AMBIENT LIGHT SENSOR0 pages

ALS-2 AMBIENT LIGHT SENSOR
ALS-2 Ambient Light Sensor
Measures Background Luminance in accordance
with FAA and ICAO guidelines for use in Runway
Visual Range (RVR) applications
… direct connection to Biral visibility and present weather
sensors and field calibration simplify system design and
reduce maintenance costs

Designed to FAA and ICAO requirements

2 to 40,000 Cdm-2 measurement range

Choice of serial digital or analogue outputs

Simple and quick in field calibration

Direct connection to Biral visibility and PW sensors

Extensive self-test capabilities

-60°C to 70°C operating range

Designed to comply with specifications and
guidelines produced by ICAO, WMO and the
Federal Aviation Authority in the USA, the ALS-2
meets all the requirements for use in typical RVR
systems. The ability to connect the sensor
directly to a Biral visibility or present weather
sensor and have the background luminance data
incorporated into the visibility sensors data
string simplifies system design and construction.
Available with a choice of serial data or analogue
outputs the ALS-2 can be used to replace a wide
range of background luminance meters in both

legacy and new installations. The simple pole
mounting system even incorporates an angular
scale to ease installation.
A unique feature of the ALS-2 is its ability to be
calibrated in the field without the need to
disconnect the cable or send commands via the
software interface. The ALS-2 Field Calibrator
accessory simply fits over the hood and
communicates with the sensor using an IR link
through the optical window. The calibration can
be checked and adjusted in a matter of minutes
without the need for specialist staff or laboratory
equipment.
Designed to operate in the harshest of weather
the ALS-2 has window heating and window
contamination adjustment as standard. Extensive
self-test capabilities and optional heating
complete the package.
Biral have been manufacturing and supplying worldwide
high specification Visibility and Present Weather Sensors
since 1997.

tel: +44(0)1275 847787

www.biral.com

DOC101265.01A

The ALS-2 Ambient Light Sensor is designed to
measure background luminance as part of a of
Runway Visual Range system. Mounted
alongside the runway the ambient light sensor
is often deployed with a visibility meter to
provide the data necessary for calculation of
RVR.

email: met@biral.com