Pressure Measurement & Control


New pressure switch

January 2001 Pressure Measurement & Control

Endress+Hauser is offering the Cerebar T PMP 131, a pressure switch designed for measuring absolute and gauge pressures of gases, vapours and liquids.

The PMP 131 operates with a new switch output PNP transistor. The process pressure acting on the metallic, separating diaphragm of the sensor is transmitted to a resistance bridge via a fluid. A differential amplifier creates a standard signal from the pressure-proportional change in output voltage of the bridge. A comparator with an adjustable hysteresis compares this signal with the preset switch point and then activates the power amplifier and the LED. Extremely stable, the PMP 131 has finely graduated measuring ranges up to 400 bar (40 Mpa) or 6000 psi, up to four times overload resistance, electronic versions with analog output from 4 to 20 mA and the new switch output PNP transistor. The PMP 131 has also been approved for EEx ib IIC T6 power supply unit from Endress+Hauser. For the PMP 131 with switch output, both the switch on and switch off points are fully adjustable which means this can be carried out at normal pressure using a test lead and a voltmeter, with the potentiometer used for this adjustment located at the base of the plug.



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