IBC SFC 99 Quick Start Manual page 6

Clocking the Meter (for Natural Gas only)
1. Turn off all other appliances and pilots.
2. Turn on the boiler and set the boiler to high fire.
3. Ensure the boiler has a large load to heat, so that the boiler will not shut off.
4. With a Stop-Watch, record the number of seconds for the smallest dial to make 1 full revolution.
5. CFH = (3600 x Dial Size) / Seconds
6. CFH x 1000 (check local Btu content) = Input Btu's.
Note
For 2 PSI meters multiply CFH x 1.097
For Metric meters multiply CFH x 35.3
For 2 PSI metric meters multiply CFH x 1.097 x 35.3
For Altitude above 4,500' deduct 2% per 1,000' of altitude from the Input Btu's.
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