81
8024250/18HT/V2-0/2020-12| SICK
O P E R A T I N G I N S T R U C T I O N S | ZIRKOR200 Ex-G
Subject to change without notice
HEATING SHUTDOWN IN CASE OF MALFUNCTION
10
10
Heating shutdown in case of malfunction
10.1
General information
The temperature of the measuring probe is monitored by an additional electronic system
(Part No. 2105158) with two thermoelements. The electronics are designed to be fail-safe
(redundant). They automatically switch off the measuring probe heater when the operating
temperature of the measuring probe is exceeded. The switch-off temperature is 810 °C. In
addition, the heating is switched off in the event of a fault in one of the thermoelements.
The electronics go into self-holding mode, which means that if a fault occurs, the
electronics must be reset.
The error-free operating status is indicated by two green LEDs (
). The error case is indicated by three red LEDs.
In case of an error, the device must be reset manually. The position of the Reset button is
shown in the Figure,
see “Display and operating elements”, page 81
The reset can also be initiated by switching the power supply off and on again for at least
5 seconds.
Fig. 34: Display and operating elements
No.
Designation
Color
Description
1
LED 1
Red
Fault, temperature difference
2
LED 2
Red
Fault, temperature maximum channel 1
3
LED 3
Red
Fault, temperature maximum channel 2
4
LED 4
Green
Operation, channel 1
5
LED 5
Green
Operation, channel 2
6
Reset
