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14 Micro Motion 3098 Gas Specific Gravity Meter
Installation Procedure
27. Shut valve B and disconnect the second calibration gas bottle from pipework.
28. Open the isolation valve D.
29. Open valve A.
2.7 Outline dimensional drawings
Figure 2-3 shows a 3098 specific gravity meter without an enclosure. For dimensions of small and
large enclosures, see Figure 2-4 and Figure 2-5.
If the application is running with a reference pressure less than 45.5 psi (3 Bar A), the maximum
flow rate that can be used for correct operation is 50 cc/s. A full explanation of this effect is given
in Chapter 4.
The unit should now give a live reading of the measured gas SG. If the unit does not output a
sensible reading, certain checks can be made. These checks are summarized in Chapter 5.
If optimum SG accuracy is required, the optimization method described in Appendix A – which
compensates for errors due to gas velocity of sound, compressibility and temperature coefficient
– should be used.
For optimum accuracy, the time period (τ) must be resolved to ±0.1 ns. This can be achieved
using 7950/7951 signal converters and flow computers set to a cycle time of 10 s.