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The output of the O
the Setup>Vars>O3 Gen Mode menu:
•
•
See Section 9.7 for more details on the operation of the O
In addition to the diluent gas, calibration source gas, and gas output connections discussed
in the preceding sections, this option also requires an O
EXHAUST outlet on the output panel of the T750.
Note
O
G
ENERATOR WITH
3
The photometer option increases the accuracy of the T750 calibrator's optional O
generator by directly measuring O
The photometer's operation is based on the principle that ozone molecules absorb UV light
of a certain wavelength. A mercury lamp internal to the photometer emits UV light at that
wavelength. This light shines down a hollow glass tube that is alternately filled with sample
gas (the measure phase), and zero gas (the reference phase). A detector, located at the other
end of the glass tube, measures the brightness of the UV light after it passes though the gas
42
Table 2-5. Valve States for T750 Calibrator with Optional O
MODE
Generate Source Gas
Generate O
3
Leak Check 0-17%
Leak Check 17%-100%
GPT
GPTZ
GPTPS
STANDBY
Only present if multiple cal gas MFC option is installed.
1
2
The valve associated with the cylinder containing the chosen source gas is open.
3
In instruments with multiple MFCs, the CPU chooses which MFC to use depending on the target
gas flow requested.
generator can be controlled in either of two ways, configured through
3
CONSTANT mode: By selecting a specific, constant drive voltage
(corresponding to a specific O
BENCH mode: The user selects a desired O
calibrator's CPU sets the intensity of the O
voltage corresponding to that concentration.
• The EXHAUST line must be vented to atmospheric pressure
using maximum of 10 meters of ¼" PTFE tubing.
• Venting must be outside the shelter or immediate area
surrounding the instrument.
P
HOTOMETER
content of the gas output by the generator.
3
VALVES
(X = Closed; O = Open)
D = Degenerized; E = Energized
DILUENT
CYL
O
3
GPT
IN
GEN
IN
O
2
O
D
D
X
O
D
E
X
O
D
D
X
X
D
D
O
2
O
E
E
O
O
E
E
X
O
D
E
X
O
D
D
concentration) for the generator, or;
3
concentration, and the
3
generator's UV lamp to a drive
3
generator.
3
exhaust line be connected to the
3
O
PTION
Generator.
3
MFCs
CAL1
CAL2
1
DILUENT
ON
3
ON
3
ON
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
3
ON
3
ON
ON
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
3
083730750B DCN8606
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Troubleshooting
