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Temperature Controllers
The FlarePro utilizes electronic controllers that regulate heating and
cooling (Figure 1-4). The inlet enclosure temperature, main (purged)
enclosure temperature, and Hi/Low main enclosure temperature limits all
require separate controllers.
These controllers are set at the factory for optimum performance and
should require no subsequent maintenance or adjustment.
Pressurized / Purge Control System
Hazardous Location Installation
The FlarePro mass spectrometer is designed to be installed in
hazardous locations. Suitable hazardous locations are:
•
Class I, Division 2, Groups A, B, C, D, Temperature Code T3
Purging and Pressurization
The FlarePro uses a "purging and pressurization" technique to enable
the use of the analyzer in hazardous locations.
•
Purging passes a number of volumes of pressurization gas through the
enclosure before electrical power may be applied. This 'purges' any
potentially flammable gas that may have accumulated in the main
enclosure and replaces it with clean, dry air or inert gas (e.g. nitrogen).
•
Pressurization maintains the interior of the enclosure at a pressure
higher than the surrounding atmosphere while electrical power is
applied. This prevents possibly hazardous gases or vapors from
entering the enclosure.
The FlarePro's pressurized / purge control system includes a dry contact
(2 conductors), which is wired to the on-board computer. This contact
closes once proper purge pressure is sensed and opens upon loss of
pressurization. NEC/CEC Class I, Division 2 standards do not require that
power be removed from the analyzer upon loss of pressurization.
However, this contact may be used to notify the end-user of pressurization
loss. There are several potential causes of pressurization loss:
•
Interruption/decrease in purge gas flow to the analyzer.
•
The main enclosure door is not fully closed.
•
The terminal box lid is loose.
•
A component which contributes to the sealing of the main enclosure has been
removed or improperly installed during service.
•
Damage to the analyzer.
Overview | 1-13
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Troubleshooting
