EL3000
CONTINUOUS GAS ANALYZERS | OI/EL3000-EN REV. D
33
Fidas24
Sample gas
Sample components
Hydrocarbons. The concentration of the gas components in the
sample gas path must not exceed the temperature-dependent
LEL. The analyzer temperature is 180 °C.
Sample gas inlet conditions
Fidas24 – sample gas input conditions
Temperature
≤
Thermostat temperature (thermostat
temperature for sample gas path, detector and air
injector ≤
200 °C, factory-set at180 °C)
Inlet pressure
p
abs
= 800 to 1100 hPa
Flow rate
approx. 80 to 100 l/h at atmospheric pressure
(1000 hPa)
Humidity
≤
40 % H
2
O
Note
The temperature, pressure and flow of the sample gas must be
kept constant, to such an extent that the influence of variations
on the measuring accuracy is acceptable.
Refer to
on page 210.
Requirements for the sample gas outlet
The outlet pressure must be the same as the atmospheric
pressure.
Flammable gases
The gas analyzer may be used for the measurement of
flammable gases provided that the flammable portion does not
up-scale 15 Vol.-% CH
4
or does not up-scale C1 equivalents.
Further properties of the sam
ple gas
The sample gas must not be explosive at any time.
The analyzer module must not be used for the measurement of
gases containing organometallic compounds, e.g. lead-
containing fuel additives or silicone oils.
Operational gases
Instrument air
Parameter
Value/Description
Quality
According to 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
,
Dew point: At least 10 °C below the lowest
expected ambient temperature
Inlet pressure p
e
4000 hPa, ±500 hPa
Flow rate
Typically approx. 1800 l/h (1200 l/h for the air jet
injector and approx. 600 l/h for the housing
purge),
max. approx. 2200 l/h (1500
l/h + 700
l/h)
Combustion air
Parameter
Value/Description
Quality
• Synthetic air or catalytically purified air
• Organic hydrocarbon content: < 1 % of the
measuring range
Inlet pressure p
e
1200 hPa, ±100 hPa
Flow rate
< 20 l/h
