Nowadays, almost all air conditioning, conveying or exhausting systems need flow monitoring. Gas flow monitors are required to have high reliability and minimal pressure loss and Kobold has on offer an optimal solution with the flow monitors of the KAL-L series.
The KAL-L works according to the calorimetric principle. The sensor is heated to a few degrees above the medium temperature, then, when the medium flows, the heat in the sensor is transferred to the medium, i.e. the sensor is cooled. This cooling process is a measure of the flow velocity and a second sensor measures the medium temperature. The compactly mounted electronics compares the resistance of both sensors by means of a Wheatstone bridge circuit, and switches an output relay if the actual value drops below the set switching value. In addition to the 2-colour LED indication, the current flow rate can also be read on an eight-digit LED bargraph. The adjustable switching range between 1-20 m/s fulfils the specifications of almost all systems. Other features include:
• Accuracy: 10% of reading.
• Pmax: 8 bar; tmax: 120°C.
• Relay output.
• No moving parts.
• Negligible pressure loss.
The installation by compression fitting or clamping flanges allows retrofitting into existing plants.
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