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Vegetronix Soil Temperature Sensor Probes
The THERM200 is a soil temperature probe, which has a temperature span from -40°C to 85°C. It outputs a voltage linearly proportional to the temperature, so no complex equations are required, to calculate the temperature from voltage. It is highly accurate with 0.125°C of resolution.
The sensor has a simple 3 wire interface: ground, power, and output, and is powered from 3.6V to 20VDC, and outputs a voltage 0 to 3V. Where 0 represents -40°C and 3V represents 85°.
The probes can be buried, or inserted into pots. Since the blade is so narrow, it can easily be inserted into potted plants.
The temperature sensor can be used with our soil moisture sensors, and together they can be used to detect the presence of ice.
The THERM200 is compatible with our data Loggers, or any other third-party data logger.
Thermistor based temperature sensors, are typically inaccurate, and use the complex Steinhart-Hart equation which contains complex calculations such as logarithmic and third order terms, which are difficult for microcontrollers to compute.
Once you've tried the THERM200, you'll never want to use a thermistor based sensor again.
Contact us for pricing information.
|THERM200-2M||Soil Temperature Sensor Probe - 2 meter Cable||$33.95|
|THERM200-5M||Soil Temperature Sensor Probe - 5 meter Cable||$40.95|
|THERM200-10M||Soil Temperature Sensor Probe - 10 meter Cable||$50.95|
THERM200 Temperature Sensor Probe
|Power consumption||< 3mA|
|Supply Voltage||3.6V to 20 VDC.|
|Dimensions||See drawing below.|
|Power on to Output stable||2 seconds|
|Output Impedance||10K ohms|
|Operational Temperature||-40ºC to 85ºC|
|Output Voltage Range||0V to 3V linear to temperature|
|Voltage Output Equation|| Temperature (ºC) = Vout*41.67 -40
Temperature (ºF) = Vout*75.006 -40
|Cable Length||2 meters|
|Red||POWER: 3.6V to 20 VDC.|
|Black||OUT: 0 to 3 linear to temperature|
THERM200 Soil Temperature Sensor Drawing
|1.||Where is the temperature sensing element on the probe?|
|The temperature sensor is inside of the blue enclosure.|
|2.||Do I need to bury the probe to measure soil temperature, or can I just insert the blade?|
|You need to bury the probe to measure soil temperature, otherwise, if you merely insert the blade, you will be measuring air temperature, not the soil temperature.|
|3.||Can the sensor read rapid fluctuations in temperature?|
| No. The probe is intended for measuring soil
temperature, and typically ground soil does not change temperature
rapidly. Likewise the temperature sensor has a high thermal
mass because of its waterproof enclosure, and so it make take 15
minutes or more to settle after a rapid external temperature change.
This does not mean that you need to power the sensor for 15 minutes before taking a reading. It means that it takes some time for the center of the probe to reach the same temperature as the soil in which it has placed.
The best way to get started is to order a few sample soil temperature sensor probes and try them out in your application. Please use our online ordering system to purchase units.