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System Description
Bandpass Filter
Photomultiplier
Photodetector
Flow Sensor
Transducer
Vacuum Pump
Software
Instrument Control
8-4
Model 43i Trace Level-Enhanced Instruction Manual
The bandpass filter restricts the light reaching the photomultiplier tube to
the SO
The PMT converts optical energy from the reaction to an electrical signal.
This signal is sent to the input board which transmits it to the processor.
Tube
The photodetector is located in the fluorescence chamber and continuously
monitors the pulsating UV flash lamp. This photodetector is connected to
a circuit that automatically compensates for fluctuations in flash lamp
output.
The flow sensor is used for measuring the flow of sample gas in the
measurement system.
Pressure
The pressure transducer or pressure sensor measures the reaction chamber
pressure.
Capillary
The capillary along with the pump is used to control flow in the sample
line.
The vacuum pump draws the reacted gases out of the reaction chamber.
The processor software tasks are organized into four areas:
Instrument Control
●
Monitoring Signals
●
Measurement Calculations
●
Output Communication
●
Low-level embedded processors are used to control the various functions on
the boards, such as analog and digital I/O, and heater control. These
processors are controlled over a serial interface with a single high-level
fluorescence wavelengths.
2
Thermo Fisher Scientific
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Troubleshooting
