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Range and Detection of Desk Occupancy Sensor
Range and Detection of Desk Occupancy Sensor
Updated over a week ago

This document outlines the detection pattern of the Desk Occupancy Sensor and assists in determining the correct position relative to the table's edge, based on the table's height.

During sensor installation, the goal is to minimize false positive readings that can occur when someone passes close to the desk edge. This is achieved by selecting the appropriate distance from the edge of the table.

Figure 1 - Detection Diagram


Table 1 - detection pattern dimensions

h

l

r

50

75

9

55

83

10

60

90

11

65

98

12

70

105

13

75

113

14

80

120

15

85

128

16

90

136

17

95

143

17

100

151

18

105

158

19

110

166

20

115

173

21

120

181

22

125

188

23

130

196

24

135

203

25

140

211

26

Definitions:

h [cm]

Mounting height of the sensor

l [cm]

Range of detection in front of the sensor

l’ [cm]

Range of detection from the edge of the desk

r [cm]

Range of detection behind the sensor

p [cm]

Distance of the sensor from the edge of the desk

Notes:

  • Sensors need to be mounted according to the installation manual, ensuring the PIR lens is oriented in the specified direction.

  • If the detection pattern is blocked or partially obstructed by any obstacle on the underside of the desk, the range cannot be guaranteed.


Mounting Recommendation

This table shows the distance from the edge of the table at which the sensor detects movement, based on its height and position.

  • For regular sitting desks with a height of 70-80 centimeters, we recommend placing the sensor 15-30 centimeters from the edge of the desk.

  • For standing desks with a height of 110-130 centimeters, we recommend placing the sensor further away, 40-60 centimeters from the edge, to reduce the detection range in a standing position and minimize false positives.

Table 2 - Range of the detection l’ [cm] from the edge of the desk based on height and sensor position (h and p [cm])

p=10

p=20

p=30

p=40

p=50

p=60

h=50

65

55

45

35

25

15

h=55

73

63

53

43

33

23

h=60

80

70

60

50

40

30

h=65

88

78

68

58

48

38

h=70

95

85

75

65

55

45

h=75

103

93

83

73

63

53

h=80

110

100

90

80

70

60

h=85

118

108

98

88

78

68

h=90

126

116

106

96

86

76

h=95

133

123

113

103

93

83

h=100

141

131

121

111

101

91

h=105

148

138

128

118

108

98

h=110

156

146

136

126

116

106

h=115

163

153

143

133

123

113

h=120

171

161

151

141

131

121

h=125

178

168

158

148

138

128

h=130

186

176

166

156

146

136

h=135

193

183

173

163

153

143

h=140

201

191

181

171

161

151

Green – Ideal mounting height and sensor position relative to the edge of the desk.

Yellow – Acceptable mounting height and sensor position, though it may occasionally cause false positives due to a longer detection pattern. When the sensor is positioned 50 to 60 cm from the desk edge, there is a possibility of false positives caused by movement on the opposite side of the desk, depending on desk placement.

Red – Most likely to cause false positives due to a very long detection pattern.

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