Campbell Scientific IRS21 User Manual
IRS21 Lufft Intelligent
Road Surface Sensor
Revision: 2/09
Copyright © 2005-2009
Campbell Scientific, Inc.
Warranty and Assistance
The IRS21 LUFFT INTELLIGENT ROAD SURFACE SENSOR is
warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in
materials and workmanship under normal use and service for twelve (12)
months from date of shipment unless specified otherwise. Batteries have no
warranty. CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is
limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option)
defective products. The customer shall assume all costs of removing,
reinstalling, and shipping defective products to CAMPBELL SCIENTIFIC,
INC. CAMPBELL SCIENTIFIC, INC. will return such products by surface
carrier prepaid. This warranty shall not apply to any CAMPBELL
SCIENTIFIC, INC. products which have been subjected to modification,
misuse, neglect, accidents of nature, or shipping damage. This warranty is in
lieu of all other warranties, expressed or implied, including warranties of
merchantability or fitness for a particular purpose. CAMPBELL SCIENTIFIC,
INC. is not liable for special, indirect, incidental, or consequential damages.
Products may not be returned without prior authorization. The following
contact information is for US and International customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company
serves your country. To obtain a Returned Materials Authorization (RMA),
contact CAMPBELL SCIENTIFIC, INC., phone (435) 753-2342. After an
applications engineer determines the nature of the problem, an RMA number
will be issued. Please write this number clearly on the outside of the shipping
container. CAMPBELL SCIENTIFIC's shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
CAMPBELL SCIENTIFIC, INC. does not accept collect calls.
IRS21 Table of Contents
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1. Function........................................................................1
2. Specifications ..............................................................2
3. Installation.................................................................... 4
4. Connections...............................................................16
5. Operation....................................................................17
6. Programming .............................................................18
6.1 CR1000 Program....................................................................................18
6.2 CR10X Program.....................................................................................20
Figures
1-1. IRS21.......................................................................................................1
3-1. Core cut for the road sensor ....................................................................4
3-2. Core drill and saw cutting equipment......................................................5
3-3. Saw cut is masked to control the epoxies................................................6
3-4. View of fast steel.....................................................................................7
3-5. Weights are placed onto the leveling fixtures for the road sensor...........8
3-6. First pour of Fabick epoxy......................................................................9
3-7. Finished pour, with weights removed ...................................................10
3-8. Second pour to bring the epoxy to grade...............................................11
3-9. Backer rod is used as a dam to control the epoxy .................................12
3-10. Compressed air is used to dry and clean the saw cut...........................13
3-11. Application of the sensor cable epoxy ................................................14
3-12. Finished epoxy application..................................................................15
3-13. A junction box is used when cable splices are needed to extend
the cable length .........................................................................................16
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IRS21 Lufft Intelligent Road Surface Sensor
1. Function
The IRS21 is a sensor that makes measurements of road surface. From
measurements taken, the outputs are up to three temperatures, conductivity,
percent salt, freezing temperature, road condition, and water film height. There
is also an error status output from the sensor. The sensor is used for road
weather stations.
Multiple frequency measurement,
measuring water film height,
snow, and ice
Sub-surface temp. 1
(not installed)
Measuring wet/dry
(conductivity)
Sub-surface temp. 2
(not installed)
Measuring the road surface temperature
FIGURE 1-1. IRS21
Measuring salt
concentration to
calculate the freezing
temperature
1
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
2. Sensors with exposed sensor cable in the road surface.
IRS21 Lufft Intelligent Road Surface Sensor
Equipment Needed for Installation
1. Drill and 5” core bit for the sensor hole.
2. Cement/concrete saw for the sensor lead saw cut with 1/2” saw blade.
3. Trencher for the sensor lead in the road shoulder.
4. Air nozzle to clean the cuts.
5. Hammer drill and 1/2” by 24” drill bit for the temperature sensors.
6. 115 VAC generator, 5 kW.
7. Portable compressor, 9 CFW.
Supplies Needed for Installation
1. Backer rod.
2. Epoxy.
3. PVC pipe for the sensor lead in the road shoulder. This isn’t required but
adds protection for the cable.
4. Chalk line.
5. Duct tape.
6. Hammer and chisel.
3
IRS21 Lufft Intelligent Road Surface Sensor
3. Installation
4
FIGURE 3-1. Core cut for the road sensor.
Hole diameter = 6”
Hole depth = 3”
Saw cut depth = 2”
Saw cut width = 1/2”
Locate the place in the pavement for the sensor. Drill the sensor hole 3” deep,
and clear the drilled hole of all excess material.
Saw cut the road surface for the sensor lead. The cut needs to be extended
beyond the sensor hole to completely clear the sensor hole of excess material.
IRS21 Lufft Intelligent Road Surface Sensor
B
A
FIGURE 3-2. Core drill (A) and saw cutting (B) equipment.
5
IRS21 Lufft Intelligent Road Surface Sensor
FIGURE 3-3. Saw cut is masked with duct tape to control the epoxies.
6
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