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1. Introduction
The AeroX Light is a runway light intensity monitor (RLIM) designed specifically for Campbell
Scientific automated weather observing systems (AWOS) and runway visual range systems (RVR).
Runway light intensity measurements are critical to RVR, which is either highly recommended or
required for categorized runways. RVR provides users, such as pilots and air traffic controllers,
with information on runway visibility conditions during periods of low visibility weather due to
fog, rain, snow, or sandstorms.
This single-box solution monitors runway light intensity by measuring the current in the lighting
loop using clamp-on current transducers. Each current transducer outputs from 4 to 20 mA of
current proportional to the amount of current in the lighting loop.
Typically, each airport runway has both an edge and a center lighting loop. The lights can be LED
or incandescent. The LED lights typically use from 0 to 6.6 A and the incandescent lights use 0 to
20 A.
The AeroX Light monitors the current and sends the calibrated current data to Campbell Aero for
RVR calculations. The Campbell Aero polls the AeroX Light when the data is required.
The AeroX Light consists of an enclosure that houses a CR1000X data logger, AC power
protection devices, and a power supply (see
[p. 2]). Campbell Scientific offers power
options to handle voltages up to 260 VAC and provide battery backup.
AeroX Light
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