Measure the Whole Range!

Tensio 100 - Mobile field tensiometer

The Tensio 100 is the origin of the UGT-tensiometer technology and has been continuously further developed for over more than 25 years. It is a cost-efficient tensiometer type that is especially designed for easy and fast mobile pressure head measurements in the field. The Tensio 100-set comprises a V2A-insertion auger for quick installation, as well as a protective tube for transportation, in which the tensiometer is kept permanently moist for immediate use and is protected from mechanical damage. In the tensiometer head, made of transparent acrylic glass, air inclusions are easily recognizable. The pre-tensioning screw enables an easy refilling even in the field. Additionally, this screw allows to preset a tension to reduce the measurement time to less than 3 seconds per measurement (from installation to reading).

The measurement corpus itself is made of a V2A-standpipe (Ø 10 mm), a Ms support, a ceramic cell (SKA 100FF, 10x24 mm), and a V2A tip. Depending on the type of Tensio 100 the suction pressure is displayed on a mechanical precision vacuum meter (Ø 63 mm).


Tensio 100

  • Displays the current suction pressure on a mechanical pointer manometer
  • Basic and cost-efficient system
  • Very suitable for teaching purposes, since the measurement principle is clearly understandable
  • The overview printed on the back of the tensiometer head  enables a fast classification of the measurement value even without specialised knowledge
  • Very suitable for short-term measurement campaigns with many measurement points, such as mapping the current tension distribution or the determination and optimisation of the irrigation status in agriculture, as well as for concomitant reference measurements for other sensors (for example soil moisture) or as basis for sampling
  • No data recording
  • Not suitable to remain in the field


    Installation and Maintenance

    The Tensio 100 – set is designed for the mobile tension measurement in the field. Accordingly simple is the installation. The necessary auger is included in the set and can be stowed safely in the provided protective tube together with the tensiometer. Insertion auger and tensiometer are matched in their size and shape. Simply prepare the whole to the designated depth using the auger and then prick the tensiometer into the prepared hole until the tip is pressed into the bottom of the hole. The Tensio 100 is designed for vertical installation.

    Stowed in the protective tube the Tensio 100 stays ready to use at all time and can be transported from one measurement site to another without the risk of drying out. Further the tube protects against damage from mechanical force. If air bubbles arise in the course of a measurement or the tensiometer falls dry, it can easily be refilled in the field. Only a container with water is needed for that. No tools are required.

    Because of the frequent installation as a part of the planned operation concept, there is an increased risk of damages of the ceramic cup. Therefore the ceramic of the Tensio 100 can be easily and independently exchanged in the field.


      • Can be easily and safely transported in the protective tube
      • Always ready to use
      • Robust design
      • Fast and simple measurement
      • Short reaction time (<3s)

        Technical specifications

        Tensio 100
        Pressure measurementPrecision vacuumeter
        Measurement range Tension0 … +85 kPa
        Output unit    bar
        Accuracy0,01 bar
        Resolution0,01 bar
        DataoutputManual reading
        Data memory/
        Power supply/
        Degree of protectionIP54
        Response time according to RICHARDS< 3 s

        Operating temperature

        0 … 40 °C

        Length24 mm
        Diameter10 mm
        Air entry point>-85 kPa
        Hydraulic conductivity8.1x10-8 m/s
        Length30 cm /60 cm / 90 cm / customised on request
        Diameter (outer)10 mm
        MaterialV2A stainless steel

        Ordering Details:

        Part. No.:  101100               Standpipe length 30 cm
        Part. No.:  101200 Standpipe length 60 cm
        Part. No.:  101300Standpipe length 90 cm



        Related Products:

        Protective capProtects the ceramic cup from drying out and mechanical damage. Suitable for Tensio 100 / Tensio 150 / Tensio 160
        V2A-Insertion augerNon-destructive and simple installation of the tensiometers and optimum connection to the pore system of the soil. Suitable for  Tensio 100 / Tensio 150 / Tensio 160
        Spare parts kit Ceramic cups SKA 100 FFSpare parts kit for repair and maintenance of tensiometers for Tensio 100 / Tensio 150 /Tensio 160

        Video Tutorial

        Range of Applications

        • Determination of the current state of the plant water availability
        • Reference measurements for irrigation optimisation
        • Reference measurements for existing measurement systems
        • Short- and middle-term monitorings in the fields
        • Prepration/planning of new measurement campains

        Exemplary Applications


        Technical University of Munich - Chair of Hydrology and River Basin Management

        • Application of the Tensio 100 for teaching purposes as part of pedological and hydrological practical courses. The Tensio 100 tensiometers are particularly suitable for this application as the principle of the measurement is easily recognizable and therefore the principle of the tension in the soil is easily conveyed. Further the tensiometers can be used easily and without any specific previous knowledge and do not require any peripherals such as readers, data loggers or power supply. The Tensio 100 tensiometers are inexpensive and very robust and can be repaired inexpensively if damaged. Therefore the regular application of the tensiometers by unexperienced users is not a high risk.


        SGL Spezial- und Bergbau- Servicegesellschaft Lauchhammer mbH

        • Application in the framework of the monitoring of the Witznitz dump. The Tensio 100 is specifically suitable for the control and renaturation of open pit mining residues due to its flexibility in application and its high robustness.

        Principal Office Müncheberg

        Umwelt-Geräte-Technik GmbH
        Eberswalder Str. 58
        15374 Müncheberg
        Tel.: +49 (0) 33432 7559-0

        Branch South

        Umwelt-Geräte-Technik GmbH
        Munich Airport Business Park
        Lindberghstr. 7a
        85399 Hallbergmoos
        Tel.: +49 (0) 811 124478-0