Oxygen sensor (WD200)
QG020 ver. 3
Oxygen sensor measures the amount of residual
oxygen from flue gas. The sensor is a ceramic
zirconium dioxide cell and self-testing.
Flame detector
QRI ver. 3
QRI
is a flame detector for use with gas,
oil and other flames that emit infrared light.
Flame signal intensity can be monitored on
display. Flame detector is equipped with self-
test function and is suitable for continuous
operation.
F200K ver. 1
F200K
is a flame detector for use with gas and
oil burners. Depending on type, it can detect
either IR or UV light. Flame signal intensity
can be monitored on display. Flame detector is
equipped with self-test function and is suitable
for continuous operation.
5.2 Legend to PI diagrams
Valve
Firing system, burner
Non-return valve
Filter
Regulator
Differential pressure switch
Shutoff valve
Flame detector
M4263 2206EN
77 (102)
