
®
ENGINEERING COMPANY INC.
51 Winthrop Road 
Chester, Connecticut 06412-0684
Installation Guide:
CanTrol™ Light Sensor
Phone: (860) 526-9504 
Fax: (860) 526-4078 
Internet: www.whelen.com 
Sales e-mail: autosale@whelen.com 
Canadian Sales e-mail: canadiansales@whelen.com 
Customer Service e-mail: custserv@whelen.com
WARNING! Permanent mounting of this product will require drilling. It is absolutely necessary to make sure that no other vehicle 
components could be damaged by this process. Check both sides of the mounting surface before starting. If damage is likely, select 
a different mounting location.
Mounting and connections...
1. Place the flange onto the mounting surface and mark the location for the two mounting 
screws and the wire access hole location as shown. 
2. Drill two pilot holes for the two #6 X 3/8" sheet metal mounting screws and a 3/8” wire access 
hole. Be sure to thoroughly deburr this hole.
3. Route the wires through the gasket and the wire access hole and secure the lighthead with 
the supplied mounting screws. NOTE: Make sure the Whelen logo on the lens is oriented 
correctly after mounting.
4. Connect the sensor wires as follows:
RED -  Connect to an ignition controlled +12.8VDC power source 
BLACK -  Connect to Chassis Ground 
WHT/RED - Connect to the first available Analog Input on CanTrol™
          (for example: Analog 1)
In order to operate correctly, the appropriate analog input must be properly configured using the 
CanTrol™ programming software. The following values are presented as a starting point. 
Individual applications may require different values than those shown here.
Update = Select the maximum value (200 ms.) 
Average = Select the maximum value (10) 
Upper Trip Point = Select a starting value of 6.1V (see graph for details) 
Lower Trip Point = Select a starting value of 5.9V (see graph for details)
IMPORTANT! Before returning this vehicle to active service, confirm proper operation of 
this product, as well as all vehicle components/equipment.
8
7
6
5
4
3
2
1
Analog Voltage vs Ambient Light Level (Lux)
1.550"
1.130"
Mounting Hole for
heet etal crew#6 S M S
3/8” WIRE
HOLE
 Lux Voltage Out
0.3 .................... 0.0
0.8 .................... 0.4
1.9 .................... 1.1
3.6 .................... 1.9
6.7 .................... 2.6
11.3 .................... 3.2
17.5 ....................3.7
24.6 ....................4.2
33.3 ....................4.5
43.0 ....................4.9
53.9 ....................5.2
65.5 ....................5.4
77.7 ....................5.6
90.0 ....................5.8
105.0 .................... 6.0
118.0 .................... 6.1
132.0 .................... 6.3
146.0 .................... 6.4
160.0 .................... 6.5
176.0 .................... 6.6
191.0 .................... 6.7
207.0 .................... 6.8
221.0 .................... 6.9
237.0 .................... 7.0
270.0 .................... 7.1
278.0 .................... 7.2
306.0 .................... 7.3
336.0 .................... 7.4
351.0 .................... 7.5
.457"
.915"
Automotive: CanTrol™
For warranty information regarding this product, visit www.whelen.com/warranty
©2010 Whelen Engineering Company Inc. 
Fo r m No . 144 3 8 (0 3 1111)
0
0.1
0.3
0.8
1.9
3.6
6.7
11.3
17.5
24.6
33.3
43.0
53.9
65.5
77.7
90.0
105.0
118.0
132.0
146.0
160.0
176.0
191.0
207.0
221.0
237.0
253.0
270.0
278.0
306.0
323.0
336.0
351.0
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