Environmental Express COD 200 Manuel utilisateur
COD 200
Portable Chemical Oxygen Demand Colorimeter
Instruction Manual
99561-84
Environmental Express
www.environmentalexpress.com
COD 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 insuciently qualied
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
dierences 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 dierences 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. Dierent Rell 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
COD 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 430 nm Δλ = 5 nm
610 nm Δλ = 6 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 (dierent 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 dened in IP 68 (1 hour at 0.1
meter)
CE Certicate for Declaration of CE-Conformity
available for download at:
*measured with standard solutions
Technical Specications
V1_04.2022 5
Guidelines for colorimetric measurements
COD 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 dierent 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
COD 200 Instruction Manual8
Sample Preparation
Removal of high Chloride concentration in COD samples
Chloride content may interfere during COD determination, if the tolerance level of the
used test will be exceeded. To overcome that problem the following sample pretreatment
can be used:
Equipment:
• 2 Erlenmeyer asks 300 ml with NS 29/32 connection
• 2 HCl absorber according to DIN 38409
• 2 glass stoppers NS 29/32
• Pipettes for volumes of 20 and 25ml
• Magnetic stirrer and magnetic stirring rods
• Thermometer to measure 0 - 100 °C
• Ice bath
Reagents:
• 12 to 14 g of sodalime
• 50 ml H2SO4
(95 - 97%, 1.84 g/ml, CSB free)
• Hydrochloric acid 10 % to clean absorber from residual lime
V1_04.2022 9
COD 200 Instruction Manual10
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