Tel: +44 (0)1428 661 660

TDR Systems

Accurate Soil Moisture Measurements

Soil Moisture using TDR technology

TDR (Time Domain Reflectrometry) technology delivers very accurate determination of soil moisture content. The soil moisture content is calculated inside the unit and the collected data can be read from a handheld unit, logged or sent via a telemetry network to a PC for analysis.

This technology is very specialised and Van Walt is proud to represent the new range of soil moisture meters, loggers and telemetry options from IMKO, an award winning German manufacturer.  Precision TDR meters and systems at prices equivalent to good quality capacitance probes.

Soil Moisture readings for top layers

Using a highly accurate TDR probe like the Pico 64 or Pico 32 for:

  • Highly accurate TDR technology
  • Direct measurement of soil moisture content
  • Integrated soil temperature sensor
  • Soil electrical conductivity measurements
  • Large measurement volumes
  • User replaceable rods.
  • Trime Pico 32 or Trime Pico 64 probes can be networked, logged or read manually with the HD2 display unit.

How it works

To take measurements the probe rods are inserted into the soil and within a few seconds the moisture measurement and soil EC values and temperature are presented on the HD2 display.

The operating mode "Normal" shows you at a glance the value of Moisture, Temperature, and the RBC (material conductivity).

Manual Soil Profiling Systems

For the accurate measurement of soil profiles the first ever TDR tube access probe - IPH is designed for moisture content profiling:

  • Measurements in 160mm  increments to a depth of 3 meters in any number of access tubes
  • Special polycarbonate access tubes are installed prior to taking measurements and can be safely left in the soil
  • 0...60% volume soil water-content measurement
  • Continuous and non-destructive determination of volumetric soil moisture
  • Rugged and strong construction for the toughest demands of continuous field use
  • Can be connected to an HD2 readout device or a PICO BT Bluetooth system with PDA

How it works

The IPH probe generates a high frequency pulse (up to 1GHz) which propagates along the metal shells, generating an electromagnetic field around the probe. At the end of the shells, the pulse is reflected back to its source. The resulting transit time can be measured and enables the determination of the propagation velocity, which is primarily dependent on the water content. The volumetric water content is then calculated by the velocity and is shown on the display panel immediately.

Automatic Soil Profiling System – Pico Profile

Advantages

A new generation of modular probes for the precise measurement of soil moisture given as a percentage by volume for selected soil horizons of up to 3 metres.

Benefits:

  • Ideal for the development of soil-water balance models, irrigation control and salt content testing at different soil depths
  • Continuous and gap-free measurement of soil moisture from the surface up to 3 meters
  • A modular design allows up to 10 measurement segments
  • Each measurement segment can be calibrated to a particular soil horizon type to provide even higher precision
  • Will measure the electrical conductivity EC in a soil
  • A measurement reproducibility <0.2% enables the use in lysimeters, as a substitute for elaborate determination of the weight
  • Simple modular configuration
  • Calibration curves for different soil types
  • Compatible with the GlobeLog wireless modem and standard dataloggers with a SDI-12 interface
  • Rugged & waterproof design for long-term monitoring in harsh environments
  • Available in 10, 30 or 80cm lengths.

Specifications: Automatic Soil Profiling System – Pico Profile

Measuring Segment PICO-T3P
Power supply 7V..24V-DC
Power consumption 100mA @ 12V/DC during 2...3sec. of measuring
Moisture measuring range 0..100% volumetric water content
Accuracy (in % volumetric water content) ±2%
Repeating accuracy ±0,3%
Conductivity measuring range ECw 0...>20dS/m
Measurement volume 1000ml
Operating Temperature -15°C..50°C
Calibration Selectable calibration curves:
- Universal soil calibration (soil ±3%)
- Dielectric Permittivity
Size PICO-T3P 200 x ø40mm
Access tube 1-3 Meter with Tecanat tube ø44mm, up to 25 Meter available with special version
Spacer between two PICO-T3P segments Aluminium ø32mm, from 50mm to 1000mm available
Interfaces IMP-BUS
RS485 or SDI12
Cable 5m cable, longer on request

Videos, Manuals & Downloads

Contact

Please email sales@vanwalt.com or click here to complete our enquiry form.

Pico GlobeLog®

Advantages

GlobeLog® represents a new generation of dataloggers. IP67 rated the globeLog is a small field datalogger for soil moisture and other measurement parameters which works under extreme environmental conditions.

Benefits:

  • Connects up to 48 sensors
  • Up to 500,000 data measurements
  • Data transfer can be automatic via a modem or Internet data visualisation
  • Robust, lightweight, weatherproof (IP67)
  • Ultra Low Power
  • Easy to use with little programming

Specifications: Pico GlobeLog®

Pico GlobeLog®
Sampling frequency 1 minute up to 1 day
Inputs Up to 48 TRIME probes or other sensors
Memory 2 MB EEPROM about up to </= 500,000 measurements. The working time depends on the reading frequency & number of modules
Power Ultra low power consumption, external battery 12VDC or solar power supply.
Modus "on": 10mA
Modus "sleep": 30 uA
Modus "modem active": 7-10mA
Modus "data transfer": 100mA
Monitoring of external power supply
Operating -30 to +70°C, weatherproof case IP67
Dimensions 180 x 100 x 60mm, 780g
Interface RS232/V24, USB compatible
3 x IMP bus interface (power management)
1 x IMP bus interface (permanent power)
Modem Internal (optional) low power: GPRS
Software GlobeLog control: configuration and data acquisition software for MS-Windows
Data format ASCII which allows to use the data in other programmes & formats such as Excel
Applications
- Agrotechnique
- Geology
- Building industry
- Meteorology
- Soil science and others.

Videos, Manuals & Downloads

Contact

Please email sales@vanwalt.com or click here to complete our enquiry form.

Multiple probe/telemetry sensor systems

Advantages

TRIME® system technology is as intelligent as the TDR measurement method so for major environmental, earth sciences, hydrology, forestry and agricultural projects bespoke systems can be developed incorporating modular, flexible, and the extendable set-up of TRIME® probes and other sensors (which work under extreme environmental conditions so can be buried in the ground for long term onsite deployment) as part of a telemetry network, with simple network administration and software package - GlobeLog control for data recovery and analysis

Benefits:

  • Innovative dataloggers with GPRS radio transmission
  • Connects up to 48 sensors
  • 2 MByte data storage capacity
  • Data transfer via cellular radio
  • Internet data visualisation
  • Robust, lightweight, weatherproof (IP67)
  • Easy programming with simple network administration
  • Ultra Low Power
  • IP67 protection
  • Modular, flexible, and extendable set-up

Specifications: Multiple probe/telemetry sensor systems

Datalogger GlobeLog®
Casing:
Protection class IP67
Dimensions 175 x 80 x 55mm
Weight 1,1kg
Connectors Circular plug-in connector with inserted nuts, Binder Serial No: 723
Power supply
External 10..24V/DC (12V recommended)
Power consumption:
Sleep (between the measurements) Approx. 0,1mA
Idle (active, but no measurement) Approx. 10mA
During the measurement Approx. 35mA (only Logger, sensors according to configuration of the system)
During the data communication 30..50m According to network quality
Temperature
Logger From -40 to +60°C
Modem From -20 to +60°C (sub-limit selectable, lower than -10°C with limited functionality)
On-site data transmission:
Interface RS232
Required Software GlobeLogControl
Required Hardware Windows-PC with Windows 2000 or higher
Remote data transmission:
Hardware Internal Quad-Band GSM-Modem
Data service GSM/GPRS
Transfer protocol http
Transferring costs (daily data transmission) Lower than 1€ (in Germany, country-specific, nevertheless you have to pay only for local connection)
Required Software (for remote maintenance and data storage) GlobeLogControl
Required Hardware Windows-PC with Internet access, Windows2000 or higher, data will be transferred via e-mail by the GlobeLog Logger
Data storage/Data logging:
Storage type Data memory Flash (non-volatile memory)
Memory size 2MB
Organisation Data will be recorded until the memory is full. Further accumulating data will be lost
Measuring interval 1min..12h
Number of measured data >250.000
Erasing of measured data On-site or via remote data transmission DFÜ (optional)
Input channels:
IMP-Bus 1-4 Up to 48 channels (Sensors can be up to 3-channels)
IMP-Bus 1-3 For Sensors with switched supply voltage (is switched of between the measurements)
IMP-Bus 4 For Sensors with permanent voltage
Housekeeping channels 1x internal temperature
1x supply voltage
1x voltage of back-up battery
Internal Clock:
Type Real-time clock
Accuracy Maximum aberration 2 sec per day (adjustable in sensitivity depending on ambient temperature)
Synchronisation
On-site Manual with GlogLogControl Software
Remote data transmission Automatically while each data transmission
Power supply Via supply voltage; during a power failure on the internal buffer battery (lifetime 4-6 years)
Accessories:
Power cord 2m with 5-pol Binder connector and 2x Banana plug
RS232-cord 6-pol Binder connector und DB9 connector
CD with GlobeLogControl Software Windows 2000 or higher
Manual English

Videos, Manuals & Downloads

Contact

Please email sales@vanwalt.com or click here to complete our enquiry form.