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Installation Procedure 3098 Technical Manual
2-6
IMPORTANT NOTE
If the application is running with a reference pressure less than 45.5 psi (3 BarA), the maximum flow rate that can be used
for correct operation is 50cm
3
/s. A full explanation of this effect is given in Accuracy Considerations, 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 summarised in Chapter 5, ‘Maintenance & Fault finding’.
If optimum SG accuracy is required, the optimisation 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 ±0.1ns. This can be achieved using 7950/7951/7955 signal
converters and flow computers set to a cycle time of 10s.