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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
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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 ............................... 8
Using the Manifold ................................................................ 9
M201 Legacy and Enhanced Comparison Table......... 10
Notes:
1. This Addendum only addresses features unique to
2. Information and specifications in this document are
model M201. Additional user instructions for those
M201 functions common to all M2 Series Smart
Manometers can be found in User’s Manual No.
9R000045, “M2 – SERIES USER MANUAL: SMART
MANOMETER / ROTARTY GAS METER TESTER”. User’s
Manual No. 9R000045 is included with M201
shipments along with Addendum No. 9R124.
subject to change without notice. Check the Meriam
web site
for latest manual revision.
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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.
M201 Legacy and Enhanced Comparison Table
Select
Legacy or
Enhanced
Mode
Measure
Mode
Test Mode
– Acquire
Data
Test
Results
Display
Test
Results
“Min/Max”
Display
Legacy Displays
No Measure Mode, only
No DP Display, no timer
Average DP Displayed
Test Min/Max above, Ave.
Standby…
DP below
NEW Enhanced
Displays
Standby with Live DP
Live DP display, internal
Test Period & Average DP
Test Min/Max above, Ave.
Display
stop watch
Displayed
DP below
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.
Meriam’s enhanced M201 has new features to improve its general
usefulness and make Rotary (Natural) Gas Meter drop tests easier.
The new Measure Mode displays differential pressure readings
while standing by for a drop test. This allows users to make
general DP measurements and provides convenient feedback on
zero performance (simultaneously pressing the “Min/Max” and
“Hold” keys takes a new zero when needed). Measure Mode also
lets users know when the M201 is correctly connected to a meter
and ready for a test to be run.
When a drop test is started, the enhanced M201 uses an internal
stop watch to time the test period. This means the technician no
longer needs to time the drop test externally, he only needs start a
test (press the “Hold” key from Measure Mode) and then stop it
(press the “Hold” key again) after one meter revolution. The M201
results screen shows the test period and average DP once the test
is stopped. To view the minimum and maximum DP measured
during the test, simply press the Min/Max key. Toggle the Min/Max
key again to return to the test time and average DP results display.
The enhanced M201 includes a Mode Select program menu for
Legacy or Enhanced modes of operation – the users chooses
which mode is best for them. See the “M201 Legacy and
Enhanced Display Comparison Table” on the last page of this
Addendum for more information.
New hardware options protect the M201 from one sided
overpressure. Options include a ¼ turn valve and an integral pushto-read cartridge valve in addition to the traditional push-to-read
valve manifold. See the Manifold Options section of this
Addendum for more details.
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Addendum No. 9R124-IR
User Interface Keys
Refer to the graphic below as reference for instructions in this
Addendum.
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. Three options
are available: a Push-To-Read (PTR) valve
manifold, an Integral Push-To-Read (IPTR)
cartridge valve and a Quarter Turn Valve
(QTV) manifold
PTR Manifold
Valve is open and DP
sensor equalized until the
ush button valve is
Instructions
1. Install preferred connectors in the 1/8” NPT (female)
connections on the M201 or M201 manifold. Use Teflon tape or
other suitable thread sealer.
2. PTR and IPTR are normally open and the M201 sensor is
equalized. The QTV valve must be manually moved to the
equalize position prior to connecting pressure to the M201.
3. Make connections to the gas meter’s HI and LO ports. Be
certain to observe the P1 (HI) and P2 (LO) on the M201.
4. Turn M201 “On”. Display should read zero since HI and LO
sides are connected and pressure is equalized. If not, re-zero
the M201 buy simultaneously pressing the Min/Max and Hold
keys.
5. To make differential pressure measurements with PTR and
IPTR options, manually depress and hold the push-to-read
valve. To make differential pressure measurements with QTR
option, manually move the ¼ turn valve to the closed position.
IPTR Cartridge Valve
Integral valve is open and DP
sensor equalized until the push
button valve is depressed
¼ Turn Valve is manually
opened to equalize DP sensor
and closed to make readin
Addendum No. 9R124-IR
June, 2010
QTV Manifold
s
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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 Display
1. Turn unit on using
the On/Off key. Unit
powers on ready to
start a drop test.
2. Press the Hold key
to start the test.
3. Press the Hold key
again to stop the test.
4. Press Min/Max key
for additional test
information if desired.
5. To start a retest,
press the Hold key.
Repeat Steps 3 & 4.
6. Press the W arrow
key.
Reads “Press Hold to Acquire
Data”.
Reads “Acquiring Data..”. No
values are displayed while
pressure values are stored.
Reads “R” for result and
“XX.XX Units” , the average
Differential Pressure (DP)
during the test period.
Top line shows Minimum and
Maximum DP value over test
period, Bottom line reads “R”
for result and “XX.XX Units”,
the average DP over the test
period
Reads “Acquiring Data..”.
Returns to Measure Mode
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 Display
1. Turn unit on using
the On/Off key.
2. Press the Prgm key. Top line reads “Program
3. Press the S arrow
key.
4. Press the X arrow
key.
5. To retain the
displayed mode, press
the Prgm key and
proceed to Step 7.
6 a. To change the
displayed Mode, press
the S or T arrow key.
6 b. To retain the
displayed mode, press
the Prgm key.
7. Press the W arrow
key.
Top line reads “ ‘Hold’ to
Test”, Bottom line displays
live Differential Pressure
value
Mode”, Bottom line reads
“Units Select”
Top line reads “Program
Mode”, Bottom line reads
“Mode Select”
Top line reads “Mode Select”,
Bottom line reads current
mode, Enhanced or Legacy
Top line reads “Program
Mode”, Bottom line reads
“Mode Select”
Top line reads “Mode Select”,
Bottom line displays the new
mode option, Legacy or
Enhanced
Top line reads “Program
Mode”, Bottom line reads
“Mode Select”
Returns to Measure Mode
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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 Display
1. Turn unit on using
the On/Off key.
2. Press the Prgm key. Top line reads “Program
3. Press the S arrow
key twice.
4. Press the X arrow
key.
5. To retain the
displayed time unit,
press the Prgm key
and proceed to Step 7.
6 a. To change the
displayed Mode, press
the S or T arrow key.
6 b. To retain the
displayed time unit,
press the Prgm key.
7. Press the W arrow
key.
Top line reads “ ‘Hold’ to
Test”, Bottom line displays
live Differential Pressure
value
Mode”, Bottom line reads
“Units Select”
Top line reads “Program
Mode”, Bottom line reads
“Time Units”
Top line reads “Time Units”,
Bottom line reads current
mode, Seconds or Minutes
Top line reads “Program
Mode”, Bottom line reads
“Mode Select”
Top line reads “Time Units”,
Bottom line displays the new
unit option, Minutes or
Seconds
Top line reads “Program
Mode”, Bottom line reads
“Time Units”
Returns to Measure Mode
Addendum No. 9R124-IR
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 Display
1. Turn unit on using
the On/Off key.
2. Press the Hold
key to start the test.
3. Allow M201 to
acquire test data per
user company’s
procedures.
4. Press the Hold
key again to stop the
test.
5. Press Min/Max
key for additional
test information if
desired.
6. To start a new
test, press the Hold
key. Repeat Steps 3
& 4
7. Press the W arrow
key.
Top line shows “ ‘Hold’ to Test”,
Bottom line displays live
Differential Pressure (DP) value
Top line shows “Acquiring
Data..”, Bottom line displays
live DP value
Top line shows “Acquiring
Data..”, Bottom line displays
live DP value
Top line shows the length of
the test in seconds or minutes,
Bottom line reads “R” for result
and shows the average DP
over the test period
Top line shows Minimum and
Maximum DP value over test
period, Bottom line reads “R”
for result and shows the
average DP over the test
period
New test is run.
Returns to Measure Mode
June, 2010
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