18
ACX Analyzer System Commissioning Instruction
CI/ACX-EN Rev. D
AO2000-Magnos27: Test Gas Inlet Conditions
Characteristic
Pressure p
e
Flow
Zero Gas
N
2
500
±
50 hPa
(= 0.5
±
0.05 bar)
130 to 250 l/h
Span Gas
Air
AO2000-Fidas24: Supply Gas and Test Gas Inlet Conditions
Characteristic
Pressure p
e
Flow
Instrument Air
1)
Based on ISO 8573-1 Class 2
(particle size max. 1 µm, particle density max.
1 mg/m
3
, oil content max. 0.1 mg/m
3
, pressure
dew point at least 10 °C below the lowest
expected ambient temperature)
4000
±
500 hPa
(4.0
±
0.5 bar)
approx. 1500 l/h
Combustion Air
2)
Synthetic air or catalytically cleaned air with
an org. C content of < 1 % of the span
1200
±
100 hPa (1.2
±
0.1 bar)
max. 40 l/h
Combustion Gas
3)
H
2
(quality 5.0)
1200
±
100 hPa (1.2
±
0.1 bar)
approx. 3 l/h
Zero Gas
N
2
(quality 5.0) or synthetic air or catalytically
cleaned air
1000
±
100 hPa (1.0
±
0.1 bar)
130 to 250 l/h
Span Gas
4)
Sample component or substitute gas
component in N
2
or air
1000
±
100 hPa (1.0
±
0.1 bar)
130 to 250 l/h
1)
Provide a shutoff valve with a p
e
= 4.5 to 7 bar pressure gauge.
Instrument air is used as
•
drive air for the air injector (if installed),
•
combustion air,
•
emergency purge air.
2)
Separate combustion air supply is required if the analyzer system is not equipped
with a combustion air conditioning module (catalyst).
3)
Recommendation: Provide two 40 l cylinders and a switchover station.
Note: For safety reasons, a flow limiter is integrated in the bulkhead connector
provided for connection of the combustion gas line to limit the combustion gas
flow to 10 l/h.
4)
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.
•
Perform regular inspections of the external combustion gas line.
•
Install a pressure relief valve in the combustion gas line outside of the analyzer
cabinet
•
Set the pressure relief valve to < 2 bar to securely limit the maximum supply
pressure.
Definition
p
e
= p
abs
– p
amb
with p
e
= positive pressure, p
abs
= absolute pressure, p
amb
= atmospheric pressure
