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Instruction Manual
1
Technical description
1.1
Application
The SITRANS P transmitter measures the pressure of non-aggressive and
aggressive gases, vapours and liquids. Measuring spans of between 0.23 and
160 bar are possible.
The output signal is a load-independent direct current from 4 to 20 mA that is
linearly proportional to the input pressure.
Transmitters belonging to the "intrinsically safe type of protection" type and
featuring a flameproof enclosure can be installed in explosion hazard areas. In
this respect, the corresponding EC prototype test certificate must be observed.
Transmitters fitted with various types of chemical seal are available for special
applications, e.g. measuring highly viscous media.
1.2
How it works
Pressure is transmitted to a silicon pressure sensor and its measuring diaphragm
via the diaphragm (Figure 1) and its liquid filling. The resistance of four doped
piezo-resistors in a bridge circuit in the measuring diaphragm changes. This
change in resistance generates an output voltage in the bridge circuit that is pro-
portional to the measured pressure. This voltage is converted via a measuring
amplifier and a 4 to 20 mA current driver into a direct current of 4 to 20 mA that is
proportional to the pressure.
Transmitters with a measuring span of ≤ 63 bar measure the input pressure
against atmosphere, whereas those with spans of 160 bar measure against
vacuum.
The start of scale and full scale are set by means of potentiometers and jumpers.
The unit can be additionally attenuated by way of a jumper.
SITRANS P, MK II
C73000-B5674-C100-02
7MF4010
47
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