16
LRG 1x-6x - Installation & Operating Manual -
819878-00
Function
The following information is transferred as data telegrams:
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■
Measured value of the conductivity, temperature-compensated
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■
The temperature of the medium
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■
MAX limit value setting limiter
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Temperature coefficient (tC) and cell constant (CF)
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■
Limiter test command
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Status and fault information
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◆
Alarm signals from the conductivity electrode if the limit values are exceeded
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◆
Error messages in the event of faults in electronic or mechanical parts
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◆
Temperature in the terminal box of the conductivity electrode
Displays and signals; see page 49 / 54*
The LRG 1x-6x conductivity electrodes have a 4-digit green 7-segment display for showing measured
value and status information as well as fault codes. Several coloured LEDs are used to display alarm
states and the set unit.
Behaviour in the event of alarms *
The alarm state for an exceeded limit value is shown on the display as “
Hi.C
” alternately with the
actual
value
of the conductivity.
The alarm is transferred to the URS 60 or URS 61 safety control unit via CAN data telegram. Once the time
delay has elapsed, the alarm signal triggers the safety shutoff in the safety control unit. The URS 60 or
URS 61 safety control unit does not lock automatically for this.
The LEDs 1 and 4 signal the corresponding MAX alarm case see page 51 .
The safety circuit is interrupted without a delay if the following faults occur:
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■
Fault in the sensors (open circuit, short circuit, faulty component, excessive temperature)
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■
Communication failure
Behaviour in the event of faults *
The safety functions of the equipment are monitored in the sensors through periodic self-tests. Fault
messages are updated with each self-test and are permanently stored in the fault memory. If there are no
faults, only the list of current faults and their display is deleted.
Alarm and fault signals are indicated by LEDs and shown on the 7-segment display of the conductivity
electrodes and are transferred to the URS 60/URS 61 safety control unit via CAN data telegram.
Electrode alarms and errors faults cannot be acknowledged.
When the alarm or error is cancelled the display also goes blank, and the URS 60/URS 61
safety control unit closes the safety contacts again.