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HARTRIDGE LIMITED
5. Maintenance
5.1
Regular Maintenance
Each Use
1. Switch on the Audit Test Box and set into 'CAL' mode with a pressure transducer connected.
Ensure the reading is 5.000 ±2.
If the reading is out of tolerance, change the 9V battery in the rear of the Test Box.
Note -
Lithium batteries should generally give a longer life.
Consider carrying a spare battery.
Consider using rechargeable batteries (NiMH), ensure that the battery charger is
compatible with the type of rechargeable battery used. Also be aware that rechargeable
batteries self discharge even when not in use (20-25% per month).
Dispose of batteries with care, many types are toxic.
Use collection and recycling facilities where they exist.
2. Inspect sealing faces before fitting equipment to a machine.
Annually
The AE72 Audit Test Box and transducer must be re-calibrated as a pair against a master reference
held at Hartridge Ltd., and a calibration certificate issued. The PTD Simulator accuracy should also
be checked annually. Contact Hartridge Ltd customer support for further details.
5.2
General Cleanliness
The kit should be kept clean. Contamination on the sealing faces or threads can cause leaks,
degrade seals and enter the fuel systems of host machines, causing blockages and potential
damage to equipment.
1. Ensure that all threads and pressure ports are sealed when not in use with dust caps.
2. The display window of the Audit Test Box may be wiped clean with a damp, non abrasive cloth.
3. Keep the contacts of the PTD Simulator connector and the cable adaptor assembly clean to
avoid poor connection and inaccurate readings.
HL078 (EN), Issue 1, AT3376, 04/2018
HM1023 (AE72) Operating and Servicing Manual
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