HON 638-EP

HON 638-EP

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HON 638-EP is a pilot pd min, pd max with electric/pneumatic loading pressure stage for gas pressure regulators with throttling diaphragm HON 402, HON 502, HON 503 and HON 505 according to DIN EN 334.

The pneumatic pressure control stages monitor the preset limit values. As soon as outlet pressure gets close to these limits during operation, the pneumatic pressure control stages take over and keep the pressure constant. The transition from electronic control to pneumatic control is done automatically and is operated smoothly in both directions.

The following operation modes may be realized between the two pressure limits:

Remote setpoint adjustment:
  • adaptation of setpoints due to frequently changing operating conditions

  • integration with process control systems


Flow control, optimising efficient gas supply

  • gas storage in networks and tanks

  • meter protection by means of actual flow limitation


Pressure control

  • meter protection by means of actual flow limitation

  • according to defined pressure curves throughout a day or week

  • to improve regulating accuracy and stability due to electronic PI or PID control


Features include: 
  • CE registration according to PED in combination with HON gas pressure regulators

  • According to DIN EN 334, the pilot is an integral component of this device

  • Maximum admissible pressure PS: 100 bar

  • Maximum inlet pressure pu max: up to 100 bar


Pilot HON 638-EP consists of functional modules on a common base plate:
  • 1st stage: automatic load-limiting stage

  • 2nd stage: pilot stage controlling the lower outlet pressure limit pd min

  • 3rd stage: pilot stage controlling the upper outlet pressure limit pd max

  • 4th stage: electro-pneumatic loading pressure stage converting electric signals into pneumatic signals

All mechanical components of this device are without potential ignition sources and/ or hot faces. They are not subject to ATEX 95 (94/9/EC). All electronic accessories, on the other hand, meet ATEX requirements.

Documentation
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System description of electro-pneumatic regulation with the pilot HON 638-EPGas pressure regulators with superimposed electronic control loopsBrochure1 Feb 2017
 
 
 
 
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