T8 EXTERNAL REFILLING FIELD TENSIOMETER

Measurements: Water Potential

Applications: Water Balance Studies

Long-Term Water Potential Monitoring

Developed for long-term monitoring applications, the T8 features a water level indicator that tells you when to refill and helps avoid caviation. Integrated external refilling means the T8 can be maintained without removing it from the soil. SDI-12 capability allows you to integrate the T8 into large sensor networks powered by a single data logger.

 

Typical Applications

  • Field measurements
  • Water balance, leaching, transport studies, model calibration
  • Ecological impact studies
  • Agricultural or forestal studies
  • In-situ retention curves
  • Data logger applications
  • Spot your readings in with the INFIELD7b

 

Advantages

  • Integrated amplifier with configurable output signals
  • Integrated soil temperature sensor
  • Integrated fill level indicator
  • Integrated external refilling: refill or empty the cup through capillary tubes without removing the T8 from the soil
  • Solid construction
  • Integrated datalogger function
  • tensioLINK RS485 interface
  • SDI-12 interface

 

Limitations

  • Not for dry soils

CERAMIC CUP

High-strength special ceramic with homogeneous porosity

Length: 60 mm

Diameter: 24 mm

TEMPERATURE SHAFT

Various lengths available (standard 200 mm)

Diameter: 25 mm

Material: acrylglass 19/25 mm

**Please indicate shaft length on your order!**

ACCURACY

Soil water tension: ± 0.5 kPa

Temperature: ± 0.2°C (-10° to 10°C), ± 0.5°C (-30° to 70°C)

OUTPUT SIGNAL ANALOG Selectable ranges: 2 x 0 ... 1 V / 2 V / 5 V
OUTPUT SIGNAL DIGITAL RS485 tensioLINK, SDI-12
CURRENT CONSUMPTION 7 mA
MEASURING RANGE SOIL WATER TENSION +100 to -85 kPa
DELIVERY CONTENTS Quartz clay powder, shaft water protection cover, calibration certificate, user manual
MEASURING RANGE TEMPERATURE -30° to 70°C
POWER SUPPLY 6 to 20 VDC
DATALOGGER COMPATIBILITY Campbell Scientific, Infield 7, and Em50 Series
CABLE 1.5 m; 8-pin plug M12; pigtail adapter available for connection with CSI dataloggers
UMS uses UV-resistant, durable materials for long-term field studies. Seals and screw connectors are watertight according to IP 68.

 

 

  MPS-6 MPS-2 T5/T5x* T4 T8 TS1
COST $$ $ $$$ $$$ $$$$ $$$$$
ACCURACY ± 10% of reading + 2 kPa from -9 to -100 kPa ± 25% of reading + 2 kPa from -9 to -100 kPa ±0.5 kPa ±0.5 kPa ±0.5 kPa ±0.5 kPa
RANGE -9 to -100,000 kPa -9 to -100,000 kPa +100 kPa to -85 kPa (-200 kPa*) +100 kPa to -85 kPa +100 kPa to -85 kPa +100 kPa to -85 kPa
POWER REQUIREMENTS 3.6-15 V, 10 mA 3.6-15 V, 10 mA 5-15 VDC 5-15 VDC 3.6 V-15 VDC 5-15 VDC
MEASUREMENT OUTPUT Digital SDI-12 Digital SDI-12 Analog Analog Digital SDI-12, RS-485 Digital SDI-12, RS-485
METHOD USED FOR DETERMINING WATER POTENTIAL Capacitance of a ceramic matrix, 6 point calibration Capacitance of a ceramic matrix, 2 point calibration Piezoelectric pressure sensor, Wheatstone full bridge
BEST FOR

- Long term research studies

- Natural environment monitoring

- Low cost irrigation monitoring

- Column & Spot Measurements in the Laboratory

- Small point measurements

- Long term field studies

- Vadose zone hydrology

- Long term field studies

- Vadose zone hydrology

- Long term field studies

- Vadose zone hydrology

- Monitoring in remote sites

waterpotential_graph-Edit-web.png

Auger Kits for Pore Water Samplers and Tensiometer

The cutting edge of the auger has a tapered tip similar to the shape of a Tensiometer or pore water sampler.  Thus, the bore hole is large enough to insert the shaft, but the cup will have a tight and perfect fit to the soil.

The not recommendable slurrying of the cup with quartz clay can be avoided.

A divisible auger set includes:

  • Cutting edge with tapered tip
  • Handle with hammering head

Parts have threaded connection and can be extended with one or more 100 cm extension rods.

Benefits

  • Simplifies installation of shafts
  • Avoids slurrying
  • Multipart - divisible - extendable
  TB-20 TB-25
Dimensions:    
  • Cutting Edge
22 mm dia. x 50 cm 26 mm dia. x 50 cm
  • Tip
20 mm dia. x 5.6 cm 24 mm dia. x 5.6 cm
  • Total length
1.25 m 1.5 m
  • For shafts with
20 mm dia. 24 mm dia.
Part no. TB-20/125 TB-25/150
Extension rod Part no. TBE-100  

 

Infield 7

The INFIELD7 is a multi-functional handheld read-out unit for all UMS tensiometers. Download readings to PC with accessory USB converter

Includes:

  • Memory for 250 readings
  • Vertical water column compensation for Tensiometers
  • T8 and TS1 configuration
  • Carrying case
  • 4 AA batteries

Looking for a data logger for long-term installations? Contact Decagon support at 1-800-755-2751.

 

Lab Refill Kit for Tensiometers

Lab refill kit for tensiometers (includes T4 and T8), includes stand with clamps, adapter that fits sensor body, 500 mL bottle, pressure gauge, tubes, beaker, and refilling syringe.

Refill Kit for External Refillable Tensiometers

Refill kit for external refillable tensiometers (includes T4e and T8), includes hand-operated vacuum pump, 500 mL bottle, refill syringe, tubes and valves.

TensioLINK USB converter

The tensioLINK USB converter is used for directly connecting sensors and devices with serial tensioLINK to a PC.  One can configure features and read out measured data. 

UMS devices with 8pin M12 connectors (e.g. TS1 or T8 tensiometers) could be directly connected to the converter without the need for a further power supply.  The sensor is powered through the USB interface.

Use with the PC-Software tensioVIEW.  Manual Software and Driver come along with supplied CD.

Sensor Supply 9 VDC / 100 mA tolerance +1 V
Short Circuit 2 Min.
Galvanic Isolation 1 kV
Serial Sensor Interface RS485-2 wire, ESD protection 15 kV
USB interface compliant to USB 1.1 and 2.0

 

Request Support

Email: support@decagon.com
Phone: 509-332-2756
Fax: 509-332-5158