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The TH 134 Pneumatic High and Low Temperature Detection Thermostats have an internal pneumatic switch that exhausts air from the line to a controlled device when the temperature reaches the set point. They require manual reset to close the switch.

The pneumatic high and low temperature detection thermostats are used on pneumatic heating, cooling and air conditioning systems. These thermostats must be used in areas protected from the weather.

On a typical high temperature sensing application the thermostat shuts down air conditioning or ventilating fans when the duct temperature becomes excessively high. The low temperature detection thermostat stops a fan or closes a damper when the temperature at any one-foot or greater section of the sensing element drops to or below the set point.

  • Snap acting pneumatic switch - no leakage prior to opening
  • Easy to adjust settings
  • Normally closed 0.022- inch (0.6 mm) diameter restrictor air valve bleeds to less than 2 psig (13.8 kPa) when supplied with 20 psig (138 kPa) through 40 scim (11 ml/sec) restrictor when switch is open
  • Barbed fitting for push-on connection of 1/4-inch OD plastic tubing
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Manuals (1)
Control Type:
Low Temperature
Bulb Size:
Capillary Length:
Normally Closed
Temperature Range (F):
15°F to 55°F
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