C
HAPTER
4
O
PERATION AND
U
SE
P
AGE
35
►
input function
The input ‘IN’ can be assigned to two different functions:
flow monitoring function:
This function is used if an analysis is to be started when
a water sample is taken. It is particularly useful for plants that require sporadic tests
(e.g. when filling storage containers at long time intervals).
This function is also used when an analysis is not required (e.g. during the
regeneration of a filtration plant).
→ NB. Contacts to terminals 16 / 17 must always be potential free.
→ Any other contact source can be used with these terminals.
→ The unit is delivered with terminals 16 / 17 bridged. The flow monitor function is
therefore disabled.
►
start function
With this setting, you configure the operating mode of the input contact.
Application 1: Analyses are to be carried out continually at pre-set time
intervals.
In this case, the switch S10 is OFF (works setting). The IN terminals 16 &17 should
be bridged.
Application 2: Analyses will be carried out at fixed time intervals if a flow-
monitor registers flowing water.
The switch S10 is in the OFF position. The flow-monitor is connected to terminals 16
& 17 in place of the bridge. The first analysis takes place 3 minutes after switching on
the unit even when the flow-monitor has not detected any water flow. Thereafter, the
analyses are carried out at the pre-set intervals only when the flow-monitor registers
water flow.
Application 3: The analysis is started by an external controller.
In order to control the analysis intervals from a controller, the controller must be
connected to terminals 16 & 17. The switch S10 must be set to ON in order to
deactivate the unit’s internal intervals. If the switches S1 & S2 are set to OFF, no
interval controlled analyses will take place. Otherwise, the intervals 10, 20, and 30
minutes for the settings of both switches apply.
Input function
‘IN’
S10
Function
OFF
Flow monitor
No analysis when contact
open
ON
Start function
Analysis start when
contact closed
ON
1
2
3
4
5
6
7
9
8
10 11 12
OFF
ON
1
2
3
4
5
6
7
9
8
10 11 12
OFF
NOTE