The MET4 and fan-aspirated MET4A Meteorological Measurement Systems provide 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. In the Nano-Resolution mode, the MET4 and MET4A has a resolution of one-part-per billion providing the ability to detect natural atmospheric signals such as Micro-Baroms and other atmospheric noise. Temperature resolution is better than 0.01 degrees C.
These fully-integrated systems are housed in environmental enclosures allowing indoor or outdoor mounting. Installation hardware and software are included and optional interface cabling is available. The MET4 solar radiation shield protects the temperature and humidity sensors from precipitation and solar radiation. Both the MET4 and fan-aspirated MET4A utilize a high performance pressure port to reduce dynamic pressure errors caused by wind.
Microprocessor-based electronics provide fully temperature compensated and linearized outputs via a bi-directional RS-232/485 interface. This serial interface allows complete remote configuration and control of all operating parameters including resolution, sample rates, choice of engineering units, integration time, and sampling commands. The airport barometric functions include field pressure, station pressure, altimeter setting, sea-level pressure, density altitude, pressure altitude, Q Codes - QNH & QFE and WMO pressure tendency codes. The internal data logger can store over 200,000 high resolution data points.
The Digiquartz® barometer used in the MET4 and MET4A has a 3-year stability warranty of better than 0.1 hPa per year. 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.
STANDARD FEATURES:
- Data Logging
- Airport Barometric Functions
- Simple Plug & Play Installation
- Integral Environmental Enclosure
- Instrument Status LED Indicators
- RS-232/485 Bi-Directional Interface
- Nano-Resolution Providing One-Part-Per Billion Resolution
QUALITY AND STANDARDS:
- CE Compliant
- NIST Traceable
- ISO 9001:2008 Quality System
APPLICATION AREAS:
- GPS Meteorology (Precipitable Water Vapor)
- Crustal Observation - Tectonic Research
- Weather and Climate Research Studies
- Surface and Maritime Weather Observation
- Ground Based Altimeter Setting Indicators
PRESSURE CHARACTERISTICS
Accuracy (1.) ........... Better than ±0.08 hPa
Stability ........... Better than 0.1 hPa per year
Range ........... 500 ... 1100 hPa (7 ... 16 psia)
Maximum Pressure ........... 1240 hPa (18 psia)
TEMPERATURE CHARACTERISTICS
Performance:
MET4: ........... Better than ±0.5 °C
MET4A (Fan-Aspirated): ........... Better than ±0.1 °C
Resolution ........... 0.01 °C
Range ........... -40 °C to +60 °C (-40 °F to +140 °F)
HUMIDITY CHARACTERISTICS
Performance ........... Better than ±0.8% RH at 23°C
Range ........... 0 to 100% non-condensing
Recovery Time ........... ≤20 seconds (MET4A)
ENVIRONMENTAL
Weight:
MET4: ........... 7.3 lb (3.31 kg)
MET4A: ........... 9.4 lb (4.26 kg)
Calibrated Temperature Range ........... -50 °C to +60 °C
Power Requirements
MET4: ........... Operates from 5 to 16 VDC
MET4A: ........... Operates from 11 to 14 VDC
Typical Current Consumption MET4:
Standard Resolution (Parts per million) .......... 40 mA MAX
Nano-Resolution (Parts per billion) ........... 70 mA MAX
Typical Current Consumption MET4A:
Standard Resolution (Parts per million) .......... 230 mA MAX
Nano-Resolution (Parts per billion) ........... 260 mA MAX
ACCESSORIES
- Setup and Configuration Software (included)
- AC adapter and interface cables (optional, P/N 2637-0XX)
- Model 715 Display (optional, P/N 1554-00X)
- Field Replacement Kits (optional):
-MET4/4A RH & Temperature Probe Replacement Kit P/N 1777-002
-MET4A Fan Replacement Kit P/N 1776-001
Notes
- Accuracy relative to the primary standard includes pressure hysteresis, repeatability, linearity and temperature conformance.
