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Reference Manual
IP2013, Rev BA
February 2012
3-7
Mobrey MSP422
ELECTRICAL
INSTALLATION
NOTE!
The MSP422 is not intrinsically safe certified, and is therefore for use in
non-hazardous (Ordinary Location) installations only.
Cabling the Transmitter The Mobrey MSP422 is a two-wire, loop-powered transmitter requiring an
external 24 Vdc power supply. There is one M20x1.5 cable entry. A suitable
conduit system or cable gland must be used to keep the weather-proof rating.
To cable the transmitter:
1. Make sure that the power supply is switched off.
2. Remove the cover of the transmitter housing.
3. Pull the cable through the cable gland/conduit.
4. Wire the transmitter as shown in Figure 3-4.
5. Connect the cable screen (shield) to ground at one end only.
6. Replace the cover, tighten the cable gland.
Figure 3-4. MSP422 Wiring
After Completing the
Wiring
To maintain the weather-proof rating and hazardous area protection of the
transmitter, ensure all cable glands, blanking plugs, and seals are in good
condition.
Check that the cover seal is in good condition, and not twisted or misaligned
in the seal location groove. When replacing the cover, tighten the three cover
screws evenly to exert uniform pressure on the cover seal.
Min. 12 Vdc
0.15 to 0.31 in.
(Ø4 to 8 mm)
Twisted-pair, Screened
Min. 0.22 mm
2
(24 SWG / 23 AWG)
Max. 1.5 mm
2
(16 SWG / 18 AWG)
+12 to 30 Vdc
0 Vdc
Max. 3000 m (9750 ft.)
T1: 24 Vdc
T2: 0 Vdc