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MODE OF OPERATION
s
st
t
M E
External (START)
Volume interval
TIME-CONTROLLED
*
DISPLAY OF UNIT Cl
s
st
t
M E
Display in ppm
DISPLAY IN mg/l
*
4, 5, 6
7
8
3
2
2
1
Function characteristics
Mode of operation
(analysis controller)
1.
Time control:
Internal triggering by a timer. The shortest interval = 0
minutes between analyses, longest interval = 99 minutes.
(see page 12, interval periods)
L
The analysis interval is determined by the duration of the supplementary
program AUX, the set flush times (internal and external), the programmed
pause (interval) and the duration of the analysis. The analysis duration is a
direct
function of the value to be measured.
2. Quantity control:
Triggered by the water meter.
Minimum interval = 1 litre, maximum interval = 9999 litres.
After the programmed water quantity is measured, the analysis is carried
out. Prior to the analysis, the capillary and the measuring chamber are
flushed (observe the programmed flush times).
3. External analysis
start
via contact “
Start
” input
L
The current analysis interval can be interrupted by making contact at the
"
Stop
" input.
Analysis cycle
(example with schematic cycle diagram)
1
Supplementary program AUX before analysis
2
Flush branch line and measuring chamber (note flush time of the sampling
line), T
SE
and T
SI
3
Fill measuring chamber
4, 5 Check the sample for dirtiness (stirring mechanism is "ON"),
Chlorine:
Measure out reagents: 12 x reagent A, 5 x reagent B
and 2 x reagent C, then a reaction time of 2 minutes
Residual hardness:
Measure out indicator (titration)
6
Evaluate and display reaction (approx. 1 minute)
7
Drain measuring chamber
8
Pause period up to the next analysis (time or quantity analysis interval), Tp.
T
I
= total analysis interval, ch = measuring chamber
Displayed unit
It is possible to program the units of the displayed value.
You have the choice of
°dH, °f, ppm CaCO
3
and mmol/l for the residual hardness and mg/l und ppm for
the chlorine.
All the following inputs and displays will then be displayed in the
programmed unit.
Measuring points switch-over
The Testomat 2000 THCl enables the monitoring of 2 measuring points. The measuring points switch-over occurs
automatically, but
can be suppressed by a contact at input IN1.
The active status of IN1 should be programmed correspondingly.
The parameters are assigned to the measuring points:
Measuring point 1 = Residual hardness
Measuring point 2 = Total chlorine
IN1 active = Measurements only from measuring point 1
