4.1 Operating elements
The protective cover houses two keys and a rotary switch.
Keys Depending on the position of the rotary switch, the left key switches the individual
functions on or off or assigns values to a particular function (see Table 5.1).
Depending on the position of the rotary switch, the right key carries out the
calibrations when the probe is uncovered or covered.
Rotary switch The rotary switch has eight positions. The symbols on the inside of the protective
cover serve as a quick guide and are also given in Table 5.1 along with their
meanings and switch positions.
4.2 Display elements
LED chain The protective cover houses a chain of 5 LEDs. This chain shows the settings of the
instrument (see Table 5.1).
Green LED The green LED indicates stand-by.
Red LED The red LED indicates the switching status (seeTable 6.1/Page 36).
Switching status Function
Green LED does not light up Power supply failure or switched off.
Green LED lights up
The power supply is switched on.
The instrument is on stand-by.
Table 4.1
Function of the green LED
Switching status
Function
DC version AC version
Red LED does not light up
Switching output is
connected or power supply
failure.
Relays energised or
power supply failure.
Red LED lights up Switching output is blocked. Relays de-energised.
Red LED flashes
RESET carried out = all parameters are set to factory values.
No calibration carried out.
Instrument not operating as limit switch.
Table 4.2
Function of the red LED
4 Operation Elektronic insert FEC 22
30 Endress+Hauser
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