Endress+Hauser Liquiline CM444 - Page 111

Liquiline CM442/CM444/CM448 Operation
Endress+Hauser 111
Redundancy
Use this function to monitor two or three sensors with redundant measurements. The
arithmetic average of the two closest measured values is calculated and output as the
redundancy value.
Path: Menu/Setup/Additional functions/Mathematical functions/MF 1 to 6/Mode/Redundancy
Function Options Info
Calculation Options
•Off
•On
Factory setting
Off
On/off switch for the function
Y1 The options depend on the
sensors connected
You can select different types of sensor that output the
same measured value.
Example for temperature redundancy:
You have a pH sensor and an oxygen sensor at inputs 1
and 2. Select both as "Y1" and "Y2". For "Measured value"
select the temperature.
Measured value
Y2
Measured value
Y3 (optional)
Measured value
Deviation control Options
•Off
•On
Factory setting
Off
You can monitor the redundancy. Specify an absolute
limit value that may not be exceeded.
Deviation limit Depends on the selected
measured value
Redundancy Read only View this value in a user-defined measuring screen or
output the value via the current output.