pH is one of the most important parameters in the plant nutrition. The absorption of nutrients by the plants is highly dependent on pH. For this reason, fast, easy and accurate pH measurements are essential in professional horticulture.
Electrical conductivity of an aqueous solution is directly related to the concentration of the dissolved salts. For plant nutrition control, it is essential to measure EC of process water and nutrient solution, especially in closed and hydroponic cultivation.
Activity measurement (salinity)
Salinity is determined by the concentration of total dissolved salts directly in the soil or substrate, taking into consideration the relevant soil properties, like soil moisture, temperature and soil compaction. These factors determine the quantity of salts being “active“ and available to the plants.
The measuring principle is based on the FDR measuring technology and is not affected by pH and salt content of the soil and substrates. Water content data (expressed in Vol %) allow immediate statement about the irrigation water requirements.
Soil temperature measurement
Temperature measurement is carried out in the range of -10°C to +50°C by a fast-reacting NTC sensor spattered in the probe tip.
Air temperature, humidity and air pressure measurement
The HPT probe enables simultaneous measurement of air temperature, humidity and air pressure. The integrated sensor technology is highly precise and has a very fast response time. Like all COMBI 5000 sensors, the air temperature and humidity sensor is automatically recognised by a special coding as soon as it is connected to the basic unit. The HPT sensor is especially important in greenhouse cultivation with ventilation and shading installations. The extension of the control possibilities of the growing conditions by measuring air temperature and humidity is a further step in the development of a fully comprehensive multifunctional control system in professional plant production.
Data logger function
The basic unit has an integrated data logger that records all measurements of the instrument. With the help of the data transmission cable, all data stored in the unit (parameters and measured values with date and time) can be transferred to PC. The data transfer protocol is displayed in .csv data format and can be easily transferred to an Excel file, for example.