Hach US9001 Manuel D'utilisation page 15

Maintenance
Multiple hazards. Only qualified personnel must conduct the tasks described in this section of the
document.
Do not disassemble the instrument for maintenance. If the internal components must be cleaned or repaired,
contact the manufacturer.
Clean the sensor
Do not use steel wool or abrasive pads to clean the sensor or sensor damage will occur.
Examine the sensor periodically for unwanted material and deposits. Clean the sensor when there is
a buildup of deposits or when performance has decreased.
use and not to use.
Use
Dish detergent and water
1. Disconnect the sensor from the flow logger.
2. Soak the sensor in dish detergent and water.
3. Clean the sensor face and reflector.
4. Use a spray bottle or squeeze bottle to remove heavier unwanted material.
Troubleshooting
Problem
Echo loss Foam or condensing moisture (steam
or fog) which absorbs the ultrasonic
signal
High wind such as air currents in a
closed high velocity sewer system or
wind gusts during a storm
The sensor face is not parallel with the
surface of the measurement target.
The surface of the measurement
target is not good (extreme
turbulence).
C A U T I O N
N O T I C E
N O T I C E
Table 3 List of cleaning solutions
Do not use
Products that contain ammonia
Concentrated bleach
Kerosene
Gasoline
Aromatic hydrocarbons
Possible cause
Table 3 shows the cleaning solutions to
Solution
Install the sensor in a location with no foam or
condensing moisture.
Keep wind away from the sensor. Contact
technical support for ideas for specific
environments.
Make sure that the sensor face is parallel with the
surface of the measurement target.
Select a different area to measure the target.
English 15