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Summary of Contents for mPower Electronics VOXI EC MP840
- Page 1 VOXI EC Fixed Electrochemical Gas Detectors MP840 User’s Guide Rev 1.1 February, 2024...
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Page 2: Table Of Contents
VOXI EC User’s Guide Contents 1. General Information ....................3 1.1 Key Features ................................ 3 2. User Interface ......................4 3. Installation ......................5 3.1 Mounting ................................5 3.2 Rain Cap ................................6 3.3 Electrical Connections ............................7 3.3.1 Internal Wiring ............................7 3.3.2 Grounding .............................. - Page 3 VOXI EC 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 EC User’s Guide 1. General Information VOXI EC MP840 is a point-type toxic gas transmitter designed modularly with smart electrochemical sensor technology and an integral flameproof enclosure for fixed applications. The versatile platform offers more than 10 sensor options with auto-zeroing and offline calibration. -
Page 5: User Interface
VOXI EC 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 EC User’s Guide 3. Installation WARNINGS ! • The VOXI EC has CNEX and IECEx certifications for use in hazardous gas locations. Check for certification requirements before installing. • The VOXI EC has NO HAZARDOUS GAS CERTIFICATION when used with 16/3SOOW cable for oil and water. -
Page 7: Rain Cap
VOXI EC 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 EC 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 EC 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 EC 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 EC User’s Guide 4. Operation 4.1 Standard Operation Once installed and power is turned on, the VOXI EC cycles through a start-up sequence (below). After start-up, the VOXI EC 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 EC User’s Guide 4.2.1 Battery Installation The remote programer 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 EC 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 EC 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 Set Alarm Limits Low Alarm High Alarm Set Correction Factor PSWD Set Password Basic Password...
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Page 15: Default Settings
VOXI EC User’s Guide Calibration (CAL) Perform zero and span calibrations. See the following Calibration Section for details. Alarm (ALM) Set the numerical values for the low and high alarm limits. Correction Factor (CF) A correction factor can be used when the calibration gas is different from the measured gas. Password (PSWD) Change the passwords for either Basic or Advanced configurations. -
Page 16: Calibration
VOXI EC 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 EC 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 EC User’s Guide 5. Maintenance The VOXI EC requires regular filter replacement and possibly sensor replacement if used in areas of high dust or condensation. Sensor life is typically 1-3 years depending on sensor type. 5.1 Filter Replacement If the inlet filter is dirty or clogged, discard it and replace it with a new filter. Dirty filters can be recognized by symptoms such as: •... -
Page 19: Lcd Or Circuit Board Replacement
VOXI EC User’s Guide 5.3 LCD or Circuit Board Replacement The entire LCD/Circuit board assembly must be replaced as a unit as they cannot be separated, as follows: 1. Open the housing and remove the cover and circuit board/LCD assembly as described in Section 3 for wiring. -
Page 20: Troubleshooting
VOXI EC User’s Guide 6. Troubleshooting Problem Possible Reasons & Solutions Reason: Firmware does not support model type E001 Error Code Solution: Install correct firmware Reason: Sensor Error E002 Error Code Solution: Check or replace sensor Reason: Different (supported) sensor type installed Solution: Install original type sensor. -
Page 21: Ma Alarm Signals
VOXI EC User’s Guide 6.1 4-20 mA Alarm Signals To aid in troubleshooting, in addition to display text and LEDs, the 4-20 mA output identifies some alarms, as follows: 4-20 mA Signal Condition 0 mA Off or booting up during the start-up sequence. 1 mA Warm up mode (for certain sensors like IR or some reactive toxic gases) Any “FAULT”... -
Page 22: Technical Specifications
VOXI EC User’s Guide 7. Technical Specifications All specifications are subject to change without notice. Please check for updates at www.mpowerinc.com... -
Page 23: Replacement Parts
VOXI EC User’s Guide 8. Replacement Parts Description Part Number List Price* 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 M024-3005-000 $10.00 Inlet Filters for VOXI EC (pack of 10) - Page 24 VOXI EC 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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