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Campbell Scientific - Model 109 -Temperature Probe
The 109 is a rugged, accurate probe that measures air, soil, and water temperature for a variety of applications. It consists of a thermistor encapsulated in an epoxy-filled aluminum housing. The housing protects the thermistor, allowing you to bury the 109 in soil or submerge it in water. The 109 measures from -50° to +70°C, and it outputs a 0 to 2.2 V signal when using 2500 mV excitation.
When exposed to sunlight, the 109 should be housed in a 41303-5A, 41303-5B, or RAD06 6-plate radiation shield. The louvered construction of these radiation shields allows air to pass freely through the shield, thereby keeping the sensor at or near ambient temperature. The shields’ white color reflects solar radiation
The RAD06 uses a double-louvered design that offers improved sensor protection from driving rain, snow, and insect intrusion, and it 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 41303-5A and RAD06 attach to a crossarm, mast, or user-supplied pipe with a 2.5 to 5.3 cm (1.0 in to 2.1 in) outer diameter.
The 41303-5B attaches to a CM500-series pole or a user-supplied pole with a 5.1 cm (2.4 in) outer diameter.
Water TemperatureThe sensor can be submerged to 15 m (50 ft) or 21 psi. The 109 is not weighted, and therefore the installer should either add a weighting system or secure the sensor to a fixed, submerged object, such as a piling.
Soil TemperatureThe 109 is suitable for shallow burial only. Placement of the sensor’s cable inside a rugged conduit may be advisable for long cable runs—especially in locations subject to digging, mowing, traffic, use of power tools, or lightning strikes.
- Versatile product—measures air, soil, or water temperature
- Wide temperature measurement range
- Compatible with most Campbell Scientific data loggers
- Easy to install or remove
- Durable
- Output: Analog
- Operating Temperature Range: -50° to +70°C
- Sensor Description: Measurement Specialties™ 10K3A1iA Thermistor
- Tolerance: ±0.2°C (over 0° to 70°C range)
- Temperature Measurement Range: -50° to +70°C
- Steinhart-Hart Equation Error: ≤ 0.03°C (-50° to +70°C)
- Interchangeability Error: ±0.1°C (over 0° to 70°C range increasing to ±0.5°C at -50°C)
- Time Constant in Air: 30 to 60 s (in a wind speed of 5 m s-1)
- Maximum Submergence: 15 m (50 ft)
- Maximum Cable Length: 305 m (1000 ft)
- Probe Length: 10.4 cm (4.1 in.)
- Probe Diameter: 0.76 cm (0.3 in.)
- Weight: 136 g (5 oz) with 3.05-m (10-ft) cable
Data Logger Considerations
The 109 was designed specifically for our CR200(X)-series and CR300-series dataloggers but is suitable for other compatible data loggers.
Programming
All compatible CRBasic data loggers contain the Therm109 instruction for measuring the 109 probe. Programming is more complicated for older Edlog data loggers because they must use generic measurement instructions.
Installation Considerations Air Temperature
When exposed to sunlight, the 109 should be housed in a 41303-5A, 41303-5B, or RAD06 6-plate radiation shield. The louvered construction of these radiation shields allows air to pass freely through the shield, thereby keeping the sensor at or near ambient temperature. The shields’ white color reflects solar radiation.
The RAD06 uses a double-louvered design that offers improved sensor protection from driving rain, snow, insect intrusion and has lower self-heating in bright sunlight combined with higher temperatures (> 24°C [~75°F]) and low wind speeds (< 2 m/s [~4.5 mph]), giving a better measurement.
The 41303-5A and RAD06 attach to a crossarm, mast, or user-supplied pipe with a 2.5 to 5.3 cm (1.0 in to 2.1 in.) outer diameter. The 41303-5B attaches to a CM500-series pole or a user-supplied pole with a 5.1 cm (2.4 in.) outer diameter.
Soil Temperature
The 109 is suitable for shallow burial only. Placement of the sensor’s cable inside a rugged conduit may be advisable for long cable runs—especially in locations subject to digging, mowing, traffic, use of power tools, or lightning strikes.
Water Temperature
The sensor can be submerged to 15 m (50 ft) or 21 psi. The 109 is not weighted; therefore, the installer should either add a weighting system or secure the sensor to a fixed, submerged object, such as a piling.