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VH400 Soil Moisture Sensor Probe Specifications Power consumption: < 13mA Supply Voltage: 3.5V to 20 VDC. Dimensions See drawing. Power on to Output stable: 400 ms Output Impedance: 10K ohms Operational Temperature: -40ºC to 85ºC Accuracy at 25°C: 2% Output: 0 to 3V related to moisture content Shell Color: Red Voltage Output Curves: Curves, Piecewise...
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UA-002-64 HOBO Pendant Temperature/Light 64K Data Logger

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A miniature, value-priced, waterproof data logger for temperature and light monitoring applications; stores 52K measurements.  IMPORTANT INFORMATION Requires HOBOware software and either an Optic USB Base Station or a HOBO Waterproof Shuttle (U-DTW-1). HOBOware Pro is required when using the HOBO Waterproof Shuttle. See compatible items below.
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STP01 Soil Temperature Sensor
  • STP01 Soil Temperature Sensor
  • STP01 Soil Temperature Sensor

STP01 Soil Temperature Sensor

STP01

STP01 Soil Temperature Sensor

STP01 accurately measures the temperature profile of the soil at 5 depths close to its surface. It is used for scientific grade surface energy balance measurements. The sensor is buried and usually cannot be taken to the laboratory for calibration. The on-line self-test using the incorporated heating wire offers a solution to verify STP01’s measurement stability.

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Description

Measurand temperature at 5 depths from 0 to 0.5 m
Measurement range 30 to +70 °C
Temperature sensors matched thermocouples type T
Uncertainty of temperature difference measurement 1.5 % of measured value plus measurement system uncertainty in x 10⁻⁶ V/40
Uncertainty of relative position ± 0.001 m
Rated operating environment surrounded by soil
On-line functionality testing self-test using the incorporated heater
Reference temperature sensor Pt100, IEC 751:1983 class B
Sensor foil thickness 0.6 x 10⁻³ m, 2.5 x 10⁻³ m at Pt100
Measurement depths 0.02, 0.05, 0.1, 0.2 and 0.5 m
Standard cable length (2 cables) 5 m (see options)
IP protection class IP67
Optional non-traceable measurand thermal conductivity at 3 depths
Heater specifications :
Heater rated power supply 9 to 15 VDC
Power consumption daily average 0.005 W
Interval between self-tests 24 h
Self-test duration 600 s
Order code STP01/cable length in m

Options

  • Longer cable (2 x), in multiples of 5 m, cable lengths longer than 20 m in multiples of 10 m
  • IT01 insertion tool

Improved accuracy & quality assurance
STP01 soil temperature profile sensor offers an accurate temperature difference measurement at five measurement locations at 0.02, 0.05, 0.1, 0.2 and 0.5 m below the soil surface. It also has a well specified and fixed distance between the measurement locations. STP01 contains 5 matched thermocouples, at locations A to E in figure 5, and one reference temperature sensor (Pt100 type) at location E at 0.5 m depth. By having the reference temperature measurement in the sensor and only measuring differential thermocouple voltages (relative to the reference  at 0.5 m), the uncertainty of the  temperature difference measurement is very low: ± 0.02 °C is attainable. Simple copper-conductor signal wire is used in STP01’s cable. As an extra, a heating wire is incorporated in STP01. Analysis of the temperature change during the heating interval serves as a self-test. Soil temperature sensors are preferably left in the soil for as long as possible, so that the soil properties become representative of natural conditions. Using self-testing, the user no longer needs to take sensors to the laboratory to verify their stable performance. The result is a much improved accuracy & quality assurance of the measurement relative to measurements with conventional sensor types.

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STP01
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