Maintenance - Nokeval FT10 Series Manual

Cleaning
The plastic parts can be cleaned with a soft cloth and soap water. Cleaning with isopropyl alcohol is also
allowed.
When cleaning with liquids make sure that the transmitter and measuring modules are properly
connected together to prevent liquids from entering the enclosures.
Battery
General
FT10 series devices are powered by a single 1.5 V size AA alkaline battery. The battery comes preinstalled
inside the measuring module. The measuring module is in a low-power inactive state as long as it is not
connected to the transmitter module. When the modules are connected together, the measuring module
wakes up and begins to provide power to the transmitter module. If the modules are separated again, the
measuring module immediately returns to the low-power state to conserve battery power.
Endurance
Battery life time depends on the used transmit interval. Ambient temperature also has an effect on the
achievable battery life, which will be significantly shorter in extremely cold and very hot environments. The
following graph gives a rough estimate of battery life with different transmit intervals. It should be noted
that with long transmit intervals, the estimated battery life approaches the typical shelf-life of alkaline
batteries. Thus also the age and quality of the battery affect the resulting battery life time.
Replacing the battery
It is rarely necessary to replace the battery because of its long life and because it's always replaced as part
of the factory recalibration procedure. However, the battery is user replaceable but it should be done very
carefully. To replace the battery, follow these steps:
1. Detach the measuring module from the transmitter module
2. Have a medium size flat-bladed (if possible, not too sharp) screwdriver at hand

Maintenance

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