Thermo-Hygro-Barometer. Serial output, natural ventilation

Precise and reliable, this sensor is suitable for continuous meteorological measurements also in severe environments and in presence of steep thermal and hygrometric variations.
For outdoor application it should be coupled with a radiant screen. 

Instruments for accurate measurement of air temperature and relative humidity in severe outdoor environments. 

Highlights

  • 4 ÷ 20 mA, RS485-Modbus RTU, Radio output versions;
  • Forced ventilation radiant screen available;
  • Replaceable sensitive element;
  • Programmable air temperature measurement range.

Common Technical Specifications


 Temperature PrinciplePt100 1/3 DIN B (Class AA EN 60751)
 Measurement range

Programmable: -40 ÷ 60 °C; -50 ÷ 60 °C; -50 ÷ 70 °C; -30 ÷ 100 °C

 Accuracy0,1°C (@ 0°C)
 Output Pt100 DIN-IEC 751 table (EN 60751) 
 Response time (T90 air)Typical 4 s (@1 m/s air flow)
 Long term stability < 0.1 °C/year 
 Relative HumidityPrincipleCapacitive
 Measurement range0 ÷ 100%
 Accurancy±1% (@5 ÷ 95%)
 Output Programmable: Relative Humidity % or Dew Point 
 Response time (T90)Typical 10 s (@ 1 m/s air flow)
 Long term stability < ± 1% / year
 Hysteresis < 1% 
 General Information ProtectionIP66
 Operative temperature-40 ÷ 80°C

Technical specifications


MeasurementsTemperature
Relative Humidity
Pressure
OutputRS485
ProtocolModbus RTU®, TTY-ASCII
ConfigurationHyperterminal
RS485 protectionGalvanic insulation (3 kV, UL1577)
RS485 speed1200 ÷ 115 kbps
hPa measurement range800 ÷ 1100 hPa
hPa accuracy0.5 hPa
hPa thermal drift-0.025 hPa/°C
Power supply 10 ÷ 30 Vac/Vdc
Power consumption1 W
Electric protections Tranzorb and Emifilter 
VentilationNatural
Resolution Temperature: 0.01 °C
Relative Humidity: 0.1% 
Code: DMA980
DMA875_FB_001

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