Environmental Express CL 200 User manual

CL 200 - Portable Chlorine Colorimeter
Instruction Manual
99561-78
Environmental Express
www.environmentalexpress.com

CL 200 Instruction Manual2
Important Information
Important Information for consumers in the EU:
Disposal instructions for batteries and accumulator:
EC Guideline 2006/66/EC requires users to return all used
and worn-out batteries and accumulators. They must not be
disposed of in normal domestic waste. Because our products
include batteries and accumulators in the delivery package our
advice is as follows : Used batteries and accumulators are not
items of domestic waste. They must be disposed of in a proper
manner. Your local authority may have a disposal facility;
alternatively you can hand them in at any shop selling batteries
and accumulators. You can also return them to the company
which supplied them to you; the company is obliged to accept
them.
Disposal instructions for electrical equipment
Because of the European Directive 2012/19/EU your electrical
instrument must not be disposed of with normal household
waste! We will dispose of your electrical instrument in a profes-
sional and environmentally responsible manner. This service,
excluding the cost of transportation is free of charge. This
service only applies to electrical instruments purchased after
13th August 2005. Send your electrical Environmental Express
instrument for disposal freight prepaid to your supplier.
Safety - General Instructions
The manufacturer’s liability and warranty for damage and consequential damates lapses
with improper use, failure to follow this operating manual, use of insu󰀩ciently qualied
specialized personnel or unauthorized changes to the instrument. The manufacturer is not
liable for costs or damages that arise for the user or third parties due to the use of this
instrument, especially in case of improper use of the instrument or misuse or faults in the
connection or of the instrument. The manufacturer assumes no liability for print errors.
Safety information in the operating manual
This operating manual provides important information on the safe operation of the product.
Read this operating manual thoroughly and make yourself familiar with the product
before putting it into operation or working with it. The operating manual must be kept in
the vicinity of the product so you can always nd the information you need.

V1_04.2022 3
Guidelines for colorimetric measurements
1. Vials, caps and stirring rods should be cleaned thoroughly after each analysis to pre-
vent interference. Even minor reagent residues can cause errors in the test result.
2. The outside of the vial must be clean and dry before starting the analysis. Clean the
outside of the vials with a towel to remove ngerprints or other marks.
3. Zero calibration and test must be carried out with the same vial as there may be slight
di󰀨erences in optical performance between vials.
4. The vials must be positioned in the sample chamber for zeroing and test with the mark
on the vial aligned with the mark on the instrument.
5. Always perform zeroing and test with the vial cap tightly closed. Only use the cap with
a sealing ring.
6. Bubbles on the inside wall of the vial lead to incorrect measurements. To prevent this,
remove the bubbles by swirling the vial before performing the test.
7. Avoid spillage of water into the sample chamber because this can lead to incorrect
test results.
8. Contamination of the transparent cell chamber can result in wrong readings. Check
at regular intervals and – if necessary – clean the transparent cell chamber using lint-
free, moist cloths (oil-free) or cotton buds.
9. Large temperature di󰀨erences between the instrument and the environment can led to
errors – e.g. due to the formation of condensation in the cell chamber or on the vial.
10. To avoid errors caused by stray light do not use the instrument in bright sunlight.
11. Always add the reagent tablets to the water sample straight from the foil without
touching them with the ngers.
12. The reagents must be added in the correct sequence.
Method Notes
1. Prior to measurement ensure that the sample is suitable for analysis (no major inter-
ferences and does not require any preparation i.e. pH adjustment, ltration etc
2. Di󰀨erent Rell Packs available on request.
3. Reagents are designed for use in chemical analysis only and should be kept well out
of the reach of children.
4. Ensure proper disposal of reagent solutions.
5. Material Safety Data Sheets are available on request or for immediate download on
the web: www.environmentalexpress.com

CL 200 Instruction Manual4
Instrument automatic wavelength selection,
direct reading colorimeter
Light source LEDs, interference lters (IF) and photo-
sensor in transparent
cell chamber
Photometric Range -2600 - 2600 mAbs
Operating Wavelenght 530 nm Δλ = 5 nm
Wavelength accuracy ± 1 nm
Photometric accuracy* 3 % FS (T = 20 °C – 25 °C)
Photometric resolution 0.01 A
Auto-OFF automatic switch o󰀨 25 minutes after last
keypress (di󰀨erent reaction times depend-
ing on available method)
Display backlit LCD (on keypress)
Time real time clock and date
Calibration user and factory calibration
resetting to factory calibration possible
Ambient conditions temperature: 5– 40 °C
rel. humidity: 30–90 % (non-condensing)
Waterproof oating; as dened in IP 68 (1 hour at 0.1
meter)
CE Certicate for Declaration of CE-Conformity
available for download at:
*measured with standard solutions
Technical Specications

V1_04.2022 5
Guidelines for colorimetric measurements

CL 200 Instruction Manual6
CAUTION:
To ensure that the instrument is waterproof:
• seal ring (E) must be in position
• battery compartment cover (B) must be xed with the four screws
If the batteries are removed for more than one minute the date and time menu starts auto-
matically when the colorimeter is switched on the next time.

V1_04.2022 7
Function Descriptions
OTZ (One Time Zero)
The One Time Zero is available for all photometer variants whereby the zero adjustment
is carried out in a 24-mm round vial with sample water. It can be used if di󰀨erent tests are
carried out with identical test conditions and the same water sample. The zero adjustment
is saved until the device is switched o󰀨.
The zero setting can be repeated each time if necessary

CL 200 Instruction Manual8

V1_04.2022 9
Chlorine PP
0.02 - 2 mg/l Cl2 CL2
DPD
Method information
Instrument Name Cuvette Wavelength Measuring Range
CL 200 Colorimeter ø 24 mm 530 nm 0.02 - 2 mg/l Cl2
Description Part Number
CL 200 Chlorine Colorimeter 99561-78
Sample Cells, ø 24 mm, Glass 12 Pack with lids & light
shielding rings
99561-99
Required Materials
Description Part Number
Chlorine Reference Standard Kit 0 / 0.02 / 1.0 mg/l Verication
Standards
99561-98
Primary Chlorine Standard Kit EA; makes 100 ml of 1.5 ppm
standard
99561-97
Light Shielding Rings 12 Pack 99562-03
Optional Accessories:
Description Part Number
DPD Free, F10 100 Pack 99561-93
DPD Total, F10 100 Pack 99561-95
Required Reagents:

CL 200 Instruction Manual10
Sampling
1. When preparing the sample, Chlorine outgassing, e.g. through the pipette or shaking,
must be avoided.
2. The analysis must take place immediately after taking the sample.
Preparation
1. Cleaning of vials:
As many household cleaners (e.g. dishwasher detergent) contain reducing substanc-
es, this can lead to lower results with the determination of Chlorine. To avoid measure-
ment errors, the glassware used should be free of chlorine consumption. To achieve
this, all glassware should be placed in a sodium hypochlorite solution (0.1 g/L)for one
hour and then rinsed thoroughly with deionized water.
2. For individual testing of free and total Chlorine, the use of di󰀨erent sets of glassware is
recommended (EN ISO 7393-2, 5.3)
3. The DPD color development is carried out at a pH value of 6.2 to 6.5. The reagents
therefore contain a bu󰀨er for the pH adjustment. Strong alkaline or acidic water sam-
ples must therefore be adjusted between pH 6 and pH 7 before the analysis (use 0.5
mol/l Sulfuric acid or 1 mol/l Sodium hydroxide).
Chlorine PP / 0.02 - 2 mg/l / CL2

V1_04.2022 11
Measuring Free Chlorine with Powder Packs
1. Select the method on the device: CL2
Fill 24 mm vial with 10 ml
sample.
Close vial Place sample vial in the
sample chamber. Pay
attention to the positioning.
Press the ZERO button Remove the vial from the
sample chamber.
Add Chlorine FREE-DPD/
F10 powder pack
Close vial Invert several times to mix
the contents (20 sec.)
Chlorine PP / 0.02 - 2 mg/l / CL2

CL 200 Instruction Manual12
Place sample vial in the
sample chamber. Pay
attention to the positioning.
Press the TEST button
The result in mg/l free chlorine appears on the display
Chlorine PP / 0.02 - 2 mg/l / CL2

V1_04.2022 13
Measuring Total Chlorine with Powder Packs
1. Select the method on the device: CL2
Fill 24 mm vial with 10 ml
sample.
Close vial Place sample vial in the
sample chamber. Pay
attention to the positioning.
Press the ZERO button Remove the vial from the
sample chamber.
Add Chlorine TOTAL-DPD/
F10 powder pack
Close vial Invert several times to mix
the contents (20 sec.)
Chlorine PP / 0.02 - 2 mg/l / CL2

CL 200 Instruction Manual14
Place sample vial in the
sample chamber. Pay
attention to the positioning.
Press the TEST button
Once the reaction period is nished, the measurement takes place automatically.
The result in mg/l total Chlorine appears on the display.
Wait for 3 minute reaction
time
Chlorine PP / 0.02 - 2 mg/l / CL2

V1_04.2022 15
Chemical Method
DPD
Interferences
Persistant Interferences
• All oxidizing agents in the samples react like chlorine, which leads to higher results.
Removeable Interferences
• Interference from Copper and Iron (III) are eliminated by the addition of EDTA.
• Concentrations above 2 mg/L Chlorine, in the event of using Powder Packs, can lead-
to results within the measuring range of up to 0 mg/L. In this case, the sample must be
diluted with chlorine-free water. 10 ml of the diluted sample should be mixed with the
reagent and the measurement taken again (plausibility test).
Interference from / [mg/L]
CrO4
2- 0.01
MnO20.01
Method Validation
Limit of Detection 0.01 mg/L
Limit of Quantication 0.03 mg/L
End of Measuring Range 2 mg/L
Sensitivity 1.68 mg/L / Abs
Condence Intervall 0.033 mg/L
Standard Deviation 0.014 mg/L
Variation Coe󰀩cient 1.34 %
Conformity EN ISO 7393-2
Chlorine PP / 0.02 - 2 mg/l / CL2

CL 200 Instruction Manual16

V1_04.2022 17
Chlorine PP HR
0.1 - 8 mg/l Cl2 CL8
DPD
Method information
Instrument Name Cuvette Wavelength Measuring Range
CL 200 Colorimeter ø 10 mm 530 nm 0.1 - 8 mg/l Cl2
Description Part Number
CL 200 Colorimeter 99561-78
Sample Cells, ø 10 mm, Plastic 12 Pack with lids 99562-01
Required Materials
Description Part Number
Chlorine Reference Standard Kit 0 / 0.02 / 1.0 mg/l Verication
Standards
99561-97
Primary Chlorine Standard Kit EA; makes 100 ml of 1.5 ppm
standard
99561-98
Optional Accessories:
The following equipment and accessories must be on-hand to perform a test:
Description Part Number
DPD Free, F10 100 Pack 99561-93
DPD Total, F10 100 Pack 99561-95
Required Reagents:

CL 200 Instruction Manual18
Sampling
1. When preparing the sample, Chlorine outgassing, e.g. through the pipette or shaking,
must be avoided.
2. The analysis must take place immediately after taking the sample.
Preparation
1. Cleaning of vials:
As many household cleaners (e.g. dishwasher detergent) contain reducing substanc-
es, this can lead to lower results with the determination of Chlorine. To avoid measure-
ment errors, the glassware used should be free of chlorine consumption. To achieve
this, all glassware should be placed in a sodium hypochlorite solution (0.1 g/L)for one
hour and then rinsed thoroughly with deionized water.
2. For individual testing of free and total Chlorine, the use of di󰀨erent sets of glassware is
recommended (EN ISO 7393-2, 5.3)
3. The DPD color development is carried out at a pH value of 6.2 to 6.5. The reagents
therefore contain a bu󰀨er for the pH adjustment. Strong alkaline or acidic water sam-
ples must therefore be adjusted between pH 6 and pH 7 before the analysis (use 0.5
mol/l Sulfuric acid or 1 mol/l Sodium hydroxide).
Chlorine PP HR / 0.1 - 8 mg/l / CL8

V1_04.2022 19
Measuring Free Chlorine with Powder Packs
1. Select the method on the device: CL8
Fill 10 mm vial with 5 ml
sample.
Close vial Place sample vial in the
sample chamber. Pay
attention to the positioning.
Press the ZERO button Remove the vial from the
sample chamber.
Close vial Invert several times to mix
the contents (20 sec.)
Place sample vial in the
sample chamber. Pay
attention to the positioning.
Add two Chlorine FREE-
DPD / F10 powder packs .
Chlorine PP HR / 0.1 - 8 mg/l / CL8

CL 200 Instruction Manual20
Press the TEST button
The result in mg/l free chlorine appears on the display
Chlorine PP HR / 0.1 - 8 mg/l / CL8