Tensior T8 - Eijkelkamp Agrisearch Equipment

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8.2 Connecting the IR-indicator Some datalogger types require a pull-down resistor (for example 10 kOhm) against ground for the IR-indicator. Other logger types already have an internal pull-down resistor, or a pull-up resistor to 5 V, for example for connecting a reed switch. The external pull-down resistor must be smaller than the logger internal pull-up resistor or at least be in a relation so the logger will recognize the zero level. 8.3 Wire specifications 26 white = V in Power supply plus, 6 … 20 V DC brown = GND Power supply minus green = Signal + Soil water tension plus red = Signal Temp Temperature plus yellow = Signal - Minus for soil water tension and temperature grey = Signal IR IR-indicator, switched with Vin pink = Calibration SDA (digital) blue = Calibration SCL (digital)
9 Protecting the measuring site 9.1 Theft and vandalism The site should be protected against theft and vandalism as well as against any farming or field work. Therefore, the site should be fenced and signposts could give information about the purpose of the site. Cables should be protected against rodents. 9.2 Frost Tensiometer are filled with water and therefore are endangered by frost! With temperatures below–5°C do not leave filled Tensiometers in your car, in a measuring hut, etc. Do not fill the Tensiometers with Ethanol, as this is corrosive for some materials (i. e. PMMA) and might destroy these.. Also it is not recommendable to fill the Tensiometers with Decalin, monoethylene-glycol, di-ethylene-glycol, etc. These could harm any of the materials, destroy the ceramic cup or leak into the soil. Specially designed Tensiometers which can be filled with Ethanol are available on request. They can be used to temperatures down to - 20°C. 9.3 Lightning Measuring instruments in the field are always endangered by over-voltages. Whenever technically feasible, over-voltage and false polarity protection are realised. If you have questions about an optimal integration of the <strong>T8</strong> into a measuring system, please contact our system engineers. Still, there is no absolute certain lightning protection! Lightning strokes are not predictable. The more extensive a site is, the more import is the installation of a protection system which could be passive with ground spears – preferably 27
Page 1: User Manual T8 Tensiometer Version
Page 4 and 5: Table of contents 1 Content of deli
Page 7 and 8: 1 Content of delivery The delivery
Page 9 and 10: installed in the next lower level h
Page 11 and 12: 4.2.2 Temperature sensor A Pt1000 1
Page 13 and 14: 5 Refilling To assure a rapid and r
Page 15 and 16: 7, Before screwing the cup onto the
Page 17 and 18: 3, Close the valve of the vacuum tu
Page 19 and 20: 6.2 Offset correction for non horiz
Page 21 and 22: cup is in a higher position than th
Page 23 and 24: 7.8 Documentation For every measuri
Page 25: 8 Connecting the T8 The T8 is fitte
Page 29 and 30: 10 Additional notes 10.1 Interpreta
Page 31 and 32: 11 Accessories The following equipm
Page 33 and 34: 12 Contact and communication Please

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