Transfer function of #40 does not change as sensor ages and endplay increases
NRG Maximum #40 Anemometer endplay is specified not to exceed .080 inches (2 mm). Typical values are around .030 inches (0.76 mm) for a new sensor. Endplay is necessary for proper function of the anemometer as it allows the sensor to start up and spin freely. It is normal for endplay to increase as the sensor is run over a period of time. The shaft and rulon bushing wear slightly which increases the endplay - this is normal. Please note that icing conditions may increase the endplay over a shorter period of time.
Endplay of around 0.125 inches (3.18 mm) would signal time to retire the sensor. It should take around 10 or more years of constant use in a non-icing environment to reach this level of endplay. In icing environments, it could reach this level in far less time. The transfer function of the NRG Maximum #40 Anemometer does not change over time even if the endplay increases. This is due to the properties of the rulon bushing and tight manufacturing processes.
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