Maintenance and cleaning, Faults 10. maintenance and cleaning / 11. faults – WIKA DIH62 Benutzerhandbuch
Seite 28
28
WIKA operating instructions models DIH50, DIH52, DIH62
GB
14008548.02 03/2012 GB/D
10. Maintenance and cleaning
10.1 Maintenance
The field indicators described here are maintenance-free.
The electronics are completely encapsulated and incorporate no components which could
be repaired or replaced.
Repairs must only be carried out by the manufacturer.
10.2 Cleaning
CAUTION!
■
Prior to cleaning, switch off and disconnect the instrument from the mains.
■
Clean the instrument with a moist cloth.
■
Electrical connections must not come into contact with moisture.
■
Wash or clean the dismounted instrument before returning it in order to protect
personnel and the environment from exposure to residual media.
For information on returning the instrument see chapter 12.2 "Return".
11. Faults
10. Maintenance and cleaning / 11. Faults
Fault-tree
l = 0 mA
Current loop disconnected
Voltage supply connected incorrectly
(wrong polarity)
Transmitter not connected
l > 20 mA
l < 4 mA
4 mA < l < 20 mA
but wrong values
Process temperature out of range
Sensor connected incorrectly
Sensor break or short circuit
Wrong transmitter configuration