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Visibility & Present Weather 5600-VPF730

Visibility & Present Weather 5600-VPF730



Measures Visibility & Present Weather 5600-VPF730 Combined with Proven Accuracy, Reliability, Repeatability


Only sensor with adjustable matrix for varying wind conditions. Very low power requirements. Minimal maintenance requirements & running costs. Measuring Range: 10m – 75,000m (33 ft – 47 miles)

  • Present Weather includes: all forms of liquid, freezing and frozen precipitation; e.g., rain, drizzle, snow, snow pellets, snow grains, ice pellets (formerly sleet) and hail, and those suspended particles that are classed as obstructions to vision; namely, mist, fog, haze, dust and smoke.
  • Measurement Principle The sensor calculates EXCO (the atmospheric EXtinction COefficient) by measuring the amount of light scattered by the particles in the sampling volume. From this EXCO value the MOR (Meteorological Optical Range) and thus visibility is determined.
  • Data Output The sensor is configured with RS-232C signal output as standard with RS-422 communication available as an option. The data is output in various ASCII data strings, such as a small compressed data string, expanded data string and remote maintenance data string amongst others. The unit can be set in either automatic or polled mode and data sent to a printer or to a PC for tagging, processing and archiving.
  • Maintenance, Calibration, Self-Test & Monitoring The sensor is fully calibrated at the time of manufacture. Routine maintenance, including a check on calibrations, can be performed easily in a matter of a few minutes and a re-calibration (although this should never be required) takes only slightly longer. The sensor condition and performance can be monitored remotely using the self-test and monitoring system detailed overleaf.
  • Optimum Design : Range is considered to provide the best correlation of EXtinction COefficient (EXCO) to observed visibility. In reduced visibility conditions, where other sensors report only precipitation, This Present Weather Sensors provides accurate visibility AND precipitation data.
  • Accuracy : The infrared diode light source is proven to provide higher accuracy, longer life and more consistent readings than sensors which use visible light sources.
  • Consistency in All Weather : Measurements are the best possible regardless of wind direction and precipitation conditions. Sensor does not suffer from turbulence effects or from precipitation splashing off the instrument enclosure.
  • Single lightweight unit easily be installed by one person.
  • Standard: Sensor head of high quality aluminium construction which is hard anodised to give a superior finish that does not require painting. RS-232C digital output Window de-misters Power line surge arrestors Signal line surge arrestors Self test and monitoring system 6 metre power and signal cable Waterproof mini-connectors Calibration reference certificate Manual


  • Measures
visibility and present weather
  • Output
  • Range
10 m to 75 km
  • Accuracy
± 2 %
  • Light-source used
  • Light- source wavelength
880 nm
  • *FSM angle used
  • Measurement geometry
  • Sample volume size (com3)
  • Power requirements – sensor head
2.0 W
  • – window heaters
2.5 W
  • – **PSU
N/ A
  • Hood heating option available
  • Hood heater power requirements
45 W
  • Suitable for mains, battery, solar power
  • Operating temperature range (oC)
-50 to +60
  • Weight: sensor head **PSU
7 kg –
  • Output rate (seconds)
10 to 300 (selectable)
  • Method of construction
salt-dip brazing
  • Materials
hard-anodised aluminium
  • Reliability
> 8 years (***MTBF)
  • Undisturbed sample volume
  • Detection threshold: snow, rain
0.0015 mm / hr, 0.015 mm / hr
  • Maximum rain rate
250 mm / hr