Union Instruments CWD3000 EXP - Combustion Gas Requirements; Linearity and Measuring Ranges

Technical data
10
1.12 Combustion gas
NOTE
The combustion gas must be free of condensate, dust and other contaminants,
such as naphthalene.
Gas connection inlet
pressure:
Max. 500 bar, min. 20 mbar
Combustion gas
consumption:
30 – 40 l/h (min. rel. density 0.50 with 0.55 mm
nozzle)
Calibration gas
consumption:
Approx. 1/6 of the combustion gas; gas flow during
calibration: approx. 10 minutes ≈ 1/6 hour
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
2
, O
2
and CO
2
reduce the measuring range span.
Application
Applic. No.
Application (process gas type)
Measuring range
(Wobbe index)
Measuring accuracy
[Wobbe index]
Series
CWD2500
Series
CWD3000
Industries producing and using natural gas
001
Natural gas and biomethane
(and gases associated with crude oil)
30 – 60 MJ/m3 I 8.0 – 16.0 kWh/7,000 – 14,000
kcal/750 – 1,500 BTU
±1% FS ±1% MV
Refineries
004
Refinery gas
25 – 70 MJ/m3 I 7.0 – 20.0 kWh/6,000 – 16,500
kcal/650 – 1,800 BTU
±1.5% FS ±1.5% MV
Iron and steel
005
Blast furnace gas (BFG)
3 – 5 MJ/m3 I 0.8 – 1.4 kWh/700 – 1,200 kcal/80 – 130
BTU
±2% FS Not used
006
Coke oven gas (COG)
19 – 29 MJ/m3 I 5.3 – 8.0 kWh/4,500 – 7,000 kcal/480
– 740 BTU
±1% FS ±1% MV
007
Mixed gas (BFG + COG)
4 – 7 MJ/m3 I 1.1 – 1.9 kWh/1,000 – 1,700 kcal/100 –
180 BTU
±2% FS Not used
008
Mixed gas (BFG + COG)
3 – 5 MJ/m3 I 0.8 – 1.4 kWh/700 – 1,200 kcal/80 – 130
BTU
±2% FS Not used
009
Mixed gas (BFG + COG)
3.2 – 6.2 MJ/m3 I 0.9 – 1.7 kWh/750 – 1,500 kcal/80 –
160 BTU
±2% FS Not used
010
Mixed gas (BFG + COG)
5.0 – 12.5 MJ/m3 I 1.4 – 3.5 kWh/1,200 – 3,000
kcal/130 – 320 BTU/ft
3
±2% FS Not used