The GM50 microphone disc is a very versatile successor of the FG-DT50 microphone from Avisoft Bioacoustics. With the built-in ultrasonic capsule Knowles FG-23629-P16, the integrated microphone heater and preamplifier as well as a 40kHz test signal speaker, it offers all the features of its bigger sister GM90 in terms of frequency response, directional characteristics, noise level, condensate avoidance and microphone sensitivity logging. In addition to installation in the floor of wind turbine nacelles, the removable mounting plate also allows a wide range of other installation options. When installed in the floor of wind turbine nacelles, the GM50 is characterized by the small required bore diameter of just 55mm (Drilling Plan - GM50). It should be noted, however, that due to the lack of a wind protection ring and the changed dimensions compared to the GM90, the GM50 microphone disc is not compatible with the software tool for calculating shutdown times Probat.
To protect against weather and environmental influences, all electronic components in the aluminum made microphone disc are splash-proof encapsulated. In addition, the Plus model is equipped with a microphone capsule protector, which significantly increases the lifetime of the microphone capsule.