Section 3
Mechanical & Electrical Installation
16
FT742-SM (RS422 & RS485) Sensors
– User Manual
Figure 4: Outline Dimensions, Assembly & Wind Direction Reference (Compass Disabled)
Figure 5: Sensor Base Dimensions
Figure 5 displays the location of the O-ring groove (FT O-ring part number FT029, manufacturer part number:
2-127 O-Ring EPDM 70 Shore). One O-ring is supplied with new sensors. The use of lubricant on the O-ring will
depend on the material selection. The breather hole allows the air pressure within the sensor to balance during
varying environmental conditions, it is important the breather hole is not sealed and mounting designs permit a
small amount of air movement around the breather hole.
