C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
9
65-0304—05
Pilot Turndown Test
When the detector is used to prove a pilot flame before the
main fuel valve(s) can be opened, perform a Pilot Turndown
Test before welding the sight pipe into position. Follow the
procedures in the flame safeguard control instructions and in
the burner manufacturer instructions.
Ultraviolet Response Tests Ignition
Spark Response Test
Test to be sure that ignition spark is not actuating the flame
relay in the flame safeguard control.
1.
Close the pilot and main burner manual shutoff valves.
2.
See Table 1 below for Flame Signal. Start the burner and
run through the Ignition period. Ignition spark should
occur, but the flame LED must not light. The flame signal
should not be greater than 0.25 Vdc.
Fig. 8. Measuring voltage flame signal with 7800 Series
controls.
Table 1. Flame Signal.
a
Shutter operation of the C7061M may cause fluctuations in the voltage reading. Read the average stable voltage, disregarding
the peaks.
b
Shutter operates at 12 cycles per minute.
3.
If the flame relay does pull in, reposition the detector far-
ther from the spark, or relocate/resight the detector to
eliminate/reduce the detector response to reflected UV
radiation. It may be necessary to construct a barrier to
block the ignition spark from the detector view. Continue
adjustments until the flame signal due to ignition spark is
less than the flame signal values indicated in step 2.
Response to other Ultraviolet
Radiation Sources
Some sources of artificial light produce small amounts of
ultraviolet radiation. Under certain conditions, an ultraviolet
detector responds as if it is sensing a flame. Do not use an
artificial light source to check the response of an ultraviolet
flame detector. To check for proper detector operation, conduct
flame failure response tests under all operating conditions.
Weld the Sight Pipe
When the flame signal is acceptable after all adjustments are
made, remove the detector and weld the sight pipe in its final
position. (If you are using a swivel mount, the pipe may be
already welded.) Then reinstall the detector.
Final Checkout
Before putting the burner into service, check out the installation
using the Checkout procedures in the Instructions for the
appropriate flame safeguard control. After completing the
Checkout, run the burner through at least one complete cycle
to verify correct operation.
IMPORTANT
Do not put the system into operation until all Checkout
tests in the Instructions for the appropriate flame
safeguard control and any others specified in the
burner installation instructions are satisfactorily
completed.
NEGATIVE (–)
METER LEAD
POSITIVE (+)
METER LEAD
ONE MEGOHM/VOLT
METER
M7382A
Flame Detector
Plug-in Flame Signal Amplifier
Minimum
a
Acceptable Steady
Voltage (Vdc)
Maximum Expected Voltage (Vdc)
C7061M
R7861 Dynamic Self-Check
a,b
1.25
5.0
