The FAA-approved runway visual range (RVR) system utilizes measurements from the FS11 Visibility Sensor, the LM21 Background Luminance sensor, and the newly developed Runway Light Intensity Monitor (RLIM), which determines the intensity settings of the runway lights. This combined sensor system is integrated with a Data Processing Unit (DPU) and provides critical RVR information to support precision landing and takeoff operations in the National Airspace System (NAS)

Features and benefits:

• The only FAA-approved, PC-based RVR system for U.S. airports
• Compatible with CAT I, II or III airports
• Intelligent LRU design and diagnostics offers high MTBF and low MTTR
• Flexible and scalable to meet any airports’ configuration needs
• Low periodic maintenance requirements
• Conforms to all FAA RVR specifications and requirements
• May be co-located with an existing NG RVR system
• Multiple sensor interface alternatives such as modem, fiber optic or radio data links
• Part of Vaisala AviMet® technology platform

The PC-Based RVR System includes the following components:

The Vaisala Visibility Sensor FS11 provides accurate and reliable measurements in all weather conditions, using forward scatter measurements made with a near infrared LED light source. As a result of cooperation between the FAA and Vaisala, the FS11’s performance has been optimized for RVR applications. The FS11 incorporates extensive internal diagnostics and comes equipped with high-power heaters to prevent snow accumulation and dew formation, and also includes a proven window contamination compensation algorithm.

The Vaisala Ambient Light Sensor LM21 accurately measures total ambient light and raises background luminance measurement to a new level of reliability. It comes equipped with intelligent monitoring and contamination compensation features. Window, hood and electronic heaters ensure reliable measurements in all weather conditions.

The Runway Light Intensity Monitor (RLIM) is an essential part of the RVR system. It accurately measures and determines the current flowing through the runway edge and centerline light circuits. This information is used to determine the intensity settings of the runway lights. Each Vaisala RLIM unit can accept input from up to eight current sensors.

The Controller Display (CD) is designed to exceed FAA’s extensive human engineering requirements in a busy ATCT environment. The display is a touch screen design with easy user configuration and diagnostics tools. The displays report touchdown, midpoint and rollout zone RVR, and edge and centerline runway light step settings for up to three user-selected runways. LVAT limits for each zone can be selected from a touch screen menu.

The Data Processing Unit (DPU) accepts and integrates data from up to 30 Visibility Sensors, two Ambient Light Sensors, 10 Runway Light Intensity Monitors and supports hundreds of Controller Displays. The high reliability of the DPU is achieved by using redundant servergrade computers and mirrored data storage.

Vaisala is committed to maintaining the productivity of our customers' investment. We are engaged from the beginning of your investment planning through the life-cycle of the operations.

With our comprehensive range of services we can actively maintain and support your system, provide fast access to technical support and spare parts, and ensure that safety and high service standards are met.