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Why
settle for incorrect or slow responding data during conditions of
high humidity, dense fog or calm winds? Fan aspirated shields can
eliminate errors and improve response time.
Fan Aspirated Radiation Shields
Performance of sensors when installed in natural aspirated shields
is affected By wind speed. Low wind speeds, or calm conditions, create
the most errors. During calm conditions, and also during fog or high
humidity, response time of the sensors is reduced. For these reasons
many sites which do have sufficient power available would have improved
data quality using fan aspirated shields. ESP has produced a series
of fan aspirated shields to accommodate various sites. The LPC use
DC operated fans and provide a continuous air flow over the sensors
at a minimum flow rate of 2m/s. These shields are recommended when
solar panel or battery power is used. Fans with 1 watt of power consumption
can be provided to minimize power drain, yet supply adequate air flow.
The HVAF series is primarily used at sites having commercial power.
The fans used provide a large volume of air over the sensors, at a
constant air flow. This improves the response, especially during rapidly
changing conditions.
LPC Aspirated Radiation Shields
• Low power consumption.
• Double wall construction
• Low thermal conductivity
• High reflectivity surface
• Low thermal retention
• Strong mechanical design
• Metal construction
• High RFI/EMI protection
HVAF Aspirated Radiation Shields
• High volume air flow (45cfm minimum) assures rapid exchange
of a during changing environmental conditions.
• Air speed over the sensors is 5-6m/s which also ensures rapid
response.
• Metal construction enables installation at sites where there
are high winds or heavy rains and ice storms.
• Metal construction reduces effects of RFI/EMI and lightning,
especially when installed at meteorological towers located at airports
and areas where thunderstorm activity is frequent.
• ESP shields can be used with a variety of probe diameters and
lengths.
• Standard fans have a projected operational cycle of 50,000
hours.
• Operating temperature of the fans is specified at -28C to 70C.
• Double wall construction and inlet baffle reduces the effects
of surface reflectivity and thermal hot-spots. |
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