Casella CEL Thermohygrograph deluxe model - Manual (Page 9)

5. MAINTENANCE & SPARES
5.1 Routine Care
No routine maintenance is required.
Do not oil spindle pivots as this attracts dust which may make the
movement slow and can cause inaccuracy. If the instrument is used in a
dusty environment use a fine brush to remove any dust from the hair and
linkage pivots.
Do not wash the hair with water, except at long intervals or for special
reasons, as wetting the hair will upset the calibration temporarily.
5.2 Quartz Clock
The quartz clock should not require any attention, apart from battery
replacement. Quartz movements contain no parts that can be serviced by
the user. If the clock fails, a replacement must be obtained from Casella at
Bedford.
5.3 Cleaning
Cleaning may be carried out by using a soft damp cloth. Solvents or other
cleaning products should not be used.
5.4 Service
The original setting of the temperature element will remain correct for a long
period and will only need attention in the case of damage. The humidity
element does not have such a long life and will need replacement. The
interval depends on exposure and general care during use.
Indication of the need for replacement is when checks on accuracy show
large errors, when re-adjustment is needed very frequently, or erratic
hysteresis errors are noted.
When a temperature check and a humidity check are necessary, the
temperature check must be carried out first.
Casella'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.
Maintenance
Page 9 of 12
THERMOHYGROGRAPH deluxe
User Manual