2013 tms gvu tensiometer

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Field Tensiometer from UMS
by Team Medical & Scientific Sdn. Bhd.
Email : info@tms-lab.com

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2013 tms gvu tensiometer

  1. 1. Tensiometry for the 21stCentury: Principles,Innovations Field andApplicationsGeorg von UnoldTMS – Seminar 2013
  2. 2. Sole Distributor : Team Medical & Scientific Sdn. Bhd.Tel : 03-5122 5108Email : info@tms-lab.com
  3. 3. • Water in soils, as well as on the surface will always move from areas of higherpotential to areas of lower potential.Some Background on tensiometersTMS – Seminar 2013
  4. 4. Content Some background on tensiometers How do tensiometers work Assembly of tensiometers Types of tensiometer T4 T4e T8 TS1 T5 T5x Refill kits (T4, T8) Data collectionTMS – Seminar 2013
  5. 5. Soil specific RelationPotential to Water ContentTMS – Seminar 2013
  6. 6. Tensiometer range10.05.2013 TMS – Seminar 2013
  7. 7. Sensors & applications10.05.2013 TMS – Seminar 2013
  8. 8. Assembly of a tensiometerReference airpressureHigh grade ceramic cupFilled with degassed water.Pressure sensorSensor body inclelectronics (T8)ShaftRefilling tubeTemperature sensor(T8)TMS – Seminar 2013
  9. 9. How do tensiometers work?Soil water and Tensiometer water havecontact through a porous ceramic A wettedporous ceramic creates an ideal pore/waterinterface. The ceramic is permeable forwater, but not for air up to 15 bars tension.So we can measure tension.The soil water tension is directly conductedto the pressure transducer which offers acontinuous signal.The atmospheric reference pressure isprovided through a membrane on the cable,a distinctive patented method.TMS – Seminar 2013
  10. 10. The T4/T4e Tensiometer The T4/T4e Precision tensiometer is made for outdoormonitoring projects These tensiometers work from +100 kPa (water pressure)to -85 kPa (suction / soil water tension). If the soil gets drier than -85 kPa, the Tensiometer runsdry and must be refilled as soon as the soil is sufficientlymoist again. The T4 is available in 2 versions: the standard T4 withoutrefilling tubes, and the T4e with refilling tubes forrefilling the Tensiometer with a syringe.Types of tensiometerTMS – Seminar 2013
  11. 11. The T4/T4e TensiometerMeasures +100 kPa ... -85 kPaBridge Signal: +100 mV ... -85mVTypes of tensiometerApplicationsField measurementsWater balance, leaching, transport studiesEcological impact studies , model calibrationAgricultural or forest studiesIn-situ retention curvesData logger applicationsSpot readings with the INFIELD7bBenefitsReliable outdoor tensiometerSolid constructionInstallation in any orientationYear-round operation deeper than 30 cmLimitsWill not work in dry or frozen soilsTMS – Seminar 2013
  12. 12. T4 Tensiometer refilling To assure rapid and reliable measurement of the soilwater tension, the cup must be filled, bubble-free, withdegassed water. After dry periods or periods with wetand dry cycles, the T4 or T4e must be refilled.The following items are required for all refilling methods: Syringe with valve (one supplied with each order) Degassed, de-ionized or distilled water Measuring device for checking the pressure signalTypes of tensiometerTMS – Seminar 2013
  13. 13. The T4-e Tensiometer refilling The T4e is equipped with 2 stainless-steel capillary tubeswhich lead through the cable gland and the shaft. Eachone has an opening that ends inside the ceramic cup. The main advantage of the T4e is:it allows easy refilling of the T4e while it remainsinstalled in the ground. Tube 1 ends at the very tip of the cup, tube 2 ends nextto the pressure transducer opening. Outside, both tubesare connected with a short rubber tube. Any air bubbles will ascend and accumulate either in theceramic’s tip around tube 1 (upwards installation angle)or next to opening 2 (downwards installation angle).Accordingly the air is removed either through tube 1 or 2Types of tensiometerTMS – Seminar 2013
  14. 14. The T8 Tensiometer The T8 is ideally suited for long term monitoring projects. These tensiometers work from +100 kPa (water pressure) to -85kPa (suction / soil water tension). If the soil gets drier than -85 kPa, the Tensiometer runs dry andmust be refilled as soon as the soil is sufficiently moist again(syringe refill unit) The electronics are integrated in the body of the T8. Thehousing is made of fiberglass reinforced plastic. The electronicsare completely sealed and thus well protected against moisture. The T8 version 2005 has an internal microprocessor and offerswater tension and temperature as analog output signals plus therefilling status as a digital signal. To change the signal range settings or use the serial interface ofthe T8, use the tensioLINK® USB converter and WindowstensioVIEW® softwareTypes of tensiometerTMS – Seminar 2013
  15. 15. The T8 TensiometerMeasures +100 kPa ... -85 kPaSignals: configurable Interfaces:tensioLINK, SDI12Types of tensiometerApplicationsField measurementsWater balance, leaching, transportstudies, model calibrationAgricultural or forest studiesIn-situ retention curvesData logger applicationsSpot readings with the INFIELD7bBenefitsIntegrated amplifierIntegrated soil temperature sensorIntegrated fill level indicatorIntegrated external refilling: Solid constructionLimitsWill not work in dry or frozen soilsTMS – Seminar 2013
  16. 16. T8 Tensiometer refilling To assure a rapid and reliable measurement of the soilwater tension, the cup must be filled, bubble-free, withdegassed water. After dry periods or periods with wetand dry cycles, the T8 must be refilled.The following items are required for all refilling methods: Syringe with valve (one supplied with each order) Degassed, de-ionized or distilled water Measuring device for checking the pressure signalThe refilling procedure is similar as for the T4eTypes of tensiometerTMS – Seminar 2013
  17. 17. TS1 Tensiometer The TS1 has a self refilling multipurpose tensiometerwith an internal computer controlled pump for longterm monitoring projects These tensiometers work from +100 kPa (waterpressure) to -85 kPa (suction / soil water tension). The TS1 combines the principles of a pressuretransducer Tensiometer to measure the soil watertension and a pore water sampler that extracts soilsolution through a porous ceramic: inside the TS1 abidirectional miniature pump is integrated betweenpressure transducer and ceramic cup. Amicrocontroller controls the functions of pump andsensors. To refill the cup a negative pressure, lowerthan the water tension in the surrounding soil isestablished to draw water into the ceramic cup. Excesswater is released through an exhaust back into the soil.Types of tensiometerTMS – Seminar 2013
  18. 18. TS1 designTMS – Seminar 2013
  19. 19. TS1 TensiometerMeasures 100 kPa ..-85 kPaSignals: configurableInterfaces: tensioLINK, SDI12LimitsDoes not measure when soilis dry or frozenTypes of tensiometerApplicationsField measurements of pF/wcEcological impact studiesAgricultural studiesModel calibrationLong time monitoring studiesWater balance and transport studiesBenefitsAutomatic self-refilling and deaeratingContinuous fill level controllingOptional pore water samplingAutomatic emptying before frostIntegrated soil temperature probeAuto logging functiontensioLINK and RS485 interfaceLow maintenanceTMS – Seminar 2013
  20. 20. T5 Tensiometer These Tensiometers work from +100 kPa (waterpressure/level) to -85 kPa (suction/soil watertension) The T5x, with extended range goes to a lowertension of at least -200kPa. The T5 Miniature Tensiometer is especiallydesigned for point measurements, e. g. in soilcolumns, pots or laboratory lysimeters, or whenthe measurement of a minimal span is desired. With an active surface of only 0,5 cm2 and adiameter of 5 mm the ceramic tip has alladvantages of small dimensions: little soildisturbance, point pick-up and fast response.TMS – Seminar 2013
  21. 21. T5 TensiometerMeasures +100 kPa ...-85 kPaBridge Signal +100 mV ... -85 mVLimitsTypes of tensiometerApplicationsPoint measurement of water potentialMiniature lysimeter studiesLab determination of pF/wc and K/PsiBenefitsAccurate zero-tension readingFast response: With sufficient fillingthe T5 responds within 5 secondsto an applied air pressure changeof 0 to 85 kPaMost standard T5 reach a range ofat least 150 kPa when delivered.LimitsNot for dry soils, not frost resistantIn the field applications requireimpact protectionTMS – Seminar 2013
  22. 22. T5x Tensiometer with extended range The special version T5x is tested to reach a measuring range of -160 kPawhen delivered. To achieve this, the T5x requires an absolutely bubble freefilling. The T5x often goes to -250 kPa before running empty, and sometimes evento -450 kPa, but this is an exception and cannot be guaranteed. The T5x is identical with the T5 but has a different ceramic. The extendedmeasuring range is made possible by an effect called boiling retardation, thespecial ceramic with smaller pores and, as a necessary condition, anabsolutely gas free filling.Types of tensiometer30020085tension [kPa]timemeasuringrangebestpossibleT5xStandardT5 readingrangeTMS – Seminar 2013
  23. 23. The T5/T5x Tensiometer refilling To assure a rapid and reliablemeasurement of the soilwater tension, the cup mustbe filled, bubble-free, withdegassed water. After dryingcycles the T5 must be refilledwith the T5-set.Types of tensiometerTMS – Seminar 2013
  24. 24. T5/T5x Tensiometer refilling It is easy to refill the T5 withoutany vacuum pump with the T5-Set with several syringes. Checking the refilling status, therefilling procedure itself and theresponse after refilling with thehandheld unit INFIELDTypes of tensiometerTMS – Seminar 2013
  25. 25. T5/T5x Tensiometer refilling Refilling the cup withdegassed waterTypes of tensiometer Refilling the body withdegassed waterTMS – Seminar 2013
  26. 26. Refill kitsRefill kits for T4/T4e and T8The following requirements are obligatory: Deionized water Degased water INFIELD 7 Handheld to control the refiling processFor laboratory refilling we recommend our BKT456 Refill kitFor field applications we recommend the BKTex or a simple syringe kitTMS – Seminar 2013
  27. 27. Reading and Data LoggingInfield 7 The INFIELD7, is a multi-functional handheldread-out unit for Tensiometers and other soil probes. The following probe types can be connected:UMS Tensiometers T1, T3, T4, T5, T8 and TS1SIS smart gypsum blockWatermark and Soilmoisture gypsum blockFD Thetaprobe ML2xFD EchoprobeTemperature probesAdvantages Memory for 250 readings Vertical water column compensation for Tensiometers T8 and TS1 configuration Download readings to PC with accessory USB-connector cable Firmware capable for upgradesTMS – Seminar 2013
  28. 28. Logger & tensioLink -applicationTMS – Seminar 2013
  29. 29. tensioViewTMS – Seminar 2013
  30. 30. tensioLinkTMS – Seminar 2013
  31. 31. Thank you!10.05.2013 TMS – Seminar 2013

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