3.1.2 Wall MountingBefore mounting an HMT140 device, consider the environment. It is recommended thatwireless devices be mounted in an area with a minimum of wireless interference.• If you plan to install a device without an LCD in a dark or low-light area, a high-traffic area,or an area with a solid object situated within 10 cm (3.9 in) of the front of the device, youmay want to turn off the proximity sensor to avoid triggering unnecessary transmissions(see Modify Transmission Settings (page 28)).• To ensure consistent communications and data transfer to Vaisala viewLinc, limitinterference from solid structures or wireless/microwave radiation. For additionalguidance, please contact Vaisala.If mounting against a metal surface, be sure to keep a minimum of 2 mm (0.08 in)between the metal and the back of the HMT140 to ensure an uninterrupted radiosignal.1. Open the HMT140 cover.2. Make sure that the HMT140 is correctly aligned and attach it directly to the wall with up tofour screws (not included in the package).Select the size and type of the fastening screws according to the wall material (forexample, wood or stone). The diameter of the fastening screws is typically between 3.5and 4 mm (0.14 and 0.16 in). Refer to the Drilling Template in the HMT140 Quick Guide.HMT140 User Guide M211488EN-G20