M2 Series Instruction Manual 9R68-A Mar, 2008 M2 – SERIES USER MANUAL Precision Absolute Manometer M202 Precision Absolute Manometer M202 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.
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 ..............
M2 Series Instruction Manual 9R68-A Mar, 2008 User Interface Tare 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 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.
M2 Series Instruction Manual 9R68-A Mar, 2008 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 nonvolatile memory. This key also acts as a forward space key when editing user input such as the header name and user units.
M2 Series 2. Instruction Manual 9R68-A Mar, 2008 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.
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 Mode where the applied pressure and engineering unit of measure are displayed. 2. Connect the 355 to a vacuum source capable of a vacuum of 100 microns absolute pressure or less. 3. Pull a full vacuum. Display should read close to zero.
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 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” 3.
M2 Series Keystroke Instruction Manual 9R68-A Mar, 2008 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:” 3. 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.
M2 Series 6. Press the or arrow key to set the first digit to 0. Instruction Manual 9R68-A Mar, 2008 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.
M2 Series 3. Instruction Manual 9R68-A Mar, 2008 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”. The bottom line reads “UNITS SELECT”. Press the or arrow keys to scroll through the Program Mode to the desired register.
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) PSI kPa mbars Bars Torr Feet (Altitude displays) Meters (Altitude displays) To change the engineering units the manometer should be “ON” and in Measure Mode. Then follow these steps: Keystroke 1. Press the PRGM key. 2. Press the PRGM key. 3.
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 steps: Keystroke 1. Press the PRGM key. 2. Press the PRGM key. 3. Press the or arrow key until “USER UNIT SELECT” is displayed. 4. Press the PRGM key. 5. Press the PRGM key. 6. Press the key.
M2 Series 2. Press the PRGM key. 3. Press the or arrow key until “USER UNIT SELECT” is displayed. 4. Press the PRGM key. 5. Press the arrow key once. 6. Press the PRGM key. 7. If the value shown in step 6 is the correct altitude, press the PRGM key to accept and the key to return to Measure Mode. Instruction Manual 9R68-A Mar, 2008 Top line reads “UNITS SELECT” and bottom line shows current engineering unit. Top line reads “UNITS SELECT” Bottom line reads “FEET or METERS”.
M2 Series 10. When the digit is correct press the PRGM key. If an error is made use the back space key to move the cursor back to the incorrect digit. Press the or arrow keys to display the correct value. 11. Continue the process until the display reads as shown at right. 12. Press the PRGM key to enter the final value. 13. Press the key to return to Measure Mode. Instruction Manual 9R68-A Mar, 2008 Cursor flashes to the right of the “6”. Example: “60000000”. Top line reads “USER MODEFEET”.
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” which extends downward from the instruments location to sea level. This fictitious column is assumed to be similar to the actual air column over nearby lower elevations.
M2 Series Instruction Manual 9R68-A Mar, 2008 7. To change the value press the key to toggle the display to “YES”. Top line reads “VALUE=: 00000000”. Bottom line reads “CHANGE?: YES”. 8. Press the PRGM key. 9. Press the or arrow keys to set the correct value in the first digit. Top line reads “SEA LEVEL METERS”. Bottom line reads “00000000”. Top line reads “SEA LEVEL METERS”. Bottom line reads “70000000”. 10. When the value is correct press the PRGM key. Cursor moves over to the next digit.
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. The microprocessor collects data from the sensor every 0.1 seconds. The display updates every 0.5 seconds, showing the current 0.1 second pressure reading.
M2 Series Instruction Manual 9R68-A Mar, 2008 User Info Select The User Info Select registers are designed to provide the user with information on the hardware and software in the manometer. This register provides read only information on the sensor’s serial number, software version and date of manufacture. It also allows the user to edit the Auto Shut-Off, Lockout and Start-Up Header Name features. To access the User Info Select registers, follow the steps below.
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. Disabling this feature limits the manometer to being turned off by using the ON/OFF key only. To configure auto shut-off follow these steps: Keystroke 1.
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” (twodigit Lockout Code) within approximately 40 seconds when prompted. Failure to enter the correct two digit code within approximately 40 seconds will return the unit to Measure Mode. Any two-digit numeric code can be programmed.
M2 Series Instruction Manual 9R68-A Mar, 2008 Header Name Follow the steps below to edit the Header Name. Keystroke 1. From the Measure Mode press the PRGM key. 2. Press the up arrow key twice. 3. Press the PRGM key. 4. Press the up arrow key five times. 5. If header is correct press backspace key. If editing is desired proceed to step 7. 6. Press the left arrow key. 7. Press the up or down arrow keys to set the correct alpha-numeric value. 8. Press the right arrow key to accept entry. 9.
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: Keystroke 1. From the Measure Mode press the PRGM key. 2. Press the key three times. 3. Press the PRGM key. 4. Press the or keys to increase or decrease the contrast value.
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. In manual mode, a pressure value is captured each time the PRGM key is pressed up to 240 values. The data collected during a logging session can be viewed upon completion. Keystroke 1. From the Measure Mode press the PRGM key.
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. The maximum configurable leak test period is 1440 min (1 day). Pressing any key during the leak test will abort the test. To enable Leak Test follow these steps: Keystroke 1.
M2 Series Instruction Manual 9R68-A Mar, 2008 Re-Calibration The Manometer can be re-calibrated in the field for zero, span, and linearity. The proper primary standards must be available prior to calibrating the Manometer. These standards should meet the accuracy requirements for your company or industry. Meriam Process Technologies follows the guidelines established by ANSI / NCSL Z540-1-1994 which requires that the primary standard be 4 times more accurate than the unit under test.
M2 Series Instruction Manual 9R68-A Mar, 2008 Once a re-calibration has been performed (either 1-point or 5point) the unit will continue to allow future re-calibrations only with that type of re-calibration. In order to enable the other recalibration type, the user must first restore the re-calibration data to the factory defaults. www.meriam.
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 1. With unit OFF, press and hold the MIN/MAX key, turn the unit on by pressing the ON/OFF key, then release MIN/MAX. 2. Press the up arrow key until “START” is displayed on the bottom line. 3. Press the PRGM key. 4. Press the PRGM key. 5.
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. Keystroke 1. With unit OFF, press and hold the MIN/MAX key, turn the unit on using the ON/OFF key, then release 2. Press the PRGM key. 3. Press the up/down arrow keys to edit the selected digit.
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 1. Press and hold the MIN/MAX key and turn the unit on by pressing the ON/OFF key. 2. Press the up arrow key until “START” is displayed on the bottom line. 3. Press the PRGM key. 4. Press the up arrow key until “5-POINT” is displayed on the bottom line. 5. Press the PRGM key. 6.
M2 Series 10. Use up or down arrow keys to select NO or YES when asked “Save?” the Re-Calibration data. 11. Press the PRGM key at YES to save the ReCalibration data or at NO to exit without saving. 12. Press the left arrow key. Instruction Manual 9R68-A Mar, 2008 Top line reads “SAVE?”. Bottom line reads “NO” or “YES”. Top line reads “RE-CAL”. Bottom line reads “START”. Re-cal is complete. Returns to Measure Mode.
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 *F.S. = 2000 mm Hg Absolute Includes the combined effects of temperature, linearity, repeatability, hysteresis and resolution. Warm up time = 5 minutes.
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. A copy of this drawing accompanies each unit shipped. Remove and / or replace batteries in non-hazardous areas only.
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.
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” and “REPLACE BATTERY”. Low power may affect performance. The unit should not be used to measure pressure in this condition.
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. The battery compartment has stand offs molded into the side of the compartment.
M2 Series Instruction Manual 9R68-A Mar, 2008 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. Meriam Process Technologies 10920 Madison Ave. Cleveland, OH 44102 Ph. (216) 281-1100 FAX (216) 281-0228 E-mail sales@meriam.com Web www.meriam.
