RFA PneumaticRecording Temperature Control

This recorder is an accurate, sensitive pneumatic controller used in conjunction with an air-operated valve for control of steam, gas or fuel for combustion equipment or to operate other pneumatic devices. Requires approximately 16 psi input, air output is 3 to 15 psi, throttling span is 5% to 25% of scale range. Flush or wall mounted (brackets supplied) with 12 optional ranges from -30°F to 1100°F.
RFA Pneumatic Recording Temperature Control
Quick Specifications:
  • A one pen, 10" circular, chart temperature recording controller for use with pneumatic devices, providing proportional control in heating or cooling applications.
  • Available with 12, 24, or 48 hour, or 7 day rotation times for 125VAC, 60 Hz operation, and others.
  • Seventeen operating ranges covering -30ºF to 1100ºF.
  • Can be panel or surface mounted.
Read more for Mechanical Limits
  • Standard Features
  • Key Specifications
  • Industry/Application
  • Manual
Overview / Design Principle:
This recorder is an accurate, sensitive pneumatic controller used in conjunction with an air-operated valve for control of steam, gas or fuel for combustion equipment or to operate other pneumatic devices. Requires approximately 16 psi input, air output is 3 to 15 psi, throttling span is 5% to 25% of scale range. Flush or wall mounted (brackets supplied) with 12 optional ranges from -30°F to 1100°F.
Operation:
Operates in an adjustable throttling range of 5-25% of scale range. As the indicating pointer, moving up or down scale in response to the expansion or contraction in the thermal sensing element, enters the throttling range and approches set point, it changes the effective orifice in the instrument's bleed valve.

Depending upon its control action (reverse or direct acting) this increases or decreases the pressure delivered to the remotely-placed air operated control device.

Pressure transmitted by the control instrument is reflected by teh valve postition of the air-operated device which modulates the flow of heating or cooling medium.

Load error, inherent in throttling controls, is compensated by manual reset adjustment. Note: For long air line feeds, ie. 10 feet or greater, or large volume air valves or control devices, an air pressure booster relay is strongly recommended.
  • 13-1/2" W x 12-5/8" H
  • 15-1/8" W x 12-3/16" H x 4-7/8" D
  • 3 to 15 psi.
  • One 7/8" diameter hole on each side of the case for 1/2" conduit fitting; drill guide hole spotted in the rear of the case showing optional rear opening location.
  • Basic recording capability for diverse industrial heat and cooling applications
  • Mobile Refridgeration
RFA
 
5672 Bolsa Avenue Huntington Beach, CA 92649 - USA - Ph (714) 622-2000 - Fax (714) 622-2001