Tristate to Pneumatic Transducer

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Tristate to Pneumatic Transducer

EP-321 accepts a tristate input and provides an output pressure pulse train with a field adjustable pulse width and interval.


As a result, any triac or contact closure can be converted into a desired actuator travel. By adjusting the pulse width and interval, the actuator travel time can be field programmed from as low as five seconds to 25 seconds based on system volume. The EP-321 can operate over 0–20 psig pressure range and has negligible input/output differential.



  • Accepts universal 24 VAC/VDC triac or dry contact input
  • Universal 24 VAC/VDC supply voltage
  • High air flow capacity
  • Field adjustable pulse width and interval
  • Field programmable travel time
  • Compensates for system volume and leaks
  • Precision pressure gauge for branch line indication
  • Conforms to EMC and RoHS standards
  • Five installation options—probe with mounting flange or bulkhead fitting, plastic, galvanized steel, or NEMA-4 / IP-65 steel enclosure offer the industry's most extensive range to satisfy all HVAC, appliance and industrial applications.
  • 304 SS thin wall probe with a cold rolled hermetically sealed end forms a monolithic encapsulation cavity for the sensor and is immune to failures caused by high humidity, contamination, thermal shock and vibration.
  • The flat probe end provides a large thermally sensitive area and the sensor is in direct thermal contact to this surface. As a result, extremely fast response is achieved to changes in temperature.
  • Probe is attached to the enclosure or the flange using a patented process to provide a rugged, reliable and low profile attachment for ease of installation.
  • More than 16 types of interchangeable NTC thermistors, precision platinum, nickel or balco RTDs are available for universal compatibility.

This is Section 2.

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