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Meriam M2 Series User Manual

Precision absolute manometer
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M2 Series
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
IP40
page 1 of 36
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
M2 – SERIES USER MANUAL
II 1 G
Instruction Manual 9R68-A
Mar, 2008

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  • Page 1 Mar, 2008 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.

  • Page 2: Table Of Contents

    M2 Series Instruction Manual 9R68-A Mar, 2008 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 ..............

  • Page 3: User Interface

    M2 Series Instruction Manual 9R68-A Mar, 2008 User Interface Tare 1. Keypad Functions ON/OFF & BACK 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.

  • Page 4: Prgm & Enter Key

    M2 Series Instruction Manual 9R68-A Mar, 2008 PRGM & ENTER 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).

  • Page 5: Zeroing The Manometer

    M2 Series Instruction Manual 9R68-A Mar, 2008 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.
  • Page 6 M2 Series Instruction Manual 9R68-A Mar, 2008 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...
  • Page 7 M2 Series Instruction Manual 9R68-A Mar, 2008 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 Press MIN/MAX and Top line of display reads TARE keys at the “ZEROING SOURCE:”...
  • Page 8 M2 Series Instruction Manual 9R68-A Mar, 2008 Keystroke Display Apply a known, accurate pressure source. This may be true atmospheric pressure, with known reference defined by a local barometer. Press MIN/MAX and Top line of display reads TARE keys at the “ZEROING SOURCE:”...
  • Page 9 M2 Series Instruction Manual 9R68-A Mar, 2008 Press the Current: xxx.xx arrow key to set the 0xx.xx INHG first digit to 0. 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.

  • Page 10: Program Mode

    M2 Series Instruction Manual 9R68-A Mar, 2008 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”.

  • Page 11: Units Select

    M2 Series Instruction Manual 9R68-A Mar, 2008 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)

  • Page 12: Displaying Altitude (Us Standard Atmosphere 1962)

    M2 Series Instruction Manual 9R68-A Mar, 2008 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...
  • Page 13 M2 Series Instruction Manual 9R68-A Mar, 2008 2. Press the PRGM key. Top line reads “UNITS SELECT” and bottom line shows current engineering unit. 3. Press the arrow Top line reads “UNITS key until “USER UNIT SELECT” SELECT” is displayed.
  • Page 14 M2 Series Instruction Manual 9R68-A Mar, 2008 10. When the digit is Cursor flashes to the right of the correct press the PRGM “6”. Example: “60000000”. key. If an error is made use the back space key to move the cursor back to the incorrect digit.

  • Page 15: Pressure Corrected To Sea Level

    M2 Series Instruction Manual 9R68-A Mar, 2008 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”...
  • Page 16 M2 Series Instruction Manual 9R68-A Mar, 2008 7. To change the value press Top line reads “VALUE=: key to toggle the 00000000”. Bottom line reads display to “YES”. “CHANGE?: YES”. 8. Press the PRGM key. Top line reads “SEA LEVEL METERS”.

  • Page 17: Damp Rate Select

    M2 Series Instruction Manual 9R68-A Mar, 2008 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.

  • Page 18: User Info Select

    8. Press the arrow key. Top line reads “HEADER See instructions for editing NAME” and bottom line reads the Header later in this “MERIAM”. The cursor flashes manual. at bottom left. 9. Press the arrow key to Top line reads “PROGRAM go back to “USER INFO...

  • Page 19: Auto Shut-Off

    M2 Series Instruction Manual 9R68-A Mar, 2008 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.

  • Page 20: Lockout Select

    M2 Series Instruction Manual 9R68-A Mar, 2008 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” (two- digit Lockout Code) within approximately 40 seconds when prompted.

  • Page 21: Header Name

    4. Press the up arrow key Top line reads “HEADER five 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 22: Contrast Select

    M2 Series Instruction Manual 9R68-A Mar, 2008 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:...

  • Page 23: Data Logging

    M2 Series Instruction Manual 9R68-A Mar, 2008 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.

  • Page 24: Leak Test

    M2 Series Instruction Manual 9R68-A Mar, 2008 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.

  • Page 25: Re-Calibration

    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.
  • Page 26 M2 Series Instruction Manual 9R68-A Mar, 2008 Once a re-calibration has been performed (either 1-point or 5- point) the unit will continue to allow future re-calibrations only with that type of re-calibration. In order to enable the other re- calibration type, the user must first restore the re-calibration data to the factory defaults.

  • Page 27: Re-Calibration - 1 Point Edit And Start

    M2 Series Instruction Manual 9R68-A Mar, 2008 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 Top line reads “RE-CAL”.

  • Page 28: Re-Calibration - 5 Point Edit

    M2 Series Instruction Manual 9R68-A Mar, 2008 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.

  • Page 29: Re-Calibration - 5 Point Start

    M2 Series Instruction Manual 9R68-A Mar, 2008 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 Top line reads “RE-CAL”. MIN/MAX key and turn the Bottom line reads “EDIT”.

  • Page 30: Re-Calibration - Restore Factory Defaults

    M2 Series Instruction Manual 9R68-A Mar, 2008 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 “YES”. Re-Calibration data. 11. Press the PRGM key at Top line reads “RE-CAL”.

  • Page 31: Specifications

    M2 Series Instruction Manual 9R68-A Mar, 2008 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...
  • Page 32 M2 Series Instruction Manual 9R68-A Mar, 2008 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.

  • Page 33: Certification/Safety/Warnings

    M2 Series Instruction Manual 9R68-A Mar, 2008 Certification/Safety/Warnings The following defines the certification and area classification of the Manometer product. 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.

  • Page 34: Changing The Batteries

    M2 Series Instruction Manual 9R68-A Mar, 2008 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”...
  • Page 35 M2 Series Instruction Manual 9R68-A Mar, 2008 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.

  • Page 36: 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.

This manual is also suitable for:

M202

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