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Switzer Instrument introduces pressure switch

EM NEWS BUREAU ,  Friday, August 19, 2011, 17:16 Hrs  [IST]

Untitled - 12.jpgSwitzer Instrument Ltd, Chennai, has introduced the most advanced electronic digital pressure switch for the Indian market. SWITZER Model 711 electronic pressure switch is a versatile electronic instrument matching with contemporary designs with all the fundamentally required features for basic control functions.

The instrument is provided with LCD indication, two independent set point On-Off control relay outputs and analog output of 4 to 20mA. Operational settings are done through three keys on the front keypad.

The stainless steel pressure sensor and wetted parts are compatible for both liquids and gases. Two relay switching outputs, with independent time delay settings, have status indication LEDs on front of the instrument. Both set-point and dead-band can be set throughout the calibrated range.

The instrument is weatherproof to IP65 and operates with DC power supply. The external electrical connections are through two polarized and lockable plug-in connectors.

The primary pressure sensing element for the detection is a stainless steel diaphragm on which piezo-resistive elements are configured in a bridge form. When the diaphragm is subjected to a pressure, the stress produces a strain on the deposited bridge to give an electrical output when excited. The sensor is temperature compensated to ensure minimal drift with ambient and process temperature changes.

The sensor output signal is suitably conditioned to generate the necessary signal and is fed to a A-to-D convertor to convert it to digital signal compatible to a micro-controller.

This digital signal is processed to provide output for process pressure display on LCD, output to relay for onoff control and output as 4-20mA analog current.

The key features of the product are:
  • Pressure range from 0 to 1 bar to 350 bar
  • Piezo-resistive stainless steel pressure sensor
  • Accuracy of +/-0.3% of full scale
  • Operating power of 20 to 30VDC
  • Display of 1x8 dot matrix LCD with yellow green backlight
  • Choice of 5 units - bar, psi, Kg/sq.cm, KPa, MPa
  • Analog transmitter output of 4 to 20mA
  • 2 set-points are provided with independent on-off relay contacts
  • Time delay option up to 250 secs
 
                 
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