EXPO MiniPurge D770/ET, Руководство пользователя

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ML564 | v3
Expo Technologies UK
T: +44 (0) 20 8398 8011
E: sales@expoworldwide.com
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Expo Technologies China
T: +86 532 8906 9858
E: qingdao@expoworldwide.com
matic Vortex Cooler and two capillary thermostats; the Vortex Cooler Activation Thermostat and the
Logic Isolation Thermostat. These two thermostats are connected to the Pneumatic Vortex Cooler in a parallel
configuration and work independently to each other. The Vortex Cooling assembly uses a vortex tube to split the
compressed air supply allow the cold stream to ventilate the MiniPurge
®
housing to lower the ambient tempera-
ture for the sensitive logic components and exhaust the hot stream directly outside of the housing. Warning! The
hot exhaust protruding through the MiniPurge
®
housing can reach surface temperatures of +55°C above ambient
temperature; caution should be used when placing sensitive components near the exhaust or physical handling
during cooling operation.
Vortex Cooler Activation Thermostat
A capillary tube thermostat with pneumatic signal output that is used to activate the Pneumatic Vortex Cooler
when the enclosure’s internal temperature exceeds a pre-determined set point of 50°C. The temperature set
point is slightly lower than the Logic Isolation Thermostat to prevent constant isolation at 60°C.
Logic Isolation Thermostat
A capillary tube thermostat with pneumatic signal output that will isolate the logic supply when the ambient tem-
perature inside of the MiniPurge
®
housing reaches above the pre-set value that has been set in accordance to
ATEX and IECEx certification. The Logic Isolation Thermostat will cut the supply to the logic circuit to protect the
operation of the sensitive logic components under high ambient temperatures and will maintain the supply isola-
tion until the temperature within the has dropped below the falling switch point of the thermostat.