Sentry Visibility Sensor
The YOUNG Sentry™ Visibility Sensor measures atmospheric visibility (meteorological optical range) by determining the amount of light scattered by particles in the air (smoke, dust, haze, fog, rain, & snow).
Performance in all weather conditions is achieved with an integrated sensor design that keeps all sensor cabling internal to the sensor for complete protection from the elements. The sensor is made from anodized aluminum and rugged, UV-resistant fiberglass enclosures. Based on the proven field experience of the NWS and FAA, the sensor uses a “look down” geometry to reduce window contamination and clogging from blowing snow. The optical windows have continuous duty anti-dew heaters. Optional thermostatically controlled external hood heaters are available for additional protection in extreme environments. All power and signal lines to the Sentry™ are protected with surge and EMI filtering to ensure uninterrupted service for the life of the sensor.
Installation and maintenance are simple with the Sentry™. A sturdy mounting flange located on the bottom of the main enclosure mates with a user supplied 1-1/2 inch IPS mounting pipe. Power and signal cables are installed through waterproof cable glands on the bottom of the main enclosure to terminal boards for simple but reliable connections.
Calibration of the Sentry™ in the field is as simple as attaching a factory supplied calibration fixture and following a procedure that takes less than 30 minutes.
Visibiliity Range: 30 m–16 km
Accuracy: +/- 10% RMSE
Time Constant: 60 sec
Scatter Angle: 42 deg nominal
4-20 mA Isolated
RS-232, RS-422 or RS-485
10-36 VDC, 6 VA Nominal
18 VA w/ hood heating
Operating Temperature: -40 to +60 C
Humidity: 0 to 100% RH
Protection: IP66 (NEMA-4X)
Weight: 8 kg (18lb)
889 mm x 292 mm x 305 mm
35″ x 11.5″ x 12″
Mounting: 48 mm (1.9 inch) diameter (standard 1.5 inch IPS pipe)
Optional: 34 mm (1.3 inch) diameter (standard 1 inch IPS pipe)
Construction: Frame: Anodized Aluminum Enclosures: Fiberglass, UV Resistant
EMC Directive 2014/30/EU
RoHS Directive 2011/65/EU