Model 405 nm NO
2
/NO/NO
x
Monitor Manual Rev. D
6
3.
OPERATION
Please read all the following information before attempting to install the Model 405 nm
NO
2
/NO/NO
x
Monitor. For assistance, please call 2B Technologies at (303)273-0559.
NOTE:
Save the shipping carton and packing materials that came with the Monitor. If
the NO
2
/NO/NO
x
Monitor must be returned to the factory, pack it in the original
carton. Any repairs as a result of damage incurred during shipping will be
charged.
3.1. Shipping Box Contents
Open the shipping box and verify that it contains all of the items on the shipping list. If
anything is missing or obviously damaged, contact 2B Technologies immediately.
3.2. Pre-Operation Flow Settings of the Monitor
The Model 405 nm has two independent flows, which need to be verified and adjusted
before operating the instrument. The two volumetric flow rates measured and
independently adjusted are:
Cell Flow Rate (1400-1800 cm
3
/min):
The cell flow rate of sample gas and ozone/air
through the reactor volume and optical cell.
Ozone Flow Rate (60-80 cm
3
/min):
The flow rate of ozone/air mixed into the sample
flow stream.
These flow rates are adjusted to be in the ranges specified above at the factory.
However, due to changes in altitude and thus pressure, the two flow rates need to be
verified and adjusted to be within the specified ranges if necessary. To do this, follow
the flow rates on the LCD or serial output. The Cell Flow, displayed as
CF
, should be
in the range 1400-1800 cm
3
/min. This flow can be adjusted by the needle valve
located on the bac
k panel labeled “Cell Flow”. The Ozone Flow, displayed as
O3F
,
should be in the range 60-80 cm
3
/min. The Ozone Flow can be adjusted by the
needle valve located on the back panel labeled “O3 Flow”. Once these flows have
been verified and adjusted they should not need to be re-adjusted unless the
instrument
’s location changes in altitude. After adjusting the flow, the instrument
power should be cycled on and off before proceeding.
