MSA GM FL5000 - Window Heater Operation

4 Principles of Operation
US FL5000 Multi-Spectrum Flame Detector 21
• the FL5000 goes into Phase 4:
○ indicates 1.5 mA (3.5 mA with HART and small HART current disabled) at the analog output
○ changes the LED flashing to indicate “Test Mode Activated"
After 4.25 minutes in Phase 4:
• the FL5000 returns to Ready Mode:
○ indicates 4.3 mA at the analog output
○ restores the LED flashing to “Ready”.
After 5 minutes, if Bluetoothis enabled (Phase 5):
• the unit will indicate Bluetooth activity by:
○ setting the analog output to 3.0 mA
○ changing the LEDflashing sequence to BluetoothActive mode
○ setting the relay to Ready state.
NOTE: After the test is initiated via wire or Modbus; all other commands are ignored until the Test Mode is over.
• While in Test Mode, the unit will not detect flames.
• Interruption of the Test Lamp flashing for more than 3 seconds will result in termination of the test sequence and a
return to Ready Mode (Phase 0).
4.4 Window Heater Operation
The window heater will turn on and off at certain temperatures to remove the water vapor on the window glass. The user
can disable the window heater with the Window Heater Disabled switch, see 5.7 Switch Selectable Options.