Sentry ST312A Instruction Manual page 9

Refrigerant leak detector
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4-3.Charging the Lithium Battery
The detector will automatically turn off if the battery capacity is too low, charging it
when the LOW-BATT LED is lit.
It is highly recommended not to use the detector during charging, the battery may be
heated and dangerous.
The CHARGING LED be lit red color during charging, it will turn to green when
charging is completed.
Note: Always charge within the charging environment specifications of 32°F~113°F
(0°C~45°C), less than 80% RH.
The lithium battery is charged with AC power via AC adapter and USB cable:
(AC adapter/charger is not include)
1. Use the AC adapter and plug mini B male into the mini B receptacle of the unit
(Fig. 1).
2. Plug the AC adapter to the wall jack (Fig. 2).
3. Use the USB cable plug mini B receptacle of the unit and plug A male into PC or
Notebook USB port (Fig. 3).

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