Installation | 4
Instruction Manual VACTEST TPP900_EN_en 7 / 24
4.3 Electrical Connection
4.3.1 Battery Operation
Before operating the gauge a suitable battery or rechargeable battery must be inserted.
• Pull the battery cover on the back of the unit downwards and insert the battery
• Close the cover again by pushing it upwards until it snaps into position.
Battery types:
– 9 Volt AlMn block battery type 6LR 61; lifetime max. 40 hours
– 9 Volt Lithium block battery; lifetime max. 100 hours.
NOTICE
Inferior or damage batteries may leak gas or liquid under vacuum.
Risk of damage to the gauge!
• If it is intended to expose the entire gauge to vacuum, seek confirmation from the
battery supplier that the battery is vacuum proof.
NOTE
Poor battery power is indicated by the ‘’BAT’’-prompt in the upper left corner of the dis-
play. Operation of the gauge is still possible. Once the battery is completely discharged,
the gauge switches off.
Rechargeable batteries have to be removed for charging. Please use suitable, commer-
cially available chargers.
4.3.2 Operation with External Power Supply
The gauge can be operated alternatively with an external 12V power supply. The socket
for the power supply is located behind the dust protection lid.
• Open the lid carefully and pull it out slightly.
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