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

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