Addendum to User’s Manual No. 9R000045
M201 Rotary Gas Meter Tester For
Differential Pressure “Drop” Tests
of Natural Gas Meters
Addendum No. 9R124-IR
June, 2010
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page 1 of 10
Addendum No. 9R124-IR
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
model M201. Additional user instructions for those
M201 functions common to all M2 Series Smart
June, 2010
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.
2.
Information and specifications in this document
are subject to change without notice. Check the
Meriam web site (www.meriam.com) for latest
manual revision.
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page 2 of 10
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.
Addendum No. 9R124-IR
June, 2010
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 push-to-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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page 3 of 10
User Interface Keys
Refer to the graphic below as reference
for instructions in this Addendum.
Addendum No. 9R124-IR
June, 2010
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page 4 of 10
Addendum No. 9R124-IR
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.
Top line reads “ ‘Hold’ to
Test”, Bottom line
displays live Differential
Pressure value
2. Press the Prgm key. Top line reads “Program
Mode,” Bottom line
reads “Unit Select”
June, 2010
3. Press the ▲ arrow
key.
4. Press the ► arrow
key.
5. To retain the display
mode, press the Prgm
key and proceed to Step
7.
6 a. To change the
displayed Mode, press
the ▲ or ▼ arrow key.
6 b. To retain the
displayed mode, press
the Prgm key.
7. Press the ◄ arrow
key.
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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page 5 of 10
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.
Top line reads “ ‘Hold’ to
Test”, Bottom line displays
live Differential Pressure
value
2. Press the Prgm. Key. Top line reads “Program
Mode”, Bottom line reads
“Units Select”
Addendum No. 9R124-IR
June, 2010
3. Press the ▲ arrow key
twice.
Top line reads “Program
Mode”, Bottom line reads
“Time Units”
4. Press the ► arrow key. Top line reads “Time
Units”, Bottom line reads
current mode, Seconds or
Minutes
5. To retain the displayed
time unit, press the Prgm
key and proceed to Step
Top line reads “Program
Mode”, Bottom line reads
“Mode Select”
7.
6 a. To change the
displayed Mode, press the
▲ or ▼ arrow key.
Top line reads “Time
Units”, Bottom line
displays the new unit
option, Minutes or
Seconds
6 B. To retain the
displayed time unit, press
the Prgm key.
Top line reads “Program
Mode”, Bottom line reads
“Time Units”
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7. Press the ◄ arrow key. Returns to Measure Mode
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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.
i
s
D
Keystroke
1.. Turn unit on using t
On/Off key.
Top line shows “ ‘Hold’ to
Test”, Bottom line displays
play
live Differential Pressure
(DP) value.
2.. Press and Hold key
start the test.
Top line shows “Acquiring
Data…”, Bottom line
displays live DP value
3.. Allow M201 to acqui
test data per user
company’s procedures.
4.. Press and Hold key aga
to stop the test.
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
5.. Press n/Max key for
additional test information if
desired.
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
6.. To start a new test, pre
New test is run
the Hold key. Repeat Steps
3 & 4.
7.. Press th ◄ arrow key. Returns to Measure Mode
Addendum No. 9R124-IR
June, 2010
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page 7 of 10
Addendum No. 9R124-IR
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.
June, 2010
eystroke
K
1.. Turn unit on using t
On/Off key. Unit powers on
Reads “Press Hold to
Acquire Data”.
Display
ready to start a drop test.
2.. Press e Hold key to
start the test.
Reads “Acquiring Data…”
No values are displayed
while pressure values are
stored.
3.. Press e Hold key
again to stop the test.
Reads “R” for result and
“XX.XX Units”, the average
Differential Pressure (DP)
during the test period.
4.. Press n/Max key for
additional test information if
desired.
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.
5.. To start a retest, pre
Reads “Acquiring Data…”
the Hold key. Repeat Steps
3 & 4.
6.. Press th ◄ arrow key. Returns to Measure Mode
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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
Addendum No. 9R124-IR
June, 2010
PTR Manifold
Valve is open and
DPVa sensor
equalized until the p
ush button valve is
IPTR Cartridge Valve
Integral valve is open
and DP sensor equalized
until the push button
valve is depressed
QTV Manifold
¼ Turn Valve is
manually opened to
equalize DP sensor and
closed to make readings
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.
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page 9 of 10
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
Addendum No. 9R124-IR
June, 2010
Select Legacy
o
r Enhanced
Mode
Mea
sure
Mode
Test Mode –
Acquire
a
Dat
T
est
Results
Display
L
egacy
Displays
No Measure Mode, only Standby…
No DP Display, no timer
Average DP Displayed
NEW Enhanced
Displays
Standby with Live DP Display
Live DP display, internal stop watch
Test Period & Average DP Displayed
est Results
T
"Min/Max"
Display
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Test Min/Max above, Ave. DP below
page 10 of 10
Test Min/Max above, Ave. DP below
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