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A current is applied to the WATERMARK to obtain a resistance value. The sensor consists of a pair of highly corrosion resistant electrodes that are embedded within a granular matrix. That resistance can be measured using the WATERMARK Sensor. As the tension changes with water content the resistance changes as well. In use since 1978, the patented WATERMARK sensor is a solid state electrical resistance sensing device that is used to measure soil water tension. Options for connecting IRROMETER tensiometers to data collection or control devices are available, including switching gauges as well as 4-20mA and 0.5V to 4.5V output transducers.įor a spec sheet on available output options, click here. Its compact size and replaceable "Quick-Flo" tip make it the best choice for green house applications. Ideal for use with very coarse soils and non-soil container-media. IRROMETER "MLT" (Miniature Low Tension) - designed for applications similar to the Model "LT" above.
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Instrument includes a threaded replaceable (blue) Quick-Flo tip as well as reservoir, air free gauge chamber and hermetically sealed IRROMETER vacuum gauge with dual scale of centibars and kilopascals (0-40 cb range)
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Ideal for very coarse soils and non-soil container-media or where rapidly changing soil water status needs to be observed. The "LT" (low tension) Irrometer is designed for situations where tensions above 30 cb (kPa) are rarely expected. Instrument includes a threaded replaceable tip as well as reservoir, air free gauge chamber and hermetically sealed IRROMETER vacuum gauge with dual scale of centibars and kilopascals (0-100 cb range)
![watermarque 100 us watermarque 100 us](https://www.elektronik-labor.de/AVR/DDSGenerator-Dateien/image019.jpg)
The "SR" Irrometer is the standard instrument for use in medium to heavy soils.