Emerson Process Management MSP900SH manual = 3.9 Range of 4-20mA signal

	Installation, Operation & Maintenance Manual
MSP900SH	IP2040/IM, Rev. AA
	May 2007

Appendix 2 - Use with Mobrey Measurement MSP90 Series controllers – example

Programming example when using the new MSP900SH transmitter with an old style MSP90 Series controller.

A2.1 Vertical rectangular or cylindrical sump, originally displaying level in metres, 4.2m from transducer face to bottom of sump.

•The new MSP900SH should be mounted in the same position as the old transducer such that the distance to the bottom of sump is 4.2m. If this is not possible, re-measure the distance to the bottom of the sump once the MSP900SH transmitter is mounted.

•The MSP900SH transmitter should be configured with a bottom reference of 4.2m

(or whatever the new distance is) and the 4-20mA output ranged from 0m level to 3.9m level (4.2 - 0.3m dead zone = 3.9m).

If there is no HART device available to configure the MSP900SH in this way, refer to the note below.

•On the MSP90 control unit :

Set P39	= 7	(Current input)
Set P3	= 3.9 (Range of 4-20mA signal)
Set or check P21	= 0	(linear vessel)

Note : If it is not possible to re-range the MSP900SH transmitter on site, it may be used with factory default settings. The 4- 20mA from the MSP900SH transmitter is set for 4mA at 0m and 20mA at 11.7m.

In this case, P3 must be set to 11.7 as this is the full range of the transmitter signal.

If in doubt, do not hesitate to contact Mobrey Measurement Customer Support for further advice.

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