Meriam M2 – Series Smart Manometer - Manual (Page 38)

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Appendix 1: Rotary Gas Meter Tester
Instructions
The M201 Rotary Gas Meter Test has unique firmware
designed for natural gas distribution companies performing
drop tests across positive displacement (rotary vane) meters
in the field. This model uses the same pressure sensor
technology and packaging as other M2 Series products but
uses custom firmware to provide a mathematically averaged
pressure from test start to test stop. The user determines the
test duration. A number of the standard M2 Series
programming options are eliminated from the M201 firmware.
See Addendum No. 9R124-
IR “M201 Rotary Gas Meter
Tester” for unique information on model M201.