Fig. 1.4: Measuring Ranges And Accuracy - Union Instruments CWD3000 EXP Operating Instructions Manual

Applic. No.
Mixed gas (BFG + COG)
011 5.2 – 10.5 MJ/m3/1.4 – 2.9 kWh/1,250 – 2,500
kcal/130 – 260 BTU/ft
Mixed gas (BOFG + NG)
4.2 – 12.6 MJ/m3 I 1.2 – 3.5 kWh/1,000 – 3,000
012
kcal/110 – 320 BTU/ft
Raw biogas
017 4.0 – 7.0 MJ/m3/1.1 – 1.9 kWh/950 – 1,650 kcal/100 –
175 BTU/ft
Flare gas
0 – 90 MJ/m3 I 0 – 25 kWh/0 – 21,500 kcal/0 – 2,290
019
BTU
Flare gas
0 – 118 MJ/m3 I 0 – 32.8 kWh/0 – 28,180 kcal/0 –
020
3,000 BTU
Flare gas
021 > 800 MJ/m3 I > 222 kWh/> 191,000 kcal/> 20,340
BTU/ft 3
Synthesis gas
024 0 – 10 MJ/m3 I 0 – 2.8 kWh/0 – 2,390 kcal/0 – 250
BTU/ft 3
Carbide gas "low"
8.4 – 12.4 MJ/m3 I 2.3 – 3.4 kWh/2,010 – 2,960
025
kcal/210 – 320 BTU/ft
Carbide gas "high"
026 12.5 – 19 MJ/m3 I 3.5 – 5.3 kWh/2,990 – 4,540
kcal/320 – 480 BTU/ft
Mixed gas LPG (Liquefied Petroleum Gas) + air
(compliance)
027
32 – 58 MJ/m3 I 8.9 – 16.1 kWh/7,640 – 13,850
kcal/810 – 1,480 BTU
Mixed gas LPG + air
029 42 – 59 MJ/m3 I 11.7 – 16.4 kWh/10,030 – 14,090
kcal/1,070 – 1,500 BTU/ft
LPG
030 70 – 87 MJ/m3 I 19.4 – 24.2 kWh/16,720 – 20,780
kcal/1,780 – 2,220 BTU/ft
MJ: Mega Joule;
Fig. 1.4: Measuring ranges and accuracy
Application
Application (process gas type)
Measuring range
(Wobbe index)
3
3
Biogas plants
3
Oil & gas chemicals
Synthesis gas
Metallurgy
3
3
Testing and certification
LPG
3
3
BTU: British Thermal Unit;
Measuring accuracy
[Wobbe index]
Series
CWD2500
±2% FS
±2% FS
±1.5% FS
±3% FS
±3% FS
±3% FS
±3% FS
±1.5% FS
±1.5% FS
±1% FS
±1% FS
±1% FS
FS: Full Scale; MV: Measured Value
Technical data
Series
CWD3000
Not used
Not used
±1.5% MV
±2% FS
±2% FS
±2% FS
±2% FS
±1.5% MV
±1.5% MV
±1% MV
±1% MV
±1% MV
11