EE181
EE181
OrderableAir Temperature and Relative Humidity Sensor
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.
This featured product was part of the Aconcagua expedition to install a weather station on South America’s tallest peak. Learn more about the expedition on our Extreme Application Series: Aconcagua page.
Key Advantages
Ideal for long-term, unattended applications
Benefits
- 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
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)
Common Accessories
(3)EE181CBL
Cable for the EE181
The EE181CBL is a cable for the EE181 Temperature and Relative Humidity Probe. One end of the cable is fitted with a connector for sensor attachment. The connector has a 316L marine-grade stainless-steel knurl to resist corrosion in coastal and other harsh environments. The other end of the cable either terminates in stripped and tinned leads or is fitted with a connector for our prewired enclosures.
OrderableRAD10E
10-Plate Solar Radiation Shield for Larger Sensors
When exposed to sunlight, the EE181 must be housed in a radiation shield. One RAD10E is needed per EE181. The RAD10E is attached to a Campbell Scientific crossarm or mast. The RAD10E uses a double-louvered design that offers improved sensor protection from driving rain, snow, and insect intrusion.
Orderable39123
DIN Rail Terminal Kit with 2 Terminals and 5 Wires
The 39123 provides the needed DIN rail terminals, separator, and wires to connect any product to a data logger or other peripheral that requires five wires for connection. This kit provides the following wires: black, light blue, red, yellow, and clear. The color-coding of these wires matches the wire coloring of the product for ease in connection, maintenance, and troubleshooting.
Orderable
Other Accessories
(2)41003-5
10-Plate Solar Radiation Shield
The 41003-5 is a naturally aspirated 10-plate radiation shield. Its louvered construction allows air to pass freely through the shield, keeping the probe at or near ambient temperature.
Orderable15823
Hex Plug for HMP45C or EE181
The 15823 is a compression fitting that is used to mount an EE181 or an HMP45C Temperature and Relative Humidity Probe in a 41003-5 10-Plate Solar Radiation Shield.
Orderable
Ships With
(1)- NIST Traceable Calibration Sheet
Compatibility
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.
Related Resources
Case Studies
Rwanda: Weather Station Upgrades with GBON-Compliant Instrumentation
Improving observational data to benefit global numerical weather prediction systems
Rwanda, Africa
June 18, 2025
View
Union of the Comoros: Establishment of Four Weather Stations for Better Resilience to Climatic Hazards
Monitoring an area prone to seasonal cyclones
The Union of the Comoros, East Africa
January 14, 2022
View
Utah: Flux Stations
Improving ground-truth measurement of water throughout the state
Utah, USA
June 9, 2023
View
Documents
- Manual
EE181 Temperature and Relative Humidity Probe
January 2025
View Document - Brochure
EE181 Air Temperature and Relative Humidity Probe
March 2026
View Document Campbell Scientific offers new EE181 temperature and humidity probe
View Document- Compliance
EE181 RoHS Declaration of Conformity
January 2021
View Document
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