Liquiline CM442/CM444/CM448 Operation
Endress+Hauser 115
10.6.5 Measuring range switch
A measuring range switching (MRS) configuration includes the following options for each of the
four binary input states:
• Mode of operation (conductivity or concentration)
• Concentration table
• Temperature compensation
• Current output turndown
• Limit contactor range
If an MRS set is assigned to a channel and MRS is enabled for this set, the measuring range
configuration selected via the binary inputs is used instead of the normal configuration of the
linked sensor channel. So that the current outputs and limit contactors are controlled by the
MRS, these must be linked with the MRS set, not with the measuring channel.
Current outputs and limit contactors that are connected to an MRS set receive the measured
value corresponding to the mode of operation as well as the corresponding turndown or range
for limit value monitoring. A limit contactor connected to an MRS set always uses the "Out of
range check" mode, i.e. it switches if the value is outside the configured range. If a current output
or limit contactor is connected to an MRS set, the turndown, monitoring range and limit
contactor mode can no longer be configured manually. Therefore, these options are hidden in
the current output menu and limit contactor menu.
Example: CIP cleaning in a brewery
Beer Water Base Acid
Binary input 1 0011
Binary input 1 0101
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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