Meriam M203 User Manual
User’s Manual 9R122-A
M203 Altimeter / Indicated Air Speed Tester
USER’S MANUAL
June, 2010
The Meriam Process Technologies (Meriam) M203 Altimeter / Indicated Air Speed Tester is a
microprocessor based pressure sensing device used to measure pressure 0-900 millimeters
(mm) Hg relative to absolute zero. The handheld is NIST traceable.
When used in Pressure Measure Mode, pressure can be displayed in a variety of engineering
units. Select the
altimeter instruments. Pressing the TARE button from Altitude Mode changes the M203 to Air
Speed Mode for checking air speed instruments.
A timed leak test function is available for Pressure, Altitude and Air Speed Measure Modes. Other
s
feature
include a Min/Max capture, selectable damp rates and field re-calibration.
ALT / IAS engineering unit and the M203 converts to Altitude Mode for checking
Safety Information
Failure to follow all instructions could result in injury.
Read, understand and follow all safety warnings and
instructions
provided with this product. Also, meet or
exceed your employer’s safety practices.
In no event shall Meriam be liable for any indirect, special,
incidental, consequential or punitive damages or for any lost
profits arising
out of or relating to any services provided by
Meriam or its affiliates. It is not possible for Meriam to identify all
foreseeable uses/misuses, therefore all persons involved in
commissioning, using or maintaining this product must satisfy
themselves that each intended application is acceptable.
Safety Warnings
The table below defines the safety symbols, si
gnal words and
corresponding safety messages used in the manual to identify
potential hazards and are intended to warn persons about
hazards that could result in personal injury or equipment damage.
This is the Read Instruction Manual symbol. This symbol indicates
h that you must read the instruction manual.
This is the Safety Alert symbol. This symbol indicates a WARNING.
Warnings alert you to actions that can cause personal injury or pose
a physical threat. Please read these carefully.
This is the Safety Glasses symbol. This symbol indicates that you
must wear approved safety glasses during the task.
This is the Safety Gloves symbol. This symbol indicates that you
must wear approved safety gloves during the task.
Indicates a potentially hazardous situation which, if
not avoided, will result in death or serious injury.
Indicates a potentially hazardous situation which, if
not avoided, could result in death or serious injury.
Indicates a potentially hazardous situation which, if
not avoided, could result in minor or moderate injury.
Indicates information essential for proper product
installation, operation or maintenance.
Inform
ation in this document is subject to change without
notice. Check the Meriam web site (www.meriam.com) for
the latest manual revision.
Table of Contents
Certification/Safety/Warnings .......................................................1
Us
er Interface ...............................................................................2
1.
Keypad Functions ...................................................................2
ON/OFF & BACK KEY ................................................................2
MIN/MAX & UP KEY...................................................................2
TARE & DOWN KEY ..................................................................2
PRGM & ENTER KEY.................................................................3
BACKLIGHT KEY..........................................................................3
2.
Zeroing the Manometer ...........................................................4
3.
Program Mode ......................................................................8
Units Select ..................................................................................9
ALT / IAS (Altitude / Indic
Damp Rate Select ........................................................................12
User Info Select (Accuracy, SW version, Mfr date, SN).........................13
Auto Shut-Off...............................................................................14
Lockout Select..............................................................................15
Header Name ..............................................................................16
Contrast Select............................................................................17
Data Logging ...............................................................................18
Leak Test....................................................................................19
ated Air Speed) Mode..................................10
Re-Calibration..............................................................................20
RE-CALIBRATION – 1 Point EDIT and START...................................21
RE-CALIBRATION – 5 Point EDIT....................................................22
RE-CALIBRATION – 5 Point START ................................................23
RE-CALIBRATION – Restore Fac
S
pecifications...............................................................................25
Changing the B
atteries ................................................................26
tory Defaults ...................................24
Service and Calibration................................................................28
Certification/Safety/Warnings
User’s Manual 9R122-A
Fire/Explosion Hazard. This instrument is
not intrinsically safe. DO NOT use in
areas that
may contain flammable gas or vapors,
combustible dusts or ignitable fibers where an unintended
spark can cause a fire/explosion.
Do not exceed the Pressure Limits listed
in the Specifications section of this
manual. Failure to operate within the specified pressure
limit
could result in minor or moderate injury
Substitution of components may impair
operation and safety.
Disconnect power before servicing.
June, 2010
The product should not be powered
a combination of new and old
with
batteries.
The product should not be powered with a
c
ombination of batteries from different
manufacturers.
User m
ust 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.
1
User Interface
Keypad Functions
1.
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 P
function nulls the applied pressure and sets the display value to
“0”. With Tare activated, the letter “T” appears in the lower left of the display.
ressure Measure Mode, toggles on/off the Tare function. The Tare
he ALT / IAS Measure Mode (selected from Program Mode under
In t
Units Select menu), the Tare button toggles between ALTITUDE function
and AIR SPEED function.
The ▼ key is used to s
Program Mode. Once a programmable register is selected the ▼ key can be
used to edit that register.
croll through programmable registers when the unit is in
2
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 non-volatile memory. This key also acts as a forward space ► key
when editing user inputs such as the header name.
BACKLIGHT KEY
The BA
the display backlight between on and off.
CKLIGHT key, represented by the standard light bulb symbol, toggles
The backlight c
it is not needed, to optimize battery life.
onsumes additional battery energy. Turn the backlight off, when
3
Zeroing the Manometer
2.
The M203 Precision Sm
instrument. However, on occasion the M203 should have a new zero taken.
This is done to remove zero drift that can occur since the manometer was
last zeroed. The M203 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 M203 provides three mechanisms for re-zeroing:
Referenced to Absolute Zero: This traditional and preferred method
1.
takes a “snapshot” of the measured pressure when a vacuum of les
microns Absolute is applied to the sensor.
Factory Zero: This method restores the calibration curve to the original
2.
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 since shipment will not be accounted for.
art Manometer is a stable and precise
s than 100
User-Adjusted Zero: This method allows the user to enter any pressure
3.
value when a known reference is applied (for example, the local barometric
pressure reading). The manometer will compare its actual measured value
with the entered value, and calculate a new zero reference based on the offset.
4
To zero the manometer using Referenced to Absolute Zero,
1.
start with the unit turned OFF and use the following keystroke
sequence:
Keystroke Display
1.
Press ON/OFF button.
2.
Connect the M203 to a
vacuum source capable of 100
microns absolute or less.
3.
Pull a full vacuum
4. Press MIN/MAX and TARE
keys at the same time. (See
Figure 1 below.)
5. Press the PGRM key.
The display briefly shows
the header name and full
scale range in the last
engineering units selected.
The manometer then goes
into the Measure Mode
showing the pressure and
engineering unit.
Display should read close
to zero. (See note on next
page)
Top line ofdisplay reads
“ZEROING SOURCE:”
Bottom line of display
reads “REF TO ABS ZERO”
Top line ofdisplay reads
“ZERO IN PROGRESS”
while bottom line counts
down from 9. Zeroing is
complete when unit returns
to Measure Mode.
Figure 1
NOTE: The M203 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.
5
To zero the manometer using Factory Zero, start with the unit
2.
turned ON and in Measure Mode. Then use the following
keystroke sequence:
Keystroke Display
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. Zeroing is complete when unit
The Factory Zero feature is intended for comparison purposes only. Factory
Zero should not be used as a reference for actual pressure measurement
because zero-drift occurring after shipment would not be accounted for. Use
Referenced to Absolute Zero or User-Adjusted Zero options when re-zeroing is
necessary.
3.
To zero the manometer using User-Adjusted Zero, start with the unit
turned ON and in Measure Mode. Then 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”
returns to Measure Mode.
Keystroke Displ
1. Apply a known, accurate
pressure source. This may be
true atmospheric pressure from a
reference barometer
ay
6
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”
3. Press ▲ or ▼ arrow key until
desired zero function is shown on
the bottom line.
4. Press the PRGM key.
5. Press any of ▲ or ▼ arrow key
or the PRGM key to begin editing.
Example: set current pressure value
to 29.5 in Hg @ 0° C Abs.
6. Press the ▲ or ▼ arrow key to
set the first digit to 0.
Bottom line of display reads “USER
ADJ. ZERO”
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.
Top line of display continuously
updates. Bottom line of display data
is ready for editing; the first
character location is blinking.
Current: xxx.xx
0xx.xx INHG
Using the ▲ 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 User Adj. Value is
correct press the PRGM key.
Cursor flashes to the right of “0”.
7
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