TDT – Acclima ME

Acclima True TDT Soil Moisture Sensor (SDI-12)

Product Summary

Introducing the Acclima Digital TDT® Soil Moisture Sensor: Setting New Standards in Precision Irrigation.

Utilized globally, this innovative TDT soil water content sensor, also known as a soil moisture probe or meter, delivers accurate measurements of Volumetric Water Content (VWC), Bulk Electrical Conductivity (EC), and temperature. With temperature accuracy within 0.5˚C, it ensures precise environmental monitoring.

A Game-Changing Solution in Irrigation Technology,
The Acclima Digital TDT® soil moisture sensor represents a groundbreaking leap in the irrigation sector. It pioneers the integration of digitized Time Domain Transmissometry (TDT) technology into a cost-effective instrument, offering unparalleled accuracy in providing absolute soil moisture readings across diverse temperature and soil chemistry conditions conducive to crop growth. No other TDT soil water content sensor available matches its level of accuracy and stability. Independent validation from leading soil physicists supports these claims, with test data accessible upon request.

Advanced Connectivity and Compatibility,
Equipped with a modified SDI interface, this Digital TDT sensor seamlessly interfaces with Acclima data loggers or any third-party SDI version 1.4 compliant device. The Acclima modified SDI interface features auto-detection and collision repair addressing capabilities, ensuring efficient data transmission and integration with Acclima data logging systems.

In summary, the Acclima Digital TDT® soil moisture sensor redefines precision irrigation, offering unparalleled accuracy, stability, and compatibility for optimal soil moisture management worldwide.

Key Features

Measures Water content, EC, Temperature, and %VWC.
Works in ALL soils with No calibration.
The first TDT-accurate soil moisture sensor offers precise readings across all conditions at a low cost.
Sturdy construction. Long-term reliability.
No other TDT soil moisture sensor rivals it on the market.
SDI-12 Interface.
Ultra-low power consumption.
Made with durable inert materials

Characteristics

Physical

Dimensions (without cable): 20 cm x 5.33 cm x 1.5 cm
Weight (with 5m cable): 299 grams
Composition: Type 304 stainless steel, crystalline-epoxy
PVC (insulation) cable: 3 conductor, 22 ga PVC sheath, 5
meters

Environmental

Operating temp range: 1 ̊C to 50 ̊C for VWC (no ice), -20
̊C to 50 ̊C for the other data
Storage temp range: 20 ̊C to 75 ̊C
Lightning and surge protection: 6 kV @ 3 kA, 8/50 µs

Operating

Volumetric water content: 0 to 100%
Resolution: 0.06% VWC
Absolute VWC accuracy: ±2% typical
VWC soil EC stability: ±1% of full scale 0 to 5 dS/m BEC
Temp reporting accuracy: ±2 ̊C from +1 ̊C to +50 ̊C
EC reporting accuracy: ±0.2 dS/m 0 to 5 dS/m BEC

Architectural

Technology: Waveform digitizing time domain transmissometer
Effective acquisition bandwidth: 200 giga-sample/second
Propagation time resolution: picosecond
Waveform propagation resolution: 1.5 mm in air, 0.16 mm in water
Waveguide length: 30 cm
Permittivity to VWC calculation: Modified dielectric mixing model
Propagation waveform bandwidth: >2 GHz

Communications

Communication protocol: SDI-12 Revision 1.4
Maximum cable length: 60 meters

Power

- Operating Voltage Range: 6–15 VDC
- Listening/Sleep Mode Current: 60 µA at 50 ̊C
- Communications Current: 6 mA typical, 8 mA max
- Read Moisture Comm Time: 425 ms total for each read cycle
- Moisture Sense Current: 84 mA at 12VDC input, 98 mA at 8 VDC input, 110 mA at 6 VDC input
- Moisture Sense Time: 450 ms each sensing operation

User Manual