Fig. 9. Replacing ultraviolet radiation sensing tube.
9. Tighten 2 tube unit fixing screws removed during Step 4.
10. Make sure that the O-ring is not disengaged from the
11. Secure the cover with 4 cover mounting screws.
After replacing the ultraviolet sensing tube, be sure
to carefully mount the O-ring on the flange unit
before reattaching the cover. Otherwise the UV
sensor will not be properly sealed.
Tighten the terminal screws and mounting screws
with a tightening torque of 6 in.-lbs.
C7061M MINIATURE DYNAMIC SELF-CHECK ULTRAVIOLET FLAME DETECTOR
1. Mount the C7061M on the monitoring pipe
2. Turn on the power.
3. Start the combustion of the burner.
4. Measure the flame voltage at the Flame Amplifier.
Stable 1.25Vdc or more.
(The flame voltage may
fluctuate with the shutter
operation of this unit.)
NOTE: If the flame voltage exceeds 4.5Vdc, limit the
quantity of ultraviolet rays with an orifice ring or
the like. If there is too much ultraviolet radiation, it
can penetrate the tube unit even when the shutter
is closed, causing faulty operation.
Inspection and Adjustment
After replacing the UV sensing tube, perform a pilot turndown
test, an ignition spark response test and a safety shutoff test to
verify proper functioning of the tube unit.
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
• The flame is monitored
• The light-receiving lens
of this unit is not dirty.
• No soot or other foreign
matter has accumulated
in the monitoring pipe.