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User's Manual 9R122-A
June, 2010
M203 Altimeter / Indicated Air Speed Tester
USER'S MANUAL
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 ALT / IAS engineering unit and the M203 converts to Altitude Mode for checking
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
features include a Min/Max capture, selectable damp rates and field re-calibration.
info@Meriam-Direct.com
1.888.475.5235
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Summary of Contents for Meriam M203
- Page 1 When used in Pressure Measure Mode, pressure can be displayed in a variety of engineering units. Select the ALT / IAS engineering unit and the M203 converts to Altitude Mode for checking altimeter instruments. Pressing the TARE button from Altitude Mode changes the M203 to Air Speed Mode for checking air speed instruments.
- Page 2 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.
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Page 3: Table Of Contents
..................19 Leak Test Re-Calibration................20 ........21 RE-CALIBRATION – 1 Point EDIT and START ............22 RE-CALIBRATION – 5 Point EDIT ..........23 RE-CALIBRATION – 5 Point START ........24 RE-CALIBRATION – Restore Factory Defaults Specifications................25 Changing the Batteries ..............26 Service and Calibration..............28 info@Meriam-Direct.com 1.888.475.5235... -
Page 4: Certification/Safety/Warnings
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. info@Meriam-Direct.com 1.888.475.5235... -
Page 5: User Interface
Units Select menu), the Tare button toggles between ALTITUDE function and AIR SPEED function. The ▼ key is used to scroll through programmable registers when the unit is in Program Mode. Once a programmable register is selected the ▼ key can be used to edit that register. info@Meriam-Direct.com 1.888.475.5235... -
Page 6: Prgm & Enter Key
BACKLIGHT KEY The BACKLIGHT key, represented by the standard light bulb symbol, toggles the display backlight between on and off. The backlight consumes additional battery energy. Turn the backlight off, when it is not needed, to optimize battery life. info@Meriam-Direct.com 1.888.475.5235... -
Page 7: Zeroing The Manometer
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. - Page 8 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”...
- Page 9 To zero the manometer using User-Adjusted Zero, start with the unit turned ON and in Measure Mode. Then use the following keystroke sequence: Keystroke Display 1. Apply a known, accurate pressure source. This may be true atmospheric pressure from a reference barometer info@Meriam-Direct.com 1.888.475.5235...
- Page 10 0 – 9, (-) negative, (.) decimal point. The (-) sign is used if your location is below sea level. 7. When the User Adj. Value is Cursor flashes to the right of “0”. correct press the PRGM key. info@Meriam-Direct.com 1.888.475.5235...
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Page 11: Program Mode
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). info@Meriam-Direct.com 1.888.475.5235... -
Page 12: Units Select
Units Select The standard units available on the M203 are: Inches of Mercury at 0° C (in Hg @ 0° C) (absolute) Millimeters of Mercury at 0° C (mm Hg @ 0° C) (absolute) PSI (absolute) Mbars (absolute) Bars (absolute) -
Page 13: Alt/ Ias (Altitude / Indicated Air Speed) Mode
ALT/ IAS (Altitude / Indicated Air Speed) Mode The model M203 is capable of displaying altitude (feet or meters based on “U.S. Standard Atmosphere 1962” tables) and air speed (knots, MPH or km/h). The ALT / IAS Mode is selected from Program Mode in the Units Select menu. Once ALT / IAS Mode is selected, the M203’s default measurement is altitude. - Page 14 Mode will be restored upon cycling power and altitude will be displayed. 3. When the M203 is displaying air speed and power is turned off (manually or automatically), Program Mode is entered, or the Tare key is pressed, the unit will be returned to altitude display once power is cycled or the unit is returned to Measure Mode.
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Page 15: Damp Rate Select
Adjustable exponential type damping is available to steady the display when measuring pulsating pressures. The M203 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. -
Page 16: User Info Select (Accuracy, Sw Version, Mfr Date, Sn)
9. Press the ◄ arrow key. Top line reads “HEADER See instructions for editing NAME” and bottom line the Header later in this reads “MERIAM”. The manual. cursor flashes at bottom left. 10. Press the ◄ arrow key Top line reads “PROGRAM to go back to “USER INFO... -
Page 17: Auto Shut-Off
Returns to Measure key three times. Mode. 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 Data-Logging or Leak Test sessions. info@Meriam-Direct.com 1.888.475.5235... -
Page 18: Lockout Select
5. Press the right arrow key Top line reads “LOCKOUT when the desired code is set. CODE” and bottom line reads Lockout is activated. “ENTER TO SELECT”. 6. Press the left arrow key Returns to Measure Mode. twice info@Meriam-Direct.com 1.888.475.5235... -
Page 19: Header Name
4. Press the up arrow key five Top line reads “HEADER times. NAME” and bottom line reads “MERIAM”. The cursor flashes at bottom left. 5. If header is correct press Top line reads “PROGRAM backspace key. If editing is MODE”... -
Page 20: Contrast Select
Top line reads “PROGRAM MODE” and bottom line reads “UNITS SELECT”. 6. Press ◄ 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 info@Meriam-Direct.com 1.888.475.5235... -
Page 21: Data Logging
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. info@Meriam-Direct.com 1.888.475.5235... -
Page 22: Leak Test
Bottom line shows the current pressure reading. 9. Press the PRGM key. Return to Measure Mode 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. info@Meriam-Direct.com 1.888.475.5235... -
Page 23: Re-Calibration
For sensors up to 200 PSI, Meriam recommends a ±0.0015% of reading deadweight tester. If calibrating using inches or millimeters of mercury, be sure to match the reference temperature of mercury in both the M203 and the deadweight tester. The reference temperature for these units in the M203 is 0º... -
Page 24: Re-Calibration - 1 Point Edit And Start
“CAL POINT” value. 7. Apply the input pressure Top line reads “RE-CAL”. indicated using an Bottom line reads appropriate reference “START”, Manometer has standard; press PRGM been recalibrated. key. 8. Press the left arrow key. Returns to Measure Mode info@Meriam-Direct.com 1.888.475.5235... -
Page 25: Re-Calibration - 5 Point Edit
START is Continue with 5-Point Re- displayed on the bottom line. calibration procedure at step 3 on next page. OR To exit without performing the 5- Returns to Measure Mode. point re- cal press the left arrow info@Meriam-Direct.com 1.888.475.5235... -
Page 26: Re-Calibration - 5 Point Start
POINTS 4 and 5. APPLY” Bottom line displays the cal point value. 10. Use up or down arrow Top line reads “SAVE?”. keys to select NO or YES Bottom line reads “NO” or when asked “Save?” the Re- “YES”. Calibration data info@Meriam-Direct.com 1.888.475.5235... -
Page 27: Re-Calibration - Restore Factory Defaults
Bottom reads “YES” or defaults. “NO”. 5. Press the PRGM key. Top line reads “RE-CAL”. Bottom line reads “RESTORE DEFAULTS”. Factory defaults have been restored. 6. Press the left arrow key. Returns to Measure Mode. info@Meriam-Direct.com 1.888.475.5235... -
Page 28: Specifications
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. info@Meriam-Direct.com 1.888.475.5235... -
Page 29: Changing The Batteries
Lift the battery cover from the back of the product case. Remove the batteries by pulling the positive side first straight out of the battery compartment. Note the positive (+) and negative (-) info@Meriam-Direct.com 1.888.475.5235... - Page 30 Secure the cover by applying a clockwise torque of 1.6 to 1.8 in- lbs. Do not over tighten. To prevent internal damage to circuitry, do not substitute screw lengths factory supplied screws. info@Meriam-Direct.com 1.888.475.5235...
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Page 31: Service And Calibration
Service and Calibration If the M203 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. - Page 32 For customer assistance please call your local Meriam representative or Meriam directly. Meriam Process Technologies 10920 Madison Avenue Cleveland, Ohio 44102 Telephone: (216) 281-1100 Fax: (216) 281-0228 E-mail: meriam@meriam.com Web: www.meriam.com info@Meriam-Direct.com 1.888.475.5235...
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