Commercial and lndustrial MACH 10
®
Ultrasonic Meter Installation and Maintenance Guide 41
Appendix B: MACH 10
®
)R900i™ Flags
The three tables in this appendix describe the volume represented by the eighth digit by
meter size and the flags used by the MACH 10
®
)R900i (digits) and MACH 10
®
)R900i
(minutes).
Register Size
Eighth Digit Resolution -
Least Significant Digit
3 inch and 4 inch 1 U.S. Gallon or 1/10 Cubic Feet
6 inch 10 U.S. Gallons or 1 Cubic Foot
Table 25 – Eighth Digit Resolution by Meter Size – Commercial and Industrial
Backflow Flag (Resets After 35 Days)
Based on reverse movement of the eighth digit; eighth digit is variable
based on the meter size.
No backflow event Eighth digit reversed less than one digit.
Minor backflow Eighth digit reversed more than one digit up to 100 times the eighth digit.
Major backflow event Eighth digit reversed greater than 100 times the eighth digit.
Table 26 – MACH 10
®
)R900i™ Flags (digits)
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