Visibility meter VPF-710

The VPF-710 Visibility sensor provides high quality visibility measurement in a compact and highly robust package.

• Reliable measurement in all weather conditions
• Highly corrosion resistant hard coat anodised finish
• Window contamination monitoring and compensation
• Unaffected by obstacle warning lights
• Easy integration of Biral ALS-2 Ambient Light Sensor
• Mains or DC powered
• 10m to 75Km measurement range

Features:

Measure visibility and fog density

High precision, reliability, and repeatability that have been tested for a long time

Self checking and monitoring system

low power consumption

Long term trouble free operation

Ultra low operating and maintenance costs

The VPF-710 digital visibility sensor has been used for precise measurement of visibility for over 20 years. It is compact, sturdy, and has been tested for long-term operation, making it suitable for operation in extremely harsh environments.

Measuring principle

VPF-710 utilizes forward scattering technology to measure visibility 24/7. The sensor calculates the EXCO atmospheric extinction coefficient by measuring small suspended particles (fog, mist, smoke) and large particles (rain, snow, ice particles, drizzle), and then derives the MOR meteorological optical vision and visibility from EXCO.

data output

The sensor uses RS232C as the standard signal output, and the data output is in the form of ASCII characters. The sensor can be set to automatic data output or polling output mode, and the data can be transmitted to the computer in compressed or expanded form.

Maintenance, calibration, and automatic detection

The sensor has undergone comprehensive calibration before leaving the factory. During normal maintenance, only one person needs to calibrate and check the sensor within a few minutes. The working status of the sensor is obtained through automatic detection function.

Sensors include:

High quality aluminum structure probe body, no need to use paint

RS-232C digital output

● Sensor defogger

● Power cable surge protector

● Signal cable surge protector

● Self checking and monitoring system

6-meter power and signal cables

Waterproof mini connector

Calibration certificate

● User manual

Optional options:

RS-422 Communication - A 12 meter long RS-422 communication cable can be used between sensors and control computers.

Heating version - The sensor contains a window defogger, which allows the sensor to be used in environments below -3 ℃. However, when the temperature at the measurement location needs to remain below -3 ℃ for several hours every day, a heated version of the sensor should be used, so that it can be used in an environment of -50 ℃ without any errors.

● Environmental light sensor - designed for airport RCR (aircraft ramp runway line of sight) system based on ICAO measurement of environmental light.

Meteorological Station - Provides 3 analog inputs (0-10V), uses VPE-710 as the meteorological station, and outputs a single time-dependent data string.

Attachment options:

Calibration Tool - Recommended for end-users to recalibrate and check the reliability coefficient of sensors. The tool includes a future transport box, zero plug, a calibration disk, and a special EXCO value. One set of tools can accommodate multiple sensors with the same measurement range.

Stainless steel installation bracket - including U-bolts, fasteners, and adjustable installation tools, ensuring that the sensor can be installed on any bracket within the diameter range of 45-75mm.

● Transport case - contains 3 inches of foam protective material to ensure that the sensor can be fixed in place. Self checking and monitoring system.

By using self checking software, remote monitoring of the sensor's condition and performance can be achieved through visual inspection, which can monitor:

● Light source power supply Light source power consumption

● Pollution status of transmission window

● Non volatile memory total check

● EPROM total quantity check

● Restart status

Verification of sensor sampling interruption

RAM read/write verification

● Registration read/write verification

A/D control signal testing

Accuracy check of A/D conversion

● Forward scattering background illumination condition

Advanced Self Testing and Monitoring System

In addition to the above monitoring items, users can also monitor:

● Sensitivity of forward scattering receiver

Forward scattering receiver window pollutants

● Power supply supports voltage supply voltage

● Input voltage check (battery check - only DC power sensor)