Philips M3000A, Руководство по обслуживанию

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Sidestream CO
2
Measurement
52 Introduction to the Instrument
Detectors
The detectors are used to detect the reference signal (the signal which comes directly from
the IR source) and the main signal (the signal which passes through the sample cell).
Pressure Sensor
The pressure sensor is used to measure the ambient pressure during the auto zero process and
to measure the pressure in the measurement cell during measurement mode.
Analog Section
The analog section amplifies and digitizes the main, reference, pressure and temperature
signals.
Controller and Peripherals
The controller reads the digitized values from the analog section and calculates the CO
2
wave
and numerics based on the measured main, reference, pressure and temperature signals. The
controller also controls the CO
2
frontend based on the control information received from the
Measurement Server, the Optical Code Recognition and the measured cell pressure.
Gas Inlet with Optical Code Recognition
The gas inlet allows the connection of Microstream FilterLines. The Microstream FilteLines
are detected by the Optical Code Recognition.
Serial Interface with FELP
The Serial Interface and Frontend Link Protocol (FELP) provide the communication
interface between the CO
2
frontend and the CO
2
application software module running on the
main CPU of the Measurement Server.