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One- or two-pipe, direct- or reverse-acting, low- or high-capacity controller used with pneumatic actuators in central fan installations. Replacement devices are available for Johnson, Powers, Robertshaw, Barber-Colman, and older Honeywell devices.


  • Adjustable setpoint and throttling range (Zero and span).
  • Direct Acting (DA) and Reverse Acting (RA).
  • Sharp-barb, push-on connectors for plastic tubing.
  • Field calibration possible.

Product Specifications

Static or Differential Pressure
Maximum Safe Operating Pressure (psi)
25 psi
Maximum Safe Operating Pressure (kPa)
170 kPa
Temperature Range (F)
40 F to 120 F
Temperature Range (C)
5 C to 50 C
Low capacity branchline pressure
Pressure Ratings (psi)
Maximum Safe Static Pressure-- 28 in. wc
Pressure Ratings (kPa)
Maximum Safe Static Pressure-- 7 kPa
Reverse Acting, Direct Acting
Number of Pipes
Mainline Pressure Range (psi)
16 to 25 psi
Mainline Pressure Range (kPa)
112 to 175 kPa
Throttling Range (in. wc)
0.06 to 0.5 in. wc (adjustable)
Setpoint Range (psi)
0 to ±8 in. wc (adjustable)
Setpoint Range (kPa)
0 to ±2 kPa (adjustable)
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