The proper combination of temperature, humidity, CO2 and grow light in your greenhouse determines the health and vitality of your crop. In addition, a proper balance helps to prevent the occurrence of pests and diseases.
The aspirator box contains sensors that measure the temperature and air humidity. This is done by means of the dry-wet bulb principle or with an electronic measurement. These measurements are important, because all controls for heating, ventilation, screens, etc. are based on these measurements.
The plastic housing protects the sensors from water, dust and direct solar radiation. The aspirator box is equipped with an integrated fan and air filter. The fan sucks in the greenhouse air, filters it and runs it along the sensors. The fan is made of plastic to avoid corrosion problems in humid situations. The filter holder protects against water intake at the bottom, which could cause the filter to become saturated.
Optionally an electronic relative humidity (RH) sensor and CO2 sensor can be installed in the aspirator box.
Dry-wet bulb RH and temperature sensor
The RH of the greenhouse air is an important climate factor for the crop. The standard aspirator box measures temperature and RH in the greenhouse by means of a dry and wet bulb sensor. The dry-wet bulb aspirator box works with two temperature sensors and is relatively simple and reliable. Humidity can be measured from both measurements. For purposes of the wet bulb principle, the aspirator box is equipped with a water reservoir.
Electronic RH and temperature sensor
The electronic RH sensor is an alternative for the dry-wet bulb principle and requires less maintenance. The electronic RH sensor can be used both inside and outside the greenhouse. This makes the sensor applicable in places that are difficult to reach, for example above a screen, which allows you to regulate the greenhouse climate even better.
Optionally a CO2 sensor can be installed in the aspirator box. Next to grow light, humidity and temperature, CO2 is the most important growth factor for your crop. The right CO2 concentration in the greenhouse air is important because too high a value can damage the crop. Good measurement of the CO2 concentration is therefore essential. Depending on the measured CO2 concentration the proper dosage of CO2 can be determined, in combination with solar radiation or artificial lighting.