CM3 Pressure Monitor - Specification - Optional Battery Pack 

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The CM3 unit can be fitted with an internal battery pack to provide battery backup on mains failure or to allow remote operation. The reference for the unit with the battery fitted is CM3-50B. The battery is a 7.2V 1500mAh Nickel metal hydride rechargeable unit. As well as the battery the CM3-50B is fitted with a charging circuit and a control switch.

The control switch has two functions. With no mains supply connected the switch functions as an on-off switch to allow the CM3 to be operated for up to 8 hours. With a mains supply connected an the switch in the on position the battery will supply the CM3 for up to 8 hours on mains failure. When the mains supply connected and the switch in the on position the battery will be automatically recharged. The LEDs next to the switch show which supply is present.