Ideal for long-term, unattended applications
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
- Wide operating temperature range
- User cleanable
- 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 |
|
Compatibility
Note: The following shows notable compatibility information. It is not a comprehensive list of all compatible or incompatible products.
Data Loggers
| Product | Compatible | Note |
|---|---|---|
| CR1000 (retired) | ||
| CR1000X | ||
| CR300 | ||
| CR3000 (retired) | ||
| CR310 | ||
| CR350 | ||
| CR6 | ||
| CR800 (retired) | ||
| CR850 (retired) |
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.
Documents
Case Studies
The Utah Geological Survey, supported by the Utah Division of Water Rights, has constructed a......read more
As part of the United Nations Development Programme's (UNDP) Crisis Prevention and Resilience Building component,......read more
Articles and Press Releases
Blog Articles
-
The Most Rugged Air Temp/RH Sensor We Know of: the EE181
14-12-2016 Author: Robin Deissinger
Newsletter Articles
Privacy Policy Update
We've updated our privacy policy. Learn More
Cookie Consent
Update your cookie preferences. Update Cookie Preferences