Model 106-H Ozone Monitor Manual Rev. D-2
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4.
MAINTENANCE/TROUBLESHOOTING
The Ozone Monitor is designed to be maintenance-free. The only component with a
limited lifetime is the lamp, which has a lifetime of ~20,000 hours. It is recommended
that the instrument we returned to 2B Technologies if any component fails.
Alternatively, the user may install components at their own risk. In that case, please
contact 2B Technologies for instructions.
The 106-H has four status LEDs on the front plate to indicate any system issues that
may require troubleshooting:
Cell Dirty:
When an auto-zero is being conducted, this light will activate if the
absorption cell is too dirty (i.e., the ratio of the sample photodiode voltage to the
reference photodiode voltage is less than 0.5). This status light can only be
activated during the zeroing function when the cell is purged with zero gas. The
normal state is OFF.
Invalid Reading:
This function is not yet operational. In a future revision, the LED
will indicate when there is insufficient flow through the instrument. The normal
state is OFF.
Low Lamp:
Indicates that the lamp intensity, measured by the reference
photodiode, is below 0.6 volts. The normal state is OFF.
Power On:
Indicates that there is power to the instrument and that the main circuit
board is working properly. The normal state is ON.
The following are indications of various instrument malfunctions. Refer to the labeled
photos in Section 7.
Table 4.1. Troubleshooting the Ozone Monitor for performance problems.
Problem/symptom
Likely cause
Corrective action
Instrument does not
turn on (Power On LED
is OFF).
Power not connected
properly or circuit breaker
open.
Power switch has become
disconnected
Check external power
connection for reverse
polarity or a short and wait a
few minutes for the thermal
circuit breaker to reset.
Open instrument and push
power cord back onto
connector (see Fig. 7.1)
Lamp Low LED is ON.
The lamp intensity is low.
If the reference photodiode
voltage is near 0.6 volts, the
instrument may still function
properly, but the lamp should
be replaced when possible.
