WatchGas NEO MP181 User manual

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NEO Photo-ionization Detector
User Manual
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Detection NEO Photo-ionization detector User Manual
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Contents
Contents 2
Description 3
Warning 3
Caution 3
1 Product Overview 4
2 Display 4
3 Charging a Lithium-ion Battery 5
3.1 Low Voltage Warning 5
3.2 Clock Battery 6
3.3 Data Protection While Power is O 6
4 Instrument Operation 6
5 Basic User Mode 6
5.1 Turning The Instrument On 6
5.2 Turning The Instrument O 7
5.3 User Mode Summary 7
5.4 Integrated Sampling Pump 7
5.4.1 Pump Status 8
5.5 External Water-trap Filters 8
5.6 Alarm Signals 8
5.6.1 Alarm Signal Summary 8
5.6.2 Preset Alarm Limits & Calibration 8
5.6,3 Testing the alarms 9
5.7 Backlight 9
5.8 Datalogging 9
5.9 Man Down 9
5.10 Wireless 9
6 Conguration Mode 10
6.1 Navigating Cong Mode 10
6.1.1 Selection From a List 10
6.1.2 Entering Numerical Values 10
6.2 Entering en exiting conguration mode 11
6.3 Conguration Mode Menus 11
6.3.1 Calibration 13
6.3.2 Measurement 15
6.3.3 Alarm Setting 16
6.3.4 Datalog 18
6.3.5 Monitor (MNT) Setup 18
7 Computer Interface Using mPower Suite 11
7.1 Connecting And Conguring 22
7.2 Datalog Reviel 23
8 Maintanance 24
8.1 Lamp Cleaning Or Changing 24
8.2 Sensor Cleaning 24
9 Troubleshooting 25
10 Specications 26
11 Limited Warranty 27

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Description
The NEO is one of the most advanced handheld VOC (Volatile Organic Compound) monitors available
for ppb (parts per billion) detection. The NEO oers several models from the most sensitive 1 ppb
to a high range up to 15000 ppm for dierent applications and user selections. Novel designs of the
photo-ionization detector (PID) and ultraviolet (UV) lamp provide outstanding sensitivity, stability
and reproducibility. Options include real time data monitoring with a built-in wireless modem using
mPower Suite application software.
Warning
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, main-
tained, and serviced in accordance with the manufacturer’s instructions. The user should understand
how to set the correct parameters and interpret the obtained results.
• Use only WatchGas mPower battery pack M011-3002-000. Substitution of components may impair
intrinsic safety. Recharge batteries only in non-hazardous locations.
• Do not mix old and new batteries or batteries from dierent manufacturers.
• For maximum safety, the accuracy of the instrument should be checked by exposing it to a known
concentration calibration gas before each day’s use.
• Do not use USB/PC communication in a hazardous location.
• Static Hazard: Clean only with a damp cloth.
• For safety reasons, this equipment must be operated and serviced by qualied personnel only.
Read and understand the instruction manual completely before operating or servicing.
Caution
• To reduce the risk of electric shock, turn the power o before removing the instrument cover.
Disconnect the battery before removing sensor module for service. Never operate the instrument
when the cover is removed. Remove instrument cover and sensor module only in an area known to
be non-hazardous.

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2. Display
The LCD display provides visual feedback that includes the reading, pump, Man Down, time, battery
condition, and other functions. The display shows the following information:
1. Product Overview
The instrument’s user interface consists of the
LCD display, Alarm LEDs, an alarm transducer,
and four keys. The keys are:
Esc
Ent
OK
Esc
Ent
OK
EscEnt
OK
EscEnt
OK
Left key
Right Key
Up Key
Down/Mode Key
INLET FILTER
LCD DISPLAY
GAS OUTLET
UP KEY
LCD DISPLAY
SENSOR CAP
ALARM LEDS
RIGHT KEY
MOVE CURSOR
BUZZER
MAN DOWN
STATUS
PUMP STATUS
CALIBRATION/
BUMP DUE
BATTERY STATUS
DATALOG STATUS
REDING AND
CONCENTRATION UNIT
LAMP STATUS
TIME
GAS NAME AN D
CORRECTION FACTOR
TEMPERATURE
LCD DISPLAY

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3.Charging a Lithium-Ion Battery
Always fully charge the battery before using the instrument. The screen will display a battery icon from
empty (no bars) to fully charged (3 bars). Follow this procedure to charge the instrument:
1. Plug the Micro-USB into the charging port at the bottom of the instrument.
2. Plug the USB connector* into either a) a personal computer, or b) into the AC/DC adapter and plug
the AC/DC adapter into the wall outlet.
The instrument begins charging automatically. The charging LED turns red to indicate charging.
During charging, the 3 bars in the battery icon on the instrument’s display are animated. When
the battery is fully charged, the LED turns green, the icon is no longer animated and shows a full
battery, and the message ‘Fully Charged’is displayed.
*NOTE: Any locally-obtained USB A to Micro B USB cable will work for charging, but will not work for
communication with mPower Suite conguration and data transfer software. The WatchGas mPower
USB cable P/N M-011-3003-000 is required for a PC to recognize the instrument and communicate
with mPower Suite.
Item Description
Gas information Shows the measurement gas and its correction factor
Reading Concentration of gas measured by the instrument
Calibration/Bump Due Indicates if calibration or bump status is OK or not
Pump Status Indicates whether the pump is working or blocked
Man Down Status Indicates if Man Down alarm is on
Lamp Status Indicates if the lamp is on or not
Datalog Status Indicates whether datalog is on or o
Battery Status Indicates battery capacity in 3 bars
Time Indicates current time
Temperature Indicates current temperature
Warning
To reduce the risk of ignition of hazardous atmospheres, recharge and replace batteries only
in areas known to be non-hazardous. Use only WatchGas mPower’s rechargeable lithium
battery part number: M011-3002-000.
3.1 LOW VOLTAGE WARNING
When the battery’s charge falls below a preset voltage, the instrument warns you by beeping
once and ashing once every minute, and the“empty battery” icon blinks on and o once per
second. Turn o the instrument within 10 minutes and either recharge the battery, or replace the
battery with a fresh one with a full charge.

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3.2 CLOCK BATTERY
An internal clock battery is mounted on one of the instrument’s printed circuit boards. This long-life
battery keeps settings in memory from being lost whenever the Li-ion battery or alkaline batteries
are removed. This backup battery should last approximately ve years, and must be replaced by an
authorized mPower service technician. It is not user-replaceable.
3.3 DATA PROTECTION WHILE POWER IS OFF
When the instrument is turned o, all the current real-time data including last measured values are
erased. However, the logged data are preserved in non-volatile memory, so that even if the battery is
disconnected, the logged data will not be lost.
4. Instrument Operation
The NEO gives real-time measurements and activates alarm signals whenever the readings exceeds
preset limits. Prior to factory shipment, the instrument is preset with default alarm limits and the
sensor is pre-calibrated with standard calibration gas. However, the instrument should be tested and
the calibration veried before the rst use. After the instrument is fully charged and calibrated, it is
ready for immediate operation.
The instrument works in dierent operation modes dened by the product model and factory setting.
When the unit is turned on, it enters User Mode, where basic users can only see and use a limited set
of functions. In Conguration Mode, which is password protected, advanced users can adjust various
settings. In some cases, Conguration Mode is not accessible on the instrument display and the
mPower Suite software must be used to change settings.
5. Basic User Mode
5.1 TURNING THE INSTRUMENT ON
Press and hold the Mode key
EscEnt
OK
until the display, beep buzzer & LEDs turn on, and then release.
If the mPower logo does not appear rst, there is likely a problem and Watchgas Technical Support
should be contacted. The instrument then performs self-tests after the screen displays the rmware
version and serial number.
Self-tests include:

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5.2 TURNING THE INSTRUMENT OFF
Press and hold the Mode key
EscEnt
OK
for 3 seconds, and continue to hold for a 5-second countdown until
“Unit o...”is displayed.
5.3 USER MODE SUMMARY
The instrument will be running in basic User Mode after being turned on. It will show the real-time
reading and auxillary information.
Press the Up key
EscEnt
OK or Mode Key
EscEnt
OK
to cycle through the main menu screens. If no action us taken
on any screen for 60 seconds, the display will return to the main menu automatically.
After self-tests, the instrument will show sensor information and instrument conguration information
in sequence. Once the startup procedure is complete, and a numerical reading screen with icons is
displayed, the instrument is fully functional and ready for use.
FLOW CHART FOR BASIC USER MODE
5.4 INTEGRATED SAMPLING PUMP
The instrument includes an integrated, diaphragm-type sampling pump, providing ow rates of
330 to 450 cc/min. adjustable in three speed settings. When used with a 25 mm diameter 0.45 µm
lters the ow rate is about 250 to 360 cc/min. at low and high settings. Flow will decrease if the
lter accumulates particulate matter, or if a lter is not used and particles get caught in the pump
diaphragm. Connecting Teon tubing with 1/8” inside diameter to the gas inlet port, this pump can
pull air samples from 200’(61 m) away horizontally, or 90’ (27.5 m) vertically, at about 3’(0.9 m) per
second ow rate. Note that at 200’the PID response will be delayed by about 1 minute, the time
required for the gas sample to reach the instrument.

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Caution
During operation, make sure the probe inlet and the gas outlet are free of obstructions.
Obstructions can cause premature wear on the pump, false readings, or pump stalling.
5.4.1 PUMP STATUS
During normal operation, the pump icon alternately shows inow and outow. If there
is a pump failure or obstruction, the alarm sounds and the pump stall icon blinks on and
o. If this occurs, clear the obstruction and press the Right key to restart the pump.
5.5 EXTERNAL WATERTRAP FILTERS
The external lter is made of a PTFE (Teon) or PVDF membrane with 0.45 micron pore size to
prevent dust or other particles from being sucked into the sensor manifold, which could damage the
instrument. It prolongs the operating life of the sensor and pump. To install the external lter, simply
screw it in to the instrument’s inlet probe using the Luer connection.
5.6 ALARM SIGNALS
During each measurement period, the gas concentration is compared with the programmed alarm
limits (gas concentration alarm limit settings). If the concentration exceeds any of the preset limits,
the loud buzzer and red ashing LED are activated immediately to warn of the alarm condition. In
addition, the instrument alarms if one of the following conditions occurs: battery voltage falls below a
preset voltage level, failure of the UV lamp, or pump stall.
Message Condition Alarm Signal
HIGH Gas exceeds‘High Alarm’ limit 3 beeps/ashes per second
OVR Gas exceeds measurement range 3 beeps/ashes per second
MAX Gas exceeds electronics’ maximum range 3 beeps/ashes per second
LOW Gas exceeds‘Low Alarm’ limit 2 beeps/ashes per second
TWA Gas exceeds‘TWA’limit 1 beep/ash per second
STEL Gas exceeds‘STEL’limit 1 beep/ash per second
Pump icon ashes Pump failure 3 beeps/ashes per second
Lamp PID lamp failure 3 beeps/ashes per second plus‘Lamp’
message
Battery icon ashes Low battery 1 ash, 1 beep per minute plus battery icon
ashes
CAL Calibration failed, or is overdue 1 beep/ash per second
NEG Gas reading measures less than number
stored in calibration
1 beep/ash per second
Cal Gas Cal Span Unit Low High TWA STEL
Isobutylene 10 ppm 50 100 10 25
5.6.1 ALARM SIGNAL SUMMARY
5.6.2 PRESET ALARM LIMITS & CALIBRATION
The instrument is factory calibrated with standard calibration gas, and is programmed with default
alarm limits. For example, on the NEO PPM, the default values are:

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Alarm limits and calibration parameters can be adjusted in Conguration Mode as desired for
particular testing purposes and applications.
5.6.3 TESTING THE ALARMS
The alarm can be tested whenever the main (Reading) display is shown. Press the Right key, and the
audible and visible alarms are tested.
5.7 BACKLIGHT
The LCD display is equipped with an LED backlight to assist in reading the display under poor lighting
conditions. Background lights can be turned on automatically under poor light condition and be set
in a variety of ways. We can choose from the settings menu under Cong Mode or through WatchGas
mPower Suite.
5.8 DATALOGGING
During datalogging, the instrument displays a disk icon to indicate that datalogging is enabled. The
default status is to have datalogging on, at 60-second intervals, which allows up to one year of data
storage. The instrument stores the measured gas concentration at the end of every sample interval
(when datalogging is enabled). In addition, the following information is stored: user ID, site ID, serial
number, last calibration date, and alarm limits. All data are retained (even after the unit is turned o) in
non-volatile memory so that it can be down- loaded at a later time to a PC. Stored data are organized
into‘events’, with a new event created each time the instrument is turned on, or a conguration
parameter is changed, or datalogging is interrupted. After an event is recorded, the unit records a
shorter form of the data. When transferred to a PC running mPower Suite, these data are arranged with
a sample number, time, date, gas concentration.
5.9 MAN DOWN
Settings are available for On/O depending on the user’s requirement.
The Man Down Alarm is a critical and potentially lifesaving safety feature of the NEO. Its function is
based on the premise that if the instrument is motionless when it is not supposed to be, something
wrong may be happening to its user. If that is the case, the NEO not only goes into alarm locally on
the instrument, but also remotely, over a wireless network, to notify people in the vicinity, as well as
remote safety ocers at a command center, that a person is down, so that help can be dispatched
quickly.
Note: Remote notication requires wireless connection to a network.
5.10 WIRELESS
When NEO is equipped with wireless capability, it is set up through the wireless sub-menu.

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6. Conguration Mode
The Cong Mode is used to modify the instrument conguration settings.
• Press the Up key
EscEnt
OK or Mode key
EscEnt
OK
to scroll through the list.
• Press the Right key
Esc
Ent
OK
to select the menu item.
• Press the Left key Esc
Ent
OK
to select the menu item.
6.1.2 ENTERING NUMERICAL VALUES
For example, to enter a numerical password:
• Increase or decrease the number from 0 through 9 by pressing the
Up key
EscEnt
OK or Mode key
EscEnt
OK
.
• Press the Right key
Esc
Ent
OK
or the Left key Esc
Ent
OK
to move the cursor.
• After entering the desired numbers, press the Right key
Esc
Ent
OK
or the Left key Esc
Ent
OK
to move th cursor
to
the‘√ ‘ mark, and then press the Up key
EscEnt
OK to accept and move to the next menu.
6.1 NAVIGATING CONFIG MODE
There are two types of menus in Cong mode: 1) those that ask for selection from a list and 2) those
that ask for a numerical value to be entered.
6.1.1 SELECTION FROM A LIST
For example, the Measurement sub-menu contains both a text-format list and a radial-button list.
EscEnt
OK
EscEnt
OK
EscEnt
OK
EscEnt
OK
Esc
Ent
OK
Esc
Ent
OK

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6.2 ENTERING EN EXITING CONFIGURATION MODE
From the main reading display, press and hold the Up key
EscEnt
OK and Mode
key
EscEnt
OK
simultaneously until the Password screen is shown. Input the
4-digit password, move the cursor to‘√’, then press the Up key
EscEnt
OK to enter
Conguration Mode.
Note: The default password is 0000. The password can only be changed by
connecting the instrument to a PC running mPower Suite software.
Upon successfully entering Cong Mode, the screen on the right will be
displayed. The Calibration label is shown and its icon is highlighted. Use
the Up key
EscEnt
OK or Mode key
EscEnt
OK
to scroll through the menu until the
desired item is reached, and use the Right key to select it.
To Exit Cong Mode and return to normal operation, press the Left key
repeatedly from any of the Cong Menu displays.
6.3 CONFIGURATION MODE MENUS
This table summarizes the Cong Mode menus and sub-menus. Not all of these menus will be displayed
if the option is not set up using mPower Suite software
Calibration Measurement Alarm Setting Datalog Monitor Setup Wireless
Zero Calibration Measurement Unit Alarm Limits Clear Datalog Date & Time Radio On/O
Span Calibration Measurement Gas Alarm Mode Interval Display
Set Cal. Gas Alarm Settings Pump Speed
Set Span Value Comfort Beep Set Pump Stall
Set Span 2 Value Man-Down Alarm 3-point Calibration
Rolling Graph
Real time data
Language
Self-Zeroing

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FLOW CHART FOR FOR CONFIGURATION MODE

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6.3.1 CALIBRATION
Calibration Overview
Although the instrument will typically hold an approximate calibration for
several weeks, when used for worker health and safety it should be calibrated or
bump tested before each day’s use. The interval between span calibrations can
be extended based on the user’s experience for how long the calibration holds
under their operating conditions. For best accuracy the calibration gas chosen
is the same as the gas to be measured. However, this is often inconvenient, and
isobutylene has become the standard surrogate calibration gas because it has
good response and is inexpensive, stable, and non-toxic. A correction factor (CF)
can then be applied to make the NEO display in true concentration units of the
gas being measured. This CF is selected from the instrument’s gas library of over
200 compounds, or entered manually.
Calibration Set-Up
Span gas from a cylinder is conveniently supplied to the instrument using a regulator with xed ow
rate of about 0.5L/min (500 cc per min.) to match or slightly exceed the ow rate of the instrument
pump. Alternatively, the span gas can rst be lled into a gas bag (e.g., Tedlar® bag) or delivered through
a demand-ow regulator to match the pump ow precisely. Another alternative is to use a regulator
with >500 cc/min ow but allow the excess ow to escape through a T connector or an open tube.
Zero Calibration
This procedure determines the zero point of the sensor calibration curve. Connect the instrument to a
clean air source free of VOCs such as from a cylinder, gas bag, or ambient air ltered through a charcoal
tube (VOC Zeroing Tube). Most outdoor air is suciently free of contaminants that it can be used for
zero calibration except for measurements in the low ppb range. The air source should have an oxygen
concentration of 20.9% (or the same as in the gas to be measured) because oxygen levels have some
eect on the PID response.
Select ‘Zero Calib’by pressing the Right key to enter the submenu. The message‘ Please Apply Zero Gas’
is displayed. Start the zero calibration by pressing the Up key, and a 30- second countdown begins.
Note: To abort the zeroing and proceed to Span calibration, press the Left key at any time during the
process. A conrmation message‘Zero aborted!’will appear, followed by the Span calibration menu.
When complete, this message“Zero Calibration Done!”is shown, and the display automatically moves to
the Span Calibration menu.

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Span Calibration
This procedure determines the second (and third, if 3-Point Cal is selected in Monitor Setup) point(s)
of the sensor calibration curve. One or two cylinders of standard reference gas (span gas) tted with
a 500 cc/min ow-limiting regulator or a ow-matching regulator is the simplest way to perform this
procedure. The span gas concentration should be chosen to be near the highest concentration of actual
measurements expected. It is also preferred to use the same balance gas (e.g., air or nitrogen) as occurs in
the actual measurements.
To perform a Span calibration, connect the calibration adapter to the inlet port of the instrument, and
connect the tubing to the regulator or gas bag. Select‘Span Calib’by pressing the Right key to enter the
submenu. The message‘Please Apply Gas’is displayed. Start the span calibration by pressing the Up key,
which begins a 30- second countdown.
Note: To abort the Span calibration, press the Left key at any time during the process. The conrmation
message‘Span is aborted!’appears followed by the next menu item.
When Span 1 calibration is complete, a message similar to this is displayed (the
value is an example only):
3-Point Calibration
If‘3-Point Cal.’is enabled (see Monitor Setup), proceed to perform Span 2 in the same manner as for Span
1.
3-Point calibration should be used whenever enhanced accuracy is required. It is especially
recommended for measurements above about 500 ppm, where PID response is not quite as linear.
Set Calibration Gas
In the Set Cal. Gas menu, select the calibration gas from either the mPower Gas Library or the user’s
Custom Gases list. Custom Gas names and parameters can only be set up through the mPower Suite
software.
Span 1 is done!
Reading = 10.ppm

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Press the Right key to select Gas Library, or Custom Gases. Press the Up key or Mode key to scroll through
the gas list. For high-speed scrolling, press and hold the Up key until the desired gas name is reached.
Press the Right key to select the gas and the Left key to save and exit.
Set Span Value
Span value settings (including Span 2) should match the concentration(s) of standard gas. Check
to ensure that the unit of concentration (e.g., ppm or mg/m3) on the gas cylinder agrees with the
instrument setting.
6.3.2 MEASUREMENT
The sub-menus for Measurement are Measurement Unit and Measurement Gas.
Measurement Unit
Standard available measurement units include:
Measurement Gas
Measurement gases are organized in two lists:
1. Gas Library is a pre-set list that contains a few hundred chemicalsdetectable
by PID.
2. Custom Gases are user-dened, using mPower Suite to set up all
gasparameters, including the name, span value(s), correction factor(s), and
default alarm limits.
Press the Right key to select Gas Library, or Custom Gases. Press the Up key or Mode key to scroll through
the gas list. For high-speed scrolling, press and hold the Up key until the desired gas name is reached.
Press the Right key to select the gas and the Left key to save and exit.

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6.3.3 ALARM SETTING
During each measurement period, the gas concentration is compared with
the programmed alarm limits (Low, High, TWA and STEL). If the concentration
exceeds any of the preset limits, the loud buzzer and red ashing LED are
activated immediately to warn of the alarm condition. Press the Right key to enter
the Alarm Setting menu.
Alarm Limits
In this menu, the High, Low, STEL, and the
TWA alarm limits can be changed. Press the
Right key to enter the Alarm Limits menu.
High Alarm
The default High Alarm limit is set by the instrument to match the
value for the current measurement gas. To change the High Alarm
limit press the Up or Mode key to increase or decrease each digit’s
value, and the Right or Left key to move the cursor. Move the cursor
to‘√’after the setting is complete, and press Up to save and exit.
Low, STEL and TWA Alarms
Set the Low, STEL and TWA Alarm limits in the same manner as described above for the High Alarm limit.
Note: All default alarm limits depend on the measurement gas and are expressed in ppm.
Alarm Mode
There are two selectable alarm modes:
1. Latched
When the alarm is triggered, it stays on even when the concentration falls back below the alarm limit.
The alarm must be stopped manually by pressing the Right key. The latched setting only controls
High, Low, STEL, and TWA alarms.
2. Automatic Reset
When the alarm condition is no longer present, the alarm stops automatically.
Alarm settings
The buzzer and light alarms can be programmed to be on or o individually or in combination. The
choices are:
• Both on
• Light only
• Buzzer only
• Both o
Press the Up or Mode key to step from one option to the next. Then press Right to make a selection
followed by Left to save and exit.

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Comfort Beep
The buzzer and light alarms can be programmed to be on or o individually or in combination.
The choices are:
• Both on
• Light only
• Buzzer only
• Both o
Press the Up or Mode key to step from one option to the next. Then press Right to make a
selection followed by Left to save and exit.
Man-Down Alarm
The Man-Down alarm noties nearby personnel if the instrument remains motionless for some time
when it should be moving, indicating a possible worker in distress. In addition, if the wireless option is
enabled, alarm notication is sent to a remote location. Press the Right key to enter Man down alarm
menu.
Man-Down Alarm O/On
Press Right to make a selection followed by Left to save and exit.
Motionless Time
Motionless Time is the trigger time for Man-Down alarm when the
person is motionless. The default motionless time is 30s. To change the
time press the Up or Mode key to increase or decrease each digit’s
value, and the Right or Left key to move the cursor. Move the cursor to
‘√’after the setting is complete, and press Up to save and exit.
Sensitivity
This sensitivity of motion sensor can be set to Low, Medium or High.
High sensitivity means that small movements are enough to prevent a
Man-Down alarm. Use Up or Mode to move up or down the list, Right
to select, and Left to save and exit.
Warning Time
The Warning Time is the amount of time the Man-Down alarm stays on
after it is triggered. The default time is 30s. Adjust as for Motionless Time.

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6.3.4 DATALOG
The instrument automatically stores the concentration readings at regular time
intervals (this function cannot be turned o). In the datalog sub-menu, a user can
adjust the interval or clear all data. Press Right to enter the Datalog menu.
Clear Datalog
This erases all the data stored in the datalog.
CAUTION: Once the data are cleared, they cannot be recovered.
6.3.5 MONITOR MNT SETUP
Several settings can be accessed here, including date and time, pump parameters, display parameters
and selecting 3-point calibration.
Date and time
This erases all the data stored in the datalog.
CAUTION: Once the data are cleared, they cannot be recovered.
1. Press the Right key to clear the datalog. The display asks,‘Clear Datalog?’
2. Press the Left key if you do not want to clear the datalog.
3. Press the Up key if you want to clear the datalog. When it has been cleared, the display shows‘Datalog
Cleared!’and moves to the next sub-menu, Interval.
Interval
Intervals are shown in seconds. The default value is 60 seconds and the
maximum is 3600 seconds (1 hour). There is enough data capacity to run for
6 days at 1-second intervals, 12 months at 60-second intervals, or 6 years at
10-minute intervals. Once the datalog is full, it cycles and begins to replace
the oldest data.
To change the Datalog Interval, press the Up or Mode key to increase or decrease each digit’s value, and
the Right or Left key to move the cursor. Then move the cursor to‘√’ and press Up to save and exit.

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Detection
User Manual Photo-ionization detector NEO
D e t e c t i on
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Date
The date is expressed as Month/Day/Year, with two digits for each. To change
the date press the Up or Mode key to increase or decrease each digit’s value, and
the Right or Left key to move the cursor. Move the cursor to‘√’ after the setting is
complete, and press Up to save and exit.
Time
The Time is expressed as Hours/Minutes/Seconds, with two digits for each. The
time is in 24-hour (military) format. Adjust the time in the same manner as for the
date.
Display
The Display function is used to set LCD contrast and backlight.
LCD Contrast
The default LCD Contrast is about 50%.
To change the contrast, press the Up or Mode key to increase or decrease the digit’s value, then move the
cursor to‘√’and press Up to save and exit.
Backlight
The Backlight can be set as Automatic, Manual or O. In Automatic Mode the backlight comes on and
stays on in low light conditions. In Manual Mode, pressing the Right or Left key turns the backlight on for
one minute.
Pump Speed
The pump can operate at three speeds, low, medium and high, ranging from about 250 to 350cc/min
with a standard 0.45 μm lter in place, or about 350 to 450 cc/min with the lter removed. Running at
low speed is quieter and conserves a small amount of power. There is almost no dierence in sampling
accuracy. High pump speed is recommended for faster response when using an extension hose to
sample, or when measuring heavy compounds, which tend to have slow response because of adsorption
on inlet surfaces.
Use the Right key to enter Pump Speed, then Up or Mode to scroll on the list, Right to select, and Left to
save and exit. Note that each Pump Speed has its own Stall Threshold.

Detection NEO Photo-ionization detector User Manual
D e t e c t i on
20
Set Pump Stall Threshold
The Pump Stall Threshold is the current-draw setting for a blocked pump alarm.
The default setting is 500. The actual, real-time pump current draw is displayed in
the upper right corner. Briey block the inlet probe with a nger and to observe
the rise in pump current value. Set the stall threshold about 50-100 units above
the unblocked pump reading, but lower than the blocked pump reading. Press
the Up or Mode key to increase or decrease each digit’s value, and the Right or
Left key to move the cursor. Then move the cursor to‘√’ and press Up to save and
exit. Set a dierent pump stall threshold for each pump speed.
3-Point Calibration
Normally a 2-point calibration gives adequate linearity in PID response, but a
3-point calibration (Zero, Span 1 and Span 2) can be enabled for more accuracy,
particularly in the high concentration range above about 500 ppm where
response is less linear. Use the Right key to enter 3-Point Cal, then Up or Mode to
scroll to On or O, Right to select, and Left to save and exit.
Below is the list of default 1st and 2nd Span points when using isobutylene for calibration. These settings
can be changed in the Calibration menu.
Rolling Graph
If the Rolling Graph function is enabled, the display in basic User Mode shows the instantaneous
reading together with a real-time plot of immediate past readings in a 2-minute window. Enable
the rolling graph as with any other list selection menu.
Real Time Data
Real time data output is available on some NEO models via a USB cable and/ or wirelessly via Bluetooth
Low Energy using an Android App. Please contact WatchGas for more information.
NEO Model Span 1 Span 2
MP181 100 ppm 1000 ppm
MP182 100 ppm 5000 ppm
MP184 10 ppm 1000 ppm
MP185 10 ppm 1000 ppm
MP186 5 ppm (benzene) N/A