Casella CEL Software for the Microdust dust monitor - Manual (Page 49)

5. MAINTENANCE & SERVICING
5.1 Service Department
Casella CEL’s in house service department offers a comprehensive range of
repair and calibration services, designed to effect a fast and efficient back-up
for all our products. The Service Department is operated under the scope of
our BSI registration for products manufactured by us. We will however,
undertake the repair of other manufacturers equipment. For further
information please contact our service department at our Bedford
headquarters. We will be happy to provide quotations for individual repairs or
provide annual maintenance under contract.
We recommend factory service by technicians trained and equipped to repair
your instrumentation. Should you wish factory repair assistance, send your
equipment in a package equivalent to the original packaging. Insure to full
value and ship pre-paid. Include a letter giving full details with your packing
list.
Send to: Casella CEL Ltd
(Service Department)
Regent House
Wolseley Road
Kempston
Beds MK42 7JY
United Kingdom
For service outside the United Kingdom, please return to our appointed
distributor.
5.2 Lens Contamination
As with all optical dust measurement equipment, lenses may eventually
become contaminated with particulate that has settled on the surface. In the
long term, this can reduce the instrument’s reading for a given dust
concentration or cause difficulty in achieving a stable zero indication. By
careful design of the optics and measurement chamber, the need for regular
cleaning of the lenses has been greatly reduced.
5.2.1 Long Term Monitoring
For long term sampling or where high contamination levels are anticipated,
continuous purging by a source of dry filtered air is recommended. Use one
of the pumps from the Vortex series. The flow rate to the purge inlet should
be maintained at approximately 10% of the main sample rate.
When continuous purging is adopted, it is necessary to draw the aerosol
through the probe’s measurement chamber using an aspiration technique.
Page 49 of 60
Maintenance
& Servicing
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