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A diaphragm logic pressure selector selects the highest/lowest branch pressure input from zone thermostats to operate final control elements in pneumatic control applications. Replacements available for Johnson, Powers, Robertshaw, and Barber-Colman.


  • Seven input manifold containing logic diaphragm, air filter, and restrictions.
  • Ten sharp barb connectors for all piping requirements.
  • Large integral filter assures clean air to the manifold.
  • Requires no field adjustment, and plastic construction results in minimum maintenance.
  • Two analyzers can be connected together to increase inputs to twelve.

Product Specifications

Load Analyzer Relay, 7 input
Airflow Usage
0.04 scfm (0.019 mL/s)
Dimensions (in.)
3/4 in. high x 6 1/2 in. long x 2 1/16 in. deep
Dimensions (mm)
19 mm high x 165 mm long x 52 mm deep
Maximum Safe Operating Pressure (psi)
25 psi, maximum
Maximum Safe Operating Pressure (kPa)
172 kPa, maximum
Temperature Range (F)
0 F to 140 F
Temperature Range (C)
-18 C to +60 C
Wall or In-line or panel
Operating Humidity Range (% RH)
5 to 95% RH
Air connections
Barb fittings (10) for 1/4 in. (6 mm) O.D. plastic tubing
0.039 scfm at 1 psi differential (18 mL/s at 5 kPa differential)
Selects highest and/or lowest branch pressure input to operate final control elements
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