EE181-L Air Temperature and Relative Humidity Sensor

Accurate, rugged, ideal for long-term, unattended applications

The EE181 is a rugged, accurate air temperature and relative humidity (RH) probe that is ideal for long-term, unattended applications. It includes a proprietary coating on the RH element that increases the life of the element and protects it from dirt, dust, salt, or other contaminants. A 1000 Ω PRT measures air temperature for the -40° to +60°C range. For optimum results, the EE181 should be recalibrated annually. 

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Benefits and Features 

    • Well-suited for long-term, unattended applications 
    • Accurate, rugged, reliable 
    • Outstanding long-term stability 
    • Wide operating temperature range 
    • User cleanable 
    • Compact and easily interchangeable 
    • Low power consumption 
    • Compatible with most Campbell Scientific dataloggers 
Measurement Description Temperature, relative humidity
Signal Type/Output Analog voltage
Supply Voltage 7 to 30 Vdc (typically powered by the datalogger’s 12 V supply)
Average Current Consumption < 1.2 mA
Filter Description 30 μm pore size, stainless-steel mesh
Startup Time 2 s
Housing Body Material Plastic
Housing Classification IP65
Field Replaceable Chip or Recalibrate Recalibrate
Operating Temperature Range -40° to +60°C
Sensor Diameter 2.1 cm (0.83 in.)
Length 16.0 cm (6.3 in.)
Weight 290 g (10.2 oz) with 5 m cable
Air Temperature
Sensing Element 1000 Ω Platinum Resistance Thermometer (PRT)
Measurement Range -40° to +60°C
Storage Temperature Range -40° to +80°C
Output Signal Range 0 to 1 Vdc
Accuracy ±0.2°C (at +23°C)
Relative Humidity
Sensing Element Capacitance
Measurement Range 0 to 100% RH (non-condensing)
Output Signal Range 0 to 1 Vdc
Temperature Dependence Typically 0.03% RH/°C
Accuracy
  • -NOTE- Accuracy specifications include hysteresis, non-linearity, and repeatability.
  • ±(1.3 + 0.003 • RH reading) % RH (at -15° to +40°C, 0 to 90% RH)
  • ± 2.3% RH (at -15° to +40°C, 90 to 100% RH)
  • ± (1.4 + 0.01 • RH reading) % RH (at -25° to +60°C)
  • ± (1.5 + 0.015 • RH reading) % RH (at -40° to +60°C)

 

Brochures: EE181 Air Temperature and Relative Humidity Probe

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Manuals: EE181 Temperature and Relative Humidity Probe

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