Emerson MSP422 User Manual download pdf (Page 18)

Reference Manual

IP2013, Rev BA

February 2012

Mobrey MSP422

3-8

Lightning / Surge

Protection and Other

Loop Devices

If the area is prone to lightning strikes or voltage surges, a suppressor device

may be installed between the transmitter and the control unit.

If an additional loop-powered device or separately powered device is included

in the two-wire loop, the transmitter must receive a minimum voltage of

12 Vdc at 21 mA loop current. (See "Load Limitations" on page A-2).

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Emerson MSP422 User Manual Page 18