CASELLA CEL CEL-712 - General Maintenance

CEL-712 Microdust Pro Real-time Dust Monitor
56 Casella Measurement
measurement ranges (especially 2.5 mg/m³) will become disabled. The
instrument will however continue to operate on higher ranges.
Cleaning the lens
1. Attach the air purge bellows to the probe’s purge inlet.
2. Move the probe collar to open the sampling chamber.
3. Pump vigorously to blow clear any dust or contamination on the lens
surface.
Continuous purge technique
For specialist long-term sampling applications, or where you expect to make
high concentration measurements, it is possible to use a continuous source of
clean, dry and filtered air to purge and protect optical components within the
probe. Maintain a purge flow rate of approximately 5-10 % of the main sample
rate.
Whenever continuous purging of probe optics is used, the particulate sample
must be drawn into and through the probe’s measurement chamber by the use
of a larger sampling flow rate. If you do not do this, the clean air used for
purging will prevent entry of particulate matter. The purge air flow will have a
dilution effect and for this reason it is recommended that the entire sampling
system is calibrated against a gravimetric result to achieve optimum accuracy.
If the probe optics become heavily contaminated, it will be necessary to return
the instrument to Casella Measurement for cleaning and re-calibration. Note
that the instrument warranty does NOT cover this operation or general
servicing of the instrument.
9.2 General maintenance
 Use a clean, slightly damp cloth to wipe the outside of the instrument.
Do not use abrasive, caustic or solvent materials to clean the
instrument.
 Check the condition of the battery compartment when you fit batteries
to the instrument. Check for signs of corrosion and arrange any repairs
necessary.
 Remove the batteries from the instrument if it will not be used for a long
period of time (more than one month).
 Do not allow the instrument to become wet. Avoid sampling high
humidity or wet particulate samples. When moving instrument from a
cold to warm environment, condensation on optical components may
temporarily disturb correct operation.
 The Microdust Pro is a sensitive optical instrument. Avoid severe
mechanical shocks or dropping.