Operation
Stamolys CA71CODcr
24
Hauser
Dilution factor
0.10 ... 100.00
1.00
If the sample is diluted externally between taking the
sample and the analyzer, the dilution factor has to be
entered here.
Rinse cycles
1
to 5
For cleaning the reactor and drawing in the sample for the
next measurement. Increase the number of rinse cycles if
the sample concentration fluctuates greatly.
Dilution
0.10 to 10.00
1.00
If the sample is diluted externally between taking the
sample and the analyzer, the dilution factor has to be
entered here.
Stripping time
1 to 30 min
10 min
During this time, any chloride in the sample is removed to
avoid incorrect measured values. Increase the stripping
time if chloride concentrations > 1g/l Cl
-
(chloride
precipitate in the reactor or excess COD).
Digestion time
10 to 180 min
120 min
You can shorten the digestion time for samples that are
easily digested. In such situations, check whether the
measurement results are correct by using comparison
measurements based on the standard method.
Accuracy mode
on
off
Accuracy mode="on"
The reactor is rinsed with pure water or 0 mg/l standard.
This increases the repeatability and accuracy of the
measurement.
Accuracy mode="off"
The reactor is rinsed with sample.
Analog output
0 to 20 mA /
4 to 20
mA
Selection for the measuring range scope. If the
concentration measuring range 0 to x mg/l O
2
, either 4
mA or 0 mA corresponds to 0 mg/l. The end of the
measuring range is the same in both cases at 20 mA.
Alarm value AV 1
NO
NC
Changes only take effect after a
reset (power off/on)!
Setting as to whether the contact for alarm value 1 works
as an NO or NC contact.
Alarm value AV 2
Setting as to whether the contact for alarm value 2 works
as an NO or NC contact.
Error contact
Setting as to whether the contact for the fault message
works as an NO or NC contact.
Current date/time
01.01.96 00:00 to 31.12.95 23:59
Setting the system clock.
Format DD.MM.YY hh:mm.
Calibrate offset
Yes / no
Frequency offset
1)
Pressing the
J
key starts blank value measurement for
compensating the reagent's inherent color.
Frequency offset
1)
COD-A
500 to 1500
1000
COD-B
0 to 500
200
Manually changing the frequency offset.
1)
Tank capacity
0 to 50 l
5.0 l
The volume entered must correspond to the volume of
the collecting tank for chromate waste. When the volume
entered is reached, an error is displayed ("Empty tank!").
This error can be canceled once the collecting tank has
been replaced (menu "Maintenance/Empty tank?").
1)
Redetermine the frequency offset and the calibration factor every time the reagents are changed or the photometer is replaced.
Menu item
Range of adjustment
(factory settings in bold)
Display
Info
Rinse cycles
1
Accuracy mode
off
Alarm val. 1
norm. closed
Alarm val. 2
norm. closed
f-Offset
[Hz]
1000
Tank capacity
5.0 l
