Soil Water Salt Thermal VelocimeterRD1200 is a new product launched by Acclima Corporation in the United States on May 7, 2019. It is designed to be portable and can directly read soil moisture, soil temperature, dielectric constant, soil volume conductivity, and pore water conductivity. It has a built-in GPS module and can synchronously display longitude, latitude, altitude, and automatically update time. The soil sensor adopts TDR315L soil water salt heat sensor, which has high measurement accuracy and good stability. It has been used in multiple soil survey centers such as the Chinese Academy of Geological Sciences, China University of Geosciences, Beijing Hydrogeological Survey Brigade, China Soil Survey Bureau (Nanjing, Shenyang, Xi'an, Chengdu, etc.), Hebei Institute of Geology and Environment, North China Water Institute, Gansu and Xinjiang Geological Exploration Center, Qinghai Institute of Gas, Chinese Academy of Sciences, and zoning of the Chinese Academy of Sciences. Long term use by multiple research institutions.

Technical indicators:

Soil volumetric moisture content:0～100％ VWC

resolution：0.1％ VWC

Repeatability（RMSDeviation)：0.07%

Accuracy:± 1% (coarse medium)

±2.5％(Fine textured medium)

Soil temperature:-40～+60℃

resolving power:0.1℃

Repeatability（RMSDeviation)：0.1%

Accuracy:±0.25℃

Range of dielectric constant:1～80

resolution：0.1

Repeatability（RMSDeviation)：0.07

Accuracy:± 1% (coarse medium)

±2％(Fine textured medium)

Soil volumetric conductivity:0～5000μS/cm

Pore water conductivity:0~55000μS/cm

resolution：1 μS/cm

Repeatability（RMSDeviation)：3 μS/cm

Accuracy:±25 μS/ cm@0 ~1000μS/cm

±2.5%@1000~2000μS/cm

± 5%@2000~5000μS/cm

RD1200 Reading Instrument

Channel signal:1 SDI12

built-inGPS Global Positioning Module

Internally storing various soil types such as soil, sand, clay, etc

Data can generate ripple curves

Equipment power supply:100V~240VAC output 5V1A

Built in rechargeable lithium battery:18650mA

Data: Display maximum, minimum, average, and last collected data

Data: Built in data storage module and25GB USB flash drive for copying data to USB flash drive

Size:15cm*8cm*2.5cm

Equipment weight:0.3kg

Technical remarks:

Soil conductivity is calculated by measuring the soil resistance between waveguide elements. Soil conductivity is composed of soil volume conductivity (particle), pore water conductivity, and soil volume surface conductivity (particle surface).

Soil volumetric conductivity: a physical quantity of soil conductivity

Pore water conductivity: concentration of pollutant particles in soil volume

EC_b=n^mEC_W

EC_bSoil volumetric conductivity, EC_WPore water conductivity,nSoil porosity,M is a parameter related to soil properties