Instrumentation

Pin type pressure Transmitter

In this lesson, we will study a pin-type pressure transmitter.

Pin-type pressure Transmitter

  • Piezo-resistive sensor
  • A piezo-resistive sensor has a far more complex structure than the sensors described above. The sensor element is made of a silicon chip. This chip consists of a diaphragm, structured with piezoresistive resistors, which deflects under pressure. The chip has a surface area of only a few square millimeters and is thus much smaller than, for example, the diaphragms of metal thin-film or ceramic thick-film sensors.
  • The piezo chip is very susceptible to environmental influences and, therefore, must be hermetically encapsulated in most cases For this reason it is installed into a stainless steel case that is sealed using a thin flush stainless-steel diaphragm. The free volume between the piezo chip and the (external) diaphragm is filled with transmission fluid. Synthetic oil is usually used for this. In an en-capsulated piezo-resistive sensor, the pressure medium is only in contact with the stainless- steel diaphragm, which then transmits the pressure through the oil to the (internal) chip’s diaphragm.

pin type pressure transmitter
pin type pressure transmitter

    A pin-type pressure transmitter has standardized interfaces, both on the process side and on the electrical output signal side, and converts the physical pressure value to a standard industrial signal. The pressure connection is used to lead the pressure directly onto the sensor. It has a (standardized) thread and an integrated sealing system to enable easy connection of the pressure transmitter simply by screwing it in at the relevant measuring point. A suitable case protects the sensor and the electronics against environmental influences. The electronics transform a  sensor signal into a standardized signal; e.g. the common industrial signal of 4- 20 m Amp. The output signal is transmitted via a (standardized) plug or cable for sub-sequent signal evaluation.

Supply for pin type pressure transmitter is 24 V DC

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