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SERVOPRO CHROMA Gas Analyser
12
04400001A / Revision 7
1.3.4
Thermal Conductivity Detector (TCD)
The Thermal Conductivity Detector (TCD)
i
s a universal technique suitable to
determine mixture of gases at percentage levels. The TCD compares the thermal
conductivity of two gas flows
–
the pure carrier (reference) gas and the impurity
eluting from the GC column. Changes in the temperature of the electrically-
heated wires in the detector are affected by the thermal conductivity of the gas
which flows around this. The changes in this thermal conductivity are sensed as
a change in electrical resistance and are measured. The sensitivity is close
related to the nature of the impurity and the selection of the carrier gas.
1.3.5
Signal conditioning
The signal conditioning module offers very high gain with minimum drift and
noise. A special design low noise high stability analogue power supply is used.
The signal conditioning board can accept signals from up to 7 detectors. The
various signals can be monitored from the diagnostic menu. The signal
conditioning module has its own microcontroller to communicate with the main
PC.
1.3.6
Main PC and graphic display
The main PC board manages all User Interface I/O and sends the information to
the I/O board and the Signal Conditioning board via RS-485. The keypad and
colour graphic display are directly connected to it.
1.3.7
Oven heater and control
Up to 6 ovens can be fitted into the main chassis. The temperature electronic
control hardware is mounted on the I/O board. There are 6 temperature control
loops (PID) in the software. The temperature is measured with a RTD. The
analogue to digital resolution uses 24 bit A/D converters. The heater is controlled
in a Pulse with Modulation (PWM) scheme.
There are 8 electronic relays mounted on the I/O board. These relays turn ON at
zero crossing voltage and turn OFF at zero crossing current thus eliminating EMI.
Oven circuits are also protected by a fuse mounted on the I/O board.
Содержание SERVOPRO Chroma
Страница 1: ...Part Number 04400001A Revision 7 Language UK English SERVOPRO Chroma OPERATOR MANUAL ...
Страница 2: ...SERVOPRO CHROMA Gas Analyser 1 04400001A Revision 7 ...
Страница 73: ...SERVOPRO CHROMA Gas Analyser 72 04400001A Revision 7 DO NOT CHANGE THESE SETTINGS they are factory configured ...