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3098 Technical Manual Accuracy Considerations
4-3
Example 1
3098 SPECIFIC GRAVITY METER
CONTROL PRESSURE SELECTION
Date: 24th June 1997 Type of Gas: Natural Gas Specific Gravity Range: 0.55 to 0.8
3098 Serial No.: 000124 Temperature Coefficient of Density Meter: -0.0003 kg/m
3
/°C
CONTROL PRESSURE AT 20°C (lb/in
2
abs.)
(bars abs.)
18
1.2
30
2
60
4
100
7
DENSITY RANGE AT 20°C (kg/ m
3) 0.79 - 1.15 1.32 - 2.0 2.66 - 3.8 4.58 - 6.72
Measurement Errors (% of FS Specific Gravity/°C)
due to:
Density Meter Temp. Coefficient
-0.026 -0.016 -0.008 -0.004
Gas Compressibility of Sample Gas
+
0.0003 +0.0003 +0.001 +0.002
Velocity of Sound in Sample Gas
-0.003 -0.003 -0.003 -0.003
Reference Chamber/Relief Valve
+0.007 +0.007 +0.007 +0.007
Total Error
-0.022 -0.012 -0.003 to
-0.005
-0.000 to
-0.002
Example 2
3098 SPECIFIC GRAVITY METER
CONTROL PRESSURE SELECTION
Date: 28th July 1997 Type of Gas: N
2
/CO
2
mix Specific Gravity Range: 1.0 to 1.5
3098 Serial No.: Temperature Coefficient of Density Meter: -0.0003 kg/m
3
/°C
CONTROL PRESSURE AT 20°C (lb/in
2
abs.)
(bars abs.)
18
1.2
30
2
60
4
100
7
DENSITY RANGE AT 20°C (kg/ m
3) 0.4 - 2.16 2.4 - 3.6 4.8 - 7.2 8.4 - 12.6
Measurement Errors (% of FS Specific Gravity/°C)
due to:
Density Meter Temp. Coefficient
-0.014 -0.008 -0.004 -0.002
Gas Compressibility of Sample Gas
+
0.0002 +0.0004 +0.008 +0.015
Velocity of Sound in Sample Gas
-0.005 -0.005 -0.005 -0.005
Reference Chamber/Relief Valve
+0.007 +0.007 +0.007 +0.007
Total Error
-0.014 -0.006 +0.006 to
-0.010
+0.015 to
-0.015