (4) screws.
8. Tighten the cable gland to maintain NEMA 4 rating.
Hazardous Area Installation:
The GPR-2500/2500MO transmitters may be installed in a hazardous
area with specific intrinsic safety barriers and a barrier enclosure
approved for use with the safety barrier selected.
MTL 702 type barriers and a 24VDC power supply with two (2) wire shielded cable are recommended.
Requirements include a 4-20mADC two (2) wire signal and a power requirement of 20mADC per channel at 24VDC
minimum.
Refer to drawing A-2439 for wiring instructions. The following chart identifies the required wire based on the
distance from the safety barriers to the two wire transmitters.
4,500 ft. – 22 AWG
7,200 ft. – 20 AWG
11,500 ft. – 18 AWG
18,500 ft. – 16 AWG
29,500 ft. – 14 AWG