Page 1
M2 Series
IP40
Instruction Manual 9R68-A
M202 PRECISION ABSOLUTE MANOMETER
M2 – SERIES USER MANUAL
M202
Precision Absolute Manometer
Meriam Process Technologies’ M202 Precision Absolute
Manometer is a microprocessor based pressure sensing device
used to directly measure pressure relative to absolute zero.
Models are available to measure pressure ranges up to 900mm
Hg Abs and 2000mm Hg Abs. Pressure can be displayed in a
variety of engineering units. All units include a Tare function,
a Min/Max function, selectable damp rates and altitude
displayed in feet or meters. The M202 can also display
barometric pressure corrected to sea level.
ATEX rating:
0539
Ex ia IIC T4
(Tamb. -5ºC to +50ºC)
DEMKO 06 ATEX 0615699
II 1 G
Mar, 2008
Precision Absolute Manometer
M202
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M2 Series
Instruction Manual 9R68-A
Table of Contents
User Interface ................................................................................ 3
1. Keypad Functions ............................................................... 3
ON/OFF & BACK KEY...................................................... 3
MIN/MAX & UP KEY ....................................................... 3
TARE & DOWN KEY........................................................ 3
PRGM & ENTER KEY....................................................... 4
BACKLIGHT KEY ................................................................. 4
2. Zeroing the Manometer....................................................... 5
3. Program Mode .................................................................. 10
Units Select ............................................................................ 11
Displaying Altitude (US Standard Atmosphere 1962)............ 12
Display User Defined Altitude ............................................... 12
Pressure Corrected to Sea Level............................................. 15
Damp Rate Select................................................................... 17
User Info Select...................................................................... 18
Auto Shut-Off ........................................................................ 19
Lockout Select........................................................................ 20
Header Name.......................................................................... 21
Contrast Select ....................................................................... 22
Data Logging.......................................................................... 23
Leak Test................................................................................ 24
Re-Calibration ............................................................................. 25
RE-CALIBRATION – 1 Point EDIT and START................. 27
RE-CALIBRATION – 5 Point EDIT ..................................... 28
RE-CALIBRATION – 5 Point START.................................. 29
RE-CALIBRATION – Restore Factory Defaults................... 30
Specifications .............................................................................. 31
Certification/Safety/Warnings ..................................................... 33
Changing the Batteries................................................................. 34
Contact Information..................................................................... 36
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Page 3
M2 Series
User Interface
Instruction Manual 9R68-A
Mar, 2008
Tare
1. Keypad Functions
ON/OFF & BACK KEY
Turns the manometer on and enters the unit into the Measure
Mode. Pressing the key while in the Measure Mode turns the unit
off. It also serves as a backspace key when editing in the Program
Mode. The key takes the user out of a programmable register
without changing the previous setting. Pressing this key repeatedly
will return the user to the Measure Mode and then shut off the
manometer.
MIN/MAX & UP KEY
In the Measure Mode activates the Min/Max function of the
manometer. When activated the minimum value is displayed on the
upper left of the display and the maximum value on the upper right.
This key also deactivates and resets this function. The key is
used to scroll through the programmable registers when the unit is
in the Program Mode. Once a programmable register is selected
the key can be used to edit that register.
TARE & DOWN KEY
In the Measure Mode toggles on/off the Tare function. The Tare
function is designed to set the display value to “0”. With Tare
activated, the letter “T” appears in the lower left of the display.
The key is used to scroll through programmable registers with
the unit in the Program Mode. Once a programmable register is
selected the key can be used to edit that register.
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M2 Series
Instruction Manual 9R68-A
PRGM & ENTER KEY
Puts the manometer into the Program Mode from the Measure
Mode. When in the Program Mode, pressing this key selects the
programmable register to be edited (with prompt for password if
Lockout is set). After the register has been edited, pressing the
PRGM key enters the new setting into the manometer’s nonvolatile memory. This key also acts as a forward space key
when editing user input such as the header name and user units.
BACKLIGHT KEY
The BACKLIGHT key, represented by the standard light bulb
symbol, toggles the display backlight between green and off.
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M2 Series
Instruction Manual 9R68-A
2. Zeroing the Manometer
The M202 Precision Smart Manometer is a stable and precise
instrument. However, on occasion the M202 should have a new
zero taken. This is done to remove zero drift that can occur since
the manometer was last zeroed. The M202 can be zeroed only if
the new applied zero is within ± 1% FS of the original factory
calibration zero. This prevents accidental zeroing at atmospheric
pressure or other relatively high pressures. If outside this limit a
“ZERO RANGE ERROR” message appears and the manometer
will not zero.
The M202 provides three mechanisms for re-zeroing:
1. Referenced to Absolute Zero: This traditional and
preferred method takes a “snapshot” of the measured pressure
when a vacuum of less than 100 microns Absolute is applied
to the sensor.
2. Factory Zero: This method restores the calibration curve to
the original zero taken at the factory. Note that this feature is
intended for comparison purposes, and should not be used for
real pressure measurement, as any zero-drift will not be
compensated.
3. User-Adjusted Zero: This method allows the user to enter
any pressure value when a known reference is applied (for
example, the local barometer). The manometer will compare
its actual measured value with the entered value, and calculate
a new zero reference based on the offset.
1. To zero the manometer using Referenced to Absolute
Zero, start with the unit turned OFF and use the following
keystroke sequence:
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M2 Series
Instruction Manual 9R68-A
Mar, 2008
Keystroke Display
1. Press ON/OF button. The display briefly shows
2. Connect the 355 to a
vacuum source capable
of a vacuum of 100
microns absolute
pressure or less.
3. Pull a full vacuum. Display should read close to
4. Press MIN/MAX and
TARE keys at the same
time. (See figure 1
below.)
5. Press the PRGM key. Top line of display reads
the header name and full
scale range of the unit in the
last engineering units
selected. The manometer
then goes into the Measure
Mode where the applied
pressure and engineering
unit of measure are
displayed.
zero. (See note on next
page)
Top line of display reads
“ZEROING SOURCE:”
Bottom line of display reads
“REF TO ABS ZERO”
“ZERO IN PROGRESS”
while bottom line counts
down from 9. Zeroing is
complete when unit returns
to Measure Mode.
Figure 1
Tare
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M2 Series
2. To zero the manometer using Factory Zero, start with the
unit turn ON and in Measure Mode and use the following
keystroke sequence:
Keystroke Display
Instruction Manual 9R68-A
Mar, 2008
1. Press MIN/MAX and
TARE keys at the
same time. (See
figure 1 above.)
2. Press or arrow
key until desired zero
function is shown on
the bottom line.
3. Press the PRGM key.
NOTE: The M202 can be zeroed only if the new applied zero
is within ± 1% FS of the original factory calibration zero. If
outside this limit a “ZERO RANGE ERROR” message
appears and the manometer will not zero. Contact the factory
for support in this case.
3. To zero the manometer using User-Adjusted Zero, start
with the unit turn ON and in Measure Mode and use the
following keystroke sequence:
Top line of display reads
“ZEROING SOURCE:”
Bottom line of display
reads “REF TO ABS
ZERO”
Bottom line of display
reads “FACTORY ZERO”
Zeroing is complete when
unit returns to Measure
Mode.
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M2 Series
Instruction Manual 9R68-A
Mar, 2008
Keystroke Display
1. Apply a known,
accurate pressure
source. This may be
true atmospheric
pressure, with known
reference defined by a
local barometer.
2. Press MIN/MAX and
TARE keys at the
same time. (See
figure 1 above.)
3. Press or arrow
key until desired zero
function is shown on
the bottom line.
4. Press the PRGM key. Top line of display shows
5. Press any of or
arrow key or the
PRGM key to begin
editing.
Example: set current
pressure value to 29.5
In Hg @ 0º C.
Top line of display reads
“ZEROING SOURCE:”
Bottom line of display
reads “REF TO ABS
ZERO”
Bottom line of display
reads “USER ADJ.
ZERO”
the current non-zero
compensated pressure
value. Bottom line of
display shows the same
value, along with the
engineering unit.
Top line of display
continuously updates.
Bottom line of display data
is frozen, and the first digit
is blinking.
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M2 Series
6. Press the or
arrow key to set the
first digit to 0.
Instruction Manual 9R68-A
Mar, 2008
Current: xxx.xx
0xx.xx INHG
Using the UP arrow
key the character
sequence is 0 - 9, (-)
negative, (.) decimal
point. The (-) sign is
used if your location
is below sea level.
7. When the digit is
correct press the
PRGM key.
If an error is made use
the back space key
to move the cursor
back to the incorrect
digit. Press the UP
or DOWN arrow
keys to display the
correct value.
8. Continue this process
until the display reads
as shown at right.
9. Press the PRGM key
to enter the final
digit.
Note that the User Adjusted Zero feature will not accept
entries in altitude units (FEET or METERS). When the current
engineering unit is FEET, the User Adjusted Zero function
will automatically prompt for an entry in Inches of Mercury @
0º C. When the current engineering unit is METERS, the User
Adjusted Zero function will automatically prompt for an entry
in Millimeters of Mercury @ 0º C.
Cursor flashes to the right
of “0”.
Current: xxx.xx
029.50 INHG
Zeroing is complete when
unit returns to Measure
Mode.
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Page 10
M2 Series
Instruction Manual 9R68-A
3. Program Mode
The program mode is used to configure the manometer for
Measure Mode operation. After the PRGM key is pressed in
Measure Mode, the top line of the display reads “PROGRAM
MODE”. The bottom line reads “UNITS SELECT”. Press the or
arrow keys to scroll through the Program Mode to the desired
register. The configurable registers found in the Program Mode
are Units Select, Damp Rate Select, User Info Select, Contrast
Select, Sea Level Select, Data Logging, Leak Test and Exit.
Press the PRGM key to select any of these configurable registers.
The manometer can be put into Program Mode at any time during
Measure Mode operation by pressing the PRGM key. If Lockout
is set, the correct code must be entered when prompted (see the
User Info / Lockout section of this manual for more information on
Lockout).
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Instruction Manual 9R68-A
Units Select
The standard engineering units available on the M202 Precision
Absolute Manometer are:
Inches of Mercury at 0° C (in Hg @ 0° C)
Millimeters of Mercury at 0° C (mm Hg @ 0° C)
PSI
kPa
mbars
Bars
Torr
Feet (Altitude displays)
Meters (Altitude displays)
To change the engineering units the manometer should be “ON”
and in Measure Mode. Then follow these steps:
Keystroke Display
1. Press the PRGM key. Top line reads “PROGRAM
2. Press the PRGM key. Top line reads “UNITS
3. Press the or arrow
key until desired engineering unit is displayed.
4. Press the PRGM key to
select the engineering unit.
5. Press the arrow key. Bottom line reads “EXIT”.
6. Press the PRGM key. Display returns to Measure Mode
MODE” and bottom line reads
“UNITS SELECT”.
SELECT” and bottom line shows
current engineering units.
Engineering units on bottom line
of display change.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
in new engineering unit.
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Page 12
M2 Series
Instruction Manual 9R68-A
Displaying Altitude (US Standard Atmosphere 1962)
The model M202 is capable of displaying altitude in feet or meters
based on U.S. Standard Atmosphere1962 tables. To set the M202
to read out referenced to this altitude standard use the following
steps:
Keystroke Display
1. Press the PRGM key. Top line reads “PROGRAM
2. Press the PRGM key. Top line reads “UNITS
3. Press the or arrow
key until “USER UNIT
SELECT” is displayed.
4. Press the PRGM key. Top line reads “ALTITUDE
5. Press the PRGM key. Top line reads “PROGRAM
6. Press the key. Manometer returns to Measure
Display User Defined Altitude
User Defined Altitude is useful in determining elevation change
from a map elevation reference or from a survey trig marker
elevation. To set up the M202 to display altitude based on user
entered information, use the following steps:
Keystroke Display
1. Press the PRGM key. Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
SELECT” and bottom line shows
current engineering unit.
Top line reads “UNITS
SELECT”
Bottom line reads “FEET or
METERS”.
SELECT”. Bottom line reads
“STANDARD”.
MODE” and bottom line reads
“UNITS SELECT”.
Mode. Displays altitude
referenced to US Standard
Atmosphere 1962.
MODE” and bottom line reads
“UNITS SELECT”.
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M2 Series
Instruction Manual 9R68-A
2. Press the PRGM key. Top line reads “UNITS
3. Press the or arrow
key until “USER UNIT
SELECT” is displayed.
4. Press the PRGM key. Top line reads “ALTITUDE
5. Press the arrow key
once.
6. Press the PRGM key. Top line reads “VALUE=:
7. If the value shown in
step 6 is the correct
altitude, press the PRGM
key to accept and the
key to return to Measure
Mode.
If the value shown in step
6 is not the correct
altitude, press the key
8. Press the PRGM key.
Example: set altitude to
685 feet above sea level.
9. Press the or keys
to set the first digit to “6”.
Using the key the
provides the character
sequence 0 - 9, ( - )
negative, and (.) decimal
point. The ( - ) sign is used
if your location is below
sea level.
- OR -
SELECT” and bottom line shows
current engineering unit.
Top line reads “UNITS
SELECT”
Bottom line reads “FEET or
METERS”.
SELECT”. Bottom line reads
“STANDARD”.
Top line reads “ALTITUDE
SELECT”. Bottom line reads
“REF. TO USER”.
00000000”. Bottom line reads
“CHANGE?: NO”.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
Top line reads “VALUE=:
00000000”. Bottom line reads
“CHANGE?: YES”.
Top line reads “USER MODEFEET”. Bottom line reads
“00000000”.
Top line reads “USER MODEFEET”. Bottom line reads
“60000000”.
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M2 Series
Instruction Manual 9R68-A
10. When the digit is
correct press the PRGM
key.
If an error is made use the
back space key to move
the cursor back to the
incorrect digit. Press the
or arrow keys to
display the correct value.
11. Continue the process
until the display reads as
shown at right.
12. Press the PRGM key
to enter the final value.
13. Press the key to
return to Measure Mode.
To set the unit to read in meters, select METERS from the UNITS
SELECT menu. Then follow the same steps as outlined above.
Because the local barometer varies with weather conditions, the
USER DEFINED ALTITUDE must be reentered each time the
M202 is to be used in this mode. To adjust the unit to the current
barometric pressure without changing the base altitude, select
“NO” in step 6 in the table above by pressing the PRGM key. The
M202 will display the current altitude referenced to prevailing
local barometric pressure. To maximize accuracy the local altitude
should be reset whenever better altitude information is available.
Cursor flashes to the right of the
“6”. Example: “60
Top line reads “USER MODEFEET”. Bottom line reads
“685.0000”.
Top line reads “PROGRAM
MODE”. Bottom line reads
“UNITS SELECT”.
Top line reads “altitude
referenced to 685”. Bottom line
reads “U 685 FEET”.
000000”.
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Page 15
M2 Series
Pressure Corrected to Sea Level
Pressure reduction to Sea Level is required so that barometric
readings can be compared at different elevations. The correction to
sea level is done using a “hypsometric equation”. This equation
simulates a “fictitious column of air” which extends downward
from the instruments location to sea level. This fictitious column is
assumed to be similar to the actual air column over nearby lower
elevations. Some properties are related to observed conditions
while others must be assumed. Barometric pressures given by the
National Weather Service and used at airports are always corrected
to sea level.
To set the unit to display pressure corrected to sea level:
Keystroke Display
1. Determine the elevation of
the instrument above sea
level, in meters. 700 meters
will be used as an example.
2. From Measure Mode press
the PRGM key.
3. Press the key 4
times.
4. Press the PRGM key. Top line reads “SEA LEVEL
5. Press the or key
to indicate the correction
to sea level status.
6. To turn on the correction,
set ENABLED on the 2
line & press the PRGM key.
-OR-
To turn off the correction, set
DISABLED on the 2
and skip ahead to step 12 .
nd
nd
line
Instruction Manual 9R68-A
Mar, 2008
Top line reads “PROGRAM
MODE”. Bottom line reads
“UNITS SELECT”.
Top line reads “PROGRAM
MODE”. Bottom line reads
“SEA LEVEL SELECT”.
SELECT”. Bottom line reads
either “ENABLE” or
“DISABLED”.
Bottom line toggles between
“ENABLE” and
“DISABLED”.
Top line reads “VALUE=:
00000000”. Bottom line reads
“CHANGE?: NO”.
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M2 Series
Instruction Manual 9R68-A
7. To change the value press
the key to toggle the
display to “YES”.
8. Press the PRGM key. Top line reads “SEA LEVEL
9. Press the or arrow
keys to set the correct value
in the first digit.
10. When the value is correct
press the PRGM key.
11. Repeat steps 9 and 10
above until the correct
elevation is entered.
12. Press the PRGM key to
continue moving the cursor
to the right. When the last
digit is entered the unit will
leave the sea level select
mode and return to the
Program Mode.
13. Press the key. The
display will return to the
Measure Mode. When the
Correction to Sea Level is
ENABLED, the display will
have the letter “S” at the
beginning of the 2
nd
line.
Top line reads “VALUE=:
00000000”. Bottom line reads
“CHANGE?: YES”.
METERS”. Bottom line reads
0000000”.
“0
Top line reads “SEA LEVEL
METERS”. Bottom line reads
“7
0000000”.
Cursor moves over to the next
digit.
Top line reads “SEA LEVEL
METERS”. Bottom line reads
“7
00.0000”.
Top line reads “PROGRAM
MODE”. Bottom line reads
“UNITS SELECT”.
Display reads;
“S 803.1 TORR”
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Page 17
M2 Series
Instruction Manual 9R68-A
Damp Rate Select
Adjustable exponential type damping is available to steady the
display when measuring pulsating pressures. The M202 has a range
of damping rates; 0.1, 0.2, 0.5, 1, 2, 5, 10, or 25 seconds. Damping
is done by averaging new data from the pressure sensor against
previously collected data. The microprocessor collects data from
the sensor every 0.1 seconds. The display updates every 0.5
seconds, showing the current 0.1 second pressure reading. When set
at 25 seconds, the display updates every 0.5 seconds with the
average of the previous 25 seconds readings. Therefore, it takes up
to 25 seconds from the time pressure is applied until the manometer
displays the full scale applied pressure. Min/Max display updates
every 0.1 seconds.
To set the damp rate:
Keystroke Display
1. Enter Program Mode by
pressing the PRGM key.
2. Press the key.
3. Press the PRGM key. Top line reads “DAMP RATE
4. Press the or keys
until the desire damp rate is
displayed on the bottom line.
5. Press the PRGM key. Top line reads “PROGRAM
6. Press the key.
7. Press the PRGM key. Returns to Measure Mode.
Top line reads “PROGRAM
MODE”. Bottom line reads
“UNITS SELECT”.
Bottom line reads “DAMP
RATE SELECT”.
SELECT”. Bottom line shows
current value.
Bottom line shows damp rate
settings in seconds.
MODE”. Bottom line reads
“UNITS SELECT”.
Bottom line reads “EXIT”.
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Page 18
M2 Series
Instruction Manual 9R68-A
User Info Select
The User Info Select registers are designed to provide the user with
information on the hardware and software in the manometer. This
register provides read only information on the sensor’s serial
number, software version and date of manufacture. It also allows
the user to edit the Auto Shut-Off, Lockout and Start-Up Header
Name features.
To access the User Info Select registers, follow the steps below. To
configure a User Info Select register, follow the steps shown on the
following page.
Keystroke Display
1. From the Measure Mode
press the PRGM key.
2. Press the arrow key
twice
3. Press the PRGM key. Bottom line shows serial
4. Press the arrow key. Software version number
5. Press the arrow key. Manufacture date shown.
6. Press the arrow key.
See instructions to set
AUTO SHUT-OFF later in
this manual.
7. Press the arrow key.
See instructions for using
LOCKOUT later in this
manual.
8. Press the arrow key.
See instructions for editing
the Header later in this
manual.
9. Press the arrow key to
go back to “USER INFO
SELECT” screen.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
Bottom line changes to “USER
INFO SELECT”.
number.
shown.
Top line reads “AUTO SHUT
OFF” and bottom line reads
“ENTER TO SELECT”.
Top line reads “LOCKOUT
CODE” and bottom line reads
“ENTER TO SELECT”.
Top line reads “HEADER
NAME” and bottom line reads
“MERIAM”. The cursor flashes
at bottom left.
Top line reads “PROGRAM
MODE” and bottom line reads
“USER INFO SELECT”.
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Page 19
M2 Series
Instruction Manual 9R68-A
Auto Shut-Off
Enabling the Auto Shut-Off feature allows the manometer to turn
itself off after a user selected period of keypad inactivity.
Selectable options include DISABLED, 10 Minutes (which is the
factory shipped default), 20 Minutes, 30 Minutes, 45 Minutes and
60 Minutes. Disabling this feature limits the manometer to being
turned off by using the ON/OFF key only.
To configure auto shut-off follow these steps:
1. Follow steps 1-6 in the
User Info Select table.
2. Press the PRGM key,
then the up or down
arrow keys until the
desired shut-off time is
shown.
3. Press the PRGM key. Desired Auto Shut-Off time is
4. Press the left arrow key
twice.
Note: The “Auto Shut-Off” timer is suspended during Data
Logging and Leak Test sessions to prevent accidental loss of
information. Auto Shut-Off is re-instated after completion of DataLogging or Leak Test sessions.
Keystroke Display
Top line reads “AUTO SHUTOFF” and bottom line reads
“ENTER TO SELECT”.
Top line reads “AUTO SHUTOFF” and bottom line toggles to
“DISABLED”, “10”, “20”, “30”,
“45” and “60” minutes .
selected, top line reads “AUTO
SHUT-OFF” and bottom line
reads “ENTER TO SELECT”.
Returns to Measure Mode.
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Page 20
M2 Series
Instruction Manual 9R68-A
Lockout Select
Enabling the Lockout feature prevents unauthorized users from
making changes to the configuration of the manometer. To enter
the Program Mode, the user must first enter the “password” (twodigit Lockout Code) within approximately 40 seconds when
prompted. Failure to enter the correct two digit code within
approximately 40 seconds will return the unit to Measure Mode.
Any two-digit numeric code can be programmed. The factory
Lockout Code of 00 (which is the default as shipped from the
factory) disables the Lockout.
To set the Lockout Code follow these steps:
Keystroke Display
1. From the Measure
Mode press the PRGM
key. If the Lockout is set,
enter the correct
“password” when
prompted.
2. Press the up arrow key
twice.
3. Press the right arrow
key then the up arrow key
four times.
4. Press the right arrow
key, then press the up or
down arrow keys to
change the first digit.
Press the right arrow key
to proceed.
5. Press the right arrow
key when the desired code
is set. Lockout is
activated.
6. Press the left arrow key
twice.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
Bottom line reads “USER INFO
SELECT”.
Top line reads “LOCKOUT
CODE” and bottom line reads
“ENTER TO SELECT”.
Bottom line shows the old
Lockout Code. The cursor flashes
at the first position while the
value is changed, the cursor
moves to the right position once
the right arrow key is pressed.
Top line reads “LOCKOUT
CODE” and bottom line reads
“ENTER TO SELECT”.
Returns to Measure Mode.
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Page 21
M2 Series
Instruction Manual 9R68-A
Header Name
Follow the steps below to edit the Header Name.
Keystroke Display
1. From the Measure Mode
press the PRGM key.
2. Press the up arrow key
twice.
3. Press the PRGM key. Bottom line shows serial
4. Press the up arrow key
five times.
5. If header is correct press
backspace key. If editing is
desired proceed to step 7.
6. Press the left arrow key. Returns to Measure Mode.
7. Press the up or down
arrow keys to set the
correct alpha-numeric
value.
8. Press the right arrow key
to accept entry.
9. Repeat steps 8 and 9
until the desired Header is
shown.
10. If an error is made press
the back arrow key until the
cursor is over the incorrect
value. Follow step 8 to
correct. Press the right
arrow key to advance the
cursor without changing
values.
11. When the Header is
complete press the PRGM
key until header accepted.
12. Press the left arrow key. Returns to Measure Mode.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
Bottom line changes to “USER
INFO SELECT”.
number.
Top line reads “HEADER
NAME” and bottom line reads
“MERIAM”. The cursor flashes
at bottom left.
Top line reads “PROGRAM
MODE” and bottom line reads
“USER INFO SELECT”.
Displays a number between 0
and 9, a letter from A to Z, / or a
blank space.
Cursor advances one space to
right.
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
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Page 22
M2 Series
Contrast Select
The Contrast Select register allows the user to adjust the character
contrast of the LCD display to provide the best visibility for the
ambient light conditions.
To adjust the contrast, follow these steps:
Keystroke Display
1. From the Measure Mode
press the PRGM key.
2. Press the key three
times.
3. Press the PRGM key. Top line reads “CONTRAST
4. Press the or keys to
increase or decrease the
contrast value. A low
number gives maximum
contrast and a high number
gives minimum contrast.
5. Press the PRGM key. Top line reads “PROGRAM
6. Press the key. Returns to Measure Mode.
If an error is made during the contrast adjustment, pressing the key
returns the display to the previous contrast setting.
Instruction Manual 9R68-A
Mar, 2008
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
Bottom line reads
“CONTRAST SELECT”.
SELECT”. Bottom line shows a
numerical value.
LCD lightens or darkens
depending on the value set.
MODE” and bottom line reads
“UNITS SELECT”.
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page 22 of 36
Page 23
M2 Series
Instruction Manual 9R68-A
Data Logging
Data Logging can be used to record pressure measurements. Two
record modes are supported: automatic and manual. In automatic
mode, a pressure value is captured every 5 seconds for 20 minutes,
resulting in 240 stored values. In manual mode, a pressure value is
captured each time the PRGM key is pressed up to 240 values. The
data collected during a logging session can be viewed upon
completion.
1. From the Measure Mode
press the PRGM key.
2. Press the up arrow key
four times.
3. Press the PRGM key. Top line reads “DATA
4. Press the PRGM key. Top line reads “RECORD
5. Press the PRGM key at
AUTO to start automatic
logging or at MANUAL to
start manual logging mode.
6. To stop recording values
at any time, press the key.
7. To access recorded
values, press the key.
8. To view recorded values,
press the PRGM key.
9. Press the key 3 times. Returns to Measure Mode.
The “Auto Shut-Off” timer is disabled for Data Logging sessions.
Be sure to end the session to re-enable the Auto Shut-Off timer.
Keystroke Display
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
Bottom line reads “DATA
LOGGING”.
LOGGING” and bottom line
reads “RECORD”.
MODE” and bottom line reads
“AUTO” or “MANUAL”.
Top line reads
“RECORDING X” and
bottom line reads “XX.XX
UNITS”. AUTO records value
every 5 seconds. Manual
records value each time PRGM
key is pressed.
Top line reads “DATA
LOGGING” and bottom line
reads “RECORD”.
Top line reads “DATA
LOGGING” and bottom line
reads “VIEW”.
Top line reads “DATA LOG:
1” and bottom line displays
the value. Continue pressing
the key to view all values.
Mar, 2008
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page 23 of 36
Page 24
M2 Series
Leak Test
The Leak Test feature allows the user to determine the leak rate in
the pneumatic system being monitored. Once configured, Leak
Test monitors the measured pressure over time and displays the
leak rate in the pressure units per minute at the conclusion of the
test. The maximum configurable leak test period is 1440 min (1
day). Pressing any key during the leak test will abort the test.
To enable Leak Test follow these steps:
Keystroke Display
1. From the Measure Mode
press the PRGM key.
2. Press the down arrow key
twice.
3. Press the PRGM key. Top line reads “LEAK TEST”
4. Press the PRGM key. Top line reads “Leak Test
5. Use the up, down & right
keys to input test period
6. Press the PRGM key. Top line reads “LEAK TEST”
7. Press the up arrow key
once.
8. Press the PRGM key.
The “Auto Shut-Off” timer is disabled for Leak Test sessions. Be sure to end
the session to re-enable the Auto Shut-Off timer.
Instruction Manual 9R68-A
Mar, 2008
Top line reads “PROGRAM
MODE” and bottom line reads
“UNITS SELECT”.
Bottom line reads “LEAK
TEST”
and bottom line reads
“CONFIGURE”.
Period” & bottom “X.X MIN”.
Bottom line reads desired
period; Ex. “ 20.0 MIN”.
and bottom line reads
“CONFIGURE”.
Top line reads “LEAK TEST”
and bottom line reads “PRGM
TO START”.
Top line displays MIN/MAX
pressure values at left/right.
Bottom line reads the current
pressure value and units.
At end of test period, top line
displays the leak rate in units
per minute. Bottom line shows
the current pressure reading.
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page 24 of 36
Page 25
M2 Series
Instruction Manual 9R68-A
Re-Calibration
The Manometer can be re-calibrated in the field for zero, span, and
linearity. The proper primary standards must be available prior to
calibrating the Manometer. These standards should meet the
accuracy requirements for your company or industry. Meriam
Process Technologies follows the guidelines established by ANSI /
NCSL Z540-1-1994 which requires that the primary standard be 4
times more accurate than the unit under test.
The re-calibration is not
Calibration Procedure. It is intended to correct the curve fit if the
actual sensor characteristics change slightly over time.
For sensors up to 200 PSI, Meriam recommends a ±0.0015% of
reading deadweight tester. For sensors 200 PSI and above, a
±0.0030% of reading deadweight tester is recommended. If
calibrating using inches of water units, be sure to match the
reference temperature of water in both the unit under test and the
M2.
1-point (within upper 50% of Full Scale), 5-point (nominal values
of 0%, 25%, 50%, 75% & 100% of Full Scale), and restore factory
default re-calibration options are offered. For the 5-Point recalibration, points 2, 3 and 4 can be adjusted within ±1% of
reading around the nominal values. Point #5 can be adjusted within
-1% of reading around nominal. Point #1 is fixed.
For example: for a 2000 inH2O sensor, Point # 2 (25%) can be
edited form 495 to 505 inH2O. Point #5 (100%) can be edited
from 1980 to 2000 inH2O.
The unit can only be re-calibrated if the calibration points are
within 5 times the accuracy of the original factory calibration (e.g.
@ 0.05% accuracy, the point limit is ±0.25% of Full Scale). If the
re-calibration procedure generates a new value outside this limit
the procedure will fail. In this case the unit would need to be
returned to the factory for service.
intended to replace the Factory Lab
Mar, 2008
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page 25 of 36
Page 26
M2 Series
Instruction Manual 9R68-A
Once a re-calibration has been performed (either 1-point or 5point) the unit will continue to allow future re-calibrations only
with that type of re-calibration. In order to enable the other recalibration type, the user must first restore the re-calibration data to
the factory defaults.
Mar, 2008
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page 26 of 36
Page 27
M2 Series
Instruction Manual 9R68-A
RE-CALIBRATION – 1 Point EDIT and START
To perform a 1-point re-calibration, apply a pressure between 50%
and 100% of Full Scale and then follow these steps:
Keystroke Display
1. With unit OFF, press and
hold the MIN/MAX key,
turn the unit on by pressing
the ON/OFF key, then
release MIN/MAX.
2. Press the up arrow key
until “START” is displayed
on the bottom line.
3. Press the PRGM key. Top line reads “RE-CAL
4. Press the PRGM key. Top line reads “CAL POINT”
5. Press the up/down arrow
keys to edit the selected
digit. Use the left/right arrow
keys to change the cursor
position. Value entered must
be 50-100% of FS.
6. Press the right arrow key
while on the right most digit
to proceed.
7. Apply the input pressure
indicated using an
appropriate reference
standard; press PRGM key.
8. Press the left arrow key. Returns to Measure Mode
Top line reads “RE-CAL”.
Bottom line reads “EDIT”.
Top line reads “RE-CAL”.
Bottom line reads “START”.
START”.
Bottom line reads “1-POINT”.
and bottom line displays the
cal point value.
Bottom line displays the cal
point value. The cursor flashes
at the first position while the
value is changed, then moves
to the right position when the
right arrow key is pressed.
Top line reads “APPLY:”
Bottom line displays the “CAL
POINT” value.
Top line reads “RE-CAL”.
Bottom line reads “START”,
Manometer has been
recalibrated.
Mar, 2008
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page 27 of 36
Page 28
M2 Series
RE-CALIBRATION – 5 Point EDIT
To edit the calibration points for a 5 Point re-calibration follow the
steps below.
NOTE: If the factory default values are acceptable, skip this
section and proceed to the re-calibration 5-Point START procedure.
Keystroke Display
1. With unit OFF, press and
hold the MIN/MAX key,
turn the unit on using the
ON/OFF key, then release
2. Press the PRGM key. Top line reads “CAL POINT
3. Press the up/down arrow
keys to edit the selected
digit. Use the left/right
arrow keys to change the
cursor position.
0% go directly to step 4.
4. Press the right arrow key
while on the right most digit
to proceed.
5. Repeat steps 3 and 4 for
CAL POINTS 2, 3, 4 and 5.
6. After editing CAL
POINT 5 press the right
arrow key while on the right
most digit to proceed.
7. To perform the 5-point
re-cal, press the up arrow
key until START is
displayed on the bottom
line.
OR
To exit without performing
the 5-point re-cal press the
left arrow key
Note: For
Instruction Manual 9R68-A
Mar, 2008
Top line reads “RE-CAL”.
Bottom line reads “EDIT”.
1”. Bottom line displays the
cal point value.
Bottom line displays the cal
point value. The cursor flashes
at the first position while the
value is changed, then moves
to the right position when the
right arrow key is pressed.
Top line reads “CAL POINT
2”. Bottom line displays the
cal point value.
Top line reads “CAL POINT
2/3/4/5”. Bottom line displays
the cal point value.
Top line reads “RE-CAL”.
Bottom line reads “EDIT”.
Top line reads “RE-CAL”.
Bottom line, “START”.
Continue with 5-Point Recalibration procedure at step 3
on next page.
OR
Returns to Measure Mode.
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page 28 of 36
Page 29
M2 Series
Instruction Manual 9R68-A
RE-CALIBRATION – 5 Point START
To begin the 5-point re-calibration procedure, turn the unit OFF
and follow the steps below.
Keystroke Display
1. Press and hold the
MIN/MAX key and turn the
unit on by pressing the
ON/OFF key.
2. Press the up arrow key
until “START” is displayed
on the bottom line.
3. Press the PRGM key. Top line reads “RE-CAL
4. Press the up arrow key
until “5-POINT” is
displayed on the bottom
line.
5. Press the PRGM key. Top line reads “POINT 1 –
6. Vent P1 and P2 ports to
atmosphere and
simultaneously press the
MIN/MAX and HOLD
keys, then release.
7. Press the right arrow key
while on the right most
digit to proceed.
8. Apply the indicated
calibration point pressure
using external pressure
standards. After pressure is
stable, press the right arrow
key.
9. Repeat step 8 for CAL
POINTS 4 and 5.
Top line reads “RE-CAL”.
Bottom line reads “EDIT”.
Top line reads “RE-CAL”.
Bottom line reads “START”.
Bottom line reads “1-POINT”.
Top line reads “RE-CAL
START”.
Bottom line reads “5-POINT”.
ZERO:”
Bottom line displays live
applied pressure.
Unit takes new zero. Top line
reads “ POINT 1 - ZERO:”
Bottom line displays live
applied pressure. POINT 1 has
been taken.
Top line reads “POINT 2 APPLY:”.
Bottom line displays the cal
point value to apply.
Top line reads “POINT 3 APPLY:”.
Bottom line displays the cal
point value to apply.
Top line reads “POINT 4/5 APPLY”
Bottom line displays the cal
point value.
Mar, 2008
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page 29 of 36
Page 30
M2 Series
Instruction Manual 9R68-A
10. Use up or down arrow
keys to select NO or YES
when asked “Save?” the
Re-Calibration data.
11. Press the PRGM key at
YES to save the ReCalibration data or at NO to
exit without saving.
12. Press the left arrow key. Returns to Measure Mode.
RE-CALIBRATION – Restore Factory Defaults
To restore the re-calibration data to the factory defaults, follow
these steps:
Keystroke Display
1. With unit OFF, press and
hold the MIN/MAX key,
turn the unit on using the
ON/OFF key, then release.
2. Press the up arrow key
twice.
3. Press the PRGM key. Top line reads “RESTORE
4. Use the up and down
arrow keys to select YES or
NO when asked to restore
defaults.
5. Press the PRGM key at
YES to restore the Factory
Default Calibration data or
at NO to exit without
restoring.
6. Press the left arrow key. Returns to Measure Mode.
Top line reads “SAVE?”.
Bottom line reads “NO” or
“YES”.
Top line reads “RE-CAL”.
Bottom line reads “START”.
Re-cal is complete.
Top line reads “RE-CAL”.
Bottom line reads “EDIT”.
Top line reads “RE-CAL”.
Bottom line reads “RESTORE
DEFAULTS”.
DEFAULTS”.
Bottom reads “YES” or “NO”.
Top line reads “RESTORE
DEFAULTS”.
Bottom reads “YES” or “NO”.
Top line reads “RE-CAL”.
Bottom line reads “RESTORE
DEFAULTS”. Factory
defaults have been restored.
Mar, 2008
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page 30 of 36
Page 31
M2 Series
Instruction Manual 9R68-A
Specifications
Type, Range and Display Resolution:
Absolute Isolated (AI) Type:
17 psia (900 mmHg) – XXX.YY
38 psia (2000 mmHg) – XXX.YY
Accuracy:
M202-AI0017: ±0.02 % F.S. (F.S. = 900 mm Hg)
M202-AI0038: ±0.015 % F.S.* from 0-1000 mm Hg
±0.025% F.S.* from 1000-2000 mm Hg
*F.S. = 2000 mm Hg Absolute
Includes the combined effects of temperature, linearity,
repeatability, hysteresis and resolution.
Warm up time = 5 minutes.
Temperature:
Storage = -40°C to +60°C (-40°F to +140°F)
Operating = -5°C to +50°C (23°F to +122°F)
Media Compatibility:
AI: Absolute pressure sensors for use with gases and liquids
compatible with 316L SS
Pressure Limits:
AI units: 77 PSIA (4000 mm Hg Abs)
Connection:
1/8” female NPT, 316L SS. P1 is the pressure connection.
P2 is not accessible (factory plugged with metal disc)
Mar, 2008
User must use a wrench on the pressure manifold when
installing user’s 1/8” NPT fitting. Do not tighten the
fitting without using a wrench on the pressure
manifold. Failure to use a wrench on the manifold will
damage the plastic enclosure and void warranty No
torque should be applied to the manifold with respect
to plastic enclosure.
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Page 32
M2 Series
Instruction Manual 9R68-A
Battery Type:
4 each AA alkaline batteries.
IMPORTANT!!! ATEX certified models require the use
of approved batteries only to maintain the ATEX
certification. Refer to Drawing. No. 9R000056 “M2
Intrinsically Safe Control Document” for a list of
batteries approved for hazardous atmospheres. A copy of
this drawing accompanies each unit shipped.
Remove and / or replace batteries in non-hazardous
areas only.
Battery Operation:
>100 hours continuous use, 1 year shelf life, auto power off
programmable at Disabled, 10, 20, 30, 60 or 90 minutes
Enclosure: (6.9” × 3.8” × 2.3”) Polycarbonate, Permanently
Static Dissipative, ESD Protection
Enclosure with Boot: (7.2” × 4.2” × 2.5”)
Mar, 2008
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Page 33
M2 Series
Instruction Manual 9R68-A
Certification/Safety/Warnings
The following defines the certification and area classification of
the Manometer product.
Mar, 2008
Note the following WARNINGS and requirements:
• Substitution of components may impair Intrinsic Safety
• To prevent ignition of flammable or explosive atmospheres,
disconnect power before servicing.
• To prevent ignition of flammable or explosive atmospheres,
DO NOT open or service unit, including battery
compartment, in flammable or explosive atmosphere
DO NOT rub, clean or wipe the surface of the
membrane keypad as it may build a static charge
DO NOT mix old batteries with new or mix
batteries from different manufacturers
DO NOT replace batteries in explosive or
hazardous atmosphere
DO NOT use any battery type other than those
listed on Drawing. No. 9R000056 “M2 Intrinsically
Safe Control Document”.
• User must use a wrench on the pressure manifold when
installing user’s 1/8” NPT fitting. Do not tighten the fitting
without using a wrench on the pressure manifold. Failure to
use a wrench on the manifold will damage the plastic
enclosure and void warranty No torque should be applied to
the manifold with respect to plastic enclosure.
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page 33 of 36
Page 34
M2 Series
Instruction Manual 9R68-A
Changing the Batteries
Adherence to the Specifications and Certification/Safety/Warnings
sections of this manual shall be enforced when changing batteries.
The manometer is powered by four, 1.5 volt AA size batteries.
When the output of the batteries under load drops, the display will
alternate between “LOW POWER DETECT” and “REPLACE
BATTERY”. Low power may affect performance. The unit should
not be used to measure pressure in this condition. All four batteries
should be replaced.
To replace the battery locate the battery compartment at the bottom
rear of the manometer, as shown here.
Mar, 2008
Remove the two screws on either side of the battery cover by
turning them counterclockwise until the fully disengaged from the
manometer base. Lift the cover from the back of the unit.
Remove the batteries by pulling the positive side first straight out
of the battery compartment. Note the positive (+) and negative (-)
battery polarity markings at the bottom of the compartment, as
shown here.
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page 34 of 36
Page 35
M2 Series
Instruction Manual 9R68-A
To install the four batteries: 1) Make sure polarity of battery
matches the markings in the compartment. 2) 1st place the (+) end
of the battery into the bottom of the battery slot. 3) Then push in
(-) end of the battery until it is seated in the bottom of the battery
slot. The battery compartment has stand offs molded into the side
of the compartment. When a battery is installed with the polarity
reversed, the stand offs prevent the negative battery terminal from
contacting the positive terminal in the battery compartment. The
unit will not power up when a battery is installed this way. Should
this happen, simply reverse the battery to align the polarity.
With the batteries secured in the battery compartment, replace the
compartment cover. The cover has only one correct alignment.
The “WARNING
statement on the battery cover must be visible and aligned in the
middle of the manometer case. To secure the cover, torque the
screws clockwise to 1.6-1.8 in-lbs. Do not over tighten.
DO NOT OPEN IN EXPLOSIVE ATMOSPHERE
Mar, 2008
”
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page 35 of 36
Page 36
M2 Series
Instruction Manual 9R68-A
Contact Information
If the Manometer can not be zeroed, recalibrated or is damaged, it
must be returned to the factory for servicing. In this case, contact
the Meriam Process Technologies representative in your area or
call the factory at the numbers listed below for a Return Material
Authorization (RMA) number.
All M202 Precision Absolute Manometers recalibrated at the
factory are returned with certificates of NIST traceability.
Meriam Process Technologies
10920 Madison Ave.
Ph. (216) 281-1100 FAX (216) 281-0228
Cleveland, OH 44102
sales@meriam.com
E-mail
www.meriam.com
Web
Mar, 2008
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page 36 of 36
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