Chapter 3: System operation
152 P/N 3102351-EN • REV 005 • ISS 28DEC18
Activating and restoring sensor bypass
Use the Activate Sensor Bypass option to stop the photoelectric element on the PHS/PHD
detector from generating supervisory messages on the LCD, while still using the heat element
of the same PHS/PHD. Sensor Bypass is applicable to PHS/PHD devices with device type as
“Heat + Smoke Supv Latching,” or “Heat + Smoke Supv Nonlatching,” only.
Use the Restore Sensor Bypass option when both the heat and smoke (photoelectric)
elements of the PHS/PHD return to normal operation. Activation messages for either condition
appear on the LCD.
When Sensor Bypass is activated, the system displays an alarm message only when the heat
element activates. For example, when a large event is planned that allows smoking or
pyrotechnics in a ballroom that has a PHS/PHD detector installed; you may choose to bypass
the smoke element to prevent false activations while still using the heat element to detect a
fire.
When a device is off-normal and you attempt to activate or restore sensor bypass, the system
displays a warning message. When the activate sensor bypass option is applied to a device,
the system responds as follows:
• The common trouble LED turns on.
• The LCD displays an event to indicate that the device is bypassed.
• The common Trouble LED flashes and the panel goes into a trouble state.
• The common Trouble relay changes state.
• The active point indicators on the LCD increment.
• Resetting the panel has no effect on sensor bypass activated devices, but removing all
power from the panel clears the sensor bypass and restores the device.
To activate sensor bypass:
1. Press the Menu button and choose Control.
2. Enter a level one password.
3. Choose Activate/Restore.
4. Choose Sensor Bypass.
5. Select the device that you want to bypass.
6. Press Enter.
7. Press Cancel to return to the previous menu.
— or —
Press the Menu button to exit menu mode.
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