MUNI Multi-Gas Detectors MP420 User’s Guide Rev 1.
MUNI User’s Guide Contents 1. General Information .......................................................................................................................................... 4 1.1 Main Features ..................................................................................................................................................... 4 2. Battery ...........................................................................................................................................
MUNI User’s Guide Read Before Operating This manual must be carefully read by all individuals who have or will have the responsibility of using, maintaining or servicing this product. The product will perform as designed only if it is used, maintained and serviced in accordance with the manufacturer’s instructions. The user should understand how to set the correct parameters and interpret the obtained results. CAUTION！ • REMOVE MONITOR COVER ONLY IN AREA KNOWN TO BE NON-HAZARDOUS.
MUNI User’s Guide WARNINGS ! This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. CAUTION: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.
MUNI User’s Guide 1. General Information The MUNI MP420 is a compact and lightweight 4-gas detector for worker safety at hazarous locations, with four standard sensors for oxygen (O2), combustibles (LEL), carbon monoxide (CO) and hydrogen sulfide (H2S). Alternative sensors are lead-free oxygen (O2), low power infrared methane (CH4), sulfur dioxide (SO2), and hydrogen cyanide (HCN). The detector is packaged in a robust housing with no moving parts.
MUNI User’s Guide 2. Battery Fully charge the MUNI battery upon receiving the instrument and before each day’s use. WARNING To reduce the risk of ignition of hazardous atmospheres, recharge only in an area known to be non-hazardous! 2.1 Battery Charging Slide the charge/comm connector into the bottom of the MUNI and the AC adapter to the wall power outlet. Alternatively, charge on a PC using the Micro-USB to USB cable. During active charging, the battery icon cycles from empty to full if the unit is on.
MUNI User’s Guide 3. User Interface The MUNI user interface consists of two keys, four sensor sockets, one large Liquid Crystal Display (LCD), six alarm LEDs, one buzzer, and one vibration alarm. 3.1 Displays and Keys The LCD provides visual information that includes real-time gas readings, sensor types, event log status, battery status, wireless status, and others.
MUNI User’s Guide 3.1.1 Status Indicator Icons Along the top of most screens are status icons that indicate whether a function is operating and/or its strength or level.
MUNI User’s Guide 3.2 Alarm Overview The MUNI provides an unmistakable four-way alarm notification that includes an audible buzzer, bright LED lights, vibration, and alarm notification on the display. The alarm thresholds can be programmed and the sensors selectively turned on or off. During each measurement period, the gas concentration is compared with the programmed alarm limits for Low, High, TWA and STEL alarms.
MUNI User’s Guide 4. Basic Operation 4.1 Turning On Press and hold the [ /↓] Key for 3 seconds, until the buzzer beeps and the red LED flashes. As the unit powers on, it will go through a self-test and warm-up before the MUNI’s main reading screen appears and it is ready for use. If a sensor is not warmed up, it will display “--" until it is ready (usually 30 seconds or less). CAUTION: The alarm is loud. During startup, one can mute most of the sound by temporarily holding a finger over the buzzer opening.
MUNI User’s Guide 4.5 Main User Menu Repeatedly pressing the Right [ /↓] key gives quick access to view various parameters. The Peak, Minimum, STEL and TWA for each sensor since turn-on are displayed, with the option to clear and re-start Peak or Minimum. The date and time screens are self-explanatory. If the MUNI is fitted with an LEL sensor, the corresponding Calibration Gas and Measurement Gas (and its Correction Factor) are displayed (these can be changed in mPower Suite).
MUNI User’s Guide 5. Configuration Mode The Configuration Mode (Config Mode) is used to adjust the MUNI’s operation settings and to calibrate sensors. 5.1 Entering Configuration Mode Press and hold both the [+/OK] and [ /↓] keys simultaneously for 3 seconds until the password screen appears (PWD_ _ _ _ ?). The default password is ‘0000’ and can be changed using mPower Suite software. The password is needed only the first time Configuration Mode is entered after power is turned on.
MUNI User’s Guide 5.4 Calibration and Bump Testing Use this menu to perform zero or span calibration for one or more sensors, bump test the sensors and alarms for function, and change the span gas concentration. The MUNI should be calibrated on the first day of use and at regular intervals not to exceed 180 days, depending on use and exposure to particulates, contaminants and sensor poisons. A daily bump test should be performed to ensure a functional response of all sensors and alarms.
MUNI User’s Guide 5.4.1 Recommended Span Gases 5.4.1.1 Span Gas Selection mPower recommends a mixture of 60 ppm CO / 15 ppm H2S / 2.5% CH4 (50% LEL) / 18% O2, (balance N2) to allow calibration of 4 standard sensors at the same time. Other calibration gas options are listed in the table below.
MUNI User’s Guide 5.4.2.1 Multi-Gas Span Calibration Select the proper Span Gas as described above and check the gas cylinder to ensure that the concentrations match the Span Gas Value(s). If not, adjust the value(s) as described below. Also, check the cylinder expiration date and do not use expired gas.
MUNI User’s Guide 5.4.2.2 Single-Gas Span Calibration Single-Gas Span Calibration can be done for gases not available in a mixture, or for the oxygen sensor at values lower than 20.9%. We recommend using 18% O2 for work in normal breathing air and 0% O2 (pure nitrogen) for work in inert atmospheres. If the Multi-Span gas mixture contains a sub-20.9% O2 level, it can also be used for an oxygen Single Span done separately.
MUNI User’s Guide 5.5 Sensor Enable/Disable Sensors can be disabled if they are not needed for a particular application, or if a sensor fails but the other sensors still provide useful readings. • To disable or enable a sensor, enter the Configuration Mode SENSOR ONOFF menu: Config mode →→ SENSOR ONOFF? • Press Left [+/OK] to enter and the On/Off status of the first sensor is flashing. • Press Right [ /↓] to scroll to the desired sensor and press Left [+/OK] to toggle On/Off.
MUNI User’s Guide 6. PC Communication The mPower Suite software can be used to 1) download logged events, 2) upload configuration parameters to the instrument and 3) upgrade the instrument firmware. mPower Suite and instrument firmware can be downloaded from our website at https://www.mpowerinc.com/software-downloads/ . Micro B (5-Pin) to USB cable 6.1 Connecting and Configuring • Turn on the instrument, cycle through the Main User Mode and enter COMM MODE.
MUNI User’s Guide 6.1.1 Configuration Details These items can be set up using mPower Suite and are not accessible in the instrument Configuration Mode or are easier to manage in mPower Suite. • Alarm Mode: Auto Reset means that the alarm signals stop as soon as the alarm condition no longer exists. Latched Mode means the alarm continues until the user acknowledges it by pressing the Left [+/OK] key. Under Alarm Device, the user can check or uncheck the boxes to enable or disable any alarm signal.
MUNI User’s Guide • Individual Sensor Alarm Levels, Span Gas Concentrations and Display Units can also be set in the sensor tabs in the far right panel. • LEL Calibration Gas and Measurement Gas can be selected from a list of over 50 compounds for the Pellistor LEL sensor. If Measurement and Cal Gas are different, a correction factor is calculated and applied to make the sensor display in %LEL equivalents of the measurement gas.
MUNI User’s Guide 6.2 Event Log Retrieval and Calibration Certificates The MUNI automatically stores up to 1000 events consistiing of bump test results, calibration results, and alarm events that last for more than a few seconds. When the storage is full, the oldest data get overwritten by the newest event. • Event logs can be retrieved either directly from the instrument or via the MuniDock. • To download the event log to the PC, select “Download Log” on the bottom panel bar.
MUNI User’s Guide Calibration Certificate Generated from MUNI directly or via MuniDock 7. MuniDock Operation 7.1 MuniDock Cal/Bump Procedures • For best results, download the latest version of mPower Suite at https://www.mpowerinc.com/software-downloads/. • Further instructions will be included when the MuniDock becomes available. 7.2 MuniDock Data Download and Calibration Certificates • Instructions will be included when the MuniDock becomes available.
MUNI User’s Guide 8. Maintenance The MUNI requires little maintenance, aside from daily battery charging (see Section 2), regular filter replacement, and sensor replacement as needed (1 to 3 years depending on sensor and use conditions). The battery may need replacement after long service or extreme use conditions. 8.1 External Filter Use an external filter in environments with excessive dust or liquid aerosols. The filter attaches to the front housing covering all four sensor gas inlet ports.
MUNI User’s Guide 9. Troubleshooting Problem Possible Reasons & Solutions Reasons: Cannot turn on power after Defective USB cable or charging circuit. Defective battery. charging the battery Solutions: Try charging the battery again. Replace USB cable or charger. Solutions: Lost password Call Technical Support at (408) 320-1266 Reasons: Buzzer and/or other alarms disabled. Bad buzzer.
MUNI User’s Guide 10. Technical Specifications All specifications and listed sensors are subject to change without notice. Please check for updates at www.mpowerinc.com .
MUNI User’s Guide Technical Support and mPower Contacts mPower Electronics Inc. 3046 Scott Blvd. Santa Clara, CA 95054 Phone: (408) 320-1266 Fax: (669) 342-7077 info@mpowerinc.com www.mpowerinc.
