Preferred FlexFit 110 - Flame Scanner;Relay; Flame Status; Figure

Installation – Flame Scanner/Relay 2-27
FlexFit – Linkageless Control – Revision 1.0
PREFERRED
UTILITIES MFG CORPORATION
II
NN
SS
TT
AA
LL
LL
AA
TT
II
OO
NN
Figure 2 – 14 QD1
QD1-Cable-F-xx
QD1-Cable-MF-xx
M
F
F
M
Address:
0
M
F
F
M
Address:
1
M
F
F
M
Address:
2
F
F
M
M
F
F
M
M
F
F
M
Address:
5
Address:
4
Address:
3
Burner
Control
Panel
BMU-SM-tt-QD1MF servos
Daisy-chain Connections (Example)
Figure 2 – 15 QD1
QD1-Cable-F-xx
M
F
F
M
Address:
0
M
F
F
M
Address:
1
M
F
F
M
Address:
2
Burner
Control
Panel
BMU-SM-tt-QD1MF servos
F F F F FF
M
IN
A B C D E F
F
M
Address: 5
F
M
Address: 4
F
M
Address: 3
QD1-Cable-MF-xx
BMU-SM-tt-QD1M servos
(BMU-SM-tt-QD1MF servos
can also be used)
Quick Disconnect
Junction Box (QD1-JB)
MMM
F
M
F
QD1-Cable-MF-xx
For long runs, multiple
cables may be
connected together.
Mixed Junction Box & Daisy-chain Connections (Example)
Flame Scanner/Relay
Figure 2 – 16 FlexFit Flame Scanner (Model BMU-UVSC)
The FlexFit can be congured for multiple styles of scanners, including UV, UVSC, and IR. The FlexFit provides a power supply
and the analog inputs for the ame intensity relay display. Preferred Instruments ame scanners are intended for monitoring all gas,
oil, and waste gas red burners. An internal microcomputer controls functions and supervises all essential circuits, verifying they
are always operating correctly. Two LEDs indicate scanner status – ame is proven and ame intensity. The self-checking model
automatically checks the detector and signal processor every 10 seconds.
It has machined alloy housing with seals and a high quality, fused silica quartz lens. There are no scheduled replacement parts
and scanners can be replaced without disturbing wiring.
Flame Status
When a ame is detected, the 4-20mA output will go to a level proportional to ame intensity, and the ame status LED will turn
red. This light will vary in intensity proportional to the level of the ame signal (strength) detected. The ame status LED is a dual color
LED. It will ash green every ten-seconds indicating that the self-check feature is working (the shutter is closing).