Liquisys M CCM223/253 Commissioning
Endress+Hauser 43
Flow monitoring in the sample stream
If the flow falls below 30 l/h or if sample flow through the CCA250 assembly fails
completely, this causes an alarm to be signaled when an INS proximity switch is connected.
This alarm becomes active when the switch-off delay time elapses (A4 field). The alarm is
canceled immediately as soon as the necessary rate of flow is restored. The device
automatically stops the dosing of chemicals and the Chemoclean cleaning function for the
duration of the alarm. All the relays assigned to the PID controller or to a cleaning function
go to the quiescent state. The NO contact closes in the case of the three-point step
controller. Dosing and cleaning actions are only resumed once the switch-on delay time
has elapsed (A5 field).
A0002018
30 Alarm signaling and dosing switch-off by the sample stream
A Flow in sample stream
B Relay contacts of PID controller
C NO contact on three-point step controller
D Alarm relay
E Flow < 30 l/h or flow failure
F Flow alarm
G Flow restored
0 Off
1 On
A4 Field A4 (controller switch-off delay)
A5 Field A5 (controller switch-on delay)
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