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372001-24 Rev. A
IDDX Flame Detector Amplifier Manual
Functions Unavailable While Tuning
The following functions are not available when inside the tuning loop:
• The self-check cycle timer is not incremented while inside the tuning loop. The timer resumes counting
and the amplifier self-checks when the tuning loop is exited.
• The profile select inputs are not checked while tuning. If the profile is changed while tuning, any changes
made will be lost and the new profile loaded when the tuning loop is exited.
• The blind input is not checked while tuning. If this input is changed while tuning, the blind/un-blind will
occur when the tuning loop is exited.
• The watchdog timer/code is active at all times, but the WDT LED stops toggling while in the tuning loop
to serve as a visual reminder that tuning is still in progress.
Analog Outputs
• The analog output value corresponds to the average of the last five instantaneous counts of signal
intensity.
• The analog outputs 4-20mA is linearly scaled between the programmed low and high points respectively.
These will output minimum (4mA) if the input channel is off or the signal level is at or below the programmed
low point and will read full scale (4-20mA) if the signal level is at or above the programmed high point.
• No hardware zero or span adjustments are provided.
• 4-20mA output support Total load of 500 Ohm external load.
Amplifier Shutdown/Failure
If the amplifier fails or is shutdown the main flame and lamp outputs are turned off. The alarm output
is turned on. Signal acquisition stops. An error message is displayed on Termiflex . Power off/on or a
Reset is required to restart the system. Refer to Sec 4.2 for guidance on troubleshooting.
Caution:
The analog outputs are not intended for control of safety critical processes.
WARNING:
To ensure safe and reliable flame detection, it is the responsibility of the
commissioning engineer to perform all flame failure testing after programming the detector.
Ensure that the detector correctly detects the target flame (Flame “On” Condition) and
recognizes the target flame off (Flame “Off” Condition).
