12E5119 Instruction Manual QuickTOC
®
ultra
IECEx 125
7 How to Work with the Analyser
7.8 Service
LAR | PROCESS ANALYSERS AG
4, 10, 12, 20.
6. If other values are displayed or values are skipped, contact LAR Technical Support (Chapter 15.1
on page 283).
7.8.5.2 Live-Zero-Feature
The Live Zero feature increases the detectability of analyser failures. The measured value zero is not
transmitted as a standard signal of size zero, but receives an offset (zero error). For current loops, this
offset is set to 4 mA. If a line break or a failure of the transmitter now occurs, a signal with 0 mA results,
but since the start of the measuring range is 4 mA, this failure or line break can be clearly detected. Usual
live zero standard signal: 4 - 20 mA.
With the live zero feature, this behavior can be used for error output / recognition.
Activate and program the live zero feature:
1. In the "Calibrate analogue outputs" display (Chapter 7.8.5 on page 124), click on the analogue out-
put in which the live zero feature is to be activated.
2. Set the function "Live Zero" to "ON".
3. To program the live zero feature, use the programming tools in Chapter 7.7.3.2 on page 110.
Fig. 87: Activate Live-Zero (Example)
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