The iScan2 is a DSP (digital signal processor) based instrument. The flame scanner uses a solid-state optical detector to generate an analog signal. The optical detector operates in ultraviolet and infrared light spectra. The processor uses DSP techniques to determine if a flame is present.
The flame scanner incorporates a self-check system that tests all critical components every 20 seconds. A selfcheck failure will automatically de-energize the internal flame relay (relays if configured in Redundant Flame
Relay Mode) and energize the fault relay (if configured in the Independent Flame/Fault Relay Mode).
FLICKER – Flicker or Flicker Frequency refers to the modulation of flame intensity due micro-explosions of the fuel.
FDORT – Flame Detector ON Response Time – the period of time from flame intensity rising above the user adjustable threshold to flame relay contacts closed.
FDRT – Flame Detector Response Time –the period of time between the loss of a sensed flame and the signal indicating the absence of flame.
MFFRT – Marginal Flame Fail Response Time – period of time from flame intensity falling below the the user adjustable threshold to the flame relay contacts open.
EASI – Electronically Assisted Sight Indicator – refers to the red LED (Light Emitting Diode) located on the back of the Non-hazardous Area Models, that flashes to indicate flame intensity. When no flame is present the LED blinks approximately 1 time per second. When a flame is present the LED’s blink rate increases proportional to the flame intensity. At optimal sighting and scanner gain, the LED blinks at approximately 30 times per second. If the LED is on solid or off the scanner is faulted and should not be used.
DSFComm – This acronym stands for Digital Scanning Flame-detector Communications software.
GAIN – When a signal is amplified, GAIN is the ratio of the amplified signal relative to the original.
DISCRIMINATION – is the ability to distinguish between multiple flames. An example of good discrimination is when the MB scanner is able to recognize a pilot flame with other burner’s main fuel flame in the background.
The status of the main (background) flame does not affect the ability to detect the pilot flame (ON or OFF).