SWS Test Plaque

For wind turbines using visibility controlled aviation obstruction lights. Simulates a fixed visibility allowing function of all connected equipment to be tested.
SWS Test Plaque
Home / Products / SWS Test Plaque


There is a requirement to be able to test the correct operation of aviation obstruction lights on wind turbines, both at the initial construction phase and at regular intervals thereafter as part of general operational maintenance. This SWS test plaque demonstrates the correct operation of the aviation obstruction lights by reproducing the required visibility from the Biral sensor, triggering the change of brightness.

The SWS test plaque is supplied to a customer specified, pre-configured visibility value. These test plaques can be fitted to any Biral SWS sensor and utilise the mounting points used by the calibration plaques.

Each test plaque forces the Biral visibility sensor to report a known Meteorological Optical Range (MOR) as ascribed to each plaque. This MOR value is equivalent to a known visibility value. This MOR output will then cause the lighting control system to adjust the brightness of the aviation obstruction lights.

The MOR value for each test plaque is specified by the customer at the time of purchase. The MOR range available is 0.5 to 7.0km in increments of 0.1km.

These test plaques are for use as a simulator only and are not to be used for the calibration of Biral sensors.


MOR range available
0.5 to 7.0km in increments of 0.1km
Measurement Error
± 15% of assigned MOR value
Anodised aluminium optical support and installation arm
0.32kg. Including carry case 1.02kg
2 years
The plaque is packaged in a rigid plastic foam lined protective carry case. Includes a set of foam zero reference optical plugs. - User guide


Sales & Support

Contact Biral for more information

To find out more about this instrument or to discuss your application requirements please do not hesitate to contact Biral.

After Sales Support

Biral offers free advice and technical support for the lifetime of the instruments we sell. Once you have purchased the unit you can always contact us for help using the links on our Service Support page.

Enquire about this product

"*" indicates required fields

Drop files here or
Max. file size: 8 MB.