Pressure Alarm System Model: 9503

Primary Application: Indicates Low Supply Gas Pressure for Three Gases

  • To be used to alarm when there is low pressure supply gas to a Thermco three gas mixer
  • A horn and a light will energize when alarm is tripped
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Model 9503
Number of Gases 3
Alarm Setpoint Range
  • 20-120 PSIG (1.4-8.3 barg)
  • The 20-120 PSIG alarm setpoint range is standard. Higher alarm setpoint ranges are available on special order. Maximum inlet pressure is 250 PSIG (17.2 barg) for standard design.
Ambient and Supply Gas Operating Temperatures 2˚F to 122˚F (-17˚C to 50˚C)
Pressure Connections 1/8" female NPT
Power Requirements 115 VAC, 50/60 Hz. 0.5 amp. Available on request, 220 VAC, 50/60 Hz, 0.25 amp.
Lights Long life LED
Enclosure Painted steel enclosure, lockable. This enclosure is not suitable for outdoor service.
Weight 9.4 lbs. (4.3 kg)
Dimensions 11.5 in (29.2 cm) height, 10.5 in (26.7 cm) width, 5.0 in (12.7 cm) depth

Additional Information


The Pressure Alarm System is designed to indicate low inlet pressure in Thermco gas mixers built for three gases. The gases must be non-flammable and non-corrosive. If oxygen is used, the Pressure Alarm System must be ordered cleaned for oxygen service.


Improper use of this product can cause death, serious injury, or property damage. Personnel dealing with this equipment should read and understand warning labels and instruction manuals provided by Thermco. Only personnel familiar with industrial gases should attempt to install or service this equipment. Gases are under pressure and therefore the hazards associated with pressurized systems exist. Gases from high pressure cylinders must be reduced to the specified pressure before entering the equipment to prevent the possibility of equipment damage and personal injury.

Only use oxygen in gas mixers specifically designed for oxygen service. Gas mixers not designed for oxygen service cannot be converted to oxygen service.

Flammable, toxic, liquid or corrosive gases should not enter this equipment.

Ordering Information

Thermco Pressure Alarm Systems are available through many local industrial gas suppliers. Thermco Pressure Alarm Systems may also be ordered directly from the factory.