Model 233

Air Flow Switch Alarm

The Model 233 Air Flow Switch is designed to detect the loss of airflow in a mine shaft.  When mounted near the mine fan, the Model 233 will detect air stoppages due to the loss of power, mechanical breakdown or cave-in.  Only one simple moving part, it can be connected to an alarm reporting device (such as our Model 630/631 Multiguard or Model 248 Monitor/Alarm) that will accept a switch closure as an alarm condition.  Switch contacts are rated at 110 VAC, 10 watt.

  • Normally closed contacts.
  • Stainless steel tube.
  • .5 amp switch contacts.
  • Hermetically sealed switch.
  • Easy to install.

Warranty on the Model 233 covers defects in parts and workmanship for a period of ninety (90) days.  Modifications to this unit or usage of unauthorized replacement parts will totally void any and all warranty, service and liability responsibility implied, expressed or written.