Priva Groscale slab weighing system

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Description

Priva Groscale allows you to accurately follow the fluctuation in the slab weight and thus the amount of water present in the substrate slab. This will give you an insight into the amount of water absorbed by your plants in the course of the day. When the right software is installed on the process computer, […]

Priva Groscale allows you to accurately follow the fluctuation in the slab weight and thus the amount of water present in the substrate slab. This will give you an insight into the amount of water absorbed by your plants in the course of the day. When the right software is installed on the process computer, this will give you an extra set of tools to regulate and keep an eye on the water dosage, as well as to protect your plants from being deprived of water as a result of substrate slabs becoming too dry. You can avoid loss of production and even achieve an increase in production by simply reacting correctly to the amount of water present in the slabs.

The Groscale consists of two or four weighing platforms connected to a weighing indicator. The weighing platforms are fitted with a sensor which records the measured weight. The weighing indicator combines the signals of the weighing platforms and converts these into a total weight. Weight measurements are taken continually by the weighing indicator. The computer will allow you to request collective measurement values in a table and a diagram. For further information on viewing and using the measurement values, please refer to your process computer manuals.

The Groscale is developed with a view to highly accurate measurements of substrate slab weights. Therefore, the device is more accurate than is strictly necessary for the measurement of moisture content; this makes the system suitable for extension in the future, even if these extensions require a higher level of accuracy.

Installation of the Groscale

It is desirable to set up the Groscale at the location before the start of a new crop. However, it is possible to set up the weighing platforms in an existing situation.First and foremost, you need to determine the location where you want to take the weighings. This location should be a representative spot in the middle of the crop. When using an unit with four weighing platforms (2 x 2 weighing platforms), one unit should be placed on the left and the other on the right of the row of crops in the same section. This way an average value is obtained for the slab weight of plants on the sunny and the shadowy side of the row of crops are taken into account. This is because of differences in transpiration. With a V-system, the weighing platforms can be placed one after the other and the weighing indicator in the middle.

Weighing Platform

  • Accuracy: 0.05% Full Scale Minimum
  • Drift at Output signal: 10ppm of placed weight/degree C
  • Drift at zero point: 23 ppm of weight range/degree C

Load Cell interface

  • Number of load cells: 1-4
  • Load cell impedance: 415 Ohm +- 10%
  • Agitation voltage: 4.4 VAC
  • Input voltage range: -0.1-2.4 mV/V
  • Sensitivity: <0.1 uV/div, intern 0.01 v/div
  • Drift: <8 ppm/degree C

Analog Outputs

  • Output range: 0-5300 mV
  • Work area: 0-5000 mV
  • Resolution: 1 mV/LSB
  • Absolute accuracy: 0.5% Full Scale
  • Relative accuracy: 0.5 LSB
  • Output impedance: 500 Ohm

Power supply

  • DC: 2038 VDC
  • AC: 24 VAC+- 10%
  • Power consumption: < 4 W

Temperature range

  • Work area: 15-35 degree C
  • Work range: 0-50 degree C

 

Overal system performance

  • Measuring accuracy: 0.1% Full Scale, Minimal
  • Absolute accuracy data transfer (2 outputs): 4000 parts Full Scale
  • Relative accuracy data transfer (2 outputs): 50000 parts Full Scale
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