Environmental Express COD 200 Manual de usuario

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 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

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 (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

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 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

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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