Thermohygrometer with natural ventilation screen. RS485 output

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 Specification

MeasurementsTemperature 
Relative Humidity
OutputRS485
ProtocolModbus RTU®, TTY-ASCII
ConfigurationHyperterminal
RS485 protectionGalvanic insulation (3 kV, UL1577)
RS485 speed1200 ÷ 115 kbps
Power supply 10 ÷ 30 Vac/dc
Power consumption1 W
Electric protection Tranzorb and Emifilter
VentiationNatural
Resolution Temperature: 0.01 °C
Relative Humidity: 0.1% 
Code: DMA975
DMA875_FB_001

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