Published:
16 October 2014
Category:
Manufacturer News
Offering high performance and reliability the TWA astronomical twilight switches provide an ideal solution where the use of external sensors could be a problem.
The astronomical twilight switches TWA-1 and TWA-2 can provide energy savings of more than 30% thanks to the automatic control of lighting and other loads. These advanced twilight switches automatically control lighting circuits depending upon the time of sunrise and sunset, without requiring the use of an external daylight sensor.
Operating principle
The installation of an astronomical twilight switch in a system is a particularly useful addition for situations where light sources, or other environmental conditions, can cause changes in the brightness level and allow false readings and inaccuracy of traditional sensors. In these cases, the TWA-1 and TWA-2 astronomical switches can control the lighting system by internally calculating the sunrise and sunset times of the geographic zone where the system is installed. This is ideal in situations where high pollution environments can affect traditional sensors, or areas where vandalism of external sensors is seen to be a problem.
Example of Installation
Atmospheric pollution can cause dust deposits on the external probe of a traditional twilight switch that can compromise the operation of the device. These deposits prevent the probe from measuring the correct ambient light levels and therefore reducing energy efficiency through false automatic control of external lighting. In addition, the prolonged exposure of probes to sunlight can reduce their effectiveness and life. These problems are resolved by installing a TWA-1 astronomical twilight switch that controls the lighting system according to the level of light calculated from the preset longitude and latitude parameters.
Application environments
The installation of the TWA-1 and TWA-2 astronomical twilight switches is particularly suitable for applications where the operation of a traditional twilight switch with external probe can be falsified or compromised by an external cause (such as environmental pollution, overexposure to light, vandalism, etc.).
