The Temperature Probe 109 consists of a thermistor encapsulated in an epoxy-filled aluminium housing. The housing protects the thermistor, allowing the 109 to be buried or submerged. The 109 measures from -50° to +70°C.
When exposed to sunlight, the 109 should be housed in a 41303-5A, 41303-5B, or RAD06 6-plate radiation shield. The louvred 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 colour 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 into 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.
The 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.
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.
Benefits and Features
Versatile product—measures air, soil, or water temperature
Wide temperature measurement range
Compatible with most Campbell Scientific data loggers
Easy to install or remove
Compatible with the CWS900-series interfaces, allowing it to be used in a wireless sensor network
Steinhart-Hart Linearization 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)
Weight: 136 g (5 oz) with 3.05-m (10-ft) cable
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