T4 Field Tensiometer
- Measurements:
- Applications:
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 readings in with the INFIELD7b
Advantages
- Reliable outdoor tensiometer
- Solid construction
- Year-round operation when installed deeper than 30 cm
- T4e can be refilled or emptied without removing it from the soil.
Limitations
- Not for dry soils
- Installation angle between 20° and 70°. At vertical and horizontal installation an air bubble will remain in the cup.
Specifications
Part number 45201
| Ceramic Cup | High-strength special ceramic with homogeneous porosity Length: 60 mm Diameter: 24 mm |
|---|---|
| Temperature Shift | Temperature-compensated, typical shift 0.5% FS over 20K Stability typical shift < 0.5% p.a. |
| Temperature Shaft | Various lengths available (standard 300 mm) Diameter: 25 mm Material: acrylglass 19/25 mm **Please indicate shaft length on your order!** |
| Sensor | Piezoresistive pressure-transducer Max. overpressure: ± 3000 hPa |
| Output Signal | -1000 hPa = -100 ± 3 mV 0 hPa = 0 ± 3 mV 850 hPa = 85 ± 3 mV Galvanic sensor insulated from soil water, signals analog and continuous Accurate values according to the calibration certificate. Impedance: ~.5 kOhm |
| Measuring Principle | Soil water tension, transmitted via ceramic cup into the tensiometer, onto the water and pressure transducer, giving a continuous analog signal |
| Electronic Principle | Asymm. Wheatstone full bridge |
| Power Supply |
10.6 VDC (5 - 15 VDC), stabilized |
| Range | +1000 to 0 to -850 hPa |
| Accuracy | + 0.5 kPa |
| Current Consumption |
~1.3 mA (at 10.6 V) |
| DATALOGGER COMPATIBILITY |
Campbell Scientific Loggers: CR10X, 21X, 23X, CR1000, CR3000, etc |
| Cable | 1.5 m: 4-pin plug M12 |
|
UMS uses UV-resistant, durable materials for long-term field studies. Seals and screw connectors are watertight according to IP 68. |
|
Comparisons
| Acrylic Shaft diameter | 25 mm |
|---|---|
| Acrylic Tube Length |
10 - 200 cm |
| Ceramic Cup diameter | 24 mm |
| Ceramic Cup Length |
60 mm |
Accessories
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
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.t
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 und 2.0 |
Support
Troubleshooting Articles
Manuals
Request Support
Email: support@decagon.com
Phone: 800-755-2751 or
509-332-2756
Fax: 509-332-5158
Or send us an information request: