Operation Liquiline CM44P
126 Endress+Hauser
5. Connect the valve or pump.
10.6.6 Measuring range switching
A measuring range switching (MRS) configuration includes the following options for each
of the four binary input states:
• Operating mode (conductivity or concentration)
• Concentration table
• Temperature compensation
• Current output turndown
• Limit switch range
An MRS set is assigned to a channel and switched on. The measuring range configuration
selected via the binary inputs is now applied instead of the normal configuration of the
linked sensor channel. For current outputs and limit switches to be controlled by the MRS,
they must be linked to the MRS set, not to the measuring channel.
Current outputs and limit switches can be linked to an MRS set. This MRS set gives you the
measured value and the associated turn down (current outputs) or the range for limit
value monitoring (limit switches).
A limit switch connected to an MRS set always uses the Out of range checkmode.
Consequently, it switches when the value is outside the configured range.
If a current output or limit switch is connected to an MRS set, the turndown, monitoring
range and limit switch mode can no longer be configured manually. Therefore, these
options are hidden in the menus (current outputs and limit switch).
Programming example: CIP cleaning in a brewery
Beer Water Alkali Acid
Binary input 1 0 0 1 1
Binary input 1 0 1 0 1
Measuring
range 00
Measuring
range 01
Measuring
range 10
Measuring
range 11
Operating mode Conductivity Conductivity Concentration Concentration
Conc. Table - - NaOH 0..15% User table 1
Compensation User table 1 Linear - -
Current output
Range lower value 1.00 mS/cm 0.1 mS/cm 0.50 % 0.50 %
Range upper value 3.00 mS/cm 0.8 mS/cm 5.00 % 1.50 %
Limit switches
Range lower value 2.3 mS/cm 0.5 mS/cm 2.00 % 1.30 %
Range upper value 2.5 mS/cm 0.7 mS/cm 2.10 % 1.40 %
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