42/23-571 EN Rev. 5
Installation Instructions ACF-NT, ACF-NT V0309
9
Gas Supply Requirements
Characteristic Inlet
Pressure
Flow
Analyzer System
Sample gas
6)
Temperature controlled at 180
2 °C
by means of the heated sample gas
line
p
abs
= 900 to 1100 hPa
(0.9 to 1.1 bar)
approx. 250 l/h
Instrument air
2)
Based on ISO 8573-1 Class 2
(max. particle size 1 μm,
max. particle density 1 mg/m
3
,
max. oil content 0.1 mg/m
3
,
max. pressure dew point –20 °C)
p
e
= 5000 to 7000 hPa
(5.0 to 7.0 bar)
approx. 1700 l/h
for FTIR and
approx. 1500 l/h
for VOC
FTIR Analyzer
Zero gas for the
FTIR spectrometer
Clean air from air purifier
p
e
=
1100
100 hPa
(1.1
0.1 bar)
500 l/h
Span gas for the
FTIR spectrometer
4)
Measurement component in N
2
70 to 80 % of measuring range
(accuracy
2 %)
p
e
=
1100
100 hPa
(1.1
0.1 bar)
500 l/h
VOC Analyzer
1)
Combustion gas
H
2
, quality 5.0
p
e
=
1200
100 hPa
(1.2
0.1 bar)
3 l/h
3)
Zero gas
N
2
, quality 5.0
or zero gas for the oxygen analyzer
p
e
=
1100
100 hPa
(1.1
0.1 bar)
120 l/h
Span gas
5)
n-Propane C
3
H
8
in N
2
70 to 80 % of measuring range
(accuracy
2 %)
p
e
=
1000
100 hPa
(1.0
0.1 bar)
80 to 120 l/h
O
2
Analyzer
1)
Zero gas
1 to 4 Vol% O
2
in N
2
(accuracy
2 %)
p
e
=
1100
100 hPa
(1.1
0.1 bar)
500 l/h
Span gas
Clean air from the air purifier
(20.96 Vol% O
2
)
p
e
=
1100
100 hPa
(1.1
0.1 bar)
500 l/h
1)
Option
2)
Provide a pressure gauge and a shut-off valve.
3)
Provide a flow limiter. Recommendation: Provide two 40 l cylinders and a
switchover station.
4)
H
2
O, HCl, HF and NH
3
test gases for calibration are produced with a vapor
generator by vaporizing either distilled water or HCl, HF or NH
3
solutions with
known concentrations.
5)
As the VOC analyzer only measures the number of carbons the concentration
of the span gas has to be calculated from ppm or mg/m
3
C
n
H
m
to ppm or
mg/m
3
C
6)
For information regarding sample components and measuring ranges refer to
ACF-NT operator’s manual, “Operating Specifications” section in the Appendix
Definition
p
e
= p
abs
– p
amb
with p
e
= positive pressure, p
abs
= absolute pressure, p
amb
= atmospheric pressure
