Liquisys M CLM223/253 Commissioning
Endress+Hauser 47
6.4.6 Check
The CHECK function group is only available for devices with a Plus Package.
In the CHECK function group, you can select different monitoring functions for the
measurement:
Polarisation detection (field P1)
Polarization effects in the interface between sensor and measuring solution limit the
measuring range of conductive conductivity sensors. The transmitter has the ability to detect
polarization effects using an intelligent evaluation process. Error code E071 will be
generated.
Alarm threshold monitoring (fields P2 to P5)
You can use this function to monitor the measured value for permissible upper and lower
limits and trigger an alarm (E154, E155).
PCS alarm (Process Check System), (fields P6 to P9)
AC (Alternating Check): The function AC (field P6) is used to check measuring signals for
deviations. If the measuring signal change within an hour is smaller than 0.5% (of full scale
value of the selected measuring range), an alarm (E152) is triggered. The reason for such
sensor behaviour can be contamination, cable rupture or similar.
CC (Controller Check): You can monitor the controller activity with the function CC. This
function is mainly used for batch processes and single-sided limit switches. A malfunction
of the controller is detected and reported thanks to freely adjustable monitoring times (E156
- E157).
a0006744
Fig. 28: PCS alarm (live check)
A Constant measuring signal = alarm triggered after PCS alarm time has elapsed
Any PCS alarm pending is automatically deleted as soon as the sensor signal changes.
F8
Automatic cleaning
function start
no
yes
This field is not available for certain errors,
see "Trouble-shooting and fault
elimination" section.
F9
Select return to
menu or next error
next = next error
R
If R is selected, you return to F, if next is
selected, you go to F5.
Coding Field Setting range
(Factory settings, bold)
Display Info
To Next Page
Loading...
