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Heat-Prober
Platinum-RTD Thermometers User Manual
2.4 The Batteries
The 392HP, 392E, 392EX, 392M, and 392MX Heat-Prober are powered with five size AA
rechargeable nickel-cadmium batteries, 1.2 volts each. The total capacity is 650 milliampere
hours at 6.0 volts.
The display demands the largest power drain. Depending on the number of digits being
displayed, the batteries can power the instrument for a minimum of 5 hours or for as long as 8
hours.
The 392EVX and 392VX meter utilizes an LCD type display to conserve battery life. Battery life
is in excess of 50 hours of continuous use.
SPECIAL NOTE: Rechargeable batteries should be kept at full charge. On the shelf, they will
gradually discharge, losing about 10% per week. If the battery fails to respond to recharge,
provisions have been made for ease of replacement. Open the back cover, and disconnect from
the instrument by means of the Molex connector. Replace with Wahl Model Number 11681-1 or
11681-2 (See Figure 2-2). Model 392EVX and 392VX incorporates a LCD display and a
standard 9V battery capable of 50 hours continuous operation.
2.4.1 Recharging
To recharge the batteries, use the recharger supplied. Plug in directly to 115VAC, 60 cycle wall
plug and insert jack into socket on left side of Heat-Prober. (For overseas 220-volt lines, use a
Franzus converter adapter with the recharger supplied or request a 220 volt recharger.)
2.4.2 Continuous Operation
The 392HP, 392E, 392EX, 392M, and 392MX, Heat-Prober can be continuously operated by
using a battery recharger to restore or recharge the batteries as rapidly as they are depleted.
392HP will operate in this manner, but over time the battery may be depleted and the Low Batt
icon will illuminate. The unit may still be operational, but should be turned off to charge the
battery fully prior to using without the charger.
NOTE: The instrument cannot rectify AC current. A DC charger with open circuit voltage of 9.0
volts and approximately 120 milliamperes will maintain the battery charge. This occurs when the
switch is on and the instrument is operating. Do not connect a voltage source to the batteries
unless its current is limited to 120 milliamperes.
The MA-150 recharger will charge the batteries with the switch "OFF", or make-up battery drain
if the instrument is operating. The recharger supplied with the instrument will enable continuous
operation without draining the batteries.
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