Calorimetric flow monitor RLSW5

for air230VACIP67

The air flow monitor is placed in the exhaust air flow of a cooker bonnet behind the grease filter and monitors whether the exhaust air really flows at the required and adjustable speed. If this is the case, a potential-free changeover relay is switched, which releases the gas supply for gastronomic gas hobs by means of a gas solenoid shut-off valve. The airflow monitor is the basis for the so-called "mutual interlocking of exhaust air and gas supply". Possible applications Use in gastronomy for mutual interlocking of the gas supply for ovens in combination with ventilation systems as well as extractor bonnets DESCRIPTION This flow monitor operates according to the calorimetric principle and monitors air flows for exceeding or falling below a previously set threshold value. In the calorimetric measuring principle, a temperature-sensitive resistor is heated. The heating process is carried out by a separate heating resistor. A flow in the medium carries heat away from the measuring resistor, the temperature of the resistor changes and thus also its resistance value. This change is evaluated. However, not only the velocity of the flowing medium but also its temperature has an influence on the amount of heat dissipated, so a relation between flow and temperature must be established. This is done via a second temperature-dependent measuring resistor near the first. The second measuring resistor (temperature compensation) is not heated and is used for temperature measurement. Air flow monitor - solenoid shut-off valve (gas) - key switch. This control unit provides for the mutual interlocking of an exhaust air system and the gas supply for the oven in the catering industry