Hach-Lange POCKET Colorimeter II Application Instruction - Manual (Page 25)

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Section 4 Operation
4.1 Analyse Formaldehyde with LANGE Cuvette Test
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 formaldehyde follow the working procedure enclosed in the according
Cuvette Test LCK 325.
4.2 Quality assurance
The measurement results must be subjected to plausibility checks (dilute and/or
spike the sample).
4.3 Evaluate LANGE Formaldehyde Cuvette Test
Note: Make sure that the instrument is programmed with the corresponding calibration data,
see
3.4 Check entered data on page 23 .
1. Press POWER to switch on the instrument.
2. Make sure that channel 1 is selected!
Otherwise press
MENU. "SEL" is displayed. A flashing arrow indicates the
current channel (1 or 2). Press
GREEN key to select channel 1. Press MENU to
get back to the measuring mode.
3. Insert the zero-solution into the cell holder equipped with the cuvette adapter
1 cm.
Note: Make sure that the cuvette adapter is positioned correctly.
4. Place the instrument cap with the HACH LANGE label over the cell holder to
cover the cuvette.
5. Press BLUE key. "0.00" is displayed.
6. Remove the instrument cap and insert the sample cuvette.
7. Place the instrument cap over the cell holder to cover the cuvette.
8. Press GREEN key.
9. The result is displayed in mg/l Formaldehyde.
Note: In case the formaldehyde concentration is out of the selected measuring range the
value for the lowest or highest concentration is displayed and flashes. Repeat the test
diluting your sample.
Note: A new zero measurement should be performed prior to each individual test series.