Installation Guide UMSITRPDS3-1
Electrical Installation
This section outlines loop wiring for Point-to-Point and Multi-Drop networks. Refer to User’s Manual
UMSITRPDS3-1, Section 4 Installation for wiring diagrams and for installation in a hazardous area.
WARNING
Hazardous voltage can cause death or serious injury.
Remove power from all wires and terminals before
working on this equipment.
CAUTION
Use supply wires suitable for at least 5°C (10°F) above ambient temperature.
To connect the transmitter to the loop, perform the following steps.
1. Remove power from all involved wires and terminals.
2. Access the transmitter signal terminals (see Figure 6) by removing the enclosure cap nearest to the
electrical entrance. Turn the cap counterclockwise.
3. Strip loop cable and conductors. Install ring tongue or spring spade tongue terminals for #8 screws
and the cable conductor gauge. If terminals will not be used, tin conductor ends and form a loop.
4. Connect the loop cable to the LOOP (+) and (-) terminals inside the transmitter’s enclosure.
Terminals will accommodate wire sizes up to 16 AWG (1.3 mm
2
).
5. Install the enclosure cap by turning it clockwise until the O-ring contacts the enclosure, Tighten the
cap one additional turn to compress the O-ring.
6. If one of the two electrical conduit entrances in the housing is not used, it should be plugged; see
Figure 15. Refer to the transmitter’s rating plate and Section 9, in the User’s Manual, to determine
whether entrance holes accept 1/2-NPT or M20 x 1.5 fittings.
Seal a 1/2-NPT fitting with Teflon tape; seal an M20 fitting with a soft setting sealing compound
rated for at least 105ºC (221ºF).
7. Ground the enclosure by installing a 16 AWG (1.3 mm
2
) or larger copper wire between the enclosure
ground screw and a low resistance ground, such as a nearby metal cold water pipe.
This completes the physical installation.
16 February 2012
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