Endress+Hauser Mycom CLM 152 User Manual

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7.1.2 Measuring Range Switching
The Mycom CLM 152 offers two alternatives for measuring range switching: Either
external measuring range switching or automatic internal measuring range switching with
conductivity mode.
Measuring range switching affects:
 Current output
 Limit settings
 Temperature compensation type
 Substance selection (with concentration measurement)
Remote Measuring Range Switching
Measuring range switching is affected by means of external contacts, e.g. of a PLC.
Expansion module FCXI is required. Up to four measuring ranges can be selected.
Measuring Range MR 1 MR 2 MR 3 MR 4
Contact state (1 x remote switching) 83/84 open closed  
Contact state (2 x remote switching) 81/82 open closed open closed
83/84 open open closed closed
Automatic Measuring Range Switching with Conductivity-Mode
The Mycom automatically switches to the next measuring range. The current measuring
range is signalled to the downstream evaluation unit via contacts 3 and 4. This function is
automatically activated during programming of contacts 3 and 4 as the MR switching
function (see chapter 7.1.2). This operating menu is also used to set the switching points
and their individual switching hystereses (LOW and HIGH values).
Example for automatic measuring range switching with four measuring ranges:
Settings for above example:
Trigger thresh. 1 Trigger thresh. 2 Trigger thresh. 3 Trigger thresh. 4
LOW value  80 µS/cm 1800 µS/cm 18 µS/cm
HIGH value 100 µS/cm 2000 µS/cm 20 µS/cm 
CD
(mS/cm)
20000
18000
2000
1800
100
80
MR 1
MR 2
MR 3
MR 4
Contact state
Contact 3
Contact 4
Off On
T
20
Figure 7.1
Example for measuring
range switching

Endress+Hauser Mycom CLM 152 Specifications

General

Brand	Endress+Hauser
Model	Mycom CLM 152
Category	Transmitter
Language	English