10
INZ-TN2ZRE-E
3.4.6 Example configuration of gas sampling system
The following illustrates a typical system configuration for five component gas measurement for
monitoring combustion exhaust gas from boiler, refuse incinerator, etc.
Contact Fuji Electric for system configuration matching the particular use or further information.
(1) Gas extractor
15
Drain
Exhaust
2-way
solenoid
valve
Air
ZERO NO
SO
2
CO
O
2
CO
2
NO
/N
2
SO
2
/N
2
CO
2
/N
2
CO
/N
2
O
2
/N
2
Infrared gas
analyzer
main frame (O
2
)
ZRE unit
or larger
(10)
Zirconia
O
2
senor
φ
10/
φ
8
Teflon
tube
(ZFK7)
(2) Mist filter
(3) Safety
drain
trap
(4) Gas aspirator
Electronic
gas cooler
(5)
(8) Flowmeter
(7) Membrane
filter
(11) NO
2
/NO
converter
(6)
Solenoid
valve
Pressure
reducing valve
(9) Standard gas
3.4.5 Pressure at sampling gas outlet
Pressure at the sampling gas outlet should be adjusted to the atmospheric pressure.
Name
Description
Name
Description
(1) Gas extractor
Gas extractor with a heating
type stainless steel filter of
standard mesh 40µm
(8) Flowmeter
Adjusts and monitors the flow
rate of the sample gas.
(2) Mist filter
Removes drain, mist, and dust. (9) Standard gas
Reference gas used for cali-
brating zero and span of the
analyzer, depending on the
measured gas.
(3) Safety drain trap
The safety drain trap is divided
into two rooms for positive and
negative pressure. It moni-
tors and adjusts the sample gas
pressure.
(4) Gas aspirator
For aspiration of the sample gas (10) Zirconia O
2
sensor
External zirconia oxygen
sensor used for measuring
the oxygen concentration in
sample gas.
(This is not necessary in case
when O
2
sensor is built-in.)
(5) Electronic gas
cooler
Dries the moisture in the
sample gas to a dew point of
approx. 2˚C.
(6) Solenoid valve
Used for introducing the cali-
bration gas.
(7) Membrane filter
PTFE filter used to eliminate
fine dust particles.
(11) NO
2
/NO con-
verter
Added to NOx analyzer.
A special catalyst material for
efficient conversion of NO
2
gas to NO is used.
