H2/O2 Hydrogen/Oxygen Gas Monitoring Analyzers for Nuclear Applications from Meggitt Safety Systems - smart engineering for extreme environments

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Meggitt Safety Systems

Maintenance

Scheduled maintenance tasks have been identified to enhance the overall reliability and accuracy of the system. This is accomplished through the following activities:

Provide periodic adjustments of calibration factors to compensate for allowable component drift
Verification of overall CAMS operational capability
Scheduled replacement of limited life components (parts subject to wear-out or limited by qualified life)

The following is a tabulation of maintenance activities, along with recommended frequency and a brief description of the task. The frequency column represents the maximum interval between performance of the activity. For Category 1 applications, the maximum interval should not be exceeded except under conditions identified in the table.

Activity	Frequency	Task
Primary Calibration	90 days	Initiate auto cal to a partial pressure sensor two point check. Record total pressure for future reference.
Pump Motor Assembly	12 Months	Inspect motor mounting hardware and, if Sample Station is normally in Standby, check motor insulation resistance.
Conditioner Status	18 Months	Check Transducer Drive Voltage, Power Supply Outputs and DAC Outputs
Pump Motor Assembly	18 Months	Verify dead-head pressure. Rebuild if significant change.
Alarms	18 Months	Verify Alarm Functions
Cal Gas Supply	36 Months	Check Gas Cylinder pressures and note usage rate. Leak check supply manifold if usage rate is excessive. Update Cal Gas Data if cylinders are changed.
Pressure Transducer (RTD if Applicable)	36 Months >	Perform two point check of the total pressure (and, if applicable, temperature) measurement function. Update factors as needed.
Pump Motor Assembly	36 Months	Refurbish pump. If pump operation is intermittent, it can be deferred to 60 months.
Pump Motor Assembly	5 Years	Rebuild Pump. If in continuous operation, pump rebuild should be every 36 months.
Partial Pressure Sensors	10 Years	Replace Partial Pressure Sensors
Solenoid Coil Replacement	14 Years	Replace Coils for 1E Asco Solenoid Valves. Operating life is based on 109°F ambient temperature and may be extended if unit is operating at a lower ambient temperature or is normally in Standby mode.