User's Guide

Chapter 2: Pre-Installation Considerations
RTMS Echo User Guide ©2019 Image Sensing Systems Inc. 2-11
Height, Setback, Tilt Requirements
The RTMS Echo has a detection area of 250 ft (76 m), and is able to detect up
to 12 lanes of traffic within that distance. ISS recommends mounting the Echo
sensor between 15 and 35 ft (4.6 and 10.7 m) from the ground. The height is
based on the distances from the closest and furthest zones. The mounting
height and zone distances determine the angle (tilt) at which the sensor
should be set.
If the closest zone is 6 ft (1.8 m) or less and the furthest zone is less than 75 ft
(22.9 m), the suggested mounting height is 15 ft (4.6 m) with a tilt of 27
degrees. If the closest zone is greater than 6 ft (1.8 m) but less than 30 ft (9.1
m), the suggested mounting height and tilt is also 15 ft (4.6 m) and 27
degrees.
The following table shows the ISS recommend mounting height (up to 35 ft
[10.7 m]) when the closest zone is greater than 6 ft (1.8 m) and the furthest
zone is between 35 ft (10.7 m) and 250 ft (76.2 m).
Table 2-4: Height, Setback, Tilt when Closest Zone is Greater Than 6 ft (1.8 m)
Furthest
Zone (ft / m
Mounting
Height (ft / m)
Tilt (degrees)
Furthest
Zone (ft / m
Mounting
Height (ft / m)
Tilt (degrees)
35 / 10.7
40 / 12.2
45 / 13.7
50 / 15.2
55 / 16.8
60 / 18.3
65 / 19.8
70 / 21.3
75 / 22.9
80 / 24.4
85 / 25.9
90 / 27.4
95 / 29.0
100 / 30.5
105 / 32.0
110 / 33.5
115 / 35.1
120 / 36.6
125 / 38.1
130 / 39.6
135 / 41.1
140 / 42.7
15 / 4.6
15 / 4.6
15 / 4.6
15 / 4.6
15 / 4.6
15 / 4.6
15 / 4.6
15 / 4.6
16 / 4.9
16 / 4.9
17 / 5.2
18 / 5.5
19 / 5.8
20 / 6.1
21 / 6.4
21 / 6.4
22 / 6.7
23 / 7.0
24 / 7.3
25 / 7.6
26 / 7.9
26 / 7.9
23
21
18
17
15
14
13
12
12
11
11
11
11
11
11
11
11
11
11
11
11
11
145 / 44.2
150 / 45.7
155 / 47.2
160 / 48.8
165 / 50.3
170 / 51.8
175 / 53.3
180 / 54.9
185 / 56.4
190 / 57.9
195 / 59.4
200 / 61.0
205 / 62.5
210 / 64.0
215 / 65.5
220 / 67.1
225 / 68.6
230 / 70.1
235 / 71.6
240 / 73.2
245 / 74.7
250 / 76.2
27 / 8.2
28 / 8.5
29 / 8.8
30 / 9.1
31 / 9.4
31 / 9.4
32 / 9.8
33 / 10.1
34 / 10.4
35 / 10.7
35 / 10.7
35 / 10.7
35 / 10.7
35 / 10.7
35 / 10.7
35 / 10.7
35 / 10.7
35 / 10.7
35 / 10.7
35 / 10.7
35 / 10.7
35 / 10.7
11
11
11
11
11
10
10
10
10
10
10
10
10
9
9
9
9
9
8
8
8
8