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The MET4A
is a Fan-Aspirated Meteorological Measurement System that provides
high accuracy data from barometric pressure, temperature and
relative humidity sensors. Pressure resolution is better than 1
microbar with a total accuracy of better than ±0.08 hPa over the extended
barometric range of 500 to 1100 hPa. Temperature resolution is
0.01 degrees C with a total accuracy of better than ±0.2 degree C over the full
temperature range of –50 to +60 degrees C. Relative humidity
performance is better than ±2% at 25 degrees C and the recovery
time after 100% RH saturation is less than 20 seconds. Desirable characteristics
include durable weather proof packaging, no warm up time,
high reliability and long term stability. Optional configurations
include Barometric Functions (Altimeter Setting, Station pressure,
Field pressure, Sea level pressure, Density Altitude, Pressure
Altitude, QNH, QFE and WMO Pressure Tendency Codes) and/or Data
Logging. The measurement suite can be interfaced with Computer
Systems, GPS Receivers and External Loggers.
An internal Digiquartz® pressure
transducer, precision temperature/humidity probe and
microprocessor-based electronics provide the measurement and
communications capabilities Measurement data is accessed via RS232
or RS-485 serial ports. An external status panel monitors power
status and RS-232/RS485 communication.
The MET4A features
the DigiPort high-performance barometric pressure port. It is
designed to dramatically reduce barometric pressure measurement
errors in the presence of wind.
Air temperature and
humidity measurements are provided by a single probe. The probe is
fully calibrated and self contained, providing easy plug and play
interchangeability. The probe is readily accessed by the user for
field replacement.
The air
temperature/humidity probe is housed within a solar shield.
The purpose of the solar radiation shield is to minimize air
temperature measurement errors caused by exposure to direct
sunlight. The MET4A features a multi-chamber, fan-aspirated solar
shield for superior immunity to temperature measurement errors
caused by solar radiation.
The MET4A is
designed for easy and convenient mounting to masts, tubing and other
structures. Mounting hardware is included for easy system
integration
The Digiquartz®
barometer used in the MET4A has a 3-year stability warranty of
better that 0.1 hPa per year and includes a limited 5-year
warranty with the first 2-years covered at 100%. The System
includes a limited one-year warranty. The RH and Temperature probe
is field replaceable and barometer performance can be verified in
the field using the Paroscientific Model 765-16B Portable Pressure
Standard and DigiPort High Performance Pressure Port.
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