Michell Instruments Cermet II User Manual

Cermet II User’s Manual
Michell Instruments 25
MAINTENANCE
5 MAINTENANCE
Calibration
Routine maintenance of the Cermet II Transmitter is confi ned to regular re-calibration
by exposure of the transmitter to sample gases of known moisture content to ensure
that the stated accuracy of the transmitter is maintained. Calibration services traceable
to the UK
National Physical Laboratory (NPL) and the US National Institute of Standards
and Technology (NIST) are provided by Michell Instruments.
Michell Instruments offers a variety of re-calibration and exchange transmitter schemes
to suit specifi c needs. A Michell representative can provide detailed, custom advice (for
Michell Instruments’ contact information go to www.michell.com).
Transmitter Guard Replacement
The transmitter is supplied with a white HDPE guard (standard) or a stainless steel
guard (if specifi ed at time or order). The method of replacement is the same for both
types.
HDPE Guard
The HDPE guard provides <10μm protection to the dew-point sensor. It is designed
to show any contamination and the guard should be changed if the surface becomes
discolored.
When replacing the guard, care should be taken to handle the guard by the bottom part
only. Replacement guards (EA2-HDPE) - pack of 10 - can be obtained by contacting
Michell Instruments (www.michell.com) or your local distributor.
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Figure 21 Replacement of HDPE Guard
Stainless Steel Guard
The stainless steel guard provides <80μm protection to the dew-point sensor. It is
designed to show any contamination and the guard should be changed if the surface
becomes discolored.
When replacing the guard, care should be taken to handle the guard by the bottom part
only. A replacement guard (SSG) can be obtained by contacting Michell Instruments
(www.michell.com) or your local distributor.
Bonded Seal
If the installed bonded seal gets damaged or lost, a pack of 5 replacement bonded seals
can be obtained by contacting Michell Instruments, or your local distributor, and quoting
part number BS-58-PK5.

Michell Instruments Cermet II Specifications

General

Brand	Michell Instruments
Model	Cermet II
Category	Measuring Instruments
Language	English