mPower Electronics VOXI User manual

VOXI
Fixed Photo-ionization Detectors
MP812 & MP815
User’s Guide
Rev 0.4
October, 2019

VOXI User’s Guide
1
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 Baseline 4 mA Signal Adjustment ..................................................................................................................10
3.3.2 MODBUS Message RTU Framing ...................................................................................................................10
4. Operation Overview ............................................................................................. 11
5. Controller Operations ........................................................................................... 11
5.1 Hardware and Software Requirements.............................................................................................................11
5.2 Connecting the VOXI to the Controller (Mobile Device)....................................................................................12
5.3 Operation Shortcut Buttons and Overview .......................................................................................................12
5.4 Field Service (Calibration, etc.)..........................................................................................................................13
5.5 VOXI Settings ....................................................................................................................................................16
5.6 View Operations Log.........................................................................................................................................17
6. Maintenance ........................................................................................................ 18
6.1 Replacing Filters................................................................................................................................................18
6.2 Removing/Cleaning/Replacing Lamp and Sensor .............................................................................................18
6.3 Replacing Pump ................................................................................................................................................20
7. Troubleshooting ................................................................................................... 21
8. Technical Specifications ........................................................................................ 22

VOXI User’s Guide
2
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 moved.
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.

VOXI User’s Guide
5
1. General Information
The VOXI is one of the most advanced fixed monitors available for ppb (parts per billion)
detection of VOC (Volatile Organic Compound). It operates on 12-30 VDC power and provides
various outputs including OLED digital read-out, 4-20 mA analog output, RS-485 digital output,
CAN or Modbus, 3 relays, and one port to an external strobe or horn. The VOXI offers
two models that measure from low ppb to a high range up to 5000 ppm for different applications.
Novel designs of the photo-ionization detector (PID) and ultraviolet (UV) lamp provide
outstanding sensitivity, stability and reproducibility. An on-board heater prevents condensation
at low temperatures. Configuration and testing is performed conveniently using a mobile App
and Bluetooth controller. Options include real time remote monitoring with a built-in wireless
modem using mPower Suite application software.
1.1 Key Features
•VOC emissions monitoring using innovative PID for performance & long life
•700 integrated gas correction factors
•0.001-200 ppm (MP812) and 0.01-5000 ppm (Mp815) ranges of VOC
•Outstanding linearity over full measurement range
•Auto-ranging and auto-zeroing
•5-second response time for 90% change (using isobutylene)
•Built-in pump for up to 30 meters sampling distance
•Size: 8.4 x 7.1 x 5.0 in (213 x 180 x 127 mm)
•Weight: 3.3 lbs. (1.5 kg)
•12-30 VDC power input
•OLED display for maximum visibility outdoors
•3 Relays, 4-20 mA, RS-485 and output to alarm strobe or horns
•Mobile App and Bluetooth controller for handy configuration and testing
•Wide temperature range of -40° to +70°C (-40° to 158°F) with built-in heater to prevent
condensation
•Rugged, explosion-proof housing with IP-66 rating
•Real-time remote wireless monitoring and alarm notification option

VOXI User’s Guide
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2. User Interface
The VOXI user interface consists one large OLED Display showing the gas concentration, one
status LED, two alarm LEDs, and various status icons. Calibration and other parameters are
programmed using the mPower Suite mobile App on a smart-phone or tablet.
Status
LED
Low
Alarm
LED
High
Alarm
LED
Power Supply,
Alarm, and Data
Output Wires
Electrical
Ground
Connector
Secondary Filter
(Inside Housing)
Water Trap
Filter
Gas Inlet
Wireless Signal
Strength
Bluetooth
Connection
Pump Status
Gas
Concentration
Unit
Concentration
Read-out
Measured Gas
Selection
Gas Outlet
Rain Cap
Lock Screw

VOXI User’s Guide
7
3. Installation
WARNING !
•The VOXI is currently not certified for use in hazardous gas locations. Install this unit only
in an area known to be free of combustible gases and vapors.
•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 on a regular basis.
•Remove the sensor only if necessary for repair. Zero and span calibration are required once
the sensor is moved.
3.1 Mounting
3.1.1 Mounting Location
For safety and ease of maintenance, the VOXI should be installed in a non-hazardous-gas
location.*
1
Extension tubing of up to 100 feet (30 m) can be attached to the inlet to allow remote
mounting if the sampling location contains flammable or toxic gas mixtures.
3.1.2 Mechanical Mounting Options
The VOXI is designed for wall mount or pole mount using the screw-holes provided, centered
5.25 inches or 134 mm apart. If mounted outdoors, ensure that the gas inlet is directed
downwards to minimize the chance of precipitation being drawn into the PID.
*
1
Future VOXI 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 is
easier to maintain if installed in a non-hazardous location or one that can be vented to remove hazardous gases
before opening the housing.

VOXI User’s Guide
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An optional mounting bracket (P/N M008-3004-000) is available that allows the unit to be offset
about 1 cm from the wall or pole.
3.2 Rain Cap
If mounted outdoors, the rain cap can be installed to further reduce the chance of precipitation
ingress. This cap also allows connection of tubing to the gas outlet if it is desired to vent the
exhaust away from the VOXI instrument.

VOXI User’s Guide
9
3.3 Electrical Connections
Two conduit holes are provided in the explosion-proof housing, one covered by a hex-head plug
and the other for wire connections. To unscrew and remove the cover, first loosen the lock screw
located on the side, using a Allen wrench. Pinch the buckles on both sides of the instrument
assembly to release and then lift it out. Unplug the three terminal block plugs on the PC board.
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. An external ground wire (AWG11 recommend) must be
connected to the VOXI housing reliably.
Terminal Blocks
Terminal
Block
Plugs
Lock Screw

VOXI User’s Guide
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3.3.1 Baseline 4 mA Signal Adjustment
If sending the 4-20 mA signal to a remote controller, during the field installation the VOXI
analog output should be adjusted. See VOXI Field Service section below for procedures.
3.3.2 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 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)

VOXI User’s Guide
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4. Operation Overview
Once installed and power is turned on, the VOXI runs continuously to measure VOCs, display
the concentration readout and any alarms (flashing LEDs), and send any output and alarm signals
connected to external devices. The pump runs intermittently when VOCs are below 500 ppb, in
order to extend the life of the filters and the pump itself, but runs continuously above this
threshold. The VOXI has an on-board heater which turns on at low temperature to reduce the
possibility of condensation in the PID sensor. Both the VOC threshold and temperature threshold
are set at the factory and cannot be adjusted by the user. Other operating parameters are set with
the controller.
5. Controller Operations
5.1 Hardware and Software Requirements
An external mobile phone or tablet is required as a controller to program operating parameters.
Currently Android 6.0 or higher platforms are supported. Updating to the latest Android version
is common practice and recommended. Use an Ex (Intrinsically safe) Android device if operating
in hazardous environments. Operation requires the mPower Suite Android App. If not already
installed, it can be downloaded at https://www.mpowerinc.com/software-downloads/ . The
Controller allows users to:
•Get and set VOXI configurations
•Perform calibrations
•Adjust the analog 4-20 mA output baseline
•Adjust the pump stop threshold
•Join an mLink wireless system
5.1.1 Supported Languages
English and Chinese.

VOXI User’s Guide
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5.2 Connecting the VOXI to the Controller (Mobile Device)
The system communicates wirelessly using Bluetooth Low Energy (BLE) signals when within
10 m (33 feet) distance.
1. To connect start the App, click on to search for nearby devices, and click the devicename.
2. Repeat to connect all the instruments. Up to 8 instruments can be connected to one Android
device.
5.3 Operation Shortcut Buttons and Overview
From the Active Device panel, click the shortcut buttons in the panel immediately below the
instrument icon to execute some frequent operations, without going into detailed operation
menus. The VOXI shortcut buttons are:
•Disconnect
•SPAN Calibration
•Zero Calibration
•Verifies Bluetooth connection
If the Bluetooth connection is lost, the device panel will be grey. Clicking on Bluetooth
Connection Status will attempt to reconnect.
Search for nearby devices
Click on the device name to
connect
Connect up to 8 instruments and
show Device Panels. Shortcut
buttons on bottom of each panel.

VOXI User’s Guide
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To enter the VOXI operations submenus, click on the device icon or the blank area to its right.
VOXI operations include “Field Service”, “Settings” and “Operations (Log)”. The App
automatically enters the "Field Service" screen.
5.4 Field Service (Calibration, etc.)
VOXI field services include
•Calibration
•Pump stop threshold setting
•4 mA Analog output baseline setting.
•Wireless device registration
VOXI Operations main screen

VOXI User’s Guide
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5.4.1 Calibration
1. Initiate a Zero Calibration by clicking on the icon. When prompted, supply clean air
to the inlet and click ‘Yes’ to start the count-down timer. If the VOXI is mounted in an area
where ambient air contains detectable VOCs, provide a clean air source a) by attaching a
charcoal filter, b) attaching a gas bag (e,g, Tedlar®bag) filled with about 1 liter of clean air
from a cylinder, or c) clean air directly from a cylinder fitted with either a demand-flow
regulator or a fixed-flow regulator of about 0.5 LPM.
2. Before zero or span calibration, it is good practice to examine the water trap filter and large
secondary filter inside the housing for cleanliness and replace as needed.
3. Initiate a Span Calibration by clicking on the icon. When prompted, supply span gas
to the inlet and click ‘Yes’ to start the count-down timer. Span gas can be supplied either
from a gas bag (e,g, Tedlar®bag) filled to at least 1 liter, or directly from a gas cylinder
fitted with either a demand-flow regulator or a fixed-flow regulator of about 0.5 LPM.
4. The Zero or Span Calibration can be aborted at any time during the countdown by click
on the gas bottle icon again while it is red.
5. Use of fixed-flow regulators below 0.5 LPM or above about 0.6 LPM will 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 inlet to allow excess gas flow to escape
without being forced through the instrument.
6. The Calibration Interval must be defined by the user because it depends on the
application and local conditions. We recommend starting with weekly bump tests to
check the response of the PID and need for filter changes, and then increasing the length of
time between checks and calibrations as experience is gained in the application. We
recommend no longer than 6-month intervals between calibrations.
Zero Calibration screen
Span Calibration screen
Aborting a Calibration

VOXI User’s Guide
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5.4.2 Configure Pump Stall Threshold
This feature protects the pump from burning out if there is a
flow blockage that is causing excessive strain on the pump.
Click "Start Setting" to show the pump current draw.
Then block the inlet and observe the current draw again.
Enter the average value between the blocked and unblocked
pump, and click "Set and Exit" to write the updated threshold
to the VOXI. If this threshold is exceeded, the pump will stop
and an alarm signal sent.
5.4.3 Configure 4 mA Output Baseline
If sending the 4-20 mA signal to a remote controller, during
the field installation the VOXI analog output baseline should
be adjusted. Click the button under "4 mA" to set the output.
Click the increase and/or decrease buttons to adjust and send
to the VOXI immediately.
: Click +1; Long Click +10.
: Click +100; Long Click +1000.
: Click -1; Long Click -10.
: Click -100; Long Click -1000.
5.4.4 Wireless Registration
The VOXI can be connected (registered) to a wireless network for communication up to 2 miles
(3 km) away using an mLink modem. First, put the mLink in the "Register Device" mode
(NOTE: this requires a separate mobile phone or tablet dedicated to the mLink). Then
click the "Start Register" button on the App to register this VOXI to the mLink. Registration
should be completed immediately, and the results displayed in the pane to the right of the button.

VOXI User’s Guide
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5.5 VOXI Settings
In the Settings menu the user can adjust various parameters such as
•Alarm limits
•Span gas type and concentration
•Measurement gas type
•Measurement concentration unit
•Modbus ID
•Wireless baud rate
NOTE: Firmware cannot be updated by the user.
From the main screen bottom panel click on the ‘Settings’ icon and then click “GET” to
display the VOXI configurations. After modifying the settings, click the "SET" button to send
the modifications to the VOXI.

VOXI User’s Guide
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5.6View Operations Log
Click "Operations" and select the date from the list at the bottom to view the daily operation log.

VOXI User’s Guide
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6. Maintenance
The VOXI requires regular filter replacement and possibly lamp & sensor cleaning if used in
areas of high dust or condensation. The pump may also need service and the expected
replacement period is about 2 years.
6.1 Replacing Filters
If the external filter is dirty or clogged, remove it by unscrewing it from the inlet. Discard it and
replace it with a new water-trap filter. Dirty filters can be recognized by symptoms such as:
•Visible filter discoloration
•Visible moisture accumulation
•Frequent pump stalls
We recommend filter replacement at least every month for instruments that are used regularly,
and more frequently, possibly daily, when used under very dusty or wet conditions.
IMPORTANT! The VOXI should not be operated without a filter. Operation without a filter
may damage the instrument and shorten the life of the pump, sensor and PID lamp.
6.2 Removing/Cleaning/Replacing Lamp and Sensor
WARNING!
Replace lamp or sensor only in non-hazardous locations.
IMPORTANT! Always perform a full calibration after removing lamp or sensor.
6.2.1 Accessing PID Sensor and Lamp
Loosen the lock screw and remove the cover. Pinch the buckles on each side of the assembly,
pull it out, and disconnect the wiring plugs. Remove the intake pipe (filter housing) from the
main body. Push the PID sensor module in towards the main body and lift it up and out.
Secondary Filter
(Inside Housing)
External Water
Trap Filter
Lock Screw
Disconnect
filter housing
from main
body

VOXI User’s Guide
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6.2.2 Lamp Cleaning and Changing
1. Remove the Sensor Cap and pull the sensor straight out, using a
slight rocking motion if necessary.
2. Put on finger gloves and pull out the lamp. It may help to use fine
tweezers; if so, do this very carefully so as not to damage the
lamp. Insert a new lamp, or clean the existing lamp as described
below.
3. Use a cotton swab wetted with methanol to clean the flat window
surface of the lamp. If greasy dirt is hard to remove using
methanol, the window can be polished using fine alumina powder
polishing paste.
4. Use a clean tissue to wipe the lamp window again.
5. Re-insert the cleaned lamp, plug in the sensor and replace the
sensor cap and VOXI cover.
6. Always re-calibrate the PID after cleaning the lamp and/or sensor.

VOXI User’s Guide
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6.2.3 Sensor Cleaning
1. Unscrew the sensor cover and pull the sensor straight out, using a
slight rocking motion if necessary.
2. Put the sensor into a beaker and cover it with pure methanol or
ethanol.
3. Put the beaker into an ultrasonic cleaning bath and sonicate
for 15 minutes. Take out sensor and dry it, preferably using a
gentle stream of clean air to blow the residual liquid out of
the sensor.
4. Always re-calibrate the PID after cleaning the sensor.
6.3 Replacing Pump
For replacement of pump, please contact an authorized mPower service center.

VOXI User’s Guide
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7. Troubleshooting
Problem
Possible Reasons & Solutions
Readings abnormally High
Reasons:
Dirty filter(s). Dirty sensor module. Excessive moisture or
water condensation. Incorrect calibration.
Solutions:
Replace filter(s). Clean or replace sensor module. Blow-dry
the sensor module. Calibrate the unit.
Readings abnormally Low
Reasons:
Dirty filter(s). Dirty sensor module. Weak or dirty lamp.
Incorrect calibration.
Solutions:
Replace filter(s). Clean or replace sensor module. Clean or
replace lamp. Calibrate the unit.
Pump fail message
Pump alarm
Reasons:
Inlet probe blocked. Direct connection to calibration gas
outlet before the regulator is opened. External filter plugged
with dirt or liquid. Water condensed in the internal gas
distribution lines. Bad pump or pump circuit.
Solutions:
Remove the blocking materials and re-start power. Replace
the contaminated filter(s). Be careful not to allow water
condensation inside the unit. Replace or rebuild the pump
(by Service Center).
Cannot communicate with
mobile device
Reasons:
Non-Android operating system.
Android OS before 6.0 or recent background update
Solutions:
Use Android mobile device.
Restore OS to that used before update (at least v 6.0)
Lost password
Solutions:
Call Technical Support at (408) 320-1266
For replacement parts please contact an authorized mPower Service Center.
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4
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