Emerson Rosemount Xstream Series - Technical Implementation; Fig. 3-10 A: TC Cell, Exterior View; Fig. 3-10 B: TC Cell, Sectional View

X-STREAM
3-15
Instruction Manual
HASAxE-IM-HS
05/2006
Emerson Process Management GmbH & Co. OHG
3 Principles
3-3-2 Technical Implementation
A block made either of aluminum, stainless
steel or hastelloy contains two gas paths. Both,
the volume of the block and the mass of the
sensors have been minimized in order to
obtain short response times. To suppress
Fig. 3-10a: TC cell, exterior view ,
thermal isolation removed
1 Sensor
2 Sample gas inlet and output
3 Reference side inlet and output
4 Metal block
5 Heater for thermostatting
1
2
3
45
Fig. 3-10b: TC cell,
sectional view
1 Internnal gas path
2 Sample gas inlet and output
3 PT 100 sensors
4 Metal block
5 Lid
1 3 4 52
influences by changing ambient temperature
the block is thermostatted and isolated against
ambience.
The sensors are fully glass packaged to
withstand aggressive gases.
3-3 Thermal Conductivity Measurement