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Reference Manual
IP2048/RM, Rev AA
Section 3: Installation
February 2015
3.4 Electrical installation
3.4.1 Connecting the cable(s) to the transmitter
The Mobrey MSP400RH and MSP900GH are two-wire loop-powered transmitters accepting
power supplies as follows:
MSP400RH:12 to 40 Vdc (non-hazardous area only)
MSP900GH:12 to 40 Vdc (non-hazardous area) or 12 to 30 Vdc (hazardous area)
Note
To comply with the CSA approval, a transmitter must be powered from a Mobrey
MCU900 Series control unit, or a class 2 or separate extra-low voltage (SELV) source.
Other devices may reset if connecting the transmitter to a multi-drop system while the
loop is powered. De-energize the loop to avoid devices being reset
Each transmitter is supplied with two cable entries. A suitable conduit system or cable gland
must be used to maintain the weather-proof rating and hazardous area protection. Any unused
entry must be sealed with a suitably rated blanking plug.
A two-core, shielded/screened cable is required for external power supply and output signal
connections. The cable is not supplied.
Connect the cable(s) to the transmitter
1. Make sure that the power supply is disconnected.
2. Undo the three cover screws and then lift the transmitter housing cover.
3. Pass the cable through the cable gland/conduit.
4. Connect the cable wires:
a. For the MSP400RH, see “Connecting the cable wires to the MSP400RH” on page 17.
b. For the MSP900GH, see “Connecting the cable wires to the MSP900GH” on page 18.
5. Connect the cable shield/screen to a suitable ground (earth) at one end only.
6. Replace the cover, tighten the cable gland, and connect the power supply.
What to do after completing the cabling
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.