CDP301 Dew-Point Tester User’s Manual
36 97585 Issue 1, June 2020
MAINTENANCE
5 MAINTENANCE
System operates under high pressure!
Isolate and depressurise the sampling system before
attempting any maintenance or servicing
Routine maintenance of the CDP301 is conned to regular lter replacement and mirror
cleaning. We would also recommend that periodic pressure leak testing is carried out on
sample system components, especially if they are being transported with the CDP301
system.
5.1 Calibration
Each CDP301 is factory calibrated by measurements of high-purity ethane vapour.
The condensation temperature with variation in pressure of ethane is well dened,
enabling the correct operation of the cooled-mirror sensor to be determined. The rapid
condensation rate of this single component calibration gas, with virtually instantaneous
precipitation onto the mirror surface at the dew-point temperature, enables the +/-
0.5˚C (0.9°F) accuracy specication of the CDP301 to be conrmed and certied.
Annual re-calibration of the CDP301 is recommended. This service is available throughout
the global network of Michell Instruments Sales and Service Centres and authorized service
partners. Alternatively, a user may themselves validate the measurement performance
of the CDP301 by performing a series of measurements of a dened test gas. High-
purity (99.5%, preferably 99.9%) ethane or n-propane can full this requirement and
for which Michell Instruments will be pleased to provide tables indicating HC dew-point
temperature over a range of test pressures.
5.2 Filter Element Replacement
Life expectancy of the lter element is dependent upon operating conditions in each
specic application. As a minimum, it is recommended that the lter element be replaced
every 12 months. If inspection of the removed element shows that it is in poor condition,
then the operating period between replacements can be reduced accordingly.
If the CDP301 has a Michell-supplied sample system, the lter element is part of that
system supplied and is easily accessible.
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