Combustion Gas; Linearity And Measuring Ranges - Union Instruments CWD3000 EXP Operating Instructions Manual

Explosion-protected combustion calorimeter
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Technical data

1.12 Combustion gas

NOTE
The combustion gas must be free of condensate, dust and other contaminants,
such as naphthalene.
Gas connection inlet
pressure:
Combustion gas
consumption:
Calibration gas
consumption:

1.13 Linearity and measuring ranges

The measuring ranges cannot be utilized from 0% to 100%. The range is
dependent on the gas composition. Ranges of 45 – 100% are typical for a
measuring range. Hydrogen content in the gas increases the measuring range
span. Inert gases such as N
Applic. No.
Natural gas and biomethane
(and gases associated with crude oil)
001
30 – 60 MJ/m3 I 8.0 – 16.0 kWh/7,000 – 14,000
kcal/750 – 1,500 BTU
Refinery gas
004
25 – 70 MJ/m3 I 7.0 – 20.0 kWh/6,000 – 16,500
kcal/650 – 1,800 BTU
Blast furnace gas (BFG)
3 – 5 MJ/m3 I 0.8 – 1.4 kWh/700 – 1,200 kcal/80 – 130
005
BTU
Coke oven gas (COG)
006
19 – 29 MJ/m3 I 5.3 – 8.0 kWh/4,500 – 7,000 kcal/480
– 740 BTU
Mixed gas (BFG + COG)
007
4 – 7 MJ/m3 I 1.1 – 1.9 kWh/1,000 – 1,700 kcal/100 –
180 BTU
Mixed gas (BFG + COG)
008
3 – 5 MJ/m3 I 0.8 – 1.4 kWh/700 – 1,200 kcal/80 – 130
BTU
Mixed gas (BFG + COG)
009
3.2 – 6.2 MJ/m3 I 0.9 – 1.7 kWh/750 – 1,500 kcal/80 –
160 BTU
Mixed gas (BFG + COG)
010
5.0 – 12.5 MJ/m3 I 1.4 – 3.5 kWh/1,200 – 3,000
kcal/130 – 320 BTU/ft
10
Max. 500 bar, min. 20 mbar
30 – 40 l/h (min. rel. density 0.50 with 0.55 mm
nozzle)
Approx. 1/6 of the combustion gas; gas flow during
calibration: approx. 10 minutes ≈ 1/6 hour
, O
and CO
2
2
Application
Application (process gas type)
Measuring range
(Wobbe index)
Industries producing and using natural gas
Refineries
Iron and steel
3
reduce the measuring range span.
2
Measuring accuracy
[Wobbe index]
Series
CWD2500
±1% FS
±1.5% FS
±2% FS
±1% FS
±2% FS
±2% FS
±2% FS
±2% FS
Series
CWD3000
±1% MV
±1.5% MV
Not used
±1% MV
Not used
Not used
Not used
Not used

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