Tjernlund PS1503 Duct Airstat Positive Air Flow Pressure SwitchTjernlund PS1503 Duct Airstat Positive Air Flow Pressure Switch
Tjernlund PS1503 Duct Airstat Positive Air Flow Pressure Switch

Duct Airstat Positive Air Flow Pressure Switch


Brand: Tjernlund

Mfr Part#: PS1503

Availability: In Stock
Usually ships: within 1 business day
Qty Price
$32.95 / each
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Tjernlund PS1503 Duct Airstat senses positive pressure in a forced air heating and/or cooling system. The single pole, single throw, snap-acting switch is activated by a diaphragm with a factory installed sampling tube inserted directly into the duct or plenum.


The Tjernlund PS1503 Duct Airstat can be used to initiate such auxiliary devices as: Duct Boosters, Electronic Air Cleaners, Electrical Duct Heaters, and Humidifiers. The electrical contacts of the switch are closed upon sensing positive air pressure generated by the blower.


  • High Sensitivity;
  • Maximum Temperature Limit of 190F;
  • Simple Installation;
  • Self-Sealing Factory Mounted Sampling Tube;
  • Mounting Hardware;

Technical Specifications:

  • Electrical rating: 278 VA Pilot Duty at 24 Volts AC; 300 VA Pilot Duty at 115 to 277 Volts AC; 15 AMPS Non-Inductive to 277 Volts AC;
  • Electrical switch: SPST, N/O, Snap Action Contacts, Non Adjustable;
  • Operating pressure / position: On pressure rise at +.05 + .02" W.C. (Diaphragm Vertical);
  • Maximum pressure: 1/2 PSI;
  • Operating temperature range: -40 to 190F;
  • Sampling tube: Self-sealing, factory mounted tube;
  • Dimensions: 5" Diam., 5 1/2" Across Bracket, 3" High;
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Location: 5407 Foster Ave, Brooklyn, NY 11234