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5.3 Current input

This function group offers two independent application solutions, provided that the current

output of an external measured quantity, e.g. flow meter, is connected to the 4 … 20 mA input

of Liquisys M CPM 223 / 253. The following assignments then apply:

5.3.1 Monitoring the flow rate in the main stream

This arrangement is highly practical when the sample stream flowing through the flow assembly

(e.g. CPA 250) is totally independent of the flow rate in the main stream. This permits the

signalling of an alarm state in the main stream (flow rate too low or totally stopped) and trigger a

dosing switch-off, even if the measuring water stream is retained due to the installation

configuration.

Flow in

main stream

Flow alarm

Flow below

switch-off limit Z4

or flow failure

Flow

restored

Alarm relay

Relay contacts

of PID controller

OFF

see field Z2 see field Z3

Fig. 5.4

Alarm signalling and

dosing switch-off by the

main stream

Flow in

main stream

Current signal

in mA

Current input

signal in %

Lower range limit

current input

Lower setting value

flow meter

Upper range limit

current input

Upper setting value

flow meter

20 100

PM253E5A.CHP

Liquisys M CPM 223 / 253 Instrument configuration

Endress+Hauser 27

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