Analytical Industries AII-4001 Helium Oxygen Trimix Analyzer - Manual (Page 7)

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6 Maintenance
The AII-4001 contains no moving parts and other than a periodic wipe down
requires no routine maintenance.
The expected life of the Helium sensor is 10 years and along with the environ-
mental sensor module should last for the life of the analyzer, unless subjected
to contact with liquids or excessive shock from the analyzer being dropped.
The expected life of the Oxygen sensor is 5 years in air (20.9%) at 25⁰C (77⁰F)
and 1 atm. To obtain maximum sensor life, avoid subjecting the analyzer to
high temperatures any longer than necessary and expose or flush the Oxygen
sensor with clean air after analysis of high oxygen concentrations.
Sensors and the battery are easily replaced in the field. Dispose of old sensors
and batteries in accordance with local regulations.
Sensor Replacement:
1) Open the case in a clean dry environment.
2) Remove the manifold from the sensors, if neces-
sary.
3) Remove the 4 screws securing the front panel
4) Remove the front panel from the case
5) Stand the front panel on the side panel
6) Unplug the sensor from the PCB using small thin
blade screwdriver, white oval illustrated at right
7) Unscrew the nut securing the sensor to the front
panel
8) Pull the threaded end of the sensor out of the
front panel
9) To install a new sensor, reverse the steps above
Battery Replacement:
1) Open the case in a clean dry environment.
2) Follow the sensor replacement procedure to gain clear access to screws
securing the battery clamp.
3) Disconnect battery (4 pin) and charge (3 pin) jacks at the PCB using small
thin blade screwdriver, red oval illustrated above.
4) Loosen battery clamp screws, yellow oval illustrated above.
5) Slide battery out of clamp to remove.
6) To install a new battery, reverse the steps above.
Note: Discharging the battery 50% before charging yields approx 500 cycles.
Discharging the battery 30% before charging yields approx 1,200 cycles.
7 Replacement Parts & Optional Accessories
To maintain optimum performance service the AII-4001 using only OEM parts
obtained from Analytical Industries Inc.
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Replacement Parts
AII-11-75D Oxygen Sensor
AII-41-100 Helium Sensor
AII-E3 Environmental Sensor
A-1185 PCB Assembly, Main
A-3606 Battery Assembly
A-3582 Flow Manifold
A-3609 Dome Adapter
TUBE-1018 Sample Tubing 1/8” ID 1/4” OD
PWRS-1003-1 9 VDC Charger 110/220 VAC Adapter
MANL-4001 AII-4001 Owner’s Manual
A-3607 Charger Wiring Assembly
A-3597 Case Lid Instruction Panel
Optional Accessories
PWRS-1019 9 VDC Cigarette Lighter Adapter
A-3673 Adapter, BC with Restrictor to 1/8” Tube
A-3677 Adapter, DIN to 1/8” Tube
A-3678 Adapter, A-Yoke to 1/8” Tube