Figure 1-2: Analyzer assembly with TCD bridge
A. Detector block (in heated oven section of analyzer)
B. Reference flow (carrier gas)
C. Measurement flow ("MV")
D. Signal out
E. Preamplifier (in analyzer electronics housing)
F. Detector bridge
G. DC power
H. Valves, columns, etc.
In the quiescent condition, prior to injecting a sample, both legs of the bridge are exposed
to pure carrier gas. In this condition, the bridge is balanced, and the bridge output is
electrically nulled.
The analysis begins when the sample valve injects a fixed volume of sample into the
column. The continuous flow of carrier gas moves the sample through the column. As
successive components elute from the column, the temperature of the measurement
element changes.
The temperature change unbalances the bridge and produces an electrical output
proportional to the component concentration.
The differential signal developed between the two thermistors is amplified by the
preamplifier.
illustrates the change in detector electrical output during elution
of a component.
Reference Manual
Overview
2-3-9000-744
June 2022
Rosemount 700XA
15
Содержание Rosemount 700XA
Страница 1: ...Reference Manual 2 3 9000 744 Rev L June 2022 Rosemount 700XA Gas Chromatograph ...
Страница 6: ...TxD TD or Sout Transmit data or signal out 6 ...
Страница 30: ...Overview Reference Manual June 2022 2 3 9000 744 30 Emerson com Rosemount ...
Страница 100: ...Installation and start up Reference Manual June 2022 2 3 9000 744 100 Emerson com Rosemount ...
Страница 117: ...Figure 5 10 LSIV exploded view Reference Manual Operation and maintenance 2 3 9000 744 June 2022 Rosemount 700XA 117 ...
Страница 182: ...Operation and maintenance Reference Manual June 2022 2 3 9000 744 182 Emerson com Rosemount ...
Страница 223: ...Figure A 19 Chromatogram menu Reference Manual Local operator interface LOI 2 3 9000 744 June 2022 Rosemount 700XA 223 ...
Страница 262: ...Local operator interface LOI Reference Manual June 2022 2 3 9000 744 262 Emerson com Rosemount ...
Страница 270: ...Micro flame photometric detector µFPD Reference Manual June 2022 2 3 9000 744 270 Emerson com Rosemount ...
Страница 278: ...Pre defined Modbus map files Reference Manual June 2022 2 3 9000 744 278 Emerson com Rosemount ...
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