C
HAPTER
3
I
NSTALLATION AND
C
OMMISSIONING
P
AGE
25
3.4
Connection of relay outputs
Exceeded limit
→ relay REL1
terminals 7 / 8 / 9
Signal devices and valves can be switched on when the limit is exceeded. The
relay switches as permanent contact or impulse contact to trigger a control system
for the regeneration of a water treatment plant.
Using the prog
ram switches S4 and S5 (→ page 33) to set different functions for
the relay REL1.
1. Impulse contact
→ 3 seconds
2. Impulse contact
→ 60 seconds
3. Permanent contact
→ without interruption of analysis
→ Alarm auto-quit.
-the left red LED flashes until reset-button is pressed.
→ Further analyses will be carried out during the selected interval.
4. Permanent contact
→ with analysis stop
→ The alarm is active and must be quit manually
the left red LED flashes until reset-button is pressed
→ No further analyses will be carried out at the selected intervals until the
alarm is reset.
Malfunction
→ relay REL2
terminal 10 / 11 / 12
Relay REL2 signals malfunctions. It is normally closed in case of no malfunction.
The following faults are signalled:
Power failure
→ unit is switched off (relay drops)
Lack of reagent
→ content of reagent bottle is lower than app. 10%
refer to page 18:
BOB-operation
Zero transmission error
→ insufficient brightness before the addition of reagent
•
pollution of measuring chamber
•
pollution of water sample or turbidity effects
•
malfunction of electronic
Measurement error
→ insufficient difference of measured value before and after addition of
reagent
•
no reagent was dosed
•
no water in measuring chamber
•
no homogenisation (magnetic stirrer misses or agitator failure)
Analysis process
→ relay REL 3
terminals 13 / 14 / 15
Signal devices and valves can be connected. The relay switches during the
analysis.
The taking of a sample can be delayed by means of
the rotary switch ‘Delay time’.
It can thereby be ensured that, if a sample cooler is installed, the sample has time
to cool before it is introduced to the measuring-chamber.