You can specify the transfer function between measured values and output analog values. You can select the analog output type as well as the gain and offset used in the transfer function.
| Aout1 selected option | Scaling/Gain | Offset | Error indication | Example | |
|---|---|---|---|---|---|
| Voltage | 0.1 V/m/s | 0 V | 10 V |
0 V = 0 m/s 7.5 V = 75 m/s |
|
| Current 0 ... 20 mA | 0.0002 A/m/s | 0 A | 0.022 A |
0 mA = 0 m/s 15 mA = 75 m/s |
|
| Current 4 ... 20 mA | WMT701 | 0.00040000 A/m/s | 0.004 A | 0.002 A |
4 mA = 0 m/s 20 mA = 40 m/s |
| WMT702 | 0.00024615 A/m/s | 0.004 A | 0.002 A |
4 mA = 0 m/s 20 mA = 65 m/s |
|
| WMT703 | 0.00021333 A/m/s | 0.004 A | 0.002 A |
4 mA = 0 m/s 20 mA = 75 m/s |
|
| WMT704 | 0.00017777777 A/m/s | 0.004 A | 0.002 A |
4 mA = 0 m/s 20 mA = 90 m/s |
|
| Frequency push-pull | 10 Hz/m/s | 0 Hz | 1000 Hz |
0 Hz = 0 m/s 750 Hz = 75 m/s |
|
| WS425 - voltage |
8 mV/mph (0.017895 V/m/s) |
0 mph | 2 V |
0 mV = 0 mph 1.344 V = 168 mph |
|
| WS425 - frequency |
5 Hz/mph (11.185 Hz/m/s) |
0 mph | 1000 Hz |
0 Hz = 0 mph 840 Hz = 168 mph |
|
| Frequency push (PNP) | 10 Hz/m/s | 0 Hz | 1000 Hz |
0 Hz = 0 m/s 750 Hz = 75 m/s |
|
| Frequency pull (NPN) | 10 Hz/m/s | 0 Hz | 1000 Hz |
0 Hz = 0 m/s 750 Hz = 75 m/s |
|
| Aout2 selected option | Scaling/Gain | Offset | Error indication | Example |
|---|---|---|---|---|
| Voltage | 0.02 V/° | 0 V | 10 V |
0 V = 0° 7.2 V = 360° |
| Current 0 … 20 mA | 0.00005 A/° | 0 A | 0.022 A |
0 mA = 0° 18 mA = 360° |
| Current 4 … 20 mA | 0.000044444 A/° | 0.004 A | 0.002 A |
4 mA = 0° 20 mA = 360° |
| Potentiometer (WS425) |
1/359*Vref /° (0.0027855) |
0 |
Vref (1) |
0 V = 0° Vref = 359° |
For a different scaling, change the gain and offset settings.
| The scaling of the current output 4 … 20 mA depends on the sensor measurement range (WMT701, WMT702, WMT703, or WMT704), while the 0 … 20 mA output has 0.2 mA/m/s scaling for all the measurement ranges. |
The following tables list the most common settings for different units.
| Output signal | Scaling/Units | Setting for gain | Setting for offset |
|---|---|---|---|
| Voltage |
8 mV/mph 100 mV/m/s |
0.017895 0.1 |
0 0 |
| Current | 0.2 mA/m/s | 0.0002 | 0 |
| Frequency |
5 Hz/mph 10 Hz/m/s |
11.185 10 |
0 |
| WS425 - voltage | 8 mV/mph | 0.017895 | 0 |
| WS425 - frequency | 5 Hz/mph | 11.185 | 0 |
| Output signal | Scaling/Units | Setting for gain | Setting for offset |
|---|---|---|---|
| Voltage |
4 mV/° 20 mV/° |
0.004 0.02 |
0 0 |
| Current | 50 uA/degree | 0.00005 | 0 |
| Potentiometer | 359° = Aout ref | 0.0027855 | 0 |
You can configure output scaling or transfer function settings in a variety of ways by changing the custom gain and offset. The basic measurement units are m/s and degrees. The physical output units are V, A, and Hz. For the potentiometer, an output of 1 means 100% of the Aout ref voltage.
The following formula illustrates the impact of gain and offset values on the produced output:
o = y0 + k×s| Value | Definition |
|---|---|
| o | Produced analog output (V, A, Hz, 100%) |
| s | Measured wind speed or direction (in m/s or °) |
| k | Selected gain value |
| y0 | Selected offset value |
Example
- Output mode: voltage
- Offset: 0.0
- Gain: 0.1
With the above settings, the analog output voltage range is from 0 V (0 m/s) to 7.5 V (75 m/s). When the measured wind speed is 10 m/s, the output voltage is 1.0 V.
Output = 0.0 + 10 × 0.1 = 1.0
VExample
- Output mode: current
- Offset: 0.004
- Gain: 0.0002
With the above settings, the analog output current range is 4 mA (0 m/s) ... 19 mA (75 m/s). When the measured wind speed is 10 m/s, the output current is 6 mA.
Output = 0.004 + 10 × 0.0002 = 6.0
mA