Hach NV3300, User Manual

Page: 15 / 130

Option Description
Colorize above upper limits Select to enable the upper warning threshold.
Upper limit 1 (yellow) Sets the first upper limit for the warning threshold.
Upper limit 2 (red) Sets the second upper limit for the warning threshold.
Colorize above lower limits Select to enable the lower warning threshold.
Lower limit 1 (yellow) Sets the first lower limit for the warning threshold.
Lower limit 2 (red) Sets the second lower limit for the warning threshold.
Maintenance
W A R N I N G
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
N O T I C E
Do not disassemble the instrument for maintenance. If the internal components must be cleaned or repaired,
contact the manufacturer.
Clean the instrument
Clean the exterior of the instrument with a moist cloth and a mild soap solution and then wipe the
instrument dry as necessary.
To remove hard dirt, soak the sensor for some hours in a rinsing solution. Use a sponge if necessary.
Make sure that the sensor connector is always dry and clean.
Brownish dirt or points are unwanted material of iron or manganese oxides. Use a 5% oxalic acid or
10% ascorbic acid solution to clean the sensor. Make sure that the sensor touches the acid only a
short time and is then rinsed fully with plenty of water.
Note: Do not use alcohol, benzene, dilutor or other flammable material to clean the instrument.
Note: Do not scratch the glass of the windows.
1. From the Main menu, select Options .
2. Select Service mode to set the relay for the compressed air cleaning to HOLD.
Note: Service mode also disables measurements.
3. Remove the sensor from the basin or flow cell.
4. Clean the instrument.
5. Select Cleaning and push EXECUTE to clean the measuring window. Refer to Clean the
measuring window on page 15.
6. When the cleaning is complete, push Service mode to remove the HOLD condition.
Clean the measuring window
C A U T I O N
Chemical exposure hazard. Obey laboratory safety procedures and wear all of the personal protective
equipment appropriate to the chemicals that are handled. Refer to the current safety data sheets
(MSDS/SDS) for safety protocols.
The measuring window is made of quartz glass. Rinse the measuring window with tap water to
remove particles. Then, clean the measuring window with a few drops of acetone and a lint-free
cloth.
English 15