Campbell Scientific IRS21 Road Weather - Manual (Page 6)

IRS21 Lufft Intelligent Road Surface Sensor
2. Specifications
Dimensions: 5” in diameter, and 2” high
Weight: 2 pounds
Survival temperature: -57 ° to 158°F (-50° to 70°C)
Rated current: less than 200 ma
Interface: RS485
Standard cable length: 75 feet (25m)
Optional cable length: up to 300’ (100M)
Power supply: 9 to 14 Vdc
Operating temperature: -40 ° to 158°F (-40° to 70°C)
Operating relative humidity: 100%
Outputs
Road condition: dry, damp, wet, snow, freezing wetness, ice
Road temperature: -40 ° to 158°F (-40° to 70°C)
Accuracy ±0.2°C (-10° to 10°C);
±0.5°C (-40° to 70°C)
Resolution -.1 °C
Freezing point: -4 ° to 32°F (-20° to 0°C)
Accuracy ±.1°C
Resolution -.1 °C
Needed Accessories
RS485 to RS-232 adapter Lufft pn 8410.KON – Campbell part number 18080
SDM-SIO4
Warranty Exclusions
Due to important installation considerations, the following sensors will not be
warranted.
1. Sensors that aren’t installed flush with the road surface.
If the road sensor is installed above the road surface, damage to the sensor
could result from equipment contacting the sensor.
If the sensor is mounted below the road surface, incorrect measurements
are possible due to the pooling effect of material on top of the sensor that
is not representative of the road surface.
2. Sensors with exposed sensor cable in the road surface.
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