English (GB)
13
User calibration
Procedure:
• Prepare a standard reagent of known concentration and use
this reagent instead of the sample according to the test
procedure.
• It is recommend to use well known standard reagents which
are formulated according to DIN EN, ASTM or other
international standards, or to use certified reagents that are
commercially available.
• After measuring this standard solution, it is possible to change
the displayed results to the required value (see below).
• Only the simple form of differentiated methods can be
calibrated. For the "Chlorine" method, the variant "free" has to
be chosen among the possibilities "differentiated", "free" and
"total".
• Some methods cannot be calibrated. They are calibrated
indirectly via the basic method. See the table below.
Consequences:
• If a test method is user-calibrated the method name is
displayed inverted.
• User calibration of the basic method "Chlorine free" influences
all other DPD methods (tablets and liquid reagents).
See the table below.
• In methods such as "chlorine dioxide in the presence of
chlorine", the calibration of the basic method influences the
chlorine dioxide value as well as the chlorine value.
• In differentiated methods such as "chlorine (diff., free, total)",
user calibration of the variant "free" also influences the other
determinations of this method (in this example differentiated
and total chlorine).
Return to factory calibration:
If the user calibration is deleted, the factory calibration is
activated automatically.
Note:
The "Fluoride" method cannot be calibrated with mode 45 since
the test requires a specific calibration. See section
).
Overview
Store user calibration
Delete user calibration
This chapter only applies to methods which can be user-
calibrated.
No
Method
Recommended range for user
calibration
40
Aluminium T
0.1 - 0.2 mg/l Al
80
Bromine T
calibration via basic method
100 Chlorine, free
100 Chlorine T
0.5 - 1.5 mg/l Cl
2
120 Chlorine dioxide T
calibration via basic method
100 Chlorine, free
90
Chloride T
10 - 20 mg/l Cl
2
160 CyA-TEST T
30 - 60 mg/l CyA (cyanuric acid)
220 Iron T
0.3 - 0.7 mg/l Fe
170 Fluoride L
calibration with 0 and 1 mg/l F via
Mode 40
240 Manganese T
1 - 2 mg/l Mn
300 Ozone (DPD) T
calibration via basic method
100 Chlorine, free
330 pH value T
7.6 - 8.0
320 Phosphate LR T
1 - 3 mg/l PO
4
20
Acid demand K
S 4.3
T 1 - 3 mmol/l
210 Hydrogen peroxide T
calibration via basic method
100 Chlorine, free
Perform the test as described in the
respective method using a standard reagent
of known concentration.
Press the [Mode] key.
Press the [Shift] and [4][5] keys.
Confirm with the
key.
This display appears.
To increase the displayed result, press the
arrow key once.
To decrease the displayed result, press the
arrow key once.
Press keys until the displayed result
corresponds to the value of the standard
reagent.
To store the new calibration factor, press the
key.
To cancel the user calibration without storing
a new factor, press the [Esc] key.
This display appears.
Now the method name is displayed inverted
and the test result is calculated with the new
calibration factor.
Select the required method.
When the Zero query appears, press the
[Mode] key instead of zeroing the
photometer.
Press the [Shift] and [4][6] keys.
Confirm with the
key.
This display appears.
To delete user calibration, press the [Shift]
and [1] keys.
To keep the valid user calibration,
press the [Shift] and [0] keys.
The photometer returns automatically to the
Zero query.
Shift
<User calibration>
100 Chlorine T
0.02-6 mg/l Cl2
0.90 mg/l free Cl2
5
Mode
4
100 Chlorine T
0.02-6 mg/l Cl2
0.90 mg/l free Cl2
save:
down:
up:
Jus Factor
saved
100 Chlorine T
0.02-6 mg/l Cl2
1.00 mg/l free Cl2
Shift
<User calibration>
100 Chlorine T
0.02-6 mg/l Cl2
clear user calibration?
YES: 1, NO: 0
6
Mode
4
100 Chlorine T
0.02-6 mg/l Cl2
prepare Zero
press ZERO
1
0
Summary of Contents for DIT-M
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