MST Electronic Filter Life Timer
The MST model 8022801 Electronic Filter Life Timer is designed to monitor your replacement filter element frequency in your MST Breathing Air Purification System. When pressure to MST Breathing Air Filter/Purification System reaches 12 PSIG or greater the timer will start; the timer will stop timing below this pressure. The MST Electronic Filter Life Timer consists of a miniature pressure switch connected to a continuous reading digital timer. The timer will continuously count to 999999-9 (hours - tenths) at which time, the display will return to zeros. The timer contains a non-replaceable lithium battery.