Overview, Sensing field of view – Banner T-GAGE M18T Series Temperature Sensors User Manual
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Overview
The T-GAGE analog sensor is a passive, non-contacting, temperature-based de-
vice. It is used to detect object(s) that are either hotter or colder than the ambient
condition, and then activate an output.
While it looks and operates just like an Expert™ photoelectric sensor, the T-
GAGE detects the infrared light energy emitted by objects, instead of its own
emitted light. The sensor uses a thermopile detector, made up of multiple infra-
red-sensitive elements (thermocouples) to detect this infrared energy within its
field of view (see Figure 2).
Potential applications include:
• Hot part detection (baked goods, metals, bottles)
• Ejection verification of injection-molded parts
• Flame process verification
• Hot glue detection (packaging equipment, book binding, product assembly)
• Cold part detection (frozen foods, ice, dairy)
• Roller monitoring
NOTE: The T-GAGE M18T sensor is not intended for
absolute temperature measurement or for safety-re-
lated fire detection use.
Figure 1. Sensor Features
1
Power/Teach LED
2
Alarm Output LED
3
TEACH Push Button
Sensing Field of View
The sensing range is determined by the sensor’s field of view (FOV), or viewing angle, combined with the size of the object(s) being
detected (see Figure 2). The sensor’s distance-to- spot size ratio (D:S ratio) is inversely related to the viewing angle; a sensor with a
small viewing angle will have a large D:S ratio. The T-GAGE M18T sensors have D:S ratios of 6:1, 8:1 or 14:1. For a sensor with an 8:1
D:S ratio, the sensor’s spot size is a 1" diameter circle at a distance of 8"; farther from the sensor face the spot size will be larger.
200
400
600
800
1000
Distance (mm)
Spot Size
(see table)
Sensor D:S
Ratio
Distance from Sensor Face Versus Spot Size
100
200
300
400
500
600
700
800
900
1000
Distance (mm)
6:1
17
33
50
67
83
100
117
133
150
167
Spot Size (mm)
8:1
13
25
38
50
63
75
88
100
113
125
14:1
7
14
21
29
36
43
50
57
64
71
Figure 2. Detection spot size versus distance from sensor
M18T T-Gage Sensor
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