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HSS VPF-710 Visibility Sensor |
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MORE ABOUT THE VPF-710
The VPF-710 sensor uses forward scatter meter technology to measure visibility in all weather conditions. The sensor measures the amount of light scattered by small suspended particulates (i.e. fog, haze and smoke aerosols) or larger particles (i.e. rain, snow, ice pellets, drizzle and mist) passing through the sample volume. The sensor calculates the atmosphere EXtinction COefficient (EXCO) from which the Meteorological Optical Range (MOR) is calculated. Using an infra-red light source and intelligent sensing technology the measurements are unaffected by other light-sources. The sensor is configured with RS-232C signal output as standard with RS-422 communications available as an option. The data is output in various ASCII data strings, such as a small compressed data string, expanded data string and monitoring 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. Please see the linked data example (pdf - link opens in a new window) The HSS VPF-710 is a single lightweight unit and can easily be installed by one person. The sensor is constructed of dip brazed high grade aluminium. All components that are exposed to weather are hard-coat anodised for protection against corrosion. Maintenance and calibration The sensor is fully calibrated at the time of manufacture. Routine maintenance, including a check on calibrations, can be performed easily by one person 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 below. Operation in temperature extremes The sensor operates in temperatures ranging from - 58º F to + 140º F. For operation below - 27º F the heated version is recommended (please refer to the heated option below). The VPF-710 System The sensor is constructed of high quality aluminium which is hard anodised to give a superior finish that lasts for years and does not require painting. As standard the sensor has:
Self-test and monitoring system The sensor condition and performance can be monitored remotely using the self-test diagnostic software which comes as standard to monitor:
Even greater self-test and monitoring is available with the optional advanced self-test and monitoring system (see below under variations) In addition the following variations are available:
Alternative Variants / Options Heated version - the sensor is fitted with window de-misters allowing operation of the sensor in temperatures down to 27º F. However, where the temperature drops below 27º F for more than a couple of hours a day the heated version is recommended. This version will provide error free operation in conditions down to - 58º F.The operational range of the sensor is from - 58º F to + 140º F. The heated version is available for all mains powered units (any voltage between 100-250 VAC) and 24 VDC battery powered units. However, please note that there is a restriction on heaters for 12 VDC units. A low power heater can be provided but it will operate at half of the standard rating (standard heater output = 15 W per hood and reduced heater output = 7 W per hood). The reduced heating units can be controlled by three methods: 1. ON all of the time...power hungry but effective. 2. OFF all of the time...conserve power but may ice up if snow accumulates. 3. Switched on and off situation depending on the temperature settings monitored internally by the sensor (best use of power and error free measurements). RS-422 communications - where there is 39 ft or more between the sensor and control computer RS-422 configuration is required. Ambient light sensor - allows ambient light conditions to be measured according to ICAO (4 level and with specific angle of view). Designed for use with RVR (Runway Visual Range) systems on airfields and for use with Allard’s Law if night time visibility conditions are to be determined according to this instead of using the standard Meteorological Optical Range values (MOR). Weather station module - provides 3 analogue inputs (0-10 V) allowing the VPF-710 to be used as a weather station. Output is a single time correlated data string. Advanced self-test and monitoring system - provides increased levels of diagnostic testing which in addition to the functions of the standard self-test and monitoring will also allow you to monitor:
For accessories see below
Calibration reference kit - recommended for end-user confidence checks and recalibration. The kit contains a carrying case, zero plugs and a calibration plaque to a specific EXCO value. One kit can be used on any number of sensors of the same range. Stainless steel mounting kit - includes a U-bolt and fasteners to secure the sensor to any pole with a diameter between 1.5 - 2.5 inch. Transit case - scientific case lined with 3 inch foam to hold the sensor securely in place in extreme handling conditions. This unit is usually dispatched within 2-4 weeks ARO (After Receipt of Order) Warranty The VPF-710 Visibility Sensor comes with 2 years warranty as standard. After Sales Support Biral offers free advice and technical support for the lifetime of the instruments we sell. Once you have purchased the unit you can always contact us for help if required at wwwmetsuppport@biral.com or by telephone.
This range is in continuous development therefore specifications may change without prior notice. E&OE.
Visibly Better |
See also:
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