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DULCOTEST® DT2CPhotometer

Operating manual

A0944

Target group: instructed personnelPart number 985619 BA DT 036 02/12 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!

Technical changes reserved.

985619, 1, en_GB

© 2012

ProMinent Dosiertechnik Heidelberg GmbHIm Schuhmachergewann 5 - 1169123 HeidelbergTelephone: +49 6221 842-0Fax: +49 6221 842-419email: [email protected]: www.prominent.com

2

General non-discriminatory approachIn order to make it easier to read, thisdocument uses the male form ingrammatical structures but with animplied neutral sense. It is aimedequally at both men and women. Wekindly ask female readers for theirunderstanding in this simplification ofthe text.

Supplementary informationPlease read the supplementary infor‐mation in its entirety.The following are highlighted sepa‐rately in the document:n Enumerated lists

Instructions

ð Outcome of the instructions

Information

This provides important informa‐tion relating to the correct opera‐tion of the device or is intended tomake your work easier.

Safety informationThe safety information includesdetailed descriptions of the hazardoussituation.

Supplemental instructions

3

Table of contents1 General information................................................................................... 5

1.1 Scope of supply................................................................................. 61.2 Instructions for use............................................................................ 81.3 Operations carried out on the device............................................... 11

2 DT2 commissioning................................................................................. 122.1 Commissioning................................................................................ 122.2 Note on the analysis method [fluoride]............................................ 15

3 Operating Menu....................................................................................... 163.1 Operating menu options.................................................................. 163.2 Operating instructions...................................................................... 173.3 Error messages............................................................................... 17

4 Analysis method...................................................................................... 184.1 Procedure instructions when using liquid reagents......................... 184.2 Quantitative determination using liquid reagents............................. 204.3 Procedure instructions when using tablets...................................... 254.4 Quantitative determination using tablets.......................................... 27

5 Calibration................................................................................................ 326 Technical data......................................................................................... 367 Consumables and spare parts................................................................. 388 Standards complied with and conformity declaration.............................. 399 Index........................................................................................................ 40

Table of contents

4

1 General information

WARNING!Danger from hazardous sub‐stances!Possible consequence: Fatal orvery serious injuries.Please ensure when handlinghazardous substances that youhave read the latest safety datasheets provided by the manufac‐ture of the hazardous substance.The actions required aredescribed in the safety data sheet.Check the safety data sheet regu‐larly and replace, if necessary, asthe hazard potential of a sub‐stance can be re-evaluated at anytime based on new findings.The system operator is respon‐sible for ensuring that these safetydata sheets are available and thatthey are kept up to date, as wellas for producing an associatedhazard assessment for the work‐stations affected.

General information

5

1.1 Scope of supplyThe following components are included as standard:

Description Quan‐tity

n Case, blue with blue fasteners– with ProMinent sticker, Dulcotest DT2C photometer, code

1039316– and danger symbol

1

Foam insert for the case 1

Cover foam for the case 1

n Photometer DT2C– Chlorine, chlorine dioxide, fluoride– 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 6

Lid for round cuvette, 24 mm, grey 6

Sealing rings, grey 6

Syringe, 2 ml 1

Syringe, 10 ml 1

Plastic mixing rod, 10 cm long 1

Cleaning brush 1

Operating instructions for Dulcotest DT2C 1

DPD-1 buffer, 15 ml bottle, blue 1

DPD-1 reagent, 15 ml bottle, green 1

DPD-3 solution, 15 ml bottle, red 1

General information

6

Description Quan‐tity

Separately packed:

SPADNS reagent, 250 ml 1

Calibration standard 1 mg/l fluoride, 30 ml 1

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 eachanalysis 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 analysisis carried out. Fingerprints or water droplets on the light-entry surfaces ofthe cuvette will result in faulty measurements. The cuvette should there‐fore be wiped clean with a soft paper tissue (paper handkerchief) beforecarrying out the measurement.

3. The zero correction and the analysis must both be carried out using thesame cuvette, as the cuvettes may have slightly varying tolerances.

General information

8

A0937

Fig. 1: Cuvette positioning (Ø 24 mm):I. SealII. Marking with the white triangle4. 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 theentrance of light into the sample chamber.

6. Formation of bubbles on the inside walls of the cuvette will result in faultymeasurements. Should this happen, seal the cuvette with the cuvette lidand tip it back and forth to dissolve/remove the bubbles before carryingout the test.

General information

9

7. It is important to prevent water getting into the sample chamber becausethis leads to incorrect measurement results.

8. Dirt in the transparent sample chamber leads to incorrect measurementresults. The light entry surfaces should be checked at regular intervals andcleaned as necessary.Standard spectacle cleaning cloths and cotton buds are suitable forcleaning.

9. Pronounced differences in temperature between the photometer and thesurroundings 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 = incorrect11. 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 Operations carried out on the deviceBattery replacement:

To ensure complete leak-tightness of the photometer, you must insert thegasket (2) and screw on the battery compartment lid (1).If the battery is removed for more than 1 minute from the device, then whenthe device is switched on again with new inserted batteries, the date/timeprogram appears automatically.

A0939

Fig. 3: Battery replacement1. Battery compartment cover2. Seal3. Screw

4. Batteries5. Rear of the device

General information

11

2 DT2 commissioning2.1 CommissioningSwitching on and zero correction

Scroll memory (SM)With multi-parameter devices thesequence of the various methodsis specified. After switching on thedevice, the method which was lastselected before the device wasswitched off is automatically dis‐played. This permits rapid accessto a favoured method.

1. Switch the device on using the[ON/OFF] key

ð The display outputs: Thelast selected [METHOD].

2. Select the [METHOD] using the[MODE] key

ð The display outputs:[METHOD].

Zero correction3. 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 thesample chamber

ð Observe the correct posi‐tioning of the cuvette.

6. Press the key [ZERO/TEST]

ð [METHOD] flashes forapproximately 8 seconds.[0.0.0] appears in the dis‐play.

7. Remove the cuvette from thesample chamber

ð Zero correction is ended.

Analysis8. Fill the cuvette up to the 10-ml

marking with the water sample,see Fig. 2

9. Add reagents to the watersample

ð The characteristic colouringdevelops.



12. Press the [ZERO/TEST] key, inso doing adhere to any possiblyrequired reaction time, seeÄ ‘ Switching the countdownfunction on’ on page 13ð [METHOD] flashes for

approximately 3 seconds.The result is output to thedisplay.

DT2 commissioning

12

The result is automati‐cally saved.

Repeating the analysisPress the key [ZERO/TEST]again

ð The process runs asdescribed here Ä ‘Switchingon and zero correction’ on page 12.

New zero correctionPress the key [ZERO/TEST] for2 seconds

ð The process runs asdescribed here Ä ‘Switchingon and zero correction’ on page 12.

Switching the countdown function on

NOTICE!If reaction times are not observed,the result may be incorrect meas‐urement results.

The countdown can only be acti‐vated directly prior to a measure‐ment.The countdown time equals 2minutes and is non-adjustable.The currently running countdowncan be ended by pressing the key[ZERO/TEST]. The measurementthen takes place immediately.

For methods with a reaction time, youcan optionally switch on a countdownfunction:1. Press the key [!] and then keep

the key depressed2. Press the key [ZERO/TEST]3. Release the [!] key

ð The countdown starts Afterthe countdown has elapsed(2 minutes), measurementtakes place automatically

DT2 commissioning

13

Displaying stored dataThe device has a ring buffer for 16 data records.

Fig. 4: Displaying stored data1. Data record (n01 ... n16)2. Year3. Month/day

4. Time5. 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 thenrelease the key again

ð The display immediately switches to the memory menu.

2. Press the [MODE] key to scroll through the 16 data records3. Press the [ZERO/TEST] key to scroll through the values of a data record4. Press the [!] key to return to the [METHOD] display

DT2 commissioning

14

Display background lightingPress the [!] key

ð The display's background lighting switches on or off.

During measuring the background lighting switches off automati‐cally.

2.2 Note on the analysis method[fluoride]

Batch number of theSPADNS reagent solutionBefore initial commissioning a cal‐ibration of the [fluoride] analysismethod must be carried out (see[fluoride] calibration mode).[SPADNS] reagent solution fromthe same batch number must beused for calibration and samplemeasurement. The device mustbe recalibrated for each new[SPADNS] batch number.

DT2 commissioning

15

3 Operating Menu3.1 Operating menu optionsOperating menu selection1. The device is switched off Press

the [MODE] key and then keepit depressed


ð 3 decimal points appear inthe display.

3. Release the [MODE] key4. The [!] key provides you with the

following selection of operatingmenu items.n [diS] = read out of stored

datan Setting of date and timen User calibration

ð The selected operatingmenu item is indicated toyou by an arrow in the dis‐play.

5. Using key [!] select the oper‐ating menu item ‘Setting of dateand time’ (arrow upper right andbottom left in the display)

Setting date and time (24 h format)

Increase the value to be set bypressing the [MODE] key.Reduce the value to be set bypressing the [ZERO/TEST] key.By pressing the key [!] you canaccess the next value to be set.

1. Press the [MODE] key

ð The parameter to be setappears 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 minutes in 10 minutestepsPress the [!] keyEnter minutes in 1 minute steps

7. After setting the minutes, pressthe [!] key

ð [IS SET] appears in the dis‐play and the device auto‐matically returns to themeasuring mode.

Operating Menu

16

3.2 Operating instructions

Display Meaning

Hi Measuring range exceeded or turbidity too large.

Lo Measuring range undershot.

Change the batteries immediately, further processing not pos‐sible.

btLo Battery voltage for background lighting too low, measurementnot possible.

RESULT In a method which was calibrated by the user, when the result isoutput in the display an arrow is displayed in the [Cal] position.

3.3 Error messages

Display Meaning

E 27 / E28 / 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 F: Factory calibration not OK / deleted

E 73 F: User calibration not OK / deleted

Operating Menu

17

4 Analysis method4.1 Procedure instructions when

using liquid reagents

When calculating non-directlydeterminable parameters fromindividual measured values errorpropagation based on the pos‐sible tolerances of the individualmethods must be considered.

1. Cleaning the cuvettes Manydomestic cleaning agents con‐tain reducing substances. Useof these substances leads tofalse low readings when meas‐uring chlorine/bromine/chlorinedioxide/ozone. To exclude thismeasurement error, the glass‐ware must not cause anychlorine loss. Therefore the cuv‐ettes must be stored in asodium hypochlorite solution(0.1 g/l) for one hour and thenthoroughly rinsed with deionisedwater.

2. For the relevant specification offree chlorine and total chlorineuse a separate set of cuvettesfor each determination (see ENISO 7393-2, section. 5.3).

Label the cuvettes set onthe top and bottom so thatinadvertent interchanging ofthe cuvettes is not possible.

3. When preparing water samplesyou must avoid the outgassingof chlorine/bromine/chlorinedioxide/ozone, e.g. by pipettingand shaking. This applies partic‐ularly for the dissolved gaseschlorine dioxide and ozone,especially at temperatures > 30°C. You must carry out the anal‐ysis immediately after taking thewater sample.

4. The DPD colour developmenttakes place at a pH-value of 6.2to 6.5. Therefore the reagentscontain a buffer for pH valueadjustment. You must ensurestrongly alkaline or acidic watersamples come within a pHrange between 6 and 7 (using0.5 mol/l sulphuric acid solutionor 1 mol/l sodium hydroxide sol‐ution).

5. Concentrations aboven 4 mg/l chlorine when using

liquid reagentsn 7.6 mg/l chlorine dioxide

when using liquid reagents

Analysis method

18

ð may lead to results withinthe measuring range downto 0 mg/l. In this case, youmust dilute the watersample with water free fromoxidizing agent and repeatthe measurement (plausi‐bility test).

6. Any turbidity that occurs duringthe colour reaction leads toexaggerated results. You canprevent this error by pre-dilutingthe sample with oxidizing agent-free water.

7. After use immediately close thedropping bottles containing theliquid reagents using therespective screw caps of thematching colour. Store thereagent set at + 6 °C to + 10 °C.

8. The DPD method usedresponds to many oxidisingmedia, hence you must ensurethat the selected oxidising agentis present on its own. Mixtures,e.g. of chlorine and chlorinedioxide only yield total values.These total values must then bedifferentiated using additionalsteps. To differentiate betweenchlorine and chlorine dioxide,see[Chlorine with liquid reagentmethod, section d.]. To differen‐tiate between chlorine andozone, see[Chlorine with liquid reagentmethod, section e.].

9. In water containing bromide andiodide (primarily seawater), thefree and, as the case may be,bound halogens formed bychlorination are stated aschlorine.A steady increase in the meas‐ured value of a water sampletherefore indicates that along‐side the selected oxidisingagent (e.g. chlorine) a furtheroxidising agent (e.g. bromide oriodide) is present. This addi‐tional oxidising agent (e.g. bro‐mide or iodide) may due to cer‐tain circumstances (many timeshigher concentration, equilibria,higher temperature) bleedthrough into the measurement.By working quickly and readingoff the measurement immedi‐ately, the resulting error can beminimised.

ð These interference effectsare also known to occur withthese systems {combinedchlorine ⇛ free chlorine} and{chloride ⇛ chlorine dioxide}.

Analysis method

19

4.2 Quantitative determinationusing liquid reagents

Chlorine with liquid reagents 0.01 ...4.0 mg/lUse the [MODE] key to select [Cl].a) Free chlorine1. Take your cuvette set 12. In a 24 mm cuvette add a 10 ml

water sample and carry out azero correction, seeÄ ‘Switching on and zero cor‐rection’ on page 12

3. Remove the cuvette from thesample chamber and empty thecuvette completely

4. Hold the dropping bottle uprightand by slow pressing, add equalsized drops into the cuvette:n 6 drops ➨ DPD 1 buffer sol‐

utionn 2 drops ➨ DPD 1 reagent

solutionFill the cuvette up to the 10 mlmarking with the water sample


6. Mix the contents of the cuvetteby tipping it back and forth



8. Press the key [ZERO/TEST]

ð [METHOD] flashes forapproximately 3 seconds.The result in mg/l of freechlorine appears in the dis‐play.

b) Total chlorine1. Take your cuvette set 22. In a 24 mm cuvette add a 10 ml





solutionn 3 drops ➨ DPD 3 solutionFill the cuvette up to the 10 mlmarking with the water sample

5. Close the cuvette with the cuv‐ette lid and mix the contents bytipping back and forth

6. Place the cuvette in the samplechamber


Analysis method

20

7. Switch the countdown on, seeÄ ‘ Switching the countdownfunction on’ on page 13. To dothis, press the [!] and[ZERO/TEST] key

ð Wait for the 2 minutes reac‐tion time to elapse

8. The METHOD symbol flashesfor approximately 3 seconds

ð The result in mg/l of totalchlorine appears in the dis‐play.

c) combined chlorine

Combined chlorine = total chlorineminus free chlorine

Calculate the combined chlorine

d) Chlorine together with chlorinedioxide1. Fill a cuvette with a 10 ml water

sample2. Insert a [GLYCINE] tablet

directly from the foil into thewater sample and crush the[GLYCINE] tablet with a stirringrod

3. Close the cuvette with the cuv‐ette lid and mix the contents bytipping back and forth until thetablet has dissolved

4. In a second 24 mm cuvette adda 10 ml water sample and carryout a zero correction, seeÄ ‘Switching on and zero cor‐rection’ on page 12

5. Remove the cuvette from thesample chamber for the zerocorrection and empty the cuv‐ette out



solution7. Pour the contents of the first

cuvette ([GLYCINE] solution)into the prepared cuvette

8. Close the cuvette with the cuv‐ette lid and mix the contents bytipping back and forth



10. Press the key [ZERO/TEST]ð [METHOD] flashes for

approximately 3 seconds.The display value [G] =chlorine dioxide reappearsin the display.


12. Thoroughly clean the cuvetteand the cuvette lid

Analysis method

21







ð Observe the correct posi‐tioning of the cuvette


approximately 3 seconds.The display value [A] = sumof free chlorine plus chlorinedioxide appears in the dis‐play.


19. Hold the dropping bottle uprightand by slow pressing, add equalsized drops into the cuvette:n 3 drops ➨ DPD 3 solution







24. [METHOD] flashes for approxi‐mately 3 seconds.

ð The display value [C] = sumof free chlorine plus com‐bined chlorine plus chlorinedioxide appears in the dis‐play.

25. Calculation:n Chlorine dioxide (mg/l) =

display value [G] x 1.9n Free chlorine (mg/l) = dis‐

play value [A] minus displayvalue [G]

n Combined chlorine (mg/l) =display value [C] minus dis‐play value [A]

Analysis method

22

Chlorine dioxide with liquid reagents0.02 ... 7.6 mg/lUse the [MODE] key to select [CdO].1. In a 24 mm cuvette add a 10 ml











approximately 3 seconds.The result in mg/l of chlorinedioxide appears in the dis‐play.

8.

Measuring tolerances whendetermining the chlorinedioxide content:– 0 ... 1.9 mg/l: ± 0.1 mg/l– > 1.9 ... 3.8 mg/l: ± 0.2

mg/l– > 3.8 ... 5.7 mg/l: ± 0.4

mg/l– > 5.7 ... 7.6 mg/l: ± 0.6

mg/l

Analysis method

23

Fluoride with liquid reagents 0.05 ...2.0 mg/l F-

1. In a 24 mm cuvette add a 10 mlwater sample and carry out azero correction, seeÄ ‘Switching on and zero cor‐rection’ on page 12

2. Pour precisely 2 ml of[SPADNS] reagent solution intothe cuvette with the 10 ml watersample

ð The cuvette is then full tothe brim.






approximately 3 secondsThe result in mg/l of fluorideappears in the display.Measured tolerances: ± 5 %(of the upper range value).

RemarksRemarks:– [SPADNS] reagent solution

from the same batch numbermust be used for calibrationand sample measurement.You must carry out calibrationof the device for each new[SPADNS] reagent solutionbatch number (see StandardMethods 20th, 1998, APHA,AWWA, WEF 4500 F D., S.4-82).

– During calibration and meas‐urement you must carry outthe zero correction and testwith the same cuvette, as thecuvettes have slightly varyingtolerances.

– The calibration solution andthe water samples to bemeasured must have thesame temperature (± 1 °C).

– The analysis result dependson use of the exact sampleand reagent volumes. Youmust only meter the sampleand reagent volumes using a10 ml or 2 ml bulb pipette(class A).

– Above 1.4 mg/l fluoride, theaccuracy reduces. Althoughthe results for most applica‐tions are sufficiently accurate,improved accuracy can beachieved if you dilute thesample prior to use in a 1:1ratio and multiply the result by2.

Analysis method

24

– [SPADNS] reagent solutioncontains arsenite. Chlorineconcentrations up to 5 mg/lare not harmful.

– You must distil seawater andwaste water samples.

4.3 Procedure instructions whenusing tablets

When calculating non-directlydeterminable parameters fromindividual measured values errorpropagation based on the pos‐sible tolerances of the individualmethods must be considered.

1. Cleaning the cuvettes Manydomestic cleaning agents con‐tain reducing substances. Useof these substances leads tofalse low readings when meas‐uring chlorine/bromine/chlorinedioxide/ozone. To exclude thismeasurement error, the glass‐ware must not cause anychlorine loss. Therefore the cuv‐ettes must be stored in asodium hypochlorite solution(0.1 g/l) for one hour and thenthoroughly rinsed with deionisedwater.Volle.

2. For the relevant specification offree chlorine and total chlorineuse a separate set of cuvettesfor each determination (see ENISO 7393-2, section. 5.3).

3. When preparing water samplesyou must avoid the outgassingof chlorine/chlorine dioxide, e.g.by pipetting and shaking. Thisapplies particularly for the dis‐

Analysis method

25

solved gases chlorine dioxideand ozone, especially at tem‐peratures > 30 °C. You mustcarry out the analysis immedi‐ately after taking the sample.

4. The DPD colour developmenttakes place at a pH-value of 6.2to 6.5. Therefore the reagentscontain a buffer for pH valueadjustment. You must ensurestrongly alkaline or acidic watersamples come within a pHrange between 6 and 7 (using0.5 mol/l sulphuric acid solutionor 1 mol/l sodium hydroxide sol‐ution).

5. Concentrations aboven 10 mg/l chlorine when using

tabletsn 19 mg/l chlorine dioxide

when using tablets

ð may lead to results withinthe measuring range downto 0 mg/l. In this case, youmust dilute the watersample with water free fromoxidizing agent and repeatthe measurement (plausi‐bility test).

6. Turbidity (causes incorrectmeasurements): For water sam‐ples with High Calcium content*and/or high conductivity* whenusing the [DPD no. 1 tablet] theresult can be the renderingturbid of the water sample andconsequently incorrect meas‐urements. In this case, youmust use the alternative reagenttablet

[DPD no. 1 High Calcium]. If theturbidity only appears after theaddition of the [DPD No. 3]tablet, you can prevent this byuse of the[DPD no. 1 High Calcium] andthe [DPD no. 3 High Calcium]tablet. The[DPD No. 1 High Calcium] tabletshould only be used in conjunc‐tion with the[DPD No. 3 High Calcium].ð * exact values cannot be

specified, as the formationof turbidity depends on thetype and composition of thewater sample.

7. The DPD method usedresponds to many oxidisingmedia, hence you must ensurethat the selected oxidising agentis present on its own. Mixtures,e.g. of chlorine and chlorinedioxide only yield total values.These total values must then bedifferentiated using additionalsteps. To differentiate betweenchlorine and chlorine dioxide,see[Chlorine with tablet method,section D "Chlorine togetherwith chlorine dioxide"] To differ‐entiate between chlorine andozone, see[Chlorine with tablet method]

8. In water containing bromide andiodide, the free and, as the casemay be, bound halogens formedby chlorination are stated aschlorine. A steady increase inthe measured value of a water

Analysis method

26

sample therefore indicates thatalongside the selected oxidisingagent a further oxidising agentis present. This oxidising agentmay due to certain circum‐stances (many times higherconcentration, equilibria, highertemperature) bleed through intothe measurement. By workingquickly and reading off themeasurement immediately, theresulting error can be mini‐mised.

ð These interference effectsare also known to occur withthese systems {combinedchlorine ⇛ free chlorine} and{chloride ⇛ chlorine dioxide}.

4.4 Quantitative determinationusing tablets

Chlorine with tablets 0.01 ... 6.0 mg/lUse the [MODE] key to select [Cl].a) Free chlorine1. Take your cuvette set 12. In a 24 mm cuvette add a 10 ml


3. Remove the cuvette from thesample chamber and empty thecuvette down to the last fewdrops

4. Insert a [DPD No. 1] tabletdirectly from the foil into thewater sample and crush the[DPD No. 1] tablet with a stirringrod

5. Fill the cuvette up to the 10 mlmarking with the water sample





approximately 3 seconds.

Analysis method

27

The result in mg/l of freechlorine appears in the dis‐play.

b) Total chlorine1. Take your cuvette set 22. In a 24 mm cuvette add a 10 ml


3. Remove the cuvette from thesample chamber and empty thecuvette down to the last fewdrops




7. Close the cuvette with the cuv‐ette lid and mix the contents bytipping back and forth until thetablets have dissolved






ð The result in mg/l of totalchlorine appears in the dis‐play.

c) combined chlorine

Combined chlorine = total chlorineminus free chlorine

Calculate the combined chlorine

d) Chlorine together with chlorinedioxide1. Fill a cuvette with a 10 ml water

sample2. Insert a [GLYCINE] tablet

directly from the foil into thewater sample and crush the[GLYCINE] tablet with a stirringrod


Analysis method

28

4. In a second 24 mm cuvette adda 10 ml water sample and carryout a zero correction, seeÄ ‘Switching on and zero cor‐rection’ on page 12

5. Remove the cuvette from thesample chamber for the zerocorrection and empty the cuv‐ette out


7. Pour the contents of the firstcuvette ([GLYCINE] solution)into the prepared cuvette





approximately 3 seconds.The display value [G](chlorine dioxide) reappearsin the display.



13. Fill a cuvette with a few drops ofa water sample




17. Mix the contents of the cuvetteby tipping it back and forth, untilthe tablet has dissolved




approximately 3 seconds.The display value [A] (sumof free chlorine plus chlorinedioxide) appears in the dis‐play.


21. Insert a [DPD No. 3] tabletdirectly from the foil into thesame water sample and crushthe [DPD No. 3] tablet with astirring rod


Analysis method

29







ð The display value [C] (sumof free chlorine plus com‐bined chlorine plus chlorinedioxide) appears in the dis‐play.

27. Calculation:n Chlorine dioxide (mg/l) =

display value [G] x 1.9n Free chlorine (mg/l) = dis‐

play value [A] minus displayvalue [G]

n Combined chlorine (mg/l) =display value [C] minus dis‐play value [A]

Chlorine dioxide with tablet 0.02 ... 11mg/lUse the [MODE] key to select [CdO].1. In a 24 mm cuvette add a 10 ml


2. Remove the cuvette from thesample chamber and empty thecuvette down to the last fewdrops of the water sample

3. Insert a [DPD No. 1] tabletdirectly from the foil into thewater sample and crush thetablet with a stirring rod







approximately 3 seconds.The result in mg/l of chlorinedioxide appears in the dis‐play.

Analysis method

30

9.

Measuring tolerances whendetermining the chlorinedioxide content:– 0 ... 1.9 mg/l: ± 0.1 mg/l– > 1.9 ... 3.8 mg/l: ± 0.2

mg/l– > 3.8 ... 5.7 mg/l: ± 0.4

mg/l– > 5.7 ... 7.6 mg/l: ± 0.6

mg/l– > 7.6 ... 11 mg/l: ± 0.8

mg/l

Analysis method

31

5 CalibrationChlorine range (CI) calibrationUser calibration

NOTICE!A separate calibration of themeasuring ranges bromine,chlorine dioxide or ozone is notpossible. The chlorine measuringrange calibration (Cl) is relied on.

User calibration (display in calibrationmode ) = [cCAL]Factory calibration (display in calibra‐tion mode ) = [cCAL]1. Confirm the selection by

pressing the [MODE] key

ð The display toggles between[CAL / METHOD]

2. Select the method to be cali‐brated using the [MODE] key

3. Fill the cuvette up to the 10-mlmarking with standard solution,without adding reagents





approximately 8 seconds.

The confirmation of the zerocorrection [0.0.0] alternateswith [CAL].



9. Fill the cuvette up to the 10-mlmarking with a standard solutionof known concentration andintroduce the reagents asdescribed under Ä ‘Chlorinewith liquid reagents 0.01 ... 4.0mg/l’ on page 20 or Ä ‘a) Freechlorine’ on page 27





approximately 3 seconds.The confirmation of theresult alternates with [CAL].

Calibration

32

13. If the result matches the valueof the standard used, (within thetolerance under consideration)you can quit calibration mode bypressing the [ON/OFF] key

Changing the displayed value:

Pressing the [MODE] key 1 xincreases the displayed result by1 digit.Pressing the [ZERO/TEST] key 1x reduces the displayed result by1 digit.

1. Repeatedly press the keys untilthe displayed result matches thevalue of the standard used

2. Press the key [ON/OFF]ð The new correction factor is

calculated and saved in theuser calibration level.The confirmation of the cali‐bration appears in the dis‐play for 3 seconds.

Fluoride range calibrationUser calibration

Calibration takes place with: 0 mg/l and 1 mg/l F- standard and aclean cuvette.

1. Confirm the selection bypressing the [MODE] key

ð The display toggles between[CAL / F].

2. Fill the cuvette up to the 10 mlmarking with demineralisedwater





approximately 8 seconds.The confirmation of the zerocorrection [0.0.0] alternateswith [CAL].

6. Add precisely 2 ml of [SPADNS]reagent solution to the cuvettein addition to the 10 ml of dem‐ineralised water


Calibration

33





approximately 3 seconds.[F0] appears in the display.

11. Remove the cuvette from thesample chamber and thoroughlyclean the cuvette and cuvette lid

12. Fill the cuvette with 10 ml ofstandard fluoride (concentration1 mg/l F)






approximately 3 seconds.[F1] appears in the display.

17. By pressing the key [ON/OFF]you can save the new calibra‐tion

ð The confirmation of the cali‐bration appears in the dis‐play for 3 seconds.

Return to the factory calibration

A return from the user calibrationto the factory calibration is onlypossible for all methods simulta‐neously.In a method which was calibratedby the user, when the result isoutput in the display an arrow isdisplayed in the [Cal] position.

To return the device tot he factory cal‐ibration, proceed as follows:1. The device is switched off.

Simultaneously press the[MODE] and [ZERO/TEST] keys


ð After approximately 1second release the [MODE]and [ZERO/TEST] keys.

3. The display toggles between:[SEL] and [CAL]ð The device is in the as-sup‐

plied (factory) condition([SEL] stands for select).

4. or5. The display toggles between:

[SEL] and [CAL]

Calibration

34

ð The device operates with acalibration carried out by theuser. If the user calibrationis to be retained, switch thedevice off using the[ON/OFF] key.

6. By pressing the [MODE] keyyou can simultaneously activatethe factory calibration for allmethods.

7. The display toggles between[SEL] and [CAL]

8. Switch the device off using the[ON/OFF] key

Calibration

35

6 Technical data

Device Two wavelengths, automatic wavelength selection,colorimeter with direct measured value display

Optics LEDs, interference filter (IF) and photo sensor at thetransparent sample chamberWavelength specifications of the interference filter:n 530 nm Δλ = 5 nmn 560 nm Δλ = 5 nm

Wavelength trueness ± 1 nm

Photometric accuracy* 3 % FS (Full Scale) (T = 20 °C ... 25 °C)

Photometric resolution 0.01 A (Absorption units)

Power supply 4 batteries (AA/LR 6)

Operating time Approx. 53 h operating time or 15,000 measure‐ments in continuous operation with backgroundlighting switched off

Auto-OFF Automatic device switch-off 10 minutes after the lastkey was pressed

Display Backlit LCD (upon pressing of a key)

Memory Internal ring buffer for 16 data records

Time Real time clock and date

Calibration Fabrication and user calibration.Return to the factory calibration is possible.

Dimensions 190 x 110 x 55 mm (L x W x H)

Weight Basic device approx. 455 g (with batteries)

*measured with standard solutions

Technical data

36

Ambient conditions Temperature: 5 ... 40 °CRelative humidity: 30 ... 90 % (non-condensing)

Water-tight analogous to IP 68 (1 hour at 0.1m); buoyant device

*measured with standard solutions

The specified device accuracy is only obtained when using the originalreagent system.

Technical data

37

7 Consumables and spare partsConsumables

Material Part number

DPD-1 buffer, 15 ml 1002857

DPD-1 reagent, 15 ml 1002858

DPD-3 solution, 15 ml 1002859

[SPADNS] reagent, 250 ml to determine the fluoridelevel

1010381

DPD reagents set, content 15 ml each:n 3 x DPD-1 buffern 1 x DPD-1 reagentn 2 x DPD-3 solution

1007567

Calibration standard fluoride 1 mg/l, for calibration of thephotometer

1010382

Spare parts

Material Part number

3 pieces round cuvettes with lid (replacement cuvettes)for:n DPD determination

1007566

3 pieces replacement cuvettes for fluoride determination 1010396

Consumables and spare parts

38

8 Standards complied with and conformity declarationDeclaration of ConformityYou can find the EC Declaration ofConformity as a download underhttp://www.prominent.de/Service/Download-Service.aspx

Standards complied withEC EMC Directive (2004/108/EC)EN 61326 - 1

Standards complied with and conformity declaration

39

9 IndexBBattery compartment cover........... 11Battery replacement...................... 11CChlorine dioxide with liquidreagents 0.02 ... 7.6 mg/l............... 23Chlorine dioxide with tablet0.02 ... 11 mg/l............................... 30Chlorine together with chlorinedioxide (liquid reagents)................ 21Chlorine together with chlorinedioxide (tablet)............................... 28Combine chlorine (tablet).............. 28Combined chlorine (liquidreagents)....................................... 21Consumables................................ 38Countdown.................................... 13DDanger from hazardous sub‐stances!........................................... 5Date and time (24 h format).......... 16Declaration of Conformity.............. 39Degree of protection IP 68............ 36Display background lighting.......... 15Displaying stored data................... 14EEN ISO 7393-2, section 5.3..... 18, 25Error messages............................. 17FFluoride range calibration.............. 33Free chlorine (liquid reagents)....... 20

Free chlorine (tablet)..................... 27GGeneral non-discriminatoryapproach......................................... 3IIP 68.............................................. 36NNon-discriminatory approach.......... 3PPhotometer leak-tightness............. 11QQuestion: For which measuredvariables can I carry out a cali‐bration?......................................... 32Question: How can I readstored data?.................................. 14Question: How can I return tothe factory calibration?.................. 34Question: How do I adjust thedate and time?............................... 16Question: How do I calibratefluoride........................................... 33Question: How do I carry out auser calibration?............................ 32Question: How do I carry out azero correction?............................. 12Question: How do I carry outthe zero correction?......................... 8Question: How do I change thebattery?......................................... 11Question: How do I enter thevalues determined by the cali‐bration in the device?.................... 33

Index

40

Question: How do I switch thebackground lighting of the dis‐play off and on?............................. 15Question: How do I switch thecountdown on?.............................. 13Question: What does thestandard scope of supply include?. . 6Question: What must it cleanand how?......................................... 8Question: What sort of consum‐ables are there?............................ 38Question: What sort of spareparts are there?............................. 38Question: What type of errormessages are there?..................... 17Question: Where do I find theDeclaration of Conformity?............ 39Question: Which standards arecomplied with?............................... 39

RRepeating the analysis.................. 13Return to the factory calibration . . . 34SSafety data sheet............................ 5Safety data sheets........................... 8Spare parts.................................... 38Standards complied with............... 39Standard scope of delivery.............. 6Switching on and zero correction. . 12TTotal chlorine (liquid reagents)...... 20Total chlorine (tablet)..................... 28ZZero correction.......................... 8, 12

Index

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dulcotest dt2c photometerprominent.us/promx/pdf/985619_ba_dt_036_02_12_dulcotest_dt2c_en.pdfto...

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