Sensor Setup
Gem-5 User’s Manual 365
Photoelectric Sensors
Several styles of photoelectric sensors are used on different models (Table 41 on page
349). These include through-beam infrared, through-beam visible red, adjustable
range reflective and background suppression infrared.
Through-Beam Infrared Photo Sensor
This sensor is a two-piece transmit-receive type. An LED in the emitter unit sends an
infrared beam to the receiver. The sensor is activated by breaking the beam.
The receiver is equipped with a sensitivity adjustment. It is factory preset, but may be
changed if required. Activation can be confirmed by the built-in LEDs, and on the
F6 – Sensor Board Test screen in the F2 – Test Menu.
Figure 157 The Indicators and Sensor Control for the IR Receiver
Functions and Controls
Stability Indicator (Green LED) on receiver: Should be on to indicate stability.
When the green LED is off, the sensor is operating close to its sensitivity limit, and
the sensor may operate unreliably.
Operation Indicator (Orange LED) on receiver: The orange LED is lit when an
object is detected.
Power Indicator (Orange LED) on transmitter. This, the only LED on the
transmitter, should be on at all times when the unit is powered.
Sensitivity Adjuster: One-turn trim pot for sensitivity adjustment. Turn clockwise to
increase sensitivity or counterclockwise to decrease sensitivity. The only purpose for
this adjustment is to reflect a variation in the distance between the transmitter and the
receiver. It is factory-preset and should not normally require adjusting.
Operation Selector: Some units have an operation selector to select Light-On or
Dark-On operation. If present, this should be set to L for Light-On operation.
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