First, open the enclosing:
1.
Loosen both screws at the bottom side of the unit,
marked red in the image above.
2.
Inside the device is another screw that you need to
loosen. This is also marked red in the image above.
Now, change the battery.
1.
Carefully lift the board at the side opposing the sensor
cable.
2.
Use the screw driver to push the old battery out of its
socket from behind.
3.
Insert the new battery into the socket. If needed, gently
push it with the screw driver.
4.
Place the board back into the enclosing.
5.
Now tighten the screw in the enclosing, as well as both
screws at the bottom side of device.
Maintenance, tips and troubleshooting
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