5.7.1 Testing Operation
Optional verifier (WMT70VERIFIER)
WMT700 measures the time it takes for an ultrasonic signal to travel from one transducer to
another. Therefore, the accuracy of the sensor depends on the distance between the
transducers and the
time-of-flight measurement circuit, which uses a crystal oscillator for its
time reference.
If necessary, you can verify the distance between the transducer arms with an optional
verifier. You can order the verifier from Vaisala as an accessory.
Vaisala recommends that you test the proper operation once a year or if you suspect that
the transducers may have been damaged. You can perform the test either in the field or in a
laboratory.
Do not perform the test when the wind speed is more than 10 m/s (22 mph) or when there
is a risk of thunderstorm in the area.
Some random data samples may be lost during the verifier test. This does not indicate
that sensor or instrument is faulty.
The verifier cannot be used to test the accuracy of wind direction measurement.
Chapter 5 – Maintenance
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