Michell Instruments Easidew DryCheck, Руководство пользователя

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Easidew DryCheck User’s Manual
Michell Instruments 23
GOOD MEASUREMENT PRACTICE
5 MAINTENANCE
5.1 General Maintenance Guidelines
Routine maintenance of the Easidew DryCheck is confined to filter element replacement
and regular recalibration of the dew-point transmitter.
5.2 Calibration
Routine maintenance of the transmitter is confined to regular re-calibration by exposure
of the transmitter to sample gases of known moisture content to ensure that the stated
accuracy 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 sensor schemes to
suit specific needs. A Michell representative can provide detailed, custom advice (for
Michell Instruments’ contact information go to www.michell.com).
5.3 Transmitter Maintenance
To replace the transmitter proceed as follows:
Always de-pressurize the system and disconnect any electronic
supplies before commencing maintenance.
1. Open the transparent front cover.
2. Remove the four screws securing the aluminum front panel.
3. Carefully lift the front panel to expose the transmitter.
4. Remove the electrical mini DIN connector from the transmitter by loosening
the connector-securing screw and pulling it away from the transmitter.
5. Unscrew the transmitter from the block using a 27AF spanner/wrench.
6. Fit a new transmitter and fully tighten to a minimum torque of 30.5Nm.
7. Repeat the above instructions in reverse order.
Transmitter
h
h
Mini DIN
Connector
Figure 15 Sensor Removal