mPower Electronics POLI User manual

POLI
Multi-Gas Meters
Service Manual
Version 1.37
September 2023

POLI Service Manual
1
Contents
General Information......................................................................................................................................4
Maintenance..................................................................................................................................................4
Replacing Filters..........................................................................................................................4
Checking Sensor Strength in Diagnostic Mode...........................................................................5
Removing or Replacing Sensor Modules....................................................................................7
Cleaning or Changing PID Sensor Detector or Lamp .................................................................8
PID Lamp Cleaning.................................................................................................................8
PID Sensor Detector Cleaning ................................................................................................8
Sampling Pump............................................................................................................................9
Pump Stall Setting...................................................................................................................9
Pump Service Procedures........................................................................................................9
Gas Inlet.....................................................................................................................................11
Housing Filters ..........................................................................................................................12
Battery Replacement..................................................................................................................13
LCD Replacement .....................................................................................................................14
Troubleshooting.........................................................................................................................15
Replacement Parts .....................................................................................................................16
Contact Information....................................................................................................................................17

POLI Service Manual
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.
CAUTION！
•REMOVE MONITOR COVER ONLY IN AREA KNOWN TO BE NON-HAZARDOUS.
•RECHARGE BATTERY ONLY IN AN AREA KNOWN TO BE NON- HAZARDOUS.
•USE ONLY mPOWER’S RECHARGEABLE LITHIUM BATTERY P/N M004-3002-000.
•USE OF NON-mPower COMPONENTS WILL VOID THE WARRANTY AND CAN
COMPROMISE THE SAFE PERFORMANCE OF THIS PRODUCT
•SUBSTITUTION OF COMPONENTS MAY IMPACT INTRINSIC SAFETY.
CAUTION: HIGH OFF-SCALE READINGS MAY INDICATE AN EXPLOSIVE
CONCENTRATION. ANY RAPID UP-SCALE READING FOLLOWED BY A DECLINING
OR ERRATIC READING MAY INDICATE A GAS CONCENTRATION BEYOND UPPER
SCALE LIMIT WHICH MAY BE HAZARDOUS.
ATTENTION: DES LECTURES SUPÉRIEURES A L’ÉCHELLE PEUVENT INDIQUER
DES CONCENTRATIONS EXPLOSIVES. TOUTE LECTURE RAPIDE ET POSITIVE,
SUIVIE D’UNE BAISSE SUBITE AU ERRATIQUE DE LA VALEUR, PEUT INDIQUER
UNE CONCENTRATION DE GAZ HORS GAMME DE DÉTECTION QUI PEUT ÊTRE
DANGEREUSE.
WARNINGS !
ONLY THE COMBUSTIBLE GAS DETECTION PORTION OF THIS INSTRUMENT HAS
BEEN ASSESSED FOR PERFORMANCE.
UNIQUMENT, LA PORTION POUR DÉTECTOR LES GAZ COMBUSTIBLES DE CET
INSTRUMENT A ÉTÉ ÉVALUÉE.
CAUTION: BEFORE EACH DAY’S USE, THE SENSITIVITY OF THE COMBUSTIBLE
GAS SENSOR MUST BE TESTED ON A KNOWN CONCENTRATION OF METHANE
GAS EQUIVALENT TO 20 TO 50% OF FULLSCALE CONCENTRATION. ACCURACY
MUST BE WITHIN 0 AND +20% OF ACTUAL. ACCURACY MAY BE CORRECTED
BY A CALIBRATION PROCEDURE.
ATTENTION: AVANT CHAQUE UTILISATION JOURNALIERE VERIFIER LA
SENSIBILITE AVEC UNE CONCENTRATION CONNUE DE METHANE EQUIVALENTE
A 20-50% DE LA PLEINE ECHELLE. LA PRECISION DOIT ETRE COMPRISE ENTRE
0-20% DE LA VALEUR VRAIE ET PEUT ETRE CORRIGEE PARUNE PROCEDURE
D’ETALONNAGE.

POLI Service Manual
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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.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This equipment generates, uses and can radiate radio
frequency energy and, if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or television reception,
which can be determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
•Reorient or relocate the receiving antenna.
•Increase the separation between the equipment and receiver.
•Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
•Consult the dealer or an experienced radio/TV technician for help.
Special Conditions for Safe Use
•The POLI multi-gas detector 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
•No precautions against electrostatic discharge are necessary for portable equipment that has
an enclosure made of plastic, metal or a combination of the two, except where a significant
static-generating mechanism has been identified. Activities such as placing the item on a belt,
operating a keypad or cleaning with a damp cloth, do not present a significant electrostatic
risk. However, where a static-generating mechanism is identified, such as repeated brushing
against clothing, then suitable precautions shall be taken, e.g., the use of anti-static footwear.
Note: Users are recommended to refer to ISA -RP12.13, Part II-1987 for general information on
installation, operation, and maintenance of combustible gas detection instruments.
Proper Product Disposal at the End of Life
The Waste Electrical and Electronic Equipment (WEEE) directive (2002/96/EC) is
intended to promote recycling of electrical and electronic equipment and their
components at end of life. This symbol (crossed-out wheeled bin) indicates separate
collection of waste electrical and electronic equipment in the EU countries. This
product may contain one or more Nickel-metal hydride (NiMH), Lithium-ion, or
Alkaline batteries. Specific battery information is given in this user guide. Batteries
must be recycled or disposed of properly. At the end of its life, this product must
undergo separate collection and recycling from general or household waste. Please use
the return and collection system available in your country for the disposal of this
product.

POLI Service Manual
4
General Information
The POLI multi-gas detectors (MP400 & MP400P) offer 4- or 5-gas monitoring of oxygen (O2),
combustible (LEL) gases, toxic gases, carbon dioxide (CO2), and volatile organic compounds (VOCs).
The MP400 is a diffusion sampling model with standard O2, LEL, carbon monoxide (CO) and
hydrogen sulfide (H2S) configuration. A firefighter version uses O2, LEL, CO and hydrogen cyanide
(HCN) sensors, and a 5-gas version including sulfur dioxide (SO2) is also avaliable. The MP400P is a
standard model with pump and allows a full selection of sensors, e.g. over 15 different electrochemical
(EC) sensors, pellistor for LEL, non-dispersive infrared (NDIR) for hydrocarbons in both LEL and
Vol% range and photo-ionization detector (PID) for VOCs. The MP400S and MP400H are pumped
and diffusion multi-gas meters used in wireless networks.
This Service Manual describes the advanced maintenance and repair operations not given in the
standard User’s Guide. To perform the operations described herein it is assumed that the service
technician is already famliar with the User’s Guide, including simple maintenance, firmware
configurations and mPower Suite software operations.
Maintenance
The POLI requires little maintenance, aside from daily battery charging, regular filter replacement, and
sensor replacement as needed (1 to 3 years depending on sensor and use conditions). Under extreme
conditions, the pump or battery may need service or replacement.
Replacing Filters
External Filter
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
•Frequent pump stalls
•A high pump current (I) value shown in the Pump Stall menu
We recommend filter replacement at least every month for instruments that are used regularly, and
more frequently, possibly daily, when used under dusty or wet conditions.
Internal Sintered Filter:
New models of POLI shipping beginning late 2023 have a secondary internal filter added to protect the
monitor in case the external water trap filter is lost or disconnected. This filter should be replaced or
cleaned if the monitor flow rate or sensor response decreases notably.
Unscrew the Water Trap
Filter
Unscrew the Luer Inlet/
Filter Retainer
Luer/Filter Retainer
Remove or Replace
Sintered Filter as Needed

POLI Service Manual
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Incompatible Chemicals:
The sintered filter should NOT be used with chemicals that may react with it and thus be depleted by
it. Incompatible chemicals include: HCl, HF, Cl2, ClO2, O3, and NO2. Acceptable chemicals include
most VOCs, O2, CH4, CO2, CO, H2, H2S, NH3, HCN, NO, N2O, PH3, SO2, ETO, THT and methyl
mercaptan.
IMPORTANT! A pumped POLI should not be calibrated or operated without a filter. Operation
without a filter may damage the instrument. The only exception to this requirement is for use with
reactive gases that may be partially lost on the filter.
Housing Filters
To replace the filters above each sensor on the front housing, see the separate section entitled “Housing
Filters” below.
Checking Sensor Strength in Diagnostic Mode
Sensor raw signals can be accessed for aid in troubleshooting sensor problems. Connect the instrument
to mPower Suite on a PC or the mobile App, check the “Enable Diagnostic” box in the Configuration
screen (“General” section), and send to the instrument. The main screen will show the sensor type, slot
position, raw sensor reading, and the gas concentration, for example:
Text
Type
Slot
Raw Reading
Concentration
Sensor Temp. (°C)
CO+3=9390, 0
CO
3
9390
0
29
O2+4=28505,20.9
O2
4
28505
20.9
32
VOC+1=18550,0.0
PID
1
18550
0
29
LEL+2=264400,0
LEL
2
264400
0
34
T=29,32,29,34,0
top down
The table below lists typical readings for new sensors.* For sensors not in this table, check the mPower
website www.mpowerinc.com for a Technical/Application Note on Diagnostic Mode.
•First check the Raw Zero readings in air. If these are significantly outside the ranges listed
below, there is probably something wrong with the sensor or circuit board.
•Apply calibration gas to the instrument. The readings should increase or decrease, depending
on sensor type, by at least the Delta values listed below. There is no set limit to the minimum
Delta change, but commonly if the Delta approaches the Minimum values listed, the sensor is
getting weak and it is likely time to replace it. A sensor may still be used if it provides adequate
resolution (for the application) on the lowest digit in normal display mode after proper
calibration.

POLI Service Manual
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Sensor Raw Counts
Sensor
Test Gas
Raw Air Zero*
Raw Span*
Minimum Delta*
Combustibles (pellistor) LEL
50% LEL CH4
170000-370000
177000-470000
7800
VOC 0-2000 ppm 4-series PID
10 ppm IBE**
100 ppm IBE
9600-44000
10000-49000
16000-92000
660
6600
Oxygen 0-30% lead wool O2
18% O2
0% O2
10000-45000
19000-53000
16000-65000
950
6900
Oxygen 0-30% lead-free O2
18% O2
0% O2
6000-20000
6100-22000
7200-32000
160
1200
Carbon Monoxide 0-1000 ppm CO
60 ppm CO
7300-12000
7500-14000
250
Hydrogen Sulfide up to 200 ppm H2S
15 ppm H2S
7300-12000
8000-18000
770
* Delta = Raw Span reading –Raw Air reading. These values are for reference only and are not to be
construed as hard specifications.
** IBE = Isobutylene
The Right Key can be used to scroll through other Diagnostic Mode screens with more information:
Battery Status
BatV: Fully charged should be close to 3.8V or slightly more, shut off below about 3.3V
AC Stat: 0 unplugged; >710 plugged in to charge adapter
Charge Stat: 0 unplugged; >720 plugged in to charge adapter
gSensor
These are position sensors used by the Man-Down alarm function. Values range from about -1000 to
+1000 depending on the orientation the unit is held in.
Amblite
The ambient light sensor is located in the upper left side alarm window of the POLI. The raw
ambient light readings should be about 3280 in complete darkness and near 0 in full sunlight.
Pump Info
This screen shows the pump speed setting, the pump current draw (with maximum and minimum
readings in parentheses) and the Pump Stall Threshold setting (see below for adjustment procedures).
The pump speed can be toggled between Low and High to check the values and settings for both.
Wireless
Two or more POLI instruments are needed to test the wireless communication function. This feature
appears for all POLI models but is only actually used in wireless models such as MP400S and
MP400H. Pushing “Ping” on one unit causes a single ring on a second unit if communication is
successful.

POLI Service Manual
7
Removing or Replacing Sensor Modules
WARNING!
Replace sensors only in non-hazardous locations.
All sensors are located inside the sensor compartment on the top side of the POLI circuit board
assembly. They are accessed by removing the six screws (2-mm or 5/64” Allen wrench or 3/32”
flathead screwdriver) in the back of the POLI and then turning the instrument over and lifting off the
front cover.
1. Turn off the instrument, remove the six screws from the back side, and lift off the front cover.
2. Carefully lift out each sensor you wish to inspect or replace.
3. Install the replacement sensor. Make sure the electrical contact pins are aligned with the holes in
the PC board and that the sensor is seated firmly. The location of sensors does not matter except as
noted below. High-power sensors have double winged housings and can only be placed in slots 1
and 2 with double-winged openings. Low-power sensors have single wings and can be inserted into
any of the four sensor slots.
4. The firmware automatically recognizes the sensor type at each location.
5. Reassemble, taking care that the sensor gaskets are set smoothly into the sensor caps.
IMPORTANT! Always perform a full calibration after cleaning or replacing sensors.
NOTE: Some PIDs versions interfere with O2Sensors. If an O2sensor gives spurious readings,
make sure to install it in a cross position from a PID, e.g., PID in slot 1, O2in slot 4, not slots 2 or 3.
CAUTION! Wireless MP400S Antennae Interfere with Lead-free O2Sensors in positions 2 and 4
and therefore LF-O2 sensors must be installed in position 1 or 3 in wireless units.
Single-Wing
Low-power
Sensor
Double-Wing
High-power
Sensor
Sensor Slot Identification
Sensor Gasket
in Cap

POLI Service Manual
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Cleaning or Changing PID Sensor Detector or Lamp
PID Lamp Cleaning
1. Pry off the PID sensor cover using a small flathead screwdriver.
2. Put on finger gloves and pull out lamp. Replace lamp or clean window as described below.
3. Use a cotton swab wetted with methanol or acetone to clean the flat window surface of the lamp. If
greasy dirt is hard to remove using solvent, the window can be polished using fine alumina powder.
4. Dry the lamp with clean tissue, re-insert into the PID sensor module and close the cover.
5. Some PID versions have a small, 3-pin sensor grid, and/or lamps with 2 conductive coatings on
opposite sides. In such cases, be sure to align the lamp coatings with the electrodes inside the lamp
socket (usually parallel to the 3 sensor grid sockets), to avoid possibility of a short-circuit. Insert
the lamp, then the sensor grid, and then the spacer, filter(s) and cap.
PID Sensor Detector Cleaning
1. Pry off the PID sensor cover and pull out the sensor detector.
2. Put the sensor detector into a beaker of pure methanol or ethanol.
3. Place the beaker into an ultrasonic cleaning bath (jewelry cleaner) and sonicate for 15 minutes.
Remove the sensor and dry it thoroughly. If possible, use a gentle stream of clean air to blow the
residual dust-containing liquid out of the sensor. Complete drying may take a few hours before
reassembly to ensure a stable PID baseline.
4. Always re-calibrate the PID after cleaning the sensor.
Metallic coating strips
3-Pin sensor grid
Alternate PID design
lamp alignment

POLI Service Manual
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Sampling Pump
The flow rate should be roughly 150-300 cc/min at low pump speed and 300-400 cc/min at high pump
speed when there is no air leakage. When approaching the end of its useful operating life, the pump
will consume more energy and draw significantly lower flow. Also, if excessive dust or particles enter
the pump, the flow will be reduced. A strong pump should stall and/or nearly stop when a finger is
used to block the inlet. If the pump does not stall and the flow is weak, it is likely that particles are
trapped in the pump gasket or diaphragm. When this occurs, it is necessary to replace or rebuild the
pump, or clean the gasket.
Pump Stall Setting
The Pump Stall setting defines the current draw threshold the detects a blocked pump. During normal
operation if the gas inlet becomes plugged, the pump automatically turns off to avoid further damage.
To adjust the stall threshold, enter the Pump Stall menu and press ‘Change’. When prompted, block the
inlet completely with a finger for 5 seconds and let go. During the blockage the pump should nearly
stall and the current (I) reading should increase to a high value. The Threshold will adjust itself
automatically. A partial blockage may cause only a small change in the current resulting in a poor stall
setting. If the new Threshold seems unsatisfactory for some reason, press ‘Clear’ and repeat the 5-
second blockage. When satisfied, press ‘Done’ followed by ‘Save’ to accept the new Pump Stall
Threshold.
NOTE: A different Pump Stall Threshold must be set for each pump speed. The instrument remembers
the corresponding thresholds so that the user does not need to re-set the threshold each time the pump
speed is changed.
NOTE: The current (I) value is relative and depends on the Pump Speed, the condition of the inlet
filter, and the firmware version. At high speed the I value is typically in the range 5000-5500 for
firmware 7.1 or later and 90-300 for earlier versions, while at low speed it is typically 6500-7500 for
v.7.1 or later and 400-900 for earlier versions. If the I readings are at the high end or above these
ranges, or if there is little or no change when the pump is blocked, some maintenance should be done.
Pump Service Procedures
1. Check for a dirty or plugged filter by removing the inlet 25-mm filter and re-measuring the
flow rate. Replace as needed.
2. Place a finger over the probe inlet and listen for a strain on the pump. It should nearly stop,
but may not stop completely. If the pump tone barely changes, check the flow path, such as the
inlet probe, inlet filter and/or Luer connector.
3. If the pump still gives low flow (or little strain when flow is blocked), clean the pump gasket as
described below:
Pump Stall
Current Pump
Thresh Setting:
I = 526
Thresh = 1235
Change
Done
Change
Clear
Done
Pump Stall
Please Block
Pump For 5 Sec:
I = 526
Thresh = 526
Block
Pump
Pump Stall
Please Block
Pump For 5 Sec:
I = 2350
Thresh = 1837
Clear
Done

POLI Service Manual
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Remove the 6 housing screws
(2-mm or 5/64” Allen wrench)
Remove the 2 screws holding down
the pump (Philips head)
Pull the pump up and out (there is strong
resistance and will need some rocking motion)
Remove the sensor gaskets and
unplug the power connector
Unscrew the pump casing (flat-
head) and slide the pump out
After pulling the pump fully
out, remove the inlet gasket
To clean the pump, loosen the
4 screws holding together the
pump (Phillips head)
Remove and separate the two pump gasket blocks. Wipe
clean the pump gasket. It may help to remove it (very
carefully to avoid damage) and clean both sides. In some
cases it helps to rotate it. If damaged or deformed, replace
the gasket. When reassembling, align pins with sockets.
New gaskets are flat on both sides,
but used ones develop groves
caused by the gasket sealing ridge.
If re-using a gasket place the
grooved side back facing the
sealing ridge
Alignment
pins
Alignment
socket
Gasket
Gasket
sealing
ridge
Use care if removing gasket

POLI Service Manual
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4. When re-assembling the components, ensure that
a. the pump base is inserted onto the guide/support post
b. the pump and circuit board are screwed down securely.
c. the gasket between the front and back housing fits snugly and forms a good seal, otherwise
the housing could leak and compromise intrinsic safety.
Gas Inlet
A damaged gas inlet piece is difficult to replace and requires a special tool. If this piece is damaged or
leaks, we strongly recommend either replacing the entire housing or returning the unit to mPower for
repair. If this repair is attempted, use retaining ring pliers as specified below and ensure that the ring is
locked in the slot of the gas inlet piece.
Original version (before Fall 2023):
In extreme cases it is necessary to
replace the pump diaphragm, or
simply replace the entire pump
Re-assemble in reverse order.
Push the sensor gaskets onto
the pump effluent hose barbs
During re-assembly, make sure
the sensor gaskets face correctly
Correct sensor
gasket placement
Incorrect sensor
gasket side –
need to flip over
Damaged inlet piece is
difficult to replace and
requires a special pliers.
Ensure that the ring is locked in the slot of the gas inlet
Retaining ring pliers, 90° tips, tip
diameter 0.038” (0.97 mm) for
rings up to 7/8” (2.2 cm) OD.

POLI Service Manual
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Sintered Filter version (beginning Fall 2023):
Housing Filters
Sampling in Diffusion instruments occurs through the filters on the front housing. If response is slow
or weak, or if the filters are discolored, replace them as follows:
1. Open the housing and remove the sensor gaskets as shown above for pump removal.
2. If desired, remove the pump (this step may become unnecessary with experience).
3. Using a flat-head screw-driver, lift up the white sensor caps and pry them off the support posts.
4. Insert new left and right sensor cap assemblies.
5. Reassemble, taking care to fit the sensor gaskets smoothly into the sensor caps.
Pry off the left and right sensor cap assemblies
Remove the sensor gaskets
Secure the inlet filter holder
using lock washer and
retaining ring pliers.as above
Place a sintered filter into the
inlet filter holder
Tighten as much
as possible
Twist on a Water
Trap Filter

POLI Service Manual
13
Battery Replacement
1. Replacing the battery requires removal of the circuit board and should be done by trained
technicians at an authorized service center.
2. Open the housing and remove the circuit board/sensor assembly from the back housing.
3. Remove all 4 sensors and pull off the clear plastic alarm window/brackets.
4. Unclip the two white clips on the back side of the circuit board to disconnect it from the white
plastic assembly.
5. Slide the LCD out of its bracket as shown below for LCD replacement. It is not necessary to
disconnect the LCD cable band.
6. Separate the LCD and white plastic assembly from the circuit board to expose the battery
7. Disconnect the battery plug, insert a replacement battery, and re-assemble.
8. Check that the LCD cable band is pulled taught to ensure that the pump makes good electrical
contact
Pull off the alarm
window/brackets
Remove all sensors
When removing the top/side alarm
window/brackets, take care not to
break the arrow-shaped clips on the
top alarm window/bracket. This is
best done using a twisting/peeling
motion, pulling out and slightly up.
During re-assembly, make sure that
these two brackets are connected to
each other using the arrow clips
Clips
Disconnect circuit board
from white plastic assembly
Slide LCD out of its
bracket (see below for
LCD replacement)
Disconnect battery plug
and connect replacement
battery, and reassemble

POLI Service Manual
14
LCD Replacement
1. LCD replacement requires removal of the circuit board and should be done by an authorized
service center.
2. Open the housing and disconnect the circuit board as described above for pump replacement.
Bend off the left retaining clip while
pulling out on the top left side of the
LCD, using a screw driver or fingernail.
Repeat for the right retaining clip.
From the bottom slide the LCD up
towards the sensor slots and out of
the bottom retaining clip.
On the bottom of the circuit board,
loosen the black retaining plugs that
secure the LCD cable band.
Using tweezers, carefully pull out the
LCD cable band and remove the LCD.
Push on the front of the LCD to remove it
from the casing. Insert the new LCD, plug in
the cable band, and reassemble the POLI.

POLI Service Manual
15
Troubleshooting
Problem
Possible Reasons & Solutions
Cannot turn on power after
charging the battery
Reasons: Defective USB cable or charging circuit. Defective
battery.
Solutions: Try charging battery again. Replace USB cable or
charger.
Cannot communicate with PC
Reason: Solution:
Wrong cable. Use mPower USB cable P/N M-011-3003-000.
After turn-on, large down
arrow is displayed and
keys do not function
Reason: Firmware corrupt.
Solution: Use mPower Suite to reload latest firmware. Multiple
attempts may be needed. If this fails, contact Service Center to use
Service Tool.
Lost password
Solutions: Call Technical Support at [phone]
Buzzer, LED lights, and
vibration motor inoperative
Reasons: Buzzer and/or other alarms disabled. Bad buzzer.
Solutions: Check under ‘Alarm Settings’ in Configuration Mode
that buzzer or other alarms are not turned off. Call authorized
service center.
Pump failed message
Pump alarm
Reasons: 1) Pump Speed setting changed or long extension hose
added. 2) Inlet probe blocked. 3) External filter plugged with dirt
or liquid. 4) Water condensed in the internal gas distribution lines.
5) Direct connection to calibration gas outlet before the regulator
is opened. 6) Bad pump or pump circuit.
Solutions: 1) Adjust Pump Stall threshold. 2) Remove blocking
materials and press [+/OK] key to reset the pump alarm. 3)
Replace the contaminated external filter. 4) Be careful not to allow
water condensation inside unit. 5) Start gas flow before
connecting. 6) Replace or rebuild the pump (by Service Center).
Inlet gas flow weak
Reasons: Flow path leaks. Pump diaphragm damaged or has
debris.
Solutions: Check flow path for leaks; such sensor module gasket,
inlet tubing and filter connections. Perform pump diaphragm
cleaning or replace pump.
“Lamp” alarm
Reasons: Lamp drive circuit. Weak or defective PID lamp.
Solutions: Turn unit off and back on. Replace lamp or whole PID
sensor.
Readings abnormally high or
low or noisy.
Reasons: Dirty or plugged filter or inlet. Dirty or old sensor.
Excessive moisture and water condensation. Incorrect calibration.
Solutions: Replace filter. Replace sensor or clean PID sensor.
Blow-dry flow path and/or PID sensor module. Calibrate unit.

POLI Service Manual
16
Replacement Parts
Description
Part Number
List Price*
Dummy sensor (4 pcs) (to fill empty slots)
M004-2034-004
$10.00
Inlet port cap (10 pcs ) (for diffusion models only)
M004-2028-010
$10.00
Alligator clip (10 pcs)
M490-0007-010
$30.00
PID Lamp cleaning and tool kit
M011-3008-000
$40.00
Calibration connector (Luer fitting and tubing - connects gas regulator to POLI)
M004-3008-000
$10.00
EU Charging adaptor, 100-240 V AC to 6V, 2A - 1 Port with attached MicroUSB cable
M004-3051-000
$50.00
US Charging adaptor, 100-240 V AC to 6V, 2A - 1 Port with attached MicroUSB cable
M004-3050-000
$40.00
USB Charging and communications cable
M011-3003-000
$25.00
Comm. Cable for POLI MonoDock, Down-angled 90° Micro USB to USB (1 pc)
M410-0017-001
$25.00
Comm. Cable for POLI MonoDock, Down-angled 90° Micro USB to USB (10 pcs)
M410-0017-010
$98.00
Water trap filters, double male/female Luer threaded for POLI (10 pcs)
M490-0005-010
$39.00
Water trap filters, double male/female Luer threaded for POLI (100 pcs)
M490-0005-100
$375.00
Sintered metal filters for inlet. (10 pcs)
M490-0153-010
$25.00
Housing filter replacement kit (10 pcs, 5 ea. left & right sensor cap assemblies)
M004-3052-000
$25.00
Poison-removing carbon filter for 4R LEL Pellistor sensor (1 pc)
M082-0903-000
$8.00
Poison-removing carbon filter for 4R LEL Pellistor sensor (pack of 10)
M082-0903-010
$79.00
Sensor gaskets (figure 8, connect to pump, pack of 10)
M004-2016-010
$35.00
Rubber protector plug for POLI micro USB port (pack of 10, with 10 screws)
M004-2025-010
$50.00
LCD Display for POLI MP400 & NEO MP18X Series (raw LCD, 10 pcs)
M011-3023-000-SRP
$150.00
LCD Display for POLI MP400 & NEO MP18X Series (raw LCD, 1 pcs)
M011-3023-001-SRP
$30.00
Battery pack for POLI MP400 Series
M004-3002-000
$100.00
Pump module for POLI MP400 Series
M004-3010-000
$300.00
Pump rebuild kit (3 oval gaskets and 1 piston diaphragm)
M011-3022-000-SRP
$25.00
Pump Gasket
M004-2048-010
$15.00
Main Board Support
M004-2019-010
$30.00
Main PC board assembly with firmware, for MP400 & MP400P, CSA (must provide the
SN of original POLI, so mPower can set the product model and SN)
M004-1013-000-SRP
$260.00
Main PC board assembly with firmware & 915MHz wireless modem, for MP400S &
MP400H, CSA (must provide the SN of original POLI, so mPower can set the product
model and SN) (does not incl. antenna, because MP400H & MP400S antennae differ)
M004-1013-100-SRP
$360.00
Housing cover assembly (no base) for POLI pump versions (pump included) tr85→105
M004-3001-000-SRP
$360.00
Housing base & cover assembly for POLI pump versions (pump not included)tr18→38
M004-3001-100-SRP
$118.00
POLI Sinter Filter Inlet Installation Kit (to retrofit old version front housing) tr $6
M004-3056-000-SRP
$30.00
Housing base & cover assembly for POLI diffusion versions
M004-3005-000-SRP
$98.00
Housing base & cover assembly for POLI MP400H/HS
M004-3001-200-SRP
$98.00
Housing base assembly for POLI MP400 series
M004-2004-100-SRP
$50.00
POLI Inlet (female Luer connection) and retaining ring (pack of 5 sets)
M004-3055-000-SRP
$40.00
Antenna for POLI MP400S, FPC, 915MHz
M550-0019-000
$20.00
Antenna for POLI MP400H/HS and mLinkP (rubber), SMA Female, 915Mhz
M550-0020-000
$20.00
* These prices are for reference and may change at any time. Please refer to the latest version of the mPower
List Price Guide or contact mPower for a quotation.
Main Board Support
Pump gasket
Inlet w/Luer
Sensor gasket
POLI MonoDock
Comm Cable

POLI Service Manual
17
Contact Information
mPower Electronics Inc.
2910 Scott Blvd. Santa Clara, CA 95054 USA
Phone: [phone]
Toll Free: (866) mPower7 [phone]
Fax: [phone]
[email protected]
www.mpowerinc.com
Main Board M004-1013-000-SRP w/o modem
Main Board M004-1013-100-SRP w/ modem