Principles of Operation Teledyne API T703/T703U Calibrator Operation Manual
208
The following TEST functions report these temperatures and are viewable from
the instrument‟s front panel:
PHOTO LAMP TEMP - The temperature of the UV Lamp reported in ºC.
PHOTO STEMP - The temperature of the Sample gas in the absorption tube
reported in ºC.
Pneumatic Sensors for the O
3
Photometer 9.6.4.2.
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
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
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 inches of mercury-absolute (in-Hg-A), i.e. referenced
to a vacuum (zero absolute pressure). This is not the same as PSIG.
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