E8500 Instruction & Operations Manual
version 1.010
Page 23 of 45
B. Stack temperature sensor
The thermocouple is located at the tip of the probe. It measures the stack
temperature minus the ambient temperature. The thermocouple junction is a
shielded, ungrounded, inconel sheathed, type K thermocouple with a capability
of measuring temperatures from 0 to 2000 ºF. The instrument software
linearizes the thermocouple output to improve the accuracy.
C. Draft sensor / Gas velocity sensor.
If the analyzer comes with the stack gas velocity option (separate S-type pitot
tube and tubing), the pressure sensor, located inside the drawer compartment,
is a very low range (0-10” WC) pressure sensor.
If the analyzer does not have the gas velocity option, then the pressure sensor
is a 0-1 PSI, higher range sensor for the measurement of stack draft.
Pressure / velocity will zero every time an autozero countdown is carried out.
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