Maintenance; Calibration - Michell Instruments Condumax II User Manual

Condumax II User's Manual
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MAINTENANCE

The design of the Condumax II sensor cell and measurement system is such that no
specifi c routine maintenance is required. However, if a fault does occur with the system
that is not covered within this manual please contact Michell Instruments (see contact
information at www.michell.com) or your local representative.
4.1

Calibration

In order to maintain the calibration to factory standards, Michell Instruments
recommends that the hydrocarbon dew-point sensor cell assembly is replaced after
every 24 months service, in order to refresh the analyzer's certifi ed calibration and as
an effective preventative maintenance routine. (All critical measurement and operation
devices are contained within the analyzer cell assembly: light source, detector, peltier
heat-pump, optical surface and temperature sensor). A spare cell can be ordered to
be held in the site stores. The replaced cell assembly can then be returned to Michell
Instruments for full refurbishment, test, calibration and re-certifi cation, to replenish the
user's spares stock. For more information refer to Section 1.2.4.
Michell Instruments recommends that the water dew-point sensor should be returned
for calibration on a 12 monthly basis to ensure optimum operation. Michell Instruments
offers a calibration exchange program, where a replacement sensor can be supplied
as an operational replacement and the original item returned to Michell to complete
the exchange. Replacement sensors are fully inter-changeable, 'plug and play', with
calibration characterization data held in on-board non-volatile memory such that no
user programming or confi guration setting is required at time of replacement.
NOTE: The water dew-point sensor calibration intervals may need to be
reduced if the operation of the sensor is within potentially aggressive or
corrosive sample media (such as sour natural gas). The interval may therefore
need to be shortened to 6 months (or lower in extreme cases) in order to
maintain satisfactory analyzer performance.
Michell Instruments
The power to the enclosure must be turned off before any
work is carried out in the measurement system enclosure.
Observe de-energize durations.
Gas line connections to the measurement system must be
isolated and de-pressurized before any work commences.
Before powering up the instrument the 'Start up purge
procedure' must be carried out. See Section 2.6.
Any loose or disturbed pipework or couplings must be leak
MAINTENANCE
tested.
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