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7. Connect the ozone delivery line to the ¼” inlet fitting on the bottom of the
filter assembly. This assembly is located on the bottom face of the enclosure
(See Figure 1.3.) The ozone delivery pressure should be regulated to no more
than 30psig. All tubing used should be made of ozone resistant material such
as PTFE(Teflon™) or PFA. If new, unconditioned tubing is used for the
ozone delivery line, the ozone concentration may be affected until the tubing
becomes conditioned. Pre-conditioned ¼” tubing can be purchased from
Teledyne API. Contact the API sales department and reference part number
02639.
8. If the M450H has been configured with the auto-zero valve option, connect
the oxygen or other zero gas source to the ¼” tube fitting labeled ‘Zero Gas
Inlet.’ Do not exceed 30 psig in the zero air delivery line.
CAUTION
Exhaust gas from the M450H may contain dangerous levels of
ozone!
NOTE
The zero gas used must be clean and free of particles. If the gas
contains particulate contamination, install a particulate filter in
the zero air line. You can purchase an appropriate filter from
Teledyne API.
9. With the ozone delivery line pressurized, adjust the ozone flow rate using the
needle valve mounted below the sensor inside the instrument. The flow-rate
should be set from 0.5 to 2.0 liters/min. The flow-rate required will depend
on your system. As a general guideline, the flow should be set to the lowest
value that will still achieve an acceptable response time from the instrument.
The lower the flow, the slower the response will be. If a long length of tubing
is used for the ozone delivery line then the flow-rate may need to be increased
so that the ozone concentration will not degrade in the sample line.
10. Turn on the M450H by switching the power switch on the front panel. The
front panel display should light with a sequence of messages, -API - M450H -
software version number, then a normal display as shown in Figure 2.2.
11. Allow about 10 minutes for the UV lamp temperature to come up to it’s set-
point then press the TST> button on the front keyboard to scroll through the
TEST values. Compare these values to those noted during the final factory
checkout listed in Table 1.3. The values observed should closely match the
Table 1.3 values.
P/N 02826B1 Teledyne API Model 450H O
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Monitor Instruction Manual - Page 15