Meriam M2 Series User manual
M2 Series Instruction Manual 9R68-A
Mar, 2008
page 1 of 6
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 II 1 G
Ex ia IIC T4
(Tamb. -5ºC to +50ºC)
DE KO 06 ATEX 0615699
IP40
M202
Precision Absolute Manometer
M202
Precision Absolute Manometer
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
M2 Series Instruction Manual 9R68-A
Mar, 2008
page 2 of 6
Table of Contents
User Interface ................................................................................
1. Keypad Functions ...............................................................
ON/OFF & BACK KEY......................................................
MIN/MAX & UP KEY .......................................................
TARE & DOWN KEY........................................................
PRGM & ENTER KEY....................................................... 4
BACKLIGHT KEY ................................................................. 4
2. Zeroing the Manometer....................................................... 5
. 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.......................................................................... 2
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 ................... 0
Specifications .............................................................................. 1
Certification/Safety/Warnings .....................................................
Changing the Batteries................................................................. 4
Contact Information..................................................................... 6
M2 Series Instruction Manual 9R68-A
Mar, 2008
page of 6
User Interface
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 rogram
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 & U
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 rogram 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 rogram Mode. Once a programmable register is
selected the key can be used to edit that register.
Tare
M2 Series Instruction Manual 9R68-A
Mar, 2008
page 4 of 6
RGM & ENTER
KEY
Puts the manometer into the rogram Mode from the Measure
Mode. When in the rogram 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 non-
volatile 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.
M2 Series Instruction Manual 9R68-A
Mar, 2008
page 5 of 6
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.
. 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:
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
FAX 781.665.0780 - TestEquipmentDepot.com
M2 Series Instruction Manual 9R68-A
Mar, 2008
page 6 of 6
Keystroke Display
1. Press ON/OF button. The display briefly shows
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.
2. Connect the 55 to a
vacuum source capable
of a vacuum of 100
microns absolute
pressure or less.
. Pull a full vacuum. Display should read close to
zero. (See note on next
page)
4. Press MIN/MAX and
TARE keys at the same
time. (See figure 1
below.)
Top line of display reads
“ZEROING SOURCE:”
Bottom line of display reads
“REF TO ABS ZERO”
5. Press the PRGM key. Top line of display reads
“ZERO IN PROGRESS”
while bottom line counts
down from 9. Zeroing is
complete when unit returns
to Measure Mode.
Figure 1
Tare
M2 Series Instruction Manual 9R68-A
Mar, 2008
page 7 of 6
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
1. Press MIN/MAX and
TARE keys at the
same time. (See
figure 1 above.)
Top line of display reads
“ZEROING SOURCE:”
Bottom line of display
reads “REF TO ABS
ZERO”
2. Press or arrow
key until desired zero
function is shown on
the bottom line.
Bottom line of display
reads “FACTORY ZERO”
. Press the PRGM key. Zeroing is complete when
unit returns to Measure
Mode.
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.
. To zero the manometer using User-Adjusted Zero, start
with the unit turn ON and in Measure Mode and use the
following keystroke sequence:
M2 Series Instruction Manual 9R68-A
Mar, 2008
page 8 of 6
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.)
Top line of display reads
“ZEROING SOURCE:”
Bottom line of display
reads “REF TO ABS
ZERO”
. Press or arrow
key until desired zero
function is shown on
the bottom line.
Bottom line of display
reads “USER ADJ.
ZERO”
4. Press the PRGM key. Top line of display shows
the current non-zero
compensated pressure
value. Bottom line of
display shows the same
value, along with the
engineering unit.
5. Press any of or
arrow key or the
PRGM key to begin
editing.
Top line of display
continuously updates.
Bottom line of display data
is frozen, and the first digit
is blinking.
Example: set current
pressure value to 29.5
In Hg @ 0º C.
M2 Series Instruction Manual 9R68-A
Mar, 2008
page 9 of 6
6. Press the or
arrow key to set the
first digit to 0.
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.
Cursor flashes to the right
of “0”.
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.
Current: xxx.xx
029.50 INHG
9. Press the PRGM key
to enter the final
digit.
Zeroing is complete when
unit returns to Measure
Mode.
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.
M2 Series Instruction Manual 9R68-A
Mar, 2008
page 10 of 6
3. rogram Mode
The program mode is used to configure the manometer for
Measure Mode operation. After the RGM 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 rogram Mode
are Units Select, Damp Rate Select, User Info Select, Contrast
Select, Sea Level Select, Data Logging, Leak Test and Exit.
Press the RGM key to select any of these configurable registers.
The manometer can be put into rogram Mode at any time during
Measure Mode operation by pressing the RGM 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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