Related Manuals for mPower Electronics VOXI LEL MP820
Summary of Contents for mPower Electronics VOXI LEL MP820
- Page 1 VOXI LEL Fixed Electrochemical Gas Detectors MP820 User’s Guide Rev 1.0 January, 2024...
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Page 2: Table Of Contents
VOXI LEL User’s Guide Contents 1. General Information ....................5 1.1 Key Features ..............................5 2. User Interface ......................6 3. Installation........................7 3.1 Mounting ..............................7 3.2 Rain Cap ..............................8 3.3 Electrical Connections ..........................9 3.3.1 Internal Wiring ............................ 9 3.3.2 Grounding ............................ - Page 3 VOXI LEL 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.
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Page 4: General Information
VOXI LEL User’s Guide 1. General Information VOXI LEL MP820 is a point-type combustible gas transmitter designed with pellistor sensor technology and an integral flameproof enclosure for fixed applications. The versatile platform offers auto-zeroing and offline calibration. Three-wire 4-20 mA analog and RS485 digital signal outputs are standard, while wireless output is optional. -
Page 5: User Interface
VOXI LEL User’s Guide 2. User Interface The VOXI user interface consists of one large LCD Display showing the gas concentration, a power status LED, an alarm LEDs, and a fault indicator LED. Calibration is performed and operating parameters are entered using a handheld IR remote programmer. Power Fault Alarm... -
Page 6: Installation
VOXI LEL User’s Guide 3. Installation WARNINGS ! • The VOXI LEL has CNEX and IECEx certifications for use in hazardous gas locations. Check for certification requirements before installing. • The VOXI LEL has NO HAZARDOUS GAS CERTIFICATION when used with 163500 cable for oil and water. -
Page 7: Rain Cap
VOXI LEL User’s Guide Side View Front View Wall Mount Pole Mount Bracket Dimensions (mm) 3.2 Rain Cap If mounted outdoors, the rain cap should be installed to reduce the chance of precipitation ingress. If mounted indoors, the rain cap may be removed. -
Page 8: Electrical Connections
VOXI LEL User’s Guide 3.3 Electrical Connections 3.3.1 Internal Wiring Four openings are provided in the explosion-proof housing, covered by hex-head plugs which can be removed to attach conduit for remote wiring, alarm beacon, antenna, and/or other wire connections. For internal connections, unscrew and remove the cover by first loosening the lock screw located on the side, using an Allen wrench. -
Page 9: Grounding
VOXI LEL User’s Guide 10 & 12, and terminal 11 is for the RS485 shielding line. The +V terminals 5 and 15 are equivalent and internally connected, as are GND terminals 11 and 14. 3.3.2 Grounding The internal ground point is shown in the left figure below. An external ground wire (AWG11 recommend) should be connected to the VOXI housing (right figure below). -
Page 10: Modbus Message Rtu Framing
VOXI LEL User’s Guide 3.3.5 MODBUS Message RTU Framing The VOXI uses RTU framing for MODBUS messages. The following is an excerpt of the MODBUS over Serial Line Specification and Implementation Guide v1.02 (Dec.2006) with more information available at http://www.modbus.org/ http://www.modbus.org/specs.php A MODBUS message is placed by the transmitting device into a frame that has a known beginning and ending point. -
Page 11: Operation
VOXI LEL User’s Guide 4. Operation 4.1 Standard Operation Once installed and power is turned on, the VOXI LEL cycles through a start-up sequence (below). After start-up, the VOXI LEL samples the gas by diffusion and runs continuously to measure the toxic gas (or oxygen), display the concentration readout and any alarms, and send any output and alarm signals to external devices. -
Page 12: Battery Installation
VOXI LEL User’s Guide 4.2.1 Battery Installation The remote programmer uses a CR2025 3V battery or equivalent. To remove or replace the battery, place the unit face down, push the retaining hook inward and slide out the battery holder. Retaining Hook 4.2.2 User Interface Press the Main Menu Access button on the Remote Programmer to display the user interface on the VOXI LCD. - Page 13 VOXI LEL User’s Guide Enter the menu: Enter the password and press OK: Scroll through the menu: Exit the menu: BASIC and ADVANCED Menus There are two menus • Basic Menu is accessed using default Password 0000. This allows basic field operations such as calibration, setting alarm levels, and communication with PC for firmware upgrades.
- Page 14 VOXI LEL User’s Guide The table below lists all Advanced Menus and their sub-menus. Display Main Menu Sub-Menu 1 Sub-Menu 2 Sub-Menu 3 Calibration Zero Calib Span Calib Set Span Value JOIN* Join Wireless Network Set Alarm Limits Low Alarm High Alarm Range Set Correction Factor...
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Page 15: Default Alarm Settings
VOXI LEL User’s Guide Calibration (CAL) Perform zero and span calibrations. See the following Calibration Section for details. Join Network (JOIN) Join a wireless network for communication up to 1 mile (1.6 km) away using an mLink modem. This menu is visible only with wireless systems. Alarm (ALM) Set the numerical values for the low and high alarm limits. -
Page 16: Calibration
VOXI LEL User’s Guide 4.3 Calibration Calibration Zero or Span Gas Supply Rain Cap Alternative 1. Before calibration, it is good practice to examine the inlet filter and replace as needed. 2. Zero Calibration: Scroll to the CAL ZERO menu. Alternatively, press the short-cut “Zero”... - Page 17 VOXI LEL User’s Guide 6. Span Calibration: Scroll to the CAL SET menu and ensure that the Span Gas setting matches the concentration of the gas in the calibration cylinder. 7. Scroll to the CAL SPAN sub-menu. Alternatively, press the short-cut “Span” button on the programmer.
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Page 18: Maintenance
VOXI LEL User’s Guide 5. Maintenance The VOXI LEL requires regular sensor replacement if used in areas of high dust or condensation. Sensor life is typically 1-2 years depending on operating conditions. 5.1 Sensor Replacement To comply with intrinsic safety requirements, the LEL sensor comes completely sealed with the inlet metal frit and the wiring plug. -
Page 19: Troubleshooting
VOXI LEL User’s Guide 6. Troubleshooting Problem Possible Reasons & Solutions Reason: Sensor Error E002 Error Code Solution: Check or replace sensor Reason: Unsupported Sensor E003 Solution: Replace sensor with a supported type or upgrade Error Code to firmware that supports the sensor Reasons: Dirty inlet. -
Page 20: Technical Specifications
VOXI LEL User’s Guide 7. Technical Specifications All specifications are subject to change without notice. Please check for updates at www.mpowerinc.com... -
Page 21: Replacement Parts
VOXI LEL User’s Guide 8. Replacement Parts Description Part Number List Price LEL Pellistor Sensor Module M082-0010-000 $300.00 IR Bluetooth Remote Programmer MP220 for VOXI EC/LEL M024-0901-000 $60.00 Mounting Kit for VOXI EC/LEL M024-3003-000 $60.00 Rain/Mud/Splash Cap for VOXI EC/LEL M024-3006-000 $15.00 Calibration Cap for VOXI EC/LEL... - Page 22 VOXI LEL User’s Guide Technical Support and mPower Contacts mPower Electronics Inc. 2910 Scott Blvd. Santa Clara, CA 95054 Phone: (408) 320-1266 Fax: (669) 342-7077 info@mpowerinc.com www.mpowerinc.com...
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