HMD60U/Y TransmittersU301en-1.1 Operating Manual1997-07-31 33. INSTALLATION3.1 Selecting the place of installationSelect a place that gives a true picture of the environment or process and is asclean as possible. Air should circulate freely around the sensor. A rapid airflow is recommended as it ensures the same temperature for the ambient airand the sensor head.Install the transmitter in a place where no cold or hot spot can develop. If thesensor head is installed in a duct or channel where the temperature is differentfrom the ambient temperature, insulate the point of entry. An uninsulatedinstallation might lead to condensation on the sensor head and even if nocondensation occurs, the resultant air flow may change the temperature nearthe sensor head and distort the readings.3.2 MountingMount the transmitter with two screws. Place the drilling template on the ductsurface and drill the holes as indicated. Remember to drill an additional holefor calibration purposes.Ø 12(0.47)250 (9.84)62 (2.44)100 (3.94)100 (3.94)Mounting hole 82 (3.23)>>>Mounting hole 82 (3.23)>>>Figure 3 Dimensions of the HMD60U/Y (in mm)