WIKA DI25 - Handbuch (Seite 31)

31 WIKA operating instructions digital indicator, model DI25
14076218.01 12/2013 GB/D
GB
7. Maintenance and cleaning / 8. Faults
7. Maintenance and cleaning
7.1 Maintenance
This instrument is maintenance-free.
Repairs must only be carried out by the manufacturer.
7.2 Cleaning
CAUTION!
■ Prior to cleaning, disconnect the instrument from the mains.
■ Clean the instrument with a moist cloth.
■ Electrical connections must not come into contact with moisture.
For information on returning the instrument see chapter 9.2 “Return”.
8. Faults
In the event of any faults, first check whether the digital indicator is mounted correctly,
mechanically and electrically.
Faults Reasons / measures
Flasching on the PV display: Sensor burnout with input configuration of thermocouple, resistance thermom-
eter or voltage signal (DC 0 ... 1 V). Check the correct connection of the sensor
to the connection terminals and the connecting wires.
The measuring input is checked as follows:
Thermocouple
To check, short-circuit the connection terminals 18 and 19 of the digital indica-
tor.
If the digital indicator displays a temperature approximately equal to the current
room temperature, the input of the digital indicator is OK and there is a fault in
the sensor.
Resistance thermometer
To check, connect a 100 Ω resistor to the terminals 18 (A) and 19 (B) and
short-circuit the terminals 19 (B) and 20 (B). If the digital indicator displays a
temperature of approximately 0 °C (32 °F), the input of the digital indicator is
OK and there is a fault in the sensor.
Voltage input (DC 0 ... 1 V)
To check, close the circuit of the connection terminals 18 and 19 of the digital
indicator. If the digital indicator displays the scaled start value, the input of the
digital indicator is OK and there is a fault in the sensor.
If there is a fault in the connected sensor, replace the faulty sensor.