
3-4
INSTALLATION
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Fife H3257
MI 1-921 1
Using the H3109
Discriminating
Detector
There are special considerations when the H3257 is used as a
light source for the H3109 sensor.
1. Always set the H3257 to intensity 8 (default).
2. Always set the H3257 to operate in pulsed mode (default).
3. A 4.7kΩ (1/4 W) load resistor must be placed across the
H3109 output and COM.
On most controllers, the resistor can be placed across the
detector input (such as DET 1 or DET2) and the COM
terminals at the controller.
Figure 3. Example of 4.7kΩ resistor installed on controller terminals.