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Hydrological Sensors


ITEM MAKE MODEL TYPE MAIN FEATURES CABLE
 Delta-T (ML-2X)  Theta Probe (ADR)  -Accuracy: ±1%
 -Easy Datalogger connection (DC in/out)
 -Excellent temperature and salinity stability
 -Dual purpose

 5m Cable (Max 100m)
 Delta-T (ST-2)  Thermistor Probe  -Range: - 40℃ to + 55℃
 -Accuracy: ±0.1℃
 -Logger input type: 3WR
 5m Cable (Max 100m)
 Davis (6420)  Artificial leaf electric resistance  -Resolution: 1
 -Range: 0 ~ 15
 -Accuracy: ±0.5
 5m Cable (Max 100m)
 Delta-T (MT-2)  Thermistor  - Accuracy: ±0.1℃ at 0-70℃ ±0.2℃ at -40℃
 - Resistance: 20,000hm at 25℃
 - Stability: ±0.2℃ in 8 years at 25℃
 12m Cable (Max 61m)



Comparison with Theta Probe and TDR
TDR THETAPROBE (ADR)
  - Time Domain Reflectometry  - Amplitude Domain Reflectometry
  - The soil bulk dielectric constant is determined by measuring   the time for an electromagnetic pulse to propagate along a   transmission line  - Electromagnetic wave travelling along a transmission line reaches a   section with different impedance, part of the energy is reflected back into   the transmitter
 Accuracy (±0.01 ft3 ft-3)
 Easily expanded by multiplexing
 Wide variety of probe configurations
 Minimal soil disturbance
 Relatively insensitive to normal salinity levels
 Accurate with Soil-specific calibration (±0.01 ft3 ft-3)
 Measurement in highly saline conditions
 Minimal Soil disturbance
 Inexpensive due to standard circuitry
 Not affected by temperature
  - Expensive due to complex elctronics
 - Limited applicability under highly saline conditions
 - Soil-specific calibration required for soils having large amounts  of water
 - Small sensing volume
 - Soil-specific Calibration recommended for reliable measurements
 - Measurement affected by air gaps, stones, channeling water
 - Small sensing volume (0.27 in3)


Features & Specification
• Range: Accuracy figures apply over the range 0.05 to 0.6 m3. m-3, Full reading range is 0 to 1 m3.m-3
• Sensor Type: Theta Probe
• Units: Units are convertable
• Accuracy: ±0.01 m3. m-3: 0 to 40℃, ±0.02 m3. m-3: 40 to 70℃, ±0.05 m3. m-3: 0 to 70℃
• Resolution: 10 centibar suction
• Depths: Ground level + Five under-level
• DELTA-T DEVICES Manufactured
• Stable, trouble free saline operation
• Robust, Buriable, Maintenance free
• Optical Extension tubes for easy placement and removal while burying


Features & Specification
• Range: -40℃ to +55℃
• Accuracy: ±0.1℃
• Resolution: ±0.01℃
• Sensor Type: Resistance Type
• Response Time: 8 seconds
• Depths: Two (5 cm and 20 cm)
• DELTA-T DEVICES Manufactured
• Precision thermistor probe
• Water Resistant, Stainless steel sheath
• Suitable for burial as soil temperature probe
• Probe length/Diameter- 125/ 4.8mm


Features & Specification
• Range: -50℃ to +150℃
• Accuracy: ±0.1℃ at 0-70℃ ±0.2℃ at 40℃ ±0.15℃ at 100℃
• Resolution: ±0.01℃
• DELTA-T DEVICES Manufactured
• Coated with a vinyl dip (Electrically insulting coating)
• Thermistor Resistance: 2000 ohm at 25℃
• Size: 2.4 mm square (max)


Features & Specification
• Operating temperature: -10℃ to +60℃, Non-frosting
• Accuracy: ±0.5
• Unit: Dry/wet and duration, user selectable
• Time constant: 2 sec Update interval: 62.5 ~ 75sec user selectable
• Sensor Type: Artificial leaf electrical resistance, Dielectric
• Davis Manufactured, Off-the-shelf available
• Detects presence of surface moisture
• Consists of gold-plated etched circuit on an epoxy-glass substrate sensing grid
• Displays results for the entire grid
• Simulates typical leaf position and permits runoff of excess moisture

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