ProMinent DULCOTEST DT1B User manual

DULCOTEST® DT1B
Photometer
Operating manual
A0943
EN
Target group: instructed personnelPart number 985629 BA DT 057 03/17 EN
Please carefully read these operating instructions before use. · Do not discard.
The operator shall be liable for any damage caused by installation or operating errors.
The latest version of the operating instructions are available on our homepage.

General non-discriminatory approach In order to make it easier to read, this
document uses the male form in
grammatical structures but with an
implied neutral sense. It is aimed
equally at both men and women. We
kindly ask female readers for their
understanding in this simplification of
the text.
Supplementary information
Please read the supplementary information in its entirety.
Information
This provides important information relating to the correct operation of the
unit or is intended to make your work easier.
Warning information
Warning information include detailed descriptions of the hazardous situation.
The following symbols are used to highlight instructions, links, lists, results and
other elements in this document:
More symbols
Symbol Description
Action, step by step.
⇨Outcome of an action.
Links to elements or sections of these instructions or other
applicable documents.
nList without set order.
Supplemental directives
2

Symbol Description
[Button] Display element (e.g. indicators).
Operating element (e.g. button, switch).
„Display /
GUI“
Screen elements (e.g. buttons, assignment of function keys).
CODE Presentation of software elements and/or texts.
Supplemental directives
3

Table of contents
1 General Information................................................................................... 5
1.1 Scope of delivery............................................................................... 6
1.2 Instructions for use............................................................................ 8
1.3 Adapter for 16 mm cuvettes............................................................. 11
1.4 Operations carried out on the device............................................... 12
2 Commissioning DT 1B............................................................................. 13
2.1 Commissioning................................................................................ 13
3 Operating Menu....................................................................................... 17
3.1 Operating Menu Options.................................................................. 17
3.2 Operating instructions...................................................................... 18
3.3 Error messages............................................................................... 18
4 Analysis methods..................................................................................... 20
4.1 Procedure instructions when using liquid reagents......................... 20
4.2 Quantitative determination using liquid reagents............................. 22
4.3 Procedure instructions when using tablets...................................... 29
4.4 Quantitative determination using tablets.......................................... 31
5 Calibration ............................................................................................... 44
6 Technical Data......................................................................................... 47
7 Consumables and Spare Parts................................................................ 49
8 Standards Complied with and Declaration of Conformity........................ 50
9 Index........................................................................................................ 51
Table of contents
4

1 General Information
WARNING!
Danger from hazardous sub‐
stances!
Possible consequence: Fatal or
very serious injuries.
Please ensure when handling
hazardous substances that you
have read the latest safety data
sheets provided by the manu‐
facture of the hazardous sub‐
stance. The actions required
are described in the safety data
sheet. Check the safety data
sheet regularly and replace, if
necessary, as the hazard
potential of a substance can be
re-evaluated at any time based
on new findings.
The system operator is respon‐
sible for ensuring that these
safety data sheets are available
and that they are kept up to
date, as well as for producing
an associated hazard assess‐
ment for the workstations
affected.
General Information
5

1.1 Scope of delivery
The following components are included as standard:
Description Quan‐
tity
nCase, blue with blue fasteners
– with ProMinent sticker, Photometer Dulcotest DT1B, code
1039315
– and hazard symbol
1
Foam insert for the case 1
Cover foam for the case 1
nPhotometer DT1B
– Chlorine, bromine, chlorine dioxide, ozone, pH, CyA
– Battery compartment lid with O-ring
1
Screwdriver with clip, red 1
Countersunk screws 4
Batteries, 1.5 V alkali-manganese, type AA 4
Round cuvettes, 10 ml, d = 24 mm, h = 48 mm 3
Lid for round cuvette, 24 mm, grey 3
Sealing rings for cuvettes, grey 3
Round cuvettes, d = 16 mm, h = 90 mm 3
Lid for round cuvette, 16 mm, white 3
Adapter attachment, grey for 16 mm cuvettes 1
Syringe, 10 ml 1
Plastic mixing rod, 13 cm long 1
Cleaning brush 1
Operating instructions for Dulcotest DT1B 1
DPD -1 tablets 100
General Information
6

Description Quan‐
tity
DPD -3 tablets 100
PHENOLRED PHOTOMETER tablets 100
CyA TEST tablets 100
CHLORINE HR (KI) tablets 100
ACIDIFYING GP tablets 100
Glycine tablets 20
General Information
7

1.2 Instructions for use
– Request the safety data sheets.
– Reagents are intended for chemical analysis and access to them by
unauthorised persons must not be permitted.
– You must dispose of reagent solutions properly.
– Observe the application possibilities, analysis instruction and matrix
effects of the methods.
1. You must thoroughly clean the cuvettes, lids and stirring rod after each
analysis to avoid carry-over errors.
Even slight reagent residue can lead to incorrect measurement results.
For cleaning use the supplied brush.
If the fully reacted water sample is left for any length of time it may pro‐
duce stubborn coloured deposits, which you can remove using dilute (=
4 %) hydrochloric acid.
2. The outer walls of the cuvettes must be clean and dry before the analysis
is carried out. Fingerprints or water droplets on the light-entry surfaces of
the cuvette will result in faulty measurements. The cuvette should there‐
fore be wiped clean with a soft paper tissue (paper handkerchief) before
carrying out the measurement.
3. The zero correction and the analysis must both be carried out using the
same cuvette, as the cuvettes may have slightly varying tolerances.
General Information
8

A0937
Fig. 1: Cuvette positioning (Ø 24 mm):
I. Seal
II. Marking with the white triangle
4. For the zero correction and test, the cuvette must be positioned in the
sample chamber in such a way that the marking with the white triangle (II.)
points towards the housing marking.
5. You must carry out the zero correction and test with the cuvette lid closed.
You must provide the cuvette lid with a sealing ring (I.) to prevent the
entrance of light into the sample chamber.
6. Formation of bubbles on the inside walls of the cuvette will result in faulty
measurements. Should this happen, seal the cuvette with the cuvette lid
and tip it back and forth to dissolve/remove the bubbles before carrying
out the test.
General Information
9

7. It is important to prevent water getting into the sample chamber because
this leads to incorrect measurement results.
8. Dirt in the transparent sample chamber leads to incorrect measurement
results. The light entry surfaces should be checked at regular intervals and
cleaned as necessary.
Standard spectacle cleaning cloths and cotton buds are suitable for
cleaning.
9. Pronounced differences in temperature between the photometer and the
surroundings can lead to incorrect measurements, e.g. due to the forma‐
tion of condensation in the sample chamber and on the cuvette.
10. Protect the device from direct sunlight.
A0938
Fig. 2: Correct filling of the cuvette: Left = correct / right = incorrect
11. Fill the cuvette as shown in Fig. 2.
12. Insert the reagent tablets directly from the blister pack into the water
sample, without touching them with your fingers.
13. After use immediately close the dropping bottles containing the liquid
reagents by closing them with the screw caps of the same colour.
14. You must observe the sequence for the addition of reagents without fail.
General Information
10

1.3 Adapter for 16 mm cuvettes
A0941
Fig. 3: Place the adapter for 16 mm cuvettes on the sample chamber
Insert the adapter for the 16 mm cuvette as shown in Fig. 3.
This adapter is required for all analysis methods which must be carried out using
a 16 mm cuvette.
General Information
11

1.4 Operations carried out on the device
Battery replacement:
To ensure complete leak-tightness of the photometer, you must insert the
gasket (2) and screw on the battery compartment lid (1).
If the battery is removed for more than 1 minute from the device, then
when the device is switched on again with new inserted batteries, the
date/time program appears automatically.
A0939
Fig. 4: Battery replacement
1. Battery compartment cover
2. Seal
3. Screw
4. Batteries
5. Rear of the device
General Information
12

2 Commissioning DT 1B
2.1 Commissioning
Switching on and zero correction
Scroll memory (SM)
With multi-parameter devices
the sequence of the various
methods is specified. After
switching on the device, the
method which was last selected
before the device was switched
off is automatically displayed.
This permits rapid access to a
favoured method.
1. Switch the device on using the
[ON/OFF] key
ðThe display outputs: The
last selected [METHOD] .
2. Select the [METHOD] using the
[MODE] key
ðThe display outputs:
[METHOD] .
Zero correction
3. Fill the cuvette up to the 10-ml
marking with the water sample,
see Fig. 2
4. Close the cuvette using the cuv‐
ette lid
5. Position the cuvette in the
sample chamber
ðObserve the correct posi‐
tioning of the cuvette.
6. Press the key [ZERO/TEST]
ð
[METHOD] flashes for
approximately 8 seconds.
[0.0.0] appears in the dis‐
play.
7. Remove the cuvette from the
sample chamber
ðZero correction is ended.
Analysis
8. Fill the cuvette up to the 10-ml
marking with the water sample,
see Fig. 2
9. Add reagents to the water
sample
ðThe characteristic colouring
develops.
10. Close the cuvette using the cuv‐
ette lid
11. Position the cuvette in the
sample chamber
12. Press the [ZERO/TEST] key, in
so doing adhere to any possibly
required reaction time, see
Ä „
Switching the countdown func‐
tion on“ on page 14
ð
[METHOD] flashes for
approximately 3 seconds.
The result is output to the
display.
Commissioning DT 1B
13

The result is automat‐
ically saved.
Repeating the analysis
Press the key [ZERO/TEST]
again
ðThe process runs as
described here Ä „Switching
on and zero correc‐
tion“ on page 13 .
New zero correction
Press the key [ZERO/TEST] for
2 seconds
ðThe process runs as
described here Ä „Switching
on and zero correc‐
tion“ on page 13 .
Switching the countdown function on
NOTICE!
If reaction times are not
observed, the result may be
incorrect measurement results.
The countdown can only be
activated directly prior to a
measurement.
The countdown time equals 2
minutes and is non-adjustable.
The currently running count‐
down can be ended by
pressing the key [ZERO/TEST].
The measurement then takes
place immediately.
For methods with a reaction time, you
can optionally switch on a countdown
function:
1. Press the key [!] and then keep
the key depressed
2. Press the key [ZERO/TEST]
3. Release the [!] key
ðThe countdown starts After
the countdown has elapsed
(2 minutes), measurement
takes place automatically
Commissioning DT 1B
14

Displaying stored data
The device has a ring buffer for 16 data records.
Fig. 5: Displaying stored data
1. Data record (n01 ... n16)
2. Year
3. Month/day
4. Time
5. Measured variable (e.g. chlorine,
dependent upon the device ver‐
sion)
6. Value in mg/l
1. With the device switched on press the [!] key for more than 4 seconds then
release the key again
ðThe display immediately switches to the memory menu.
2. Press the [MODE] key to scroll through the 16 data records
3. Press the [ZERO/TEST] key to scroll through the values of a data record
4. Press the [!] key to return to the [METHOD] display
Commissioning DT 1B
15

Display background lighting
Press the [!] key
ðThe display's background lighting switches on or off.
During measuring the background lighting switches off automati‐
cally.
Commissioning DT 1B
16

3 Operating Menu
3.1 Operating Menu Options
Operating menu selection
1. The device is switched off.
Press and hold down the
[MODE] key
2. Use the [ON/OFF] key to switch
on the device
ð3 decimal points appear in
the display.
3. Release the [MODE] key
4. The [!] key allows you to select
the following operating menu
items:
n
[diS] = read out of stored
data
nSet date and time
nUser adjustment
ðThe selected operating
menu item is indicated by an
arrow in the display.
5. Use the [!] key to select the „Set
date and time“ operating menu
item (arrow at top right and
bottom left in the display)
Setting date and time (24-hour
format)
Increase the value to be set by
pressing the [MODE] key.
Lower the value to be set by
pressing the [ZERO/TEST] key.
Pressing the [!] key takes you
to the next value to be set.
1. Press the [MODE] key
ðThe parameter to be set
appears for 2 seconds.
2. Enter the year [YYYY]
3. Enter the month [MM]
4. Enter the day [dd]
5. Enter the hour [hh]
6. Enter the minutes [mm] .
Enter the minutes in 10 minute
increments
Press the [!] key
Enter minutes in 1 minute incre‐
ments
7. After setting the minutes, press
the [!] key
ð
[IS SET] appears in the dis‐
play and the device auto‐
matically returns to meas‐
uring mode.
Operating Menu
17

3.2 Operating instructions
Display Meaning
Hi Measuring range exceeded or turbidity too
high.
Lo Measuring range undershot.
Change the batteries immediately, continuing
work impossible.
btLo Battery voltage for background lighting too low,
although measurement is possible.
A1856
With a method adjusted by the user, when the
result is shown in the display, an arrow appears
in the [Cal] position.
3.3 Error messages
Display Meaning
E 27/ E 28/
E 29
Light absorption too great. Cause e.g. dirty optics.
E 10 / E 11 Calibration factor outside the permissible range.
E 20 / E 21 Detector receives too much light.
E 23 / E24 /
E 25
Detector receives too much light.
E 22 The battery power was too low during the measurement.
Replace the battery.
E 70 Cl: Factory calibration not OK / deleted
E 71 Cl: User calibration not OK / deleted
E 72 Cl HR factory calibration not in order / deleted
E 73 Cl HR user calibration not OK / deleted
Operating Menu
18

Display Meaning
E 80 pH: Factory calibration not OK / deleted
E 81 pH: User calibration not OK / deleted
E 82 CyA: Factory calibration not OK / deleted
E 83 CyA: User calibration not OK / deleted
Operating Menu
19

4 Analysis methods
4.1 Procedure instructions when
using liquid reagents
When calculating non-directly
determinable parameters from
individual measured values
error propagation based on the
possible tolerances of the indi‐
vidual methods must be consid‐
ered.
1. Cleaning the cuvettes Many
domestic cleaning agents con‐
tain reducing substances. Use
of these substances leads to
false low readings when meas‐
uring chlorine/bromine/chlorine
dioxide/ozone. To exclude this
measurement error, the cuv‐
ettes must not contain any sub‐
stances that have a chlorine
demand. Therefore the cuvettes
must be stored in a sodium
hypochlorite solution (0.1 g/l) for
one hour and then thoroughly
rinsed with deionised water.
2. For the relevant specification of
free chlorine and total chlorine
use a separate set of cuvettes
for each determination (see EN
ISO 7393-2, section. 5.3).
Label the cuvettes set on
the top and bottom so
that inadvertent inter‐
changing of the cuvettes
is not possible.
3. When preparing water samples
you must avoid the outgassing
of chlorine/bromine/chlorine
dioxide/ozone, e.g. by pipetting
and shaking. This applies partic‐
ularly for the dissolved gases
chlorine dioxide and ozone,
especially at temperatures >
30 °C. You must carry out the
analysis immediately after
taking the water sample.
4. The DPD colour development
takes place at a pH-value of 6.2
to 6.5. Therefore the reagents
contain a buffer for pH value
adjustment. You must ensure
strongly alkaline or acidic water
samples come within a pH
range between 6 and 7 (using
0.5 mol/l sulphuric acid solution
or 1 mol/l sodium hydroxide sol‐
ution).
5. Concentrations above the
measuring range with ...
n4 mg/l chlorine when using
liquid reagents
n9 mg/l bromine when using
liquid reagents
Analysis methods
20