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LIMIT VALUES
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Limit val. 2: 0.50 mg/l
LIMIT VAL. 1: 1.20 mg/l
Time setting
Internal flushing
To ensure that the analysed sample represents the current value, the sampling line must be sufficiently flushed. If the
plant has been out of operation for a longer period or in the case of long analysis intervals, we recommend you to
select a flushing time greater than 60 seconds. Flushing starts by simultaneously opening the inlet and the outlet valve
of the Testomat
®
2000 SO
3
2-
.
Example:
For connections longer than 3 m and with an internal hose diameter of 6 mm a minimum internal
flushing time of 10 seconds is required to ensure that a valid sample is taken from the sampling line. The required
quantity of flush water for 1-minute internal flushing is 0.5 litres.
☞
The analysis interval depends directly on the programmed flushing time. If, e.g., a flushing time of 60 seconds
has been set, the actual analysis interval cannot be less than 60 seconds.
External flushing
If very short analysis intervals are required, or if a very long (several metres) sampling line or a line with a large
diameter are used, an external flush valve should be installed upstream of the Testomat
®
2000 SO
3
2-
. The external
flush valve has to be connected to the "Flush” outlet. The external flushing time for the valve depends, just as the
flushing time for unit flushing does, on the length and diameter of the supply line to the Testomat
®
2000 SO
3
2-
.
Interval pause
If the analysis is triggered via a timer, the interval between two analyses (plus flushing time) is determined by the
interval pause. The shortest interval can be 0 minutes. In this case, analyses are carried out continuously. The longest
interval is 99 minutes.
Limit value monitoring
It is possible to program the limit values on a continuous scale. The limit value range
depends on the used reagent type and the programmed unit.
Example:
Number of measuring points
1
2
Function LV1
1, 2 or 3 exceeds upper
limit value
upper LV
Measuring
point 1
1., 2. or 3 exceeds upper
limit value
Function LV2
1., 2. or 3 exceeds upper
limit value
lower LV
Measuring
point 2
1., 2. or 3 exceeds upper
limit value
Two limit value outputs are available for monitoring. The functions of these outputs can be programmed independently
of each other.
Two limit values:
1 LV1 = Limit value 1
2 LV2 = Limit value 2
Two measuring points:
1 LV1 = Measuring point 1
2 LV2 = Measuring point 2
If the limit value
LV1
has been exceeded, the limit value control display
LV1
lights up
RED
and the relay output
LV1
reacts as programmed in the switch function. If this limit value has not been exceeded, the display lights up
GREEN.
The same applies for the limit value
LV2
.
If the unit is used for monitoring two limit values,
the limit value outputs are permanently allocated
to these limit values!
If the unit is used for monitoring two measuring
points, the limit value outputs are permanenty
allocated to these measuring points!
