20
MD100_8e 05/2023
GB
Methods
Measurement
Fix the adapter for 16 mm vials on the sample chamber.
Switch the unit on using the [ON/OFF] key.
The display shows the following:
Select the required test using the [MODE] key.
Scroll Memory (SM)
To avoid unnecessary scrolling for the required test range, the instru-
ment memorizes the last range used before being switched off. When
the instrument is switched on again, the scroll list comes up with the
last used test range first.
The display shows the following:
Place the blank in the adapter (Note 1–4) making sure that the
marks are aligned.
Blanks are specially prepared for each individual test range.
Press the [ZERO/TEST] key.
The "Range" symbol flashes for approx. 8 seconds.
RANGERANGE
RANGERANGE
On
Off
Zero
Test
Mode
COD vario
Select the appropriate vial for the desired range:
Reagent Form of reagent/Quantity Order-No.
CSB VARIO LR 0 - 150 mg/l
CSB VARIO MR 0 - 1500 mg/l
CSB VARIO HR 0 - 15000 mg/l
1 Set (25 tests)
1 Set (25 tests)
1 Set (25 tests)
2420720
2420721
2420722
Preparing the Sample
Open a reaction vial with a white cap and add the specified volume.
(Ensure that appropriate personnel safety equipment is used.)
LR-/MR: 2 ml water sample
HR: 0.2 ml water sample
Prepare a blank (Note 1) by using deionised water (TOC-free) instead of the sample
(LR/MR: 2 ml, HR: 0.2 ml).
Replace the cap tightly. Invert the vial gently several times to mix the contents (The vial
will become hot during mixing!) and digest the vials for 120 minutes in the reactor at
a temperature of 150°C. Remove the vials from the reactor and allow them to cool down
to 60°C or less. Mix the contents by inverting each vial several times while still warm. Then
allow the vials to cool to ambient temperature before measuring.
RANGERANGE
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