Personal Ozone Monitor Manual Rev. E-2
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13. MAINTENANCE/TROUBLESHOOTING
The Personal Ozone Monitor is designed to be nearly maintenance-free. The only
component that requires routine maintenance is the internal ozone scrubber, which
should be changed at least once every six months (~4,000 hours) of operation.
Return the instrument to 2B Technologies for replacement of the internal ozone
scrubber.
Also, the inlet filter (user supplied) should be changed as recommended by the filter
manufacturer.
Other components with a limited lifetime are the air pump (~3,000 hours), lamp
(~20,000 hours) and solenoid valve (rarely fails). It is recommended that the
instrument be returned to 2B Technologies if any of these components fail.
The following are indications of various instrument malfunctions.
Air Pump Failure:
The instrument will not make a humming sound. Also, the circuit
breaker may prevent the instrument from powering up if the motor in the air pump
develops a short.
Lamp Failure:
The ozone measurements will be erratic and the Lamp Test will show
0.0 volts for the photodiode voltage.
Solenoid Valve Failure:
The ozone readings will be low and average to close to zero
if the solenoid valve is not switching. Partial switching of the solenoid valve will cause
the instrument to read low but not zero.
Contaminated Flow Path:
The instrument will typically have a large positive or
negative offset, and the ozone readings will be low once corrected for the measured
offset.
Help with trouble shooting is provided in the following table. Because the POM
instrument is constructed to be extremely compact, we recommend returning it to 2B
Technologies for any repairs or diagnostics that require disassembly (including
cleaning of the flow path and/or replacement of the internal mercury scrubber, pump,
lamp, or solenoid).
