Figure 23 Average Operational Current Consumption (with 4Hz Wind Sensor Sampling)
The input po
wer supply must be capable of delivering 60 mA (at 12 V) or 100 mA (at 6 V)
instant current spikes with duration of 30 ms. These are drawn by the wind sensor
(whenever enabled) at 4 Hz rate, which is the default value for wind sampling. Wind
sampling at 2 Hz and 1 Hz rate is also available.
Because wind measurement is the most consuming operation in the system, the average
current consumption decreases almost in proportion to the sampling rate.
Typically, the average consumption is less than 10 mA. The higher the voltage, the lower the
current.
Heating voltage Vh+ (one of the following three alternatives):
• 12 … 24 VDC (-10 % … + 30 %)
• 12 … 17 VAC
rms
(-10 % … +30 %)
The typical DC voltage ranges are:
• 12 VDC ± 20 % (max 1.1 A)
• 24 VDC ± 20 % (max 0.6 A)
Nominally at 15.7 V heating voltage level, the transmitters automatically change the heating
element combination to reduce instant current. The input resistance (R
in
) is radically
increased with voltages above 16 V as shown in the following graph. The average (5s) power
does not depend on the input voltage.
The recommended range for AC is:
WXT530 Series User Guide M211840EN-D
54
sales@streamlinemeasurement.co.uk
www.streamlinemeasurement.co.uk
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