Geoves

Description

MAIN FEATURES 

The dry bulb and wet bulb thermometers consist of 2 precision transducers, one with the thermistor in the air and one with the thermistor wet by a special gauze partially immersed in a container of distilled water.

Both thermistors are ventilated by an air intake fan and are interfaced by a microprocessor for measuring management. The two dry and wet bulbs are mounted inside special protection screens from solar radiation, made of aluminium and treated with special radiant white paints that guarantee easy cleaning and maintenance of the white colour over time.

The shields are in turn protected by the sensor support which acts as a cover for the shields, preventing snow and other depositions  from above: in this way shields remain cleaner and whiter, avoiding blackening that causes alterations in the measurement of temperature.

WORKING PRINCIPLE

Both temperature sensors are made with a Platinum resistance thermometer (Pt 100Ω @ 0 ° C). The change in resistance of the Pt100 is transformed into a linear current signal with temperature.

The wet bulb temperature is the temperature to which the water is brought in conditions of equilibrium of convective exchange and mass of air in fully developed turbulent motion. To correctly calculate the wet bulb temperature measurement, the transducer is wrapped with a gauze soaked in water and invested by a continuous flow of air.

The absolute humidity of a room can be obtained from the wet bulb temperature value. The instrument that uses the two dry bulb and wet bulb thermometers is commonly called a psychrometer.

ADVANTAGES

• 4-20mA outputs easy to connect to PLCs and dataloggers
• High reliability
• Good precision
• Long life