Air Handling Unit (AHU) is the most important part of environmental equipment used for growing mushrooms. Mushrooms are like humans, they consume O2 from air and produce CO2. We need to supply enough air to mushrooms to let them breathe as well as effectively remove CO2 away from them. Besides providing […]

To estimate the cost of expenses for environmental control in growing rooms the following must be considered: Inlet and exhaust fans Air ducts Air conditioning Water mixing valves Control and measuring instruments Humidity system Additionally it is necessary to take into account the costs for preparing a hot water (boiler), […]

In order to choose sensors correctly, it is necessary to understand for what measurements they are applied and how reliable is the result of measurement. First of all, the air and compost (substrate) temperature is meant when speaking about environmental measuring parameters. The main requirements to the temperature sensors used […]

When using resistance temperature detectors (RTDs) for temperature measurement, the additional error can be introduced by connection wires, as wires have their own resistance which depends on the ambient temperature. RTDs have two or three-wire configuration. RTDs are connected with copper wires as copper wires have a low resistivity. When two-wire […]

The main characteristic of measuring instruments is an error, i.e. a measurement result deviation from a true value. The maximum measuring error of glass thermometers corresponds to the value of scale division. Thermistors error depends on the type of thermistor. Semiconductor sensors error is 0.5 Celsius degrees, as a rule. […]

Our clients often ask: “I have located a few thermometers and temperature meters in the same room but they show different temperatures. Which devices or thermometers should we believe?“ In any room there exist certain temperature gradients, even without ventilation. Within two meters horizontal temperature gradient may be 2°C, but […]

For the measurement of relative humidity several types of sensors are widely available. They are Psychometers, Aspirat, Capacitive and Resistive Sensors. The basic requirements for Humidity Sensors used to maintain the climate in the mushroom growing production, are: measuring relative humidity range – from 10 to 100% accuracy – 1% […]

The psychrometric method of humidity calculation is based on the fact that the temperature difference between wet and dry thermometers depends on the air humidity. The humidity error consists of two components: temperature measurement error and humidity error after measuring the temperature. If you have a look at any psychrometric […]

Humidity measurement by a psychrometer will be correct if the temperatures of dry and wet thermometers are measured properly and air flow rate around the wet thermometer is calculated properly, too. Dry and wet thermometers are calibrated in the same way as other temperature sensors – by comparing their readings […]

CO2 concentration in the air of growing rooms is measured by sensors with a range from 0 to 5000 ppm (0 to 5%). The measurement error should not exceed 100 ppm. These requirements correspond to the sensors which operation is based on the use of infrared rays. In a factory their […]

Automation can reduce the amount of manual labor and improve the accuracy of control parameters. Automated environmental control is considered complete when the technologist programs the growth in the controller and all actuators operate automatically without human participation, from the time when the growing room is loaded with a substrate […]