PyroMini IR Temperature Sensor Accessories Adjustable mounting brackets and air purge collars. The adjustable mounting bracket consists of a fixed mounting bracket plus another L- shaped bracket. When assembled as shown the adjustable mounting bracket offers a rigid support for the sensor and allows fine adjustment in two planes. Air purge collars are used to keep dust, fumes, moisture and other contaminants away from the lens. Air flows into the fitting on the side and out of the aperture at the front.