Meriam M1 User Manual
M1 Series - DM
E.O. 6409 JAN 2008
M1 SERIES – DIGITAL MANOMETER
USER MANUAL
Instruction Manual 9R000034-IR
Meriam Process Technologies’ M1 Series pressure instrument
is a microcontroller-based pressure sensing device that can be
used to directly measure pressure. Differential, Gauge and
Absolute pressure sensors are supported up to 100 PSI.
Pressure can be displayed in selectable engineering units of
PSI, bar, mbar, kPa, mmHg, inHg, mmH2O or inH2O.
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M1 Series - DM
E.O. 6409 JAN 2008
Table of Contents
Introduction ............................................................... 3
User Interface..........................................................4
Single Keypad Functions ...........................................4
ON/OFF (O) Key ....................................................4
BACKLIGHT (B) Key ...........................................4
FUNC (F) Key ........................................................4
UNIT (U) Key.........................................................4
Zeroing the M1 .......................................................... 5
Functional Modes ......................................................5
Liquid Crystal Display (LCD) ................................6
Engineering Units Select ........................................7
Record Mode .......................................................... 8
Auto Shut-Off .........................................................9
Field Recalibration .................................................. 10
ZERO....................................................................10
SPAN ....................................................................11
Restore Factory Defaults ......................................11
Specifications ..........................................................12
Certification/Safety/Warnings .................................14
Changing the Batteries.............................................14
User Connections..................................................... 16
Contact Information................................................. 17
Instruction Manual 9R000034-IR
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Page 2 of 17
M1 Series - DM
E.O. 6409 JAN 2008
Introduction
Thank you for purchasing this Meriam product. Meriam has been
providing innovative, reliable, cost-effective measurement and
calibration solutions since 1911.
The M1 has been designed using the latest technology to provide
reliable accuracy throughout its entire operating temperature range,
dependable operation, and exceptional battery life.
The compact design makes the unit easy to carry and the intuitive
user interface makes it easy to use.
Pressure measurements are displayed on a large, easy-to-read
liquid crystal display (LCD). This unit has two backlights: a green
backlight which is user activated, and an automatic red backlight
which indicates an error/over-range condition.
Four keys provide direct access to frequently used functions (like
Units, Backlight). Other, less frequently used functions (like Zero,
Span, and Record) are accessible via multiple key combinations. A
complete list of these functions is printed on the back of the case.
Instruction Manual 9R000034-IR
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Page 3 of 17
M1 Series - DM
E.O. 6409 JAN 2008
User Interface
Instruction Manual 9R000034-IR
Single Keypad Functions
ON/OFF (O) Key
The ON/OFF key, represented by the standard ON/OFF symbol,
turns the M1 ON or OFF (note: the ON/OFF key must be held until
the display turns on or off). Upon power on, the M1 will perform a
self test, display all segments for approximately 1-2 seconds, then
go into the normal pressure measure mode using the last pressure
units selected.
To view the calibrated accuracy and firmware revision, press and
hold the ON/OFF key for approximately 2 seconds upon power on.
The display will alternate between the calibrated accuracy and
firmware revision for as long as the ON/OFF key is held.
BACKLIGHT (B) Key
The BACKLIGHT key, represented by the standard light-bulb
symbol, turns the green display backlight on and off. The backlight
will remain on for approximately 20 seconds if not manually
turned off. To temporarily override the auto shut off feature, press
and hold the BACKLIGHT key for approximately 2 seconds (until
the backlight turns on-off-on).
FUNC (F) Key
This key selects the functional mode of the M1. Detailed
instructions are provided on the back of the unit and in the
subsequent sections.
UNIT (U) Key
This key selects the engineering unit of measure desired when the
M1 is in NORMAL or TEMP mode.
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M1 Series - DM
E.O. 6409 JAN 2008
1. Zeroing the M1
To Zero the M1, first turn off pressure sources and vent pressure
ports to atmosphere. Then simultaneously press and hold the F
and U keys until “F.CAL” is displayed. The display will read “---” during the zeroing process. The process is complete when the
display changes from “----” to a “zero” reading.
Note: The M1 can only be zeroed if the measured zero is within
±2.5% (of FS) of the factory calibrated zero limit. Further
details are provided under Field Recalibration.
2. Functional Modes
The Digital Manometer supports NORMAL and TEMP modes.
The NORMAL mode of operation has an additional sub-mode
referred to as “REC” or record mode, which is described later.
For Pressure measurements:
The red backlight will illuminate when the M1 is measuring
pressure values outside its calibrated range. When the red backlight
is on, the accuracy of these measurements is uncharacterized.
Beyond 110% of the calibrated range, “----” will be displayed. The
red backlight will be illuminated in both cases.
The minimum and maximum pressure the M1 has measured is
permanently recorded for factory warranty issues.
For Temperature measurements:
• Selecting the TEMP mode (the °F or °C icon) will display the
internal ambient temperature of the M1.
o the UNIT key will toggle between °F and °C
The minimum and maximum temperature the M1 has
measured is permanently recorded for factory warranty issues.
Instruction Manual 9R000034-IR
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M1 Series - DM
E.O. 6409 JAN 2008
Liquid Crystal Display (LCD)
Instruction Manual 9R000034-IR
The LCD displays the:
• Pressure or Temperature measurement via large digits,
• Pressure measurement via bar graph, and
• Pressure or Temperature engineering units via icons.
A low battery warning (the BAT icon) is displayed when the
batteries require replacement. Approximately 2 hours of run time
is available immediately following a low battery warning.
The bar graph at the bottom of the display always shows a reading
of the currently applied pressure as a percent of the full scale of the
M1.
The LCD incorporates two backlights:
• a green backlight which is user activated via the BACKLIGHT
key, and
• a red backlight which is automatically activated during an
error/over-range condition
During an error or over-range condition, the red backlight will
“over-ride” the green backlight. However, once the error or overrange condition is corrected, the green backlight will be restored to
its previous state (if the backlight auto-off timer did not expire).
The backlight should be turned off when not needed to conserve
battery power. The backlight feature will be reduced when the M1
is in low battery mode.
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