400-SVS1 Sentry™ Visibility Sensor 
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The Model 400-SVS1 Sentry Visibility Sensor measures atmospheric visibility, also known as meteorological optical range (MOR) by determining the amount of light scattered by particles (smoke, dust, haze, fog, rain, and snow) in the air that passes through the optical sample volume. A 42-degree forward scatter angle is used to ensure performance over a wide range of particle sizes.
Performance in all weather conditions was a design prerequisite for the Sentry. An integrated, one-piece housing design keeps all cabling internal to the sensor for the ultimate protection against the elements. The sensor housing is made from anodized aluminum and the enclosures are rugged, UV-resistant fiberglass rated to IP66. Based on the proven experience of the NWS and FAA, the sensor uses a "look down" geometry to reduce window contamination and clogging from blowing snow. The windows use continuous duty anti-dew heaters and thermostatically controlled external hood heaters are offered for protection in extreme environments. All power and signal lines to the Sentry are protected with surge and EMI filtering to help guarantee uninterrupted service for the life of the sensor.
Installation and maintenance effort is minimal for the Sentry. A flange located on the bottom of the sensor signal processing box mates with a user supplied 1-1/2 inch IPS pipe. Power and signal connections are made through waterproof cable glands to terminal boards in the signal processing box. Cables are not included.
Calibration of the Sentry in the field is as simple as connecting a factory supplied calibration fixture and following a simple procedure that takes less than 30 minutes. Annual calibration is recommended.
Specifications
Performance
Range: 30 m to 16 km (other ranges available)
Accuracy: ± 10%
Time Constant: 60 sec
Scatter Angle: 42 deg nominal
Source: 880 nm LED
Power
AC Version: 100-240 Vac, 14 VA; 70 VA with hood heaters
DC Version: 10-36 Vdc, 6 VA; 18 VA with hood heaters
Environmental
Temperature: -40 to 60 °C
Humidity: 0-100%
Protection: IP66 (NEMA-4X)
Physical
Dimensions: 889 mm W x 292 mm H x 305 mm D (35" x 11.5" x 12")
Weight: 8 kg (18 lb)
Mounting: Nominal 40 mm pipe, 48.3 mm o.d. max (1-1/2" IPS pipe, 1.9" o.d. max)
Data Outputs
Analog Voltage: 0-10 Vdc standard, 0-5 Vdc optional
4-20 mA Current Loop: Single ended and isolated optionally available
Relays: Control and diagnostic optionally available
RS-232 Serial, ASCII Coded optional
Ordering Information
400-SVS1-x-y-H-P Sentry Visibility Sensor
Specify:
x = (A) 115 Vac, (C) 220 Vac, or (E) 12 Vdc
y = (1) 0-10 Vdc, (2) 0-5 Vdc, or (3) 0-3 Vdc
(H) hood heaters or (blank) no heaters
(P) 1" pipe flange or (blank) standard 1-1/2" size
400-SVS1-30003-A 4-20 mA Output Option PCB
400-SVS1-20004 Sentry Calibration Fixture
400-SVS1-70009 AC Power Cable 3C 18AWG 3M
400-SVS1-70011-xx DC Power Cable 2C 20AWG Shielded
Specify xx length of cable in meters
400-SVS1-70010-xx Signal Cable 1 Twisted Pair 22AWG Shielded
Specify xx length of cable in meters
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