Product category:
Monitoring and sensor equipment and systems
News Release from: SensorsOne | Subject: Pressure transducer module
Edited by the Manufacturingtalk Editorial
Team on 15 December 2006
Pressure transducer module has no pcb
The Gefran PMH pressure transducer module has no pcb fitted to pre-condition the pressure output signal, so design engineers will benefit from the natural characteristics of silicon strain gauges.
OEM manufacturers of measurement instrumentation that require a pressure sensor in their product will often choose to integrate the signal conditioning within their own electronics This enables the manufacturer to use a pressure transducer that has no signal conditioner or compensation electronics fitted
This article was originally published on Manufacturingtalk on 29 May 2006 at 8.00am (UK)
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The Gefran PMH pressure transducer module has no pcb fitted to pre-condition the pressure output signal, and as a result the design engineer will benefit from the natural characteristics of silicon strain gauges which have inherently good pressure hysteresis and short term repeatability due to the excellent elasticity of silicon chip diaphragms.
Also, since there is no conditioning electronics, the OEM design engineers are free to exploit the high natural frequency response that characteristic of semiconductor sensing elements.
The PMH pressure sensor capsule which houses the silicon sensing diaphragm is oil filled and made from stainless steel 316L.
Further reading
Industrial pressure transmitters are in stock
Universal industrial pressure transmitters have DIN plug electrical connection, G1/4 B pressure connection, 0.5% full scale accuracy, 4-20mA current or 0-5V signal output.
Pressure transmitters get plug-in display
A TDP Loop powered plug-in display for pressure transmitters has an easily readable four digit LED display which can be configured to read in any pressure units and will trigger alarms.
A thin isolation membrane enables the pressure to be transmitted through the oil to the measurement sensor and provides the environmental barrier protecting the electrical connections to the silicon chip.
The pressure transducer is designed for use with a constant current power source which helps keep the thermal errors to a minimum.
Due to the high repeatability and stability of the PMH pressure sensor header it is possible to enhance the accuracy using a digital signal conditioner.
Digital characterisation is carried out by mapping the pressure sensor over pressure and temperature.
The recorded data is then processed mathematically to derive a polynomial equation that describes the behaviour of the pressure transducer.
The polynomial equation coefficients are stored inside the measurement instruments memory and used to digitally improve the accuracy of the pressure transducer output signal.
The Gefran PMH pressure sensor has pressure ranges from 250 mb up to 30 bar gauge.
To enable the engineer to design their own electrical interface bare solder pins exit from the back of the pressure sensor capsule which are either soldered directly to a PCB, flexi film wire or individual insulated wires.
An NBR or Silicone seated O-ring provides a piston seal around the outside diameter of the flush diaphragm pressure sensing capsule which allows a mechanical engineer to integrate their own pressure connection without extending the length unnecessarily with threaded pressure adaptors.
Measuring 19 mm in diameter and 10 mm in height the Gefran PMH pressure transducers offers manufacturers of pressure sensors and measurement instruments a compact and high performance building block for their pressure sensing development projects.
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