Visibility Sensor and Present Weather Sensor Comparison Tables

. . . showing key differences between the HSS visibility and present weather sensors and the SWS present weather sensors

Application Suitability

	HSS Range	SWS Range
suitable for highway and tunnel use	yes	yes
suitable for wind energy use	yes	yes
suitable for general meteorological use	yes	yes
suitable for airport use	yes
suitable for marine and offshore use	yes
suitable for micro-meteorology use (research)	yes

	HSS Range	New SWS Range
models in range	3 (VF-500, VPF-710 and VPF-730)	2 (SWS-100 and SWS200)
measurement ranges	3 m -300 km (VF-500) 10 m - 75 km (VPF-700s)	< 10 m - 2 km (SWS-100) < 10 m - 20 km (SWS200)
measures present weather	over 20 types*	4 types
digital and analogue outputs	either or	both
EXCO outputs	yes	-
drop size distributions	yes*	-
precipitation accumulation outputs	yes with user selectable time frame*	yes with fixed 24 hour time frame
switching relays	up to 2 user configurable relays*	3 relays
optional analogue inputs	yes*	-
optional ambient light sensor	yes*	-
highly corrosion resistant	yes	-
hazardous Zone I and II convertible	yes	-
accuracy and durability	market leading accuracy and durability	industry standard

* optional extra or certain models only

Other Benefits

	HSS Range	SWS Range
measures visibility (in km)	yes	yes
RS232 or RS422 output	yes	yes
window heaters	yes	yes
optional sensor heating	yes	yes
low power requirements	yes	yes
no servicing required	yes	yes
no spare parts required	yes	yes
negligible maintenance	yes	yes
DC (battery) or AC (mains) powered	yes	DC (optional mains adapter box)

Specifications subject to change E. & O. E

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