Hach HIAC HRLD-100 Manuel D'utilisation page 9

Maintenance
D A N G E R
Multiple hazards. Only qualified personnel must conduct the tasks
described in this section of the document.
Clean the sensor and the microcell
D A N G E R
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.
D A N G E R
Personal injury hazard. Never remove covers from the instrument. This
is a laser-based instrument and the user risks injury if exposed to the
laser.
N O T I C E
Damage to the sensor can occur if connected or disconnected while powered.
Always remove power from the instrument before making electrical connections.
N O T I C E
Potential Instrument Damage. Delicate internal electronic components
can be damaged by static electricity, resulting in degraded
performance or eventual failure.
Sensor body: Examine the sensor periodically for debris and deposits.
Clean the sensor when there is a build-up of deposits. Use a clean,
damp, lint-free soft cloth to remove loose debris from the sensor body.
Microcell: Clean the microcell monthly and also when:
• a clean sample goes through the microcell and returns very high
counts are noted in the lower channels
• an over concentration indications are shown on the counter
• a Baseline Hi sensor message is found
Clean the HRLD 150/150-JA Sensor cell
N O T I C E
If a facility air source is used to clean the sensor, make sure that the facility air
system does not contain suspended oil or produce water droplets that will
interfere with sensor cleaning.
1. Set the counter power to off.
2. Purge the sensor of any sample and flush the sensor with a suitable
miscible liquid. If necessary, prepare the sensor microcell for water
miscible liquids.
3. Remove the sensor from the sampler.
4. Blow either clean dry filtered air or "canned air" through the outlet
port of the sensor for about 1 second to dry the microcell. Refer to
Figure 5.
5. Make sure that the sensor microcell is not blocked. Refer to
If the microcell slit is clogged, refer to
on page 11.
6. Install the sensor and make sure that the orientation of the inlet and
outlet ports is reversed. The flush flow should be in the opposite
direction of the sample flow through the sensor.
7. Flush with clean (filtered and de-ionized) water repeatedly.
Note: Use a 5% solution of Contrad 70 for periodic cleaning and use a 50%
solution of Contrad 70 for heavily contaminated sensors. If this does not solve
the problem, flush the sensor with alcohol.
8. After the sensor microcell is flushed with the cleaning liquid, rinse the
microcell with clean particle free water.
9. Install the sensor on the sampler configured in the original orientation
(inlet/outlet ports). Make sure that the system has no leaks and, as
necessary, prepare the sensor for oil applications.
Figure 6.
Clean a blocked microcell
English 9