Hach-Lange PCII-COD LCK 014_114_314_614 - Manual (Page 31)

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Section 4 Operation
4.1 Analyse COD with LANGE Cuvette Tests
DANGER
Handling chemical samples, standards and reagents can be dangerous. Users
of this product are advised to familiarize themselves with safety procedures
and the correct use of chemicals, and to carefully read all relevant material
safety data sheets.
To analyse COD follow the working procedure enclosed in the according Cuvette Test
LCK 014/114/314/614.
4.2 Quality assurance
The measurement results must be subjected to plausibility checks (dilute and/or
spike the sample).
Regular checks with corresponding standard solutions (see Section 5 Replacement
Parts and Accessories on page 31 ) ensure that your measurement system is
functioning properly and is being correctly operated.
4.3 Evaluate LANGE COD Cuvette Tests
Note: Make sure that the instrument is programmed with the corresponding calibration data,
see
3.4 Check entered data on page 28 .
1. Preparation of a reagent blank: Fill a cuvette with the appropriate volume of DI
water instead of sample. Like for the sample cuvette accomplish exactly all
further working steps accordingly to the LCK working procedure.
Note: Only one reagent blank per each test charge is necessary. Store it darkly.
2. Press POWER to switch on the instrument. COD LCK 014/114 with POCKET
COLORIMETER II 600 nm, COD LCK 314/614 with POCKET COLORIMETER
II 450 nm.
3. Make sure that the correct measuring range is selected!
Otherwise press MENU. "SEL" is displayed. A flashing arrow indicates the
current measuring range (1 or 2). Press GREEN key to select measuring range.
Press MENU to get back to the measuring mode.
4. Insert the reagent blank into the cell holder equipped with the cuvette adapter
1 cm.
Note: Make sure that the cuvette adapter is positioned correctly.
5. Place the instrument cap with the HACH LANGE label over the cell holder to
cover the cuvette.
6. Press BLUE key. "0" (LCK 014/114) or "0.0" (LCK 314/614) is displayed.
7. Remove the instrument cap and insert the sample cuvette.
8. Place the instrument cap over the cell holder to cover the cuvette.
9. Press GREEN key.