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FLAME ROD FLAME DETECTOR
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GENERAL DESCRIPTION: The
IRIS Model 600 Ultra Flame Rod is a reliable Flame Detecting system based on the proven principle of measuring rectified
current flow through a flame rod when a flame touches it.
An AC voltage is
applied to the flame rod; when a flame touches the rod, a rectified
current flows from the rod through the flame to the ground of the burner.
The Model 600 Flame Detector measures the rectified current and closes
the flame relay if the current exceeds the value for the flame-on
set-point.
If the current flow drops below the value for the flame-off
set-point, the flame relay opens.
A visual display indicates whether or
not the flame relay is on and the relative signal strength, i.e., the DC
current flow through the flame.
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The Model 600 is capable of driving either of the
following:
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an ignition coil. In this case the ignition coil would
be part on an ignitor assembly; when using the ignition coil, the flame
rod which is used for sensing flame serves also as an ignition rod.
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an ignition transformer. AC power to an external
ignition transformer is switched on by a power relay in the Model 600
Signal Processor when an ignition signal is applied. In this case, the
high voltage from the ignition transformer cannot be applied to the flame
rod; a separate ignition rod spaced well away from the flame rod is
required.
An AC or DC signal is applied to the Model 600
Signal Processor to turn on the ignition coil and the ignition transformer. When
the signal is applied, the Model 600 Signal Processor pulses the ignition
coil. The ignition signal also causes a power relay in the signal
processor to close,
connecting the fused AC input voltage to an external
ignition transformer if one is present. While the ignition signal is
applied, the flame relay is held open.
The flame sensitivity of the Model 600 Signal Processor can be changed
by a jumper. Four sensitivity levels are provided. The sensitivity of the
display and the values of the flame-on and flame-off set-points are
simultaneously changed together by the jumper.
Various protection features are provided. The flame rod
itself can be shorted to ground indefinitely without harm to the unit. If
the flame rod becomes fouled so that an unreasonably large amount of AC
current flows from the flame to ground, first a yellow "ROD FOULED" LED is
turned on. If the AC current increases further a "ROD FAULT" LED is turned
on and the flame relay is opened. Note that the Model 600 Signal Processor distinguishes between AC current flow due to
fouling and DC current flow caused by the presence of a flame. |
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APPROVALS |
| Optional: By CSA Special Acceptance |
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MODEL 600
ULTRA FLAME ROD
SPECIFICATIONS: |
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ELECTRICAL |
Primary Input Power |
85 to 132 VAC, or 170 to 264 VAC, 50 or 60 Hz |
| Input Current,
Monitoring only |
.07 A at 115VAC, .035
A at 230 VAC |
| Input Current,
Ignition on |
.3 A at 115VAC, .15 A
at 230 VAC
plus current to ignition transformer (5 AMPS MAX.) |
| Ignition Command
Input |
12 to 50 VDC or 85 to
264 VAC, 50 or 60 Hz (using labeled DC and AC inputs) |
| Command Current |
.02 A DC at 50 VDC,
.015 A RMS at 230 VAC |
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OUTPUTS |
Flame Relay |
DPDT contacts, rated 5A at 125 VAC, 277 VAC, and 30 VDC |
| Ignition Transformer
Relay |
DPST contacts, rated
5A at 125 VAC and 250 VAC |
| Ignition Coil Drive |
A capacitance of 4.4
uF is discharged from 230 VDC through the ignition coil tap at the
AC line rate by a 4A, 400 VRM SCR |
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ENVIRONMENTAL |
Ambient Temperature |
Controller (32F° to 140°F) 0°C to 60°C |
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SAFETY |
Flame rod voltage |
175 VAC at 115/230 VAC input |
| Flame rod current
(not firing) |
Maximum current to
ground <.5ma |
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