Chapter 2 Getting started
Page 2.4
Figure 2.3: Prime Line density display
C A L I B R A T I O N C E R T I F I C A T E
7812xx GAS DENSITY METER Serial No:
Cylinder No:
Amplifier No:
Calibration Date:
123456
123456
123456
14JUL97
PRESSURE TESTED TO 375 BAR
DENSITY CALIBRATION FOR NITRIGEN AT 20 DEG C
Based on Pressure-Temperature-Density Data in IUPAC Tables
Gas Specific Gravity
G = -------------------------------
Ratio of Specific Heats
FINAL TEST &
INSPECTION
DATE14JUL97
Ref No: GD04/V1.5
FO R EXAMPL EO N L YDENSITY = K0 +K1.T + K2.T**2
K0 = -1.104252E+02
K1 = -1.882012E-02
K2 = 4.749797E+04
Nitrogen/Methane Gas Mixture Over Density Range 10 to 60 KG/M3
USER GAS OFFSET DATA
TEMPERATURE COEFFICIENT DATA
Dt = DI ( 1 + K18 ( t - 20 ) ) + K19 ( t - 20 ) K18 = -1.36E-05
K19 = 8.44E-04
( K3 ( G ) ) K3 = 354
DA = Dt ( 1 + ----------- ( 0.00236 - ----------- ) ) K4 = 57.4
( (Dt+K4) ( t+273 ) )
= Periodic Time (uS)
= Actual Density (KG/M3)
= Temperature (DEG. C)
= Indicated Density (KG/M3)
= Temp. Corrected Density (KG/M3)
where
T
DA
t
DI
Dt
DENSITY
[ kg/m2]
PERIODIC TIME
[us]
0
1
2
5
10
15
20
30
40
50
60
70
80
90
502.190
504.507
506.697
513.168
523.735
534.078
544.202
563.880
582.895
601.307
619.124
636.442
653.310
669.758