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Installation and Configuration Manual 49
Calibration Check General MaintenanceUsing 795X Processing Electronics
Chapter 7
General Maintenance
7.1 Introduction
This chapter describes which procedures to take in the event of a fault developing with the 7827
digital viscosity meter system.
To use this chapter effectively, follow the options and investigate the possible causes as directed.
If the problem requires more effort than can be described in this document, contact Micro Motion for
further assistance.
This chapter covers the following:
• General maintenance
• Fault analysis
• Checking the Signal Converter
• Checking the power consumption
• Checking the installation
F
7.2 General maintenance
The 7827 meter system has no moving parts thereby reducing the maintenance requirements to simple
visual checks for leaks, damage to the meter and interrogating the 7950 and 7951 signal converters.
The following procedure is recommended for any periodic maintenance carried out on the system and
forms the basis of any fault finding task:
1. Examine the meter, its amplifier housing and cables for any signs of damage or corrosion.
2. Make sure that the spigot connection to the amplifier housing is tight.
3. Check the meter and flanging for signs of leakage.
4. Check that there is no ingress of water/fluid into the amplifier housing.
5. Ensure that the threads on the covers of the amplifier housing are well greased (graphite
grease) and that the 'O' rings are in good condition.
The electronics housing is designed for IP 66 environmental rating which means that,
providing the caps and plugs are correctly assembled, no moisture or dust is able to penetrate
through to the electronics.
The electronics housing is rated for explosion proof to Exd IIC and Class I Division Gas
Groups C & D classification. The covers MUST be completely screwed down and, in the case
of an explosion proof enclosure application, DO NOT FAIL to tighten the locking screws
(Aluminium enclosure 2.5 mm hex A/F; Stainless steel enclosure 2.0 mm hex A/F). (For more
information on the safety certification, see the Safety Certification appendix.)