Version 1 02/2017
AQ3140 COD Colorimeter PROFORMA User Guide
6
7
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: Lr (low range), Mr (medium range) or Hr (high range)
Select the required test using the [MODE] key .
Scroll Memory (SM)
To avoid unnecessary scrolling for the required test range, the instrument 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: Lr, Mr or Hr
On
Off
Zero
Test
Mode
COD
Select the appropriate vial for the desired range:
Reagent
Quantity
Cat. No.
COD LR 0 - 150 mg/l
COD MR 0 - 1500 mg/l
COD HR 0 - 15000 mg/l
25 CT
150 CT
25 CT
150 CT
25 CT
150 CT
CODL00
CODL150
CODH00
CODM150
CODHP0
CODH150
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 (
Caution:
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 .
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 "Lr, Mr or Hr" symbol flashes for approx. 8 seconds.
The display shows the following: 0 .0 .0
After zeroing remove the vial from the adapter .
Place the sample in the adapter (Note 2–4) making sure that the marks are aligned .
Press the [ZERO/TEST] key .
The "Lr, Mr or Hr" symbol flashes for approx. 3 seconds.
The result appears in the display .
LR-/MR-range: in mg/l
HR-range:
in g/l
The result is saved automatically .
Tolerance: ± 3 .5 % (full scale)
Repeating the test:
Press the [ZERO/TEST] key again .
New zero calibration:
Press the [ZERO/TEST] key for 2 seconds .
Zero
Test
Zero
Test
Zero
Test
Methods
Methods
