Casella CEL Automatic weather station - Manual (Page 26)

Display Format ###.#
Polynomial 0, 0.2
Enabled Yes
Logged Yes
Minimum Limit 0.0
Maximum Limit 100.0
3.8 Soil Temperature Sensor
The soil temperature sensor is designed to be
installed at any depth, by digging a small
hole to the required depth, locating the
sensor then back filling.
The sensor may be used to
measure ground surface temperature by
installing in the top 1 cm of the soil sample.
3.8.1 Soil Temperature Sensor Specification
Part number: 120620B
Sensor type: Semi conductor current generator
Measuring range: -40°C to 60°C
Calibrated accuracy: ±0.5°C between -20 to + 50°C
Supply voltage: 7 to 15 V
Power consumption: Typically <1 mA
Output calibration: Nominally 1.5 V at 0°C and 1.8 V at 50°C
Units are individually calibrated and provided
with offset and multiplier values
Cable: 3 m cable supplied
3.8.2 Soil Temperature - Sensus Channel Configuration
Description Soil temperature
Units o C
Type Analog
Information Single ended
Gain x 1
No current source
Display Format +##.#
Polynomial Sensor specific
Enabled Yes
Logged Yes
Minimum Limit -40.0
Maximum Limit +60
3.9 Leaf Wetness Sensor
The leaf wetness sensor is a low power
electronic module in a waterproof probe,
where the active part of the probe consists of
three carbon electrodes. In effect, the sensor
is a digital device, being either ON or OFF
with virtually no graduation between the two
states. Free water on the sensing element
changes the conduction, switching the output from OFF to ON.
The device is not sensitive to changes in atmospheric humidity.
Optional Sensors
01061
Soil temperature sensor
01062
Leaf wetness sensor
Page 26 of 34
Automatic Weather Station
Assembly & Commissioning Handbook