Teledyne MODEL T703 Manual Do Utilizador
Theory of Operation
Teledyne API T703 Calibrator Operation Manual
176
9.6.4.2. Pneumatic Sensors for the O
3
Photometer
The several sensors located on the pneumatic sensor just to the left rear of the O
3
generator assembly measure
the absolute pressure and the flow rate of gas inside the photometer’s absorption tube. This information is used
by the CPU to calculate the O
by the CPU to calculate the O
3
concentration of the sample gas (See Equation 9-7). Both of these
measurements are made downstream from the absorption tube but upstream of the pump. A critical flow orifice
located between the flow sensor and the pump maintains the gas flow through the photometer at 800 cm
located between the flow sensor and the pump maintains the gas flow through the photometer at 800 cm
3
/min.
The following TEST functions are viewable from the instrument’s front panel:
PHOTO FLOW - The flow rate of gas through the photometer measured in LPM.
PHOTO SPRESS – the pressure of the gas inside the absorption tube. This pressure is reported in
PHOTO SPRESS – the pressure of the gas inside the absorption tube. This pressure is reported in
inches of mercury-absolute (in-Hg-A), i.e. referenced to a vacuum (zero absolute pressure). This is not
the same as PSIG.
the same as PSIG.
07223B DCN6378