Summary of the 3 HSS models

Summary of each model

VF-500 Visibility Sensor is commonly used to automatically switch an external piece of equipment such as a fog horn at a specific visibility you define (eg 1 mile).  The sensor features user-defineable time delays which allow you to set the sensor so that the reduced visibility needs to be present for at least X minutes before the external piece of equipment is powered and conversely X minutes before the equipment is powered down after the visibility has improved above the set range.

This feature can prevent false alarms from occurring. For example the time delay can be set for 5 minutes, so that the reduction to visibility occurrence would need to be measured for 5 minutes continuously and therefore would not be triggered falsely from a passing ship's exhaust fumes.

This sensor is frequently used on lighthouses for fog horn switching and other similar applications where automatic switching of an external source is required, such as for road speed reduction signs.

The signal is available in 0-10 VDC voltage or 4-20 mA current analogue output and can be powered by mains or DC power supplies.

..... more about the VF-500

VPF-710 Visibility Sensor is used for applications where a digital signal is desired and is available in RS-232 or RS-422 format and the data output is available in various ASCII data strings, such as a small compressed data string, expanded data string, remote maintenance data string, etc. The unit can be set-up in either automatic or polled mode depending on your requirements.

The VPF-710 is usually used when the information from the sensor is sent to a logger or computer for the user to take action according to the data received.

.... more about the VPF-710

VPF-730 combined Visibility and Present Weather Sensor is one of a kind, being the only sensor using forward scatter meter technology to measure both visibility and precipitation data without external sensor input. This unit is a refinement of 2 decades of experience and technology and allows a compact, rugged instrument with excellent performance. The data signal is available in RS-232 or RS-422 format and provides the same data strings as the VPF-710 but includes precipitation strings as well.

.... more about the VPF-730

For present weather measurements without visibility please see Disdrometers

Visibly Better

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