Model 306 Ozone Calibration Source Manual Rev. G-1
13
ozone from the stainless steel outlet on the back of the instrument (Figure 10-1 or 10-
2) until you enter menu again and change the target concentration. As an example,
the display will read as follows
Target= 200 ppb
delT=-0.1
▌▌▌▌▌▌
if you have chosen 200 ppb as the target concentration. The deviation of the
photolysis chamber temperature from the target temperature is displayed in addition to
a series of six solid or open bars. When all bars are solid, the lamp intensity is within
range to produce the target concentration.
The selected target ozone concentration will remain in memory until the next time you
change it. Bear in mind that the instrument will output up to 1,000 ppbv of ozone
reliably. Higher concentrations may be chosen, but the instrument may not be
capable of delivering the concentration chosen. For higher target concentrations, you
will need to independently measure the maximum concentration of ozone that the
instrument can output and regulate.
While generating ozone in the target amount, the flow rate may be checked by rotating
the select switch. It should be in the range of 4 L/min.
To cease generating ozone, push in the select switch until the main menu appears.
4.4
Start Step Menu (Stp)
Choosing
Stp
executes the program of concentration steps you have stored in
memory (under
Cfg/Prg
). The target concentrations are displayed as the instruments
steps through the program. For example, the first display might read
Step[1]=100 ppb
delT=0.2
▌▌▌▌▌▌
if you have chosen 100 ppb as the target concentration for your first step and the
photolysis chamber is higher than the target value by 0.2°C. The six solid bars
indicate that the cell temperature and lamp intensity are within range for accurate
output of the selected ozone concentration. The flow rate may be checked by rotating
the select switch (should be ~4 L/min). To advance through the steps you have
programmed, push in the select switch. To cease generating ozone, push in the
select switch until the main menu appears.
4.5
Zero Menu (Zer)
This submenu provides a rapid way to produce air containing 0 ppbv of ozone. In this
mode, the photolysis lamp is turned off. While producing 0 ppbv of ozone, the flow
rate may be checked by rotating the select switch. To exit, push in the select switch
until the main menu appears.
