SF72 Transmitter User’s Manual
Michell Instruments
9
MAINTENANCE
4 MAINTENANCE
Calibration
Routine maintenance of the SF72 is con
fi
ned to regular re-calibration by exposure of
the SF72 to sample gases of known moisture content to ensure that the stated accuracy
of the SF72 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 re-calibration service to suit speci
fi
c needs. A Michell
representative can provide detailed, custom advice (for Michell Instruments’ contact
information go to www.michell.com).
Sensor Guard Replacement
The sensor is supplied with a white HDPE guard (standard) or a stainless steel guard
(if speci
fi
ed at time or order). The method of replacement is the same for both types.
HDPE Guard
The HDPE guard provides <10
μ
m 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.
x
HANDLE,
USING
GLOVES, BY
BLACK PART
ONLY
S/
N
o
.
F
A
0
0
-2
9
3
P
ro
du
ct
C
o
d
e
:
S
F
7
2
-T
-
6
0
/
+
6
0
SF
72
T
ra
n
s
m
i
S
ca
le
d
R
a
n
-
-
Figure 11
Replacement of HDPE Guard
Stainless Steel Guard
The stainless steel guard provides <80
μ
m 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 5/8-BS.
Содержание SF72
Страница 8: ...SF72 Transmitter User s Manual viii 97325 Issue 4 May 2018 ...
Страница 19: ...SF72 Transmitter User s Manual Michell Instruments 11 APPENDIX A Appendix A Technical Specifications ...
Страница 26: ...SF72 Transmitter User s Manual Michell Instruments 19 NOTES ...
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Страница 28: ...http www michell com ...