NRG Product Manual
Hybrid XT Anemometer
HybridXT_Anemometer_Manual
Rev. 15
[email protected] | Page 7
02 January 2020
Frequency/Push-Pull Output | HXT Anemometer Models #4718 | #7901 | #9387
This output type provides a square wave output signal with a frequency proportional to the head
rotation rate (wind speed). The square wave amplitude is determined by the power supply voltage.
The anemometer output signal can be timed on either the rising or the falling edges. For best accuracy,
time and count many cycles then divide the count by the time for an average frequency. This technique
also effectively filters out short-term wind speed variations.
4-20 mA Output | HXT Anemometer Models #5763 | #9365
The HXT 4-20 mA Turbine Control Anemometer provides an industry standard 4 to 20 mA output signal
sourced by the sensor. The output range of 4 to 20 mA corresponds to a specific wind speed range,
depending on the model of anemometer.
Under normal operation, the output signal current varies from 4 to 20 mA. A signal outside this range
indicates a fault condition. The most likely causes would be a loss of power, a wiring problem, or a failed
sensor.
The HXT 4-20 mA signal output has been engineered to adapt to most common 4-20 mA current loop
inputs. The range of compatible loads for the current loop signal does depend on the power supply
voltage provided to the sensor. At the lowest specified power supply voltage of 11 V DC, the output loop
load (or “burden”) may be 350 Ohms maximum (a 7 volt maximum voltage drop). When provided with
its maximum 24 V DC power supply voltage, the sensor can drive up to a 1000 Ohm loop load (a 20 V
maximum voltage drop).
Power Supply Common
Power Supply Voltage
Anemometer Output Waveform
Output frequency proportional to wind speed
