Addendum No. 9R124-IR June, 2010 Addendum to User’s Manual No. 9R000045 M201 Rotary Gas Meter Tester For Differential Pressure “Drop” Tests of Natural Gas Meters www.meriam.
Addendum No. 9R124-IR June, 2010 Table of Contents M201 Rotary (Natural) Gas Meter Tester ........................ 3 User Interface Keys................................................................ 4 Mode Select - Enhanced or Legacy................................... 5 Time Units Select ................................................................... 6 Enhanced Mode – Running a Drop Test.......................... 7 Legacy Mode – Running a Drop Test ...............................
Addendum No. 9R124-IR June, 2010 M201 Rotary (Natural) Gas Meter Tester Periodic differential pressure tests, or “drop” tests, on rotary natural gas meters are necessary to track meter condition. The tests indicate changes in meter performance over time and reveal when a meter should be removed from service for repair or reconditioning. “Slow” meters, those with higher differential pressure, result in under-billing and therefore cost the natural gas supplier money.
Addendum No. 9R124-IR June, 2010 User Interface Keys Refer to the graphic below as reference for instructions in this Addendum. www.meriam.
Addendum No. 9R124-IR June, 2010 Mode Select - Enhanced or Legacy The enhanced M201 (shipping since June 1, 2010), includes a Mode Select option in the program menu for Legacy or Enhanced operation. The user chooses which mode to use. See the “M201 Legacy vs. Enhanced Comparison Table” at the end of this manual addendum for a comparison of features and displays. To configure the M201 for either Legacy or Enhance mode operation, follow the steps shown on below. Keystroke 1.
Addendum No. 9R124-IR June, 2010 Time Units Select The enhanced M201 (shipping since June 1, 2010), includes a Time Unit Select option in the program menu for Enhanced Mode operation. The user chooses either seconds or minutes as the desired time unit for the results display. To the desired time unit, follow the steps shown on below. Keystroke 1. Turn unit on using the On/Off key. 2. Press the Prgm. Key. www.meriam.
Addendum No. 9R124-IR June, 2010 Enhanced Mode – Running a Drop Test The M201 Enhanced mode provides more user feedback at the display then Legacy mode does. Live pressure readings are displayed prior to and during a drop test. Upon test completion, the display shows the test period that was used along with the average differential pressure over the test period. To run an Enhanced Mode drop test on a rotary natural gas meter, follow the steps below. Keystroke 1.. Turn unit on using t On/Off key. 2..
Addendum No. 9R124-IR June, 2010 Legacy Mode – Running a Drop Test The M201 Legacy mode operates the same as the original M201 from Meriam did. Legacy mode provides the user with less information than Enhanced mode does. No live pressure readings are displayed either prior to or during the test. Upon test completion, the display shows only the average differential pressure over the test period. To run a Legacy Mode drop test on a rotary natural gas meter, follow the steps below. Keystroke 1..
Addendum No. 9R124-IR June, 2010 Using the Equalizing Manifold Options To protect the M201’s differential pressure sensor from damage due to accidental over pressure, it is importand to use the M201’s equalizing manifold correctly.
Addendum No. 9R124-IR June, 2010 6. Upon completion of use / test, release the PTR or IPTR valve, or move the QTV valve to the equalize position, to equalize pressure on the M201 sensor. Then disconnect pressure lines.
