SITRANS LH100 pressure transmitter

■Benefits

• Compact design

• Simple installation

• Small error in measurement (0.3 %)

• Degree of protection IP68

■Application

SITRANS LH100 pressure transmitters are used in the following

branches, for example:

• Shipbuilding

• Water/waste water supply

• For use in unpressurized/open vessels and wells

■Design

The pressure transmitter has a built-in ceramic sensor which is equipped with a Wheatstone resistance bridge.

These pressure transmitters are equipped with an electronic circuit fitted together with the sensor in a stainless steel housing. In

addition, the connecting cable contains a vent pipe which is equipped with a humidity filter to prevent the build-up of condensation.

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

The sensor, the electronics and the connecting cable are housed in an enclosure with small dimensions.

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

■Function

On one side of the sensor (1), the diaphragm (5) is exposed to the hydrostatic pressure which is proportional to the submersion

depth. This pressure is compared with atmospheric pressure.

Pressure compensation is carried out using the vent pipe (3) in the connecting cable. The vent pipe is equipped with a humidity

filter which prevents the build-up of condenstation in the vent pipe.

The hydrostatic pressure of the liquid column acts on the diaphragm of the sensor and transmits the pressure to the Wheatstone

resistance bridge in the sensor.

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

The protective conductor connection/equipotential bonding (4) is connected to the enclosure.

■Dimensional drawings

SITRANS LH100 pressure transmitter

Siemens level sensor 

Siemens pressure sensor