Siemens Transmitters for hydrostatic level, MPS series submersible sensor, 146, Integration

© Siemens AG 2008

SITRANS P measuring instruments for pressure

Transmitters for hydrostatic level

MPS series (submersible sensor)

■Overview

2

SITRANS P pressure transmitters, MPS series (submersible sensor)

SITRANS P pressure transmitters, MPS series, are submersible sensors for hydrostatic level measurements.

The pressure transmitters of the MPS series are available for var- ious measuring ranges and with explosion protection as an op- tion.

A junction box and a cable hanger are available as accessories for simple installation.

■Benefits

• Compact design

	Sensor
	U
	const.
Diaphragm
p	U	I	EM	+2	(brown) I		, U
				-1	(blue)	0	B
				Vent pipe
				Screen

SITRANS P pressure transmitters, MPS series, mode of operation and wiring diagram

On one side of the sensor, the diaphragm is exposed to the hy- drostatic pressure which is proportional to the submersion depth. This pressure is compared with atmospheric pressure. Pressure compensation is carried out using the vent pipe in the connection cable.

The hydrostatic pressure of the liquid column acts on the sensor diaphragm, and transmits the pressure to the piezo-resistive bridge in the sensor.

The output voltage of the sensor is applied to the electronic cir- cuit where it is converted into an output current of 4 to 20 mA.

The cable of the 7MF1570 transmitter must always be connected in the supplied junction box. The junction box has to be installed near the measuring point.

•Simple installation

•Small error in measurement (0.3%)

•Degree of protection IP68

■Application

SITRANS P pressure transmitters, MPS series, are used in the following branches for example:

•Oil and gas industries

•Shipbuilding

•Water supply

■Design

If the medium is anything other than water, it is also necessary to check compatibility with the specified materials of the transmit- ter.

■Integration

SITRANS P pressure transmitters, MPS series, have a flush- mounted piezo-resistive sensor with stainless steel diaphragm.

These pressure transmitters are equipped with an electronic cir- cuit fitted together with the sensor in a stainless steel housing. The cable also contains a strength cord and vent pipe.

The diaphragm is protected against external influences by a protective cap.

Junction box 7MF1570-8AA, opened

The sensor, electronic circuit and cable are sealed in a common housing of small dimensions.

The pressure transmitter is temperature-compensated for a wide temperature range.

■Function

SITRANS P pressure transmitters, MPS series, are for measuring the liquid levels in wells, tanks, channels and dams.

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Siemens FI 01 · 2009