MP820 LEL Fixed Combustible Gas Detectors

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Product Information

Specifications

• Product Name: VOXI LEL Fixed Combustible Gas Detector
  MP820

• Model: MP820

• Revision: 1.1

• Date: February, 2024

Product Usage Instructions

1. General Information

This product manual must be read by all users responsible for
operating, maintaining, or servicing the VOXI LEL Fixed Combustible
Gas Detector to ensure proper functionality.

2. User Interface

The user interface of the VOXI LEL consists of a large LCD
display for gas concentration, a power status LED, alarm LEDs, and
a fault indicator LED. Calibration and parameter adjustments can be
done using a handheld IR remote programmer.

3. Installation

Follow these steps for proper installation of the VOXI LEL Fixed
Combustible Gas Detector:

1. Choose a suitable location for installation.
2. Mount the detector securely using appropriate hardware.
3. Connect power and any necessary communication cables.
4. Perform initial setup and calibration as per the user
   manual.

4. Operation

Operate the VOXI LEL Fixed Combustible Gas Detector as
follows:

1. Monitor the gas concentration displayed on the LCD.
2. Interpret alarm LEDs for any alerts.
3. Use the handheld remote programmer for calibration and
   parameter adjustments.

5. Maintenance

Regular maintenance is crucial for optimal performance:

1. Replace sensors as needed.
2. If required, replace the LCD or circuit board following
   manufacturer’s guidelines.

6. Troubleshooting

If issues arise, troubleshoot using the following steps:

1. Refer to the user manual for troubleshooting guidance.
2. Address 4-20 mA alarm signals promptly.

FAQ

Q: How often should the VOXI LEL be calibrated?

A: The VOXI monitor must be calibrated if it does not pass a
bump test, when a new sensor has been installed, or at least once
every 180 days, depending on use and sensor exposure to poisons and
contaminants.

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VOXI LEL
Fixed Combustible Gas Detectors
MP820 User’s Guide
Rev 1.1 February, 2024

VOXI LEL 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 ………………………………………………………………………………………………………………………………..8 3.3.3 Maximum Wiring Length ……………………………………………………………………………………………………………8 3.3.4 Baseline 4 mA Signal Adjustment…………………………………………………………………………………………………8 3.3.5 MODBUS Message RTU Framing …………………………………………………………………………………………………9
4. Operation ………………………………………………………………………………………………. 10
4.1 Standard Operation …………………………………………………………………………………………………………………………10 4.2 Programming using Hand-held Remote………………………………………………………………………………………………10
4.2.1 Battery Installation ………………………………………………………………………………………………………………….11 4.2.2 User Interface………………………………………………………………………………………………………………………….11 4.2.3 Navigating Menus and Sub-menus …………………………………………………………………………………………….11 4.2.4 Default Settings……………………………………………………………………………………………………………………….14 4.2.5 Default Gas and Measurement Gas ……………………………………………………………………………………………14 4.3 Calibration ……………………………………………………………………………………………………………………………………..15
5. Maintenance ………………………………………………………………………………………….. 17
5.1 Sensor Replacement…………………………………………………………………………………………………………………………17 5.2 LCD or Circuit Board Replacement ……………………………………………………………………………………………………..17
6. Troubleshooting ……………………………………………………………………………………… 18
6.1 4-20 mA Alarm Signals…………………………………………………………………………………………………………………….19
7. Technical Specifications ……………………………………………………………………………. 20 8. Replacement Parts…………………………………………………………………………………… 21
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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. The user should understand how to set the correct parameters and interpret the obtained results.
WARNINGS !
· Never operate the monitor when the cover is removed. · Remove the monitor cover only in an area known to be non-hazardous. · Use only mPower’s sensor and accessories. Substitution of components will impair
suitability for intrinsic safety and void warranty.
· The instrument should be calibrated after installation before initial use and checked by
exposing it to a known concentration calibration on a regular basis.
· Ensure that the gas inlet is not blocked. · Make sure that all filters are clean and replaced on a regular basis. · Remove the sensor only if necessary for repair. Zero and span calibration are required once
the sensor is removed and re-inserted or replaced.
Special Conditions for Safe Use
The VOXI monitor must be calibrated if it does not pass a bump test, when a new sensor has been installed, or at least once every 180 days, depending on use and sensor exposure to poisons and contaminants.
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VOXI LEL User’s Guide
1. General Information
The 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 (for Modbus) signal outputs are standard. Three sets of programmable relays allow triggering of external alarms such as a siren or visual beacon. Various applications include oil & gas, petrochemical, chemical, metallurgical, pharmaceutical, semiconductor, environmental monitoring, and other industry facilities.
1.1 Key Features
· Supporting catalytic combustion LEL sensors with identification and manufacturing data · Sensor diagnosis, temperature compensation and auto- zeroing · LCD with backlight that changes color according to alarm condition · Calibration due date notification · 3 Wires for 4-20 mA and RS485 ModBus output · Infrared remote programmer for settings, calibrations and adjustments · Error codes for easy troubleshooting · Recoverable factory settings · Overrange protection, reverse polarity protection · IP-67 rating · IECEx certification
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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.

Alarm LED
Gas Sensor Type

Power LED

Fault LED

Conduit Portal for Wiring
Grounding Point

Concentration Read-out
Grounding Point

Mounting Slot
Sensor Location

Mounting Slot

Gas Inlet

Rain Cap

Backlight changes color to indicate alarms or faults

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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
16/3SOOW cable for oil and water.
· Before installation, ensure that all power is disconnected. · Before removing the monitor cover for service, disconnect the power supply and ensure
that the area free of combustible gases and vapors.
· For European locations, installation must comply with EN-60079-14. · The instrument should be calibrated after installation before initial use and checked by
exposing it to a known concentration calibration gas on a regular basis.
· Remove the sensor only if necessary for repair. Zero and span calibration are required once
the sensor is removed and re-inserted or replaced.
3.1 Mounting
3.1.1 Mounting Location Because the VOXI LEL samples by diffusion, it should be installed directly in the area to be measured.1 For an entire room to be monitored, there is a reliance on good air circulation within the room, since the VOXI can only measure in the immediate vicinity of its inlet. If the VOXI must be mounted remotely, the gas must be pumped to the inlet because it has no sampling pump of its own. 3.1.2 Mechanical Mounting Options The VOXI LEL is designed for wall mount or pole mount using the screw-holes provided, centered 5.25 inches or 134 mm apart. An optional mounting bracket (P/N M024-3003-000) is available that allows the unit to be offset about 1 cm from the wall or pole. If mounted outdoors, ensure that the gas inlet is directed downwards and the raincap is installed to minimize the chance of precipitation entering the sensor inlet. The shape and dimensions of VOXI are shown in the figure below:
1 Future VOXI LEL versions that have certifications will be able to be installed and operated in hazardous-gas locations, but because the housing cannot be opened for service in the presence of flammable gases, the VOXI LEL is easier to maintain if installed in a non-hazardous location or an area that can be vented to remove hazardous gases before opening the housing.
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Front View

VOXI LEL User’s Guide
Side View

Wall Mount Pole Mount
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.
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Bracket Dimensions (mm)

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. Pinch the buckles on both sides of the instrument assembly to release and then lift it out. Unplug the sensor plug from the PC board.

Sensor Plug

Sensor Plug

Lock Screw

The schematic below shows the internal wiring connections. Insert the wire through the conduit hole and connect to the corresponding pin numbers of the three terminal blocks on the bottom of the assembly. These blocks accept 12AWG to 24AWG wire (0.2 to 4.0 mm2). Input power requirements are <5W, 12-30 VDC and should be connected between Terminals 14-GND and 15-V+.

Terminal Blocks
Alarm outputs on Terminals 6-9 are normally-open dry contacts that close on alarm. The 4-20 mA output should be connected to Terminals 13 and 14. RS485 should be connected to terminals
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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).

Internal Grounding Point

External Grounding Points

3.3.3 Maximum Wiring Length

The maximum signal transmission distance can be estimated from the resistance of the shielded cable, allowing for a maximum of 150 , as shown below (actual maximum distance may vary).

Cross-sectional Area

mm2

AWG

1.0

17

1.5

15

2.5

13

Resistance (/yd)

Wire

Loop

0.0165

0.0329

0.0110

0.0220

0.0067

0.0135

Maximum Distance (miles)
2.6 3.9 6.3

WARNING !
The VOXI EC has NO HAZARDOUS GAS CERTIFICATION when used with 16/3SOOW cable for oil and water.

3.3.4 Baseline 4 mA Signal Adjustment
If sending the 4-20 mA signal to a remote controller, during the field installation the VOXI LEL analog output should be adjusted. See VOXI LEL Programming section below for procedures.

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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/ and 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. This allows devices that receive a new frame to begin at the start of the message, and to know when the message is completed. Partial messages must be detected and errors must be set as a result. In RTU mode, message frames are separated by a silent interval of at least 3.5 character times. In the following sections, this time interval is called t3,5.
RTU Message Frame The entire message frame must be transmitted as a continuous stream of characters. If a silent interval of more than 1.5 character times occurs between two characters, the message frame is declared incomplete and should be discarded by the receiver.
Remark: The implementation of RTU reception driver may imply the management of a lot of interruptions due to the t1.5 and t3.5 timers. With high communication baud rates, this leads to a heavy CPU load. Consequently, these two timers must be strictly respected when the baud rate is equal to or lower than 19200 Bps. For baud rates greater than 19200 Bps, fixed values for the 2 timers should be used: it is recommended to use a value of 750 µs for the inter-character time-out (t1.5) and a value of 1.750 ms for inter-frame delay (t3.5)
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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. When an alarm level is exceeded, the Alarm LED flashes and the display backlight changes color.
4.2 Programming using Hand-held Remote
Configuring and calibrating the VOXI LEL is done using a handheld remote programmer. There is no magnetic key or other means of programming the VOXI LEL directly. Communication with the transmitter functions from up to 3 m (10 ft) distance when directed straight at the transmitter display instead of from an angle.
WARNING !
· VOXI LEL monitoring is turned off during communication with external devices. · Perform programming and calibrations only during times known to be free of toxic or
combustible gases and vapors.
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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. Program operations can be selected using the cursor movement arrows. Shortcut operations can be conducted using the Zero and Span buttons to quickly perform routine zero and span calibrations. The firmware is factory-set and currently cannot be changed by the user.
4.2.3 Navigating Menus and Sub-menus Press the Main Menu Access button and use the Up and Down arrows to scroll through the menu. Use the Right and Left arrows to enter or exit a menu item. When entering numerical values, use the Left or Right arrows to move the cursor, and the Up and Down arrows to increase or decrease the values, When the cursor is moved to the “?”, press OK to save or enter. To exit a sub-menu, press the cancel key . To exit the Main Menu, scroll down to the EXIT screen and press OK. The display will also automatically return to concentration readings after about a minute of non- use.
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Enter the menu:

VOXI LEL User’s Guide

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.
· Advanced Menu is accessed using default Password 8888. This allows access to additional advanced features such as changing passwords, changing concentration units, setting location ID, etc.

The Basic Menu and sub-menus are listed below

Display

Main Menu

Sub-Menu 1

Sub-Menu 2

CAL ALM CF COMM EXIT

Calibration

Zero Calib

Span Calib

Set Alarm Limits

Low Alarm

High Alarm

Set Correction Factor

Communicate to PC (Factory & Service use only)

Exit

Sub-Menu 3 Set Span Value

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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

CAL ALM CF PSWD BPS 4_20 SITE RST COMM EXIT

Calibration

Zero Calib

Span Calib

Set Alarm Limits

Low Alarm

High Alarm

Set Correction Factor

Set Password

Basic Password Adv. Password

Set Baud Rate

4-20 mA Adjust 4 mA Adjustment 20 mA Adjustment

Set Site ID

_

Reset to Default Values

Communicate to PC (Factory & Service use only)

Exit Programming

Set Span Value Range

The Advanced Main Menu path is shown below

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VOXI LEL 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 measured gas is different from the calibration gas.

Password (PSWD) Change the passwords for either Basic or Advanced configurations.

Baud Rate (BPS) The Baud Rate options are 4800, 9600 and 19200 bps and should be set to match that used in the MODBUS messaging protocol.

Analog Output (4_20) If sending the 4-20 mA signal to a remote controller, during the field installation the VOXI analog output baseline should be adjusted. Read the current on terminal 13 using an ammeter while adjusting the raw counts. The default values are 530 counts for 4 mA (0 ppm) and 2600 counts for 20 mA. No gas needs to be applied during these operations.

Site ID (SITE) Label the station or location.

Reset (RST) Reset all parameters to their default values.

Communication (COMM) Communication to PC for firmware upgrade, sensor firmware change, Modbus setting, etc. This feature requires special software currently available only to authorized service centers.

4.2.4 Default Settings

Sensor LEL

Span Value 50% LEL

Low Alarm 10% LEL

High Alarm 20% LEL

4.2.5 Default Gas and Measurement Gas Four VOXI LEL versions are available with default gas selections of methane, propane, butane or hydrogen. These all use the same pellistor-type combustible gas sensor and are simply calibrated with the respective gas at the factory. The user should calibrate using the same gas in the field, in which case the correction factor should be left at its default value of 1.0 and there is no need to change it.
Alternatively, if only methane calibration gas is available and a different gas needs to be measured, the sensor can be calibrated to methane and programmed with a correction factor (CF) as listed in TA Note 7 available on the mPower website Technical / Application Notes | mPower Electronics Inc. (mpowerinc.com). Note that it is always most accurate to calibrate with the compound of interest because cross-sensitivities can vary from sensor to sensor and with time as a single sensor ages.

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4.3 Calibration

VOXI LEL User’s Guide

Calibration Cup

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” button on the programmer. Supply clean air to the inlet. If the VOXI EC is mounted in an area where ambient air contains detectable concentrations of gases, attach the calibration cup and supply clean gas (air) directly from a cylinder fitted with a fixed-flow regulator of about 0.3-0.6 LPM. If no calibration cap is available, the rain cap may be used. Connect the zero gas directly to the rain cap. 3. For Oxygen sensors, the zero gas is ambient air (20.9% O2) and the default span gas is 18% O2, but span can be changed to 0% O2 for inert atmosphere applications. 4. Click OK’ to initiate the 30-second count-down timer, after which Pass or Fail is displayed. ClickOK’ to move to Span or continue to Exit. 5. To abort, press during the count-down.

Or, using the short-cut Zero button on the remote programmer:
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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. Attach the calibration cup and supply span gas directly from a gas cylinder fitted with a fixed-flow regulator of about 0.3-0.6 LPM to the inlet. Click `OK’ to initiate the count-down timer, after which Pass or Fail is displayed. The count-down time depends on the type of sensor and is typically about 45 seconds.
8. To abort, press during the count-down. 9. Use of fixed-flow regulators below 0.3 LPM or above about 0.6 LPM may cause poor
calibration. A regulator with flow higher than 0.6 LPM can be used if an open T fitting is placed in line between the regulator and VOXI LEL inlet to allow excess gas flow to escape without being forced through the instrument. 10. The Calibration Interval should be at least every 6 months. However, the interval must be defined by the user and may be shorter because it depends on the application and local conditions. We recommend starting with weekly bump tests to check the response of the sensor and need for filter changes, and then increasing the length of time between checks and calibrations as experience is gained in the application. In all cases calibration should be performed at least every 180 days. See mPower TA Note 3 for more details.
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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. Pellistor LEL sensors are subject to inhibition or poisoning if exposed to compounds such as silicone lubricants, chlorinated compounds, sulfur compounds and acid gases and may require more frequent replacement when used in such environments. Response loss to poisons can sometimes be recovered by exposure to 100 %Vol methane for a few seconds or 20 %Vol methane for 5-10 seconds. This procedure raises the sensor temperature enough to burn off the surface and recover sensitivity. Longer exposure times do not help much because oxygen is needed for the process, but repeating the process once or twice may help (see TA Note 7 for more details).
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. For replacement, the entire sensor must be disconnected from the circuit board and unscrewed from the housing.
Lock Screw
Replace sensor only in non-hazardous environments. 1. Remove the rain cap (if used), unscrew the enclosure cap, and remove the LCD/circuit board
assembly. 2. Disconnect the sensor cable plug from the LCD/circuit board assembly. 3. Using a large wrench, unscrew the LEL sensor from the enclosure. 4. Screw in a new LEL sensor assembly, tighten to the enclosure, and reassemble in reverse
order. IMPORTANT! Always perform a full calibration after removing a sensor.
5.2 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 above.
Disconnect the wiring plugs 2. Replace the Circuit Board/LCD assembly and re- assemble in reverse order.
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VOXI LEL User’s Guide

6. Troubleshooting

Problem
Error Code E001 Error Code E002 Error Code E003
Error Code E004
Error Code E005
Readings abnormally High
Readings abnormally Low
Cannot communicate with IR Programmer Lost password

Possible Reasons & Solutions Reason: Firmware does not support model type
Solution: Install correct firmware Reason: Sensor Error Solution: Check or replace sensor Reason: Different (supported) sensor type installed Solution: Install original type sensor. Or if type change is desired, restart power and confirm sensor type change upon queries SEN CHG? and SURE? Reason: Sensor unsupported or not match factory setting
Solution: Replace sensor with a supported type or upgrade to firmware that supports the sensor Reason: Calibration data invalid and no default factory
calibration data Solution: Calibrate properly or return unit for factory calibration Reasons: Dirty inlet. Dirty sensor module. Excessive moisture or water condensation. Incorrect calibration. Cross-sensitive gases present. High correction factor (CF). Solutions: Clean or replace sensor module. Re- calibrate the unit. Install in area without cross-sensitive gases. Check CF. Reasons: Weak or dirty sensor. Incorrect calibration. Insufficient oxygen present. Low correction factor (CF). Solutions: Clean or replace sensor module. Burn off poisons by exposing sensor to 100% methane for a few seconds with power on. Re-calibrate the unit. Ensure at least 5% Vol oxygen is present. Check CF. Reasons: Programmer battery dead. Pointing from angle. Solutions: Replace battery. Point straight at VOXI. Solutions: Call Technical Support at 408-320-1266

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VOXI LEL 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 0 mA 1 mA 2mA
3mA 4~20mA
22mA

Condition
Off or booting up during the start-up sequence. Warm up mode (for certain sensors like IR or some reactive toxic gases) Any “FAULT” condition that may cause a bad output from the sensor, or potential threat to impact sensor output, including: 1) Hardware failures: including pump, sensor, any other hardware failures.
Low input voltage, main power lost (if with backup battery), sensor NEG, sensor removed, etc. 2) CAL failure Transmitter is in menu, including in “Cal” mode during Zero or Span Cal 4mA: Sensor reading 0 20mA: Sensor reading full scale Over-Range Fault when reading is 10% over full scale.

NOTE: If a Cal Failure has been corrected with a good calibration after the cause is corrected, everything should proceed
normally. If parts are replaced while the transmitter is off, it should still be in Cal Failure until a good calibration is performed after restart. Exception: If the sensor is replaced and the calibration data are stored on the sensor microprocessor, then it will likely reboot with no fault. However, it will still be preferable to perform a good calibration for the local ambient atmosphere and conditions.

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VOXI LEL User’s Guide
7. Technical Specifications
All specifications are subject to change without notice. Please check for updates at www.mpowerinc.com .
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VOXI LEL User’s Guide
8. Replacement Parts
Description LEL Pellistor Sensor Module IR Bluetooth Remote Programmer MP220 for VOXI EC/LEL Mounting Kit for VOXI EC/LEL Rain/Mud/Splash Cap for VOXI EC/LEL Calibration Cap for VOXI EC/LEL Enclosure , explosion-proof, for VOXI EC/LEL incl. housing bottom, top & O-ring Enclosure connector, 3/4″ NPT for VOXI EC/LEL Replacement circuit board/LCD Assembly for VOXI LEL Power Supply, 120-240VAC to 24-VDC, 1 W, with US wall plug for non-hazardous locations * Prices subject to change. Check the latest Price Guide for current pricing.

Part Number
M082-0010-000 M024-0901-000 M024-3003-000 M024-3006-000 M024-3005-000 M024-3008-000 M490-0146-000 M026-3001-000
M500-0039-000

List Price*
$300.00 $60.00 $60.00 $15.00 $10.00 $200.00 $20.00 $150.00
$35.00

LEL Sensor Module

Main PC board with LCD display assembly

Calibration Cap IR Programmer Mounting bracket
Rain Cap

VOXI Enclosure Enclosure Connector
(circled in red)

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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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References

• Gas detector, alarm systems equipment supplier

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