SIGNAL GROUP LTD
s/sales/masters/manuals/noxgman.doc Page 14 of 17
4.01
OPERATION
WARNING:
DO NOT LEAVE OZONE ON WITHOUT GAS FLOW
1.
Ensure that all connections have been made in accordance with the
installation instructions.
2.
Set 10 psig or 0.75 bar gauge (approx.) to regulators of both the span
gas and NO cylinder and the oxygen/air cylinder.
3.
Balance the NO and NOx modes of your NOx analyser, ensuring they
both zero and span correctly. Select no mode.
4.
Press the Power ON switch but not the Ozone switch at this stage.
5.
Select OFF position for oxygen.
6.
Adjust the span flow control to a suitable rate for your NOx analyser and
leave to settle until a suitable reading of the NO span gas is
obtained on the
analyser.
7.
Open the oxygen ON/OFF flow valve on the Noxgen front panel (G)
and
adjust the flow of this oxygen using the flow control (I) until the analyser reading
falls by about 10% of the original reading in step 6.
Record this reduced
reading (Reading A).
8.
Switch on the ozone using the Ozone ON/OFF button B and adjust the
ozone level using both the coarse adjust switch (H) and the fine
thumbwheel adjust switches (F).
This adjustment should be made until the analyser reading is further
reduced so that it is now about 20% of the reading taken in Step 6. At
this stage the ozone in the Noxgen is converting the NO span gas to
NO2 and the fall in reading corresponds to the level of NO2 now being
generated. Whatever you do, always allow 10% of the reading in Step
6 (A) to remain. Record this new reading from the analyser (Reading B).
9.
Having recorded a stable reading B, switch the analyser to the NOx
mode and wait for a steady reading. Record this reading (Reading C).
