Tensior T8 - Eijkelkamp Agrisearch Equipment
Tensior T8 - Eijkelkamp Agrisearch Equipment
Tensior T8 - Eijkelkamp Agrisearch Equipment
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6 Calibration<br />
Programmable potentiometers are integrated into the <strong>T8</strong>. They can be<br />
addressed via the two digital lines.<br />
Although the electronics is completely covered with epoxy resin, it is still<br />
possible to calibrate the sensor.<br />
The following parameters can be calibrated:<br />
• Pressure sensor: inclination and offset<br />
• Temperature sensor: offset<br />
• IR indicator: trigger level<br />
The <strong>T8</strong> Programming Unit KB<strong>T8</strong> is required to address the potentiometers<br />
and to check the inclination.<br />
6.1 Checking the offset<br />
There a two possible ways to check the offset:<br />
1. Put the filled <strong>T8</strong> into a beaker with water and immerse the cup for approx.<br />
3 to 4 cm. Wait for the value to stabilise. The measured signal must be<br />
between -5 hPa and +5 hPa (at room temperature). If air bubbles are inside<br />
the Tensiometer, the reading might take a while to reach this value.<br />
2. A more reliable method would be to screw of the cup. Then, shake the<br />
body to remove the water inside the pressure sensor. The pressure value<br />
must be in the range of -5 hPa to +5 hPa. Before screwing the cup on the<br />
<strong>T8</strong>-body, pressure sensor and cup must be refilled with degassed and deionised<br />
water (see chapter "Filling in the laboratory").<br />
Caution: The pressure sensor diaphragm inside the small boring on the<br />
pressure sensor body is very sensitive and may never be touched! It can be<br />
destroyed even by slightest contact!<br />
Also, no contamination should get on the sealing and gasket.<br />
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