Transmitters

WHAT ABOUT BATTERY LIFE?
The pendant and watch style transmitters are powered by lithium batteries which are not replaceable. Lithium batteries lose about 1% to 2% of their total capacity per year of shelf life and after 10 years should have 80% of their initial capacity less any discharge due to use. In the typical application the capacity for use is 100,000 operations of one second duration. The DW-101A auxiliary transmitter batteries can be changed. The life depends on whether the input circuit is N/O or N/C and how frequently the transmitter is activated. If the input sensor circuit is N/C (normally closed) or the reed switch is used, the maximum battery life is typically 3 to 5 years due to the current drain required to monitor the closed loop. When the input circuit is N/O and the reed switch is not used the life approaches the life of a pendant (10 yrs +) for seldom activated applications. The initial capacity is 50,000 activations (25,000 in supervised mode).

HOW DO I KNOW WHEN THE BATTERY IS LOW?
Each transmitter sends a battery status every time it is activated to the receiver. The 811LX, 902L, 904L, and 601A (6CHAN-1) receivers/decoders have a low battery output which is activated if the transmitter sends a "LOW BATTERY" condition.