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Reference Manual
IP2048/RM, Rev AA
Section 3: Installation
February 2015
Relays
The MSP400RH has two integral relays which may be used for fault indication or control
purposes. These relays are for light duty and should be used as signal relays only, with control
functions being performed by external control relays.
Relay 2 is defaulted as a 'fault' relay - normally energized - but may be re-configured
on-site as a set-point relay if required.
Relay status indicators are on the LCD inside the housing (see “Display and
push-buttons” on page 21.)
3.4.3 Connecting the cable wires to the MSP900GH
The MSP900GH is for intrinsically safe installations.
Note
Make sure the power supply is off when connecting the transmitter.
Installation in a non-hazardous (ordinary location) area
Connect the cable wires to the transmitter as shown in Figure 3-8 on page 19. See also “Wiring
to allow HART communications” on page 19 if HART digital communications is required.
Installation in a hazardous area
Connect the cable wires to the transmitter as shown in Figure 3-8 on page 19. See also “Wiring
to allow HART communications” on page 19 if HART digital communications is required.
When the MSP900GH is powered by a Mobrey MCU900 Series control unit, no safety barriers are
required as the output from the control unit is Intrinsically Safe.
If powering the transmitter from any other power supply, ensure a suitable intrinsically safe
barrier is fitted in the non-hazardous (safe) area. The barrier must be chosen such that its output
parameters Uo, Io and Po are less than Ui, Ii and Pi of the transmitter (see Appendix B: Product
Certifications). The sum of the capacitance and the inductance of the transmitter and the
connecting cable fitted must not exceed the maximum specified for the barrier chosen.
Note
Make sure that the instruments in the loop are installed according to intrinsically-safe
field wiring practices and control drawings, when applicable.
Table 3-3. Connections for The MSP900GH
Connections
Terminal 1 24 Vdc
Terminal 2 0 Vdc
Terminal 7
(1)
(1) See “Remote temperature sensor” on page 19 for further information.
Remote temperature sensor (if used).
Terminal 8
(1)
Remote temperature sensor (if used).
Earth Screen Connect the cable shield/screen to ground (earth) in the control room.