Maintenance; General Maintenance Guidelines; Filter Element Replacement; Figure 9 Filter Element Removal - Michell Instruments MDM300 User Manual

MAINTENANCE

4 MAINTENANCE
4.1

General Maintenance Guidelines

Routine maintenance of the system is confi ned to fi lter element replacement and regular
recalibration of the MDM300 or MDM300 I.S. sensor. For specifi c details on replacing
fi lter elements, please see Section 4.2.
In most applications, annual recalibration ensures that the stated accuracy of the
MDM300 Advanced Dew-Point Hygrometer is maintained. The exchange sensor scheme
is the most effi cient method of providing accurate annual recalibration with minimum
downtime.
Please contact Michell Instruments for more details.
Prior to recalibration being necessary, an exchange sensor can be ordered from Michell
Instruments or any authorized dealer. Once the sensor and calibration certifi cate has
been received it can be fi tted and the original sensor returned to Michell Instruments.
For more details of recalibration of the MDM300 please see the relevant user's manual.
4.2

Filter Element Replacement

Frequency of fi lter element replacement is primarily dependent upon the quantity of
contaminants present in the sample gas. If the gas is heavily laden with particulates or
liquids it is recommended to inspect the fi lter element on a regular basis initially, and
increase the time between inspections if the fi lter is found to be in good condition.
It is imperative that all fi lters are replaced before they become saturated. If a fi lter
element becomes saturated with contaminants there is a possibility that the performance
of the fi lter will be reduced, and contamination of the MDM300 sensor could occur.
!
To replace a particulate or coalescing fi lter element, proceed as follows:
1. Disconnect the U-shaped section of Swagelok
10
MDM300 Sampling System User's Manual
Before attempting to replace the fi lter always disconnect the
Sampling System from the sample gas and ensure that the
system is depressurized.
- I.S.
Filter Element Removal
Figure 9
tubing from the fi lter drain.
®
BYPASS VENT
SAMPLE INLET
MAX 100 BARG
BYPASS VALVE
(NV3)
97232 Issue 1.4, October 2016