EE181 Air Temperature and Relative Humidity Probe
Accurate, Rugged
Ideal for long-term, unattended applications
weather applications supported water applications supported energy applications supported gas flux and turbulence applications supported infrastructure applications supported soil applications supported

Overview

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.

Benefits and Features

  • Well-suited for long-term, unattended applications
  • Accurate, rugged, reliable
  • Outstanding long-term stability
  • User cleanable
  • Wide operating temperature range
  • Compact and easily interchangeable
  • Low power consumption
  • Compatible with most Campbell Scientific dataloggers

Images


Specifications

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)

Compatibility

Please note: The following shows notable compatibility information. It is not a comprehensive list of all compatible products.

Dataloggers

Product Compatible Note
CR1000 (retired)
CR1000 (retired)
CR1000 (retired)
CR1000X
CR300
CR3000
CR310
CR350
CR6
CR800
CR850

Additional Compatibility Information

Sensor Mounts

When exposed to sunlight, the EE181 must be housed in a 10-plate solar radiation shield. Campbell Scientific recommends the MetSpec RAD10E, which uses a double-louvered design that offers improved sensor protection from driving rain, snow, and insect intrusion. This shield also has lower self-heating in bright sunlight combined with higher temperatures (> 24°C [~75°F]) and low wind speeds (< 2 m s-1 [~4.5 mph]), giving a better measurement.

The EE181 will work with R. M. Young 10-plate radiation shields (41003-5 or 41003-5A), but these shields require a special adapter (pn 28415) to accommodate the sensor girth.

The RAD10E and 41003-5 attach to a crossarm, mast, or user-supplied pipe with a 2.5 to 5.3 cm (1.0 to 2.1 in.) outer diameter. The 41003-5A radiation shield attaches to a CM500-series pole or a user-supplied pole with a 5.1 cm (2.4 in.) outer diameter.

Case Studies


This Product Replaced