Maintenance; Maintaining The Gas-Net Q1 Evaluation Computer - Elster gas-lab Q1 Technical Documentation Manual

Maintenance

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9 Maintenance
The gas-lab measuring system, consisting of the evaluation computer and
sensor system, does not require much maintenance.

9.1 Maintaining the gas-net Q1 evaluation computer

9.1.1 Battery replacement
When maintaining the device, check whether the internal RAM battery has to be
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replaced. For this, a device internal elapsed-hour meter is used as indicator.
The period of time during which the backup battery has supplied the energy is
calculated by subtracting the operating hours supplied by the power supply from
the total operating time in hours.
A battery life of 45 000 hours is guaranteed. However, the battery must be
replaced after 10 years at the latest. The battery should be replaced when a
reserve of less than 20 000 hours at the beginning of the maintenance period is
is remaining. In addition: The battery must be replaced after 10 years at the
latest.
If the RAM battery must be replaced, this should only be executed by a service
engineer or trained expert for safety reasons.
For replacement of the battery, it is necessary to open the housing of the gas-
net device. For open an officially sealed housing the presence of an officially
authorized person might be required.
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The elapsed hour meter is part of the main display of the System module.
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