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Operation and Maintenance Manual 65
Display Output Controls
Signal Controls
The SCD and NCD use analog amplifier circuitry for the measurement of the
current produced by the photomultiplier tube. Two Front Panel Controls are
used to adjust the output signal of the Detector.
Turns ozone generator ON or OFF.
Functions in both ON and STANDBY modes if the
pump is producing sufficient vacuum.
Controls the range of the front panel display
between high sensitivity (0.1-200mV) and low
sensitivity (0-2V). Does not affect recorder
output signal.
Displays the output signal of the SCD in
millivolts. (Note: Changing the output range of
the SCD by adjusting the recorder switch on the
back panel does not change the range of the
display.)
Displays the pressure of the chemiluminescence
reaction chamber in Torr (mm Hg)
Changes the gain of the amplifier by a factor of
100. For high sensitivity measurement of sulfur
or nitrogen compounds (measurement of low
levels of sulfur or nitrogen compounds), the
attenuation should be operated in the 1 position.
For samples containing high levels (ppm to
percent) of sulfur or nitrogen compounds, use
the 100 position.