Portable Oxygen Analyzer Service Manual
Teledyne Analytical Instruments 31
Service Manual 3.1 General Service Information
The Teledyne Model AX300-I portable oxygen analyzer is designed to be
robust yet compact in size. In order to achieve maximum reliability in a
microprocessor-based instrument, a single PC board is used which relies exclusively
on surface mount technology. Without access to specialized probes and test
equipment, troubleshooting and repair of circuit board components are not feasible.
A factory replacement of the entire PC board is more cost effective than a field
repair of an individual component.
With the exception of replacing the sensor or batteries there are no user-
serviceable components inside the unit. There are no potentiometers or other
adjustments to be made within this instrument. If a problem arises with either of
these models that cannot be corrected by recalibration, changing the batteries or
replacing the sensor as described in this manual, the unit must be sent back to the
factory for repair or replacement. See Section 3.10 for instructions on obtaining a
Return Merchandise Authorization (RMA) number before sending a unit back to
Teledyne for repair.
3.2 Overall Maintenance
The AX300-I instrument requires very little maintenance, other than
calibration, checking and changing the batteries and sensor, and cleaning the
plastic housing. Occasional cleaning of the plastic surface can be done with
isopropyl alcohol. Should any part of the instrument malfunction or fail to
perform, the unit should be removed from service. There are no user-serviceable
components within the instrument.
3.3 Battery Maintenance
DO: Test batteries regularly. (replace immediately when all 5 bars are
missing).
DO: Always use alkaline batteries.
DO: Recalibrate after replacing batteries.
The AX300-I instrument incorporates a bar graph that continuously displays
the approximate amount of useful life remaining on the set of installed batteries.