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Emerson Process Management GmbH & Co. OHG4-14
X-STREAM XEFD
Instruction Manual
HASXEDE-IM-EX
03/2012
4.3 Vapor Recovery Application - Special Information
4.3.3 Failure Situation
Separated from the converter assembly an
independent over temperature protection de-
vice is installed. This device is setup to take
control of the jacket heaters if the measured
temperature inside the jacket exceeds about
310 °C ( 590 °F), e. g. due to a failure with
the temperature control board.
The overtemperature device is self-resetting,
so the heaters are not continuously discon-
nected from power, but only as long as the
measured temperature is above the limit. If
the temperature goes below this limit, the
jacket heaters again are powered. This beha-
viour results in a failure operating temperature
of 300 to 315 °C ( 572 to 600 °F).
Also, the overtemperature protection device
is connect to a X-STREAM digital input. This
digital input is setup to provide a failure signal
if the overtemperature protection device has
taken control of the jacket heaters.
If a failure status is active, check
the jacket heaters temperature
control. Continuously opera-
ting the converter material at
a temperature above 280 °C
(536 °F) affects the concentra-
tion measurement accuracy!
EXPLOSION HAZARD BY HOT COMPONENTS
Consider the waiting time statement on the front door label, if opening the
analyzer is required!
Do not open instrument when energized.
Ensure that external circuitry is disconnected or de-energized before
opening the instrument.
1: Overtemperature
protection device
1
Fig. 4-12: Location of Overtemperature Protection Device
The waiting time is calculated
to ensure, temperatures of
hot
components are below the ana-
lyzer temperature class for hazar-
dous areas!
Accessible components still may
be hot and harmful to humans!