Specifications

Specifications subject to change without notice.

General

General specifications apply to both the LI-300 and LI-350.

Volume of Influence: 1400 mL

Response Time in Water: < 20 seconds to 90%

Sensor Drift: < 0.01 °C per year

Weight (excluding cable): ~77 g (2.72 oz.)

Volumetric water content

Range: 0.0 to 1.0 m³ m⁻³

Resolution: 0.001 m³ m⁻³

Accuracy1 For factory calibration soils.:

±0.03 m³ m⁻³ typical

±0.06 m³ m⁻³ maximum

Dielectric permittivity2 Specifications exclude errors from the Topp (1980) approximation.

Range: 1 (air) to 80 (water) dielectric permittivity units

Resolution: 0.002 dielectric permittivity units

Accuracy: ±1.0 dielectric permittivity units

Temperature

Range: −40 to 70 °C

Resolution: 0.1 °C

Accuracy:

±0.5 °C from −40 to −20 °C

±0.3 °C from −20 to 70 °C

Electrical conductivity (bulk)

Range: 0 to 20000 µS cm⁻¹

Resolution: 1 µS cm⁻¹

Accuracy:

±5 % from 0 to 10000 µS cm⁻¹

±8 % from 10000 to 20000 µS cm⁻¹

LI-300 specifications

Power Requirements:

Input Voltage Range: 3.053 Does not include margin for cable voltage drop and power supply voltage dips. to 15 VDC

Average Idle Current Consumption (typical): 1.3 mA

Average Active Current Consumption: < 10 mA for < 12 ms

Power On Current Peak: 160 mA for 200 µs

Warmup Time (power on to valid DAC output): < 25.0 ms

Output Signals: Analog Voltage

VWC (Soil Moisture) Range: 0.5 to 2.5 V

Temperature Range: 0.0 to 2.5 V

LI-350 specifications

Power Requirements:

Input Voltage Range: 4.04 Can operate down to 3.05 V but the voltage levels of the SDI-12 bus will no longer be SDI-12 compliant. to 15 VDC

Average Idle Current Consumption (typical): 500 µA

Average Active Current Consumption: < 10 mA for < 12 ms

Power On Inrush Current Peak: 160 mA for 10 ms

Warmup time: < 50 ms

Output Signal Type: SDI-12

Digital I/O Signal Voltage Range: 3.6 to 5.0 V

Dimensions

Both LI-300 and LI-350 probes have the same external dimensions.