AQM 65 User Guide
Aeroqual AQM60 User Guide
Contents
User Guide Revision History ................................................................................................................... 5
1.
Description....................................................................................................................................... 6
1.1.
External Connections................................................................................................................. 7
1.2.
Gas Modules .............................................................................................................................. 7
1.2.1.
Gas Sensor Specifications .................................................................................................. 8
1.3.
Thermal Management System .................................................................................................. 8
1.4.
Sensirion SHT75 Temperature and Humidity Sensor ............................................................... 9
1.5.
Auxiliary Module (Optional) ....................................................................................................... 9
1.6.
Particle Monitor ........................................................................................................................ 11
1.6.1.
Nephelometer .................................................................................................................... 11
1.6.2.
Inlet heater ........................................................................................................................ 11
1.6.3.
Inbuilt filters ....................................................................................................................... 11
1.7.
Profiler ..................................................................................................................................... 12
1.7.1.
Optical Particle Counter .................................................................................................... 12
1.7.2.
Connections ...................................................................................................................... 12
1.7.3.
Data Outputs ..................................................................................................................... 12
1.8.
Particle Mass Pump Modules .................................................................................................. 13
1.8.1.
Profiler Pump Module ........................................................................................................ 13
1.8.2.
Nephelometer Pump Module ............................................................................................ 13
1.9.
Electrical Connections ............................................................................................................. 14
1.10. Pneumatic Connections ........................................................................................................... 15
2.
Set Up .............................................................................................................................................16
2.1.
Unpacking ................................................................................................................................ 16
2.2.
Assembly ................................................................................................................................. 16
2.2.1.
Connect Mains Power ....................................................................................................... 16
2.2.2.
Connect Inlet System ........................................................................................................ 18
2.2.3.
Assembly of heated inlet for PM/Profiler (Optional) .......................................................... 18
2.2.4.
Connect third party sensors (Optional) ............................................................................. 19
2.3.
Connect to the AQM 65 ........................................................................................................... 19
2.3.1.
Initial Connection via Access Point Mode ......................................................................... 20
2.4.
Initial Commissioning ............................................................................................................... 21
2.4.1.
System Checks ................................................................................................................. 21
2.4.2.
System Values .................................................................................................................. 22
2.4.3.
Zero and Span Checks for Gas Modules .......................................................................... 22
3.
Connecting to Aeroqual Connect and Cloud .............................................................................22
3.1.
Connection Options ................................................................................................................. 22
3.1.1.
Client Mode ....................................................................................................................... 22
3.1.2.
Cellular Network Connection............................................................................................. 23
3.2.
Aeroqual Cloud ........................................................................................................................ 25
3.2.1.
Manual Sync ..................................................................................................................... 26
3.3.
Connection Scenarios.............................................................................................................. 26
4.
Using Aeroqual Connect and Cloud ...........................................................................................27
4.1.
Journal ..................................................................................................................................... 27
4.2.
Manage Data ........................................................................................................................... 28
4.2.1.
Charts ................................................................................................................................ 28
4.2.2.
Table ................................................................................................................................. 29
4.2.3.
Download Data .................................................................................................................. 29
4.2.4.
Auto Export (Only Available in Aeroqual Cloud) ............................................................... 29
4.3.
Calibration and Service ........................................................................................................... 30
4.3.1.
Gain and Offset ................................................................................................................. 30
4.3.2.
AirCal 8000 ........................................................................................................................... 30
4.4.
Diagnostics and Advanced ...................................................................................................... 31
4.4.1.
Diagnostics ........................................................................................................................ 32
4.4.2.
Module Settings ................................................................................................................ 32
4.5.
Configure Instrument ............................................................................................................... 32
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Aeroqual AQM 65 User Guide
4.5.1.
4.5.2.
4.5.3.
4.5.4.
4.5.5.
4.5.6.
Settings ............................................................................................................................. 32
Configuring the System ..................................................................................................... 33
Configuring the Sensors .................................................................................................... 33
Alerts (Only Available in Aeroqual Cloud) ......................................................................... 34
Sensor List ........................................................................................................................ 34
Data filters ......................................................................................................................... 34
5.
Gas Module Calibration ................................................................................................................35
5.1.
Introduction .............................................................................................................................. 35
5.2.
Calibration Gas Humidity ......................................................................................................... 35
6.
Calibration setup ...........................................................................................................................36
6.1.
Zero Calibration Procedure ..................................................................................................... 37
6.2.
Span Calibration Procedure .................................................................................................... 38
6.2.1.
Recommended Span Points and Acceptance limits ......................................................... 39
6.2.2.
Gas Phase Titrations ......................................................................................................... 39
6.3.
AirCal 8000 (Optional) ............................................................................................................. 39
6.3.1.
Overview ........................................................................................................................... 39
6.3.1.
Gas Cylinder Housing ....................................................................................................... 41
6.3.2.
Configuring the AirCal 8000 Scheduler ............................................................................. 41
6.4.
Calibration Standards and Equipment ..................................................................................... 42
6.4.1.
Calibration Gas ................................................................................................................. 42
6.4.2.
Recommended Span Points and Cylinder Concentrations ............................................... 42
6.4.3.
Gas cylinders .................................................................................................................... 42
6.4.4.
Gas regulators ................................................................................................................... 43
6.4.5.
Recommended fittings and Tubing for Aircal 1000 ........................................................... 44
6.5.
Calibration Frequency.............................................................................................................. 45
7.
Third Party Sensors ......................................................................................................................46
7.1.
Met One MSO .......................................................................................................................... 46
7.2.
Vaisala Weather Transmitter WXT520 .................................................................................... 46
7.3.
Gill WindSonic ......................................................................................................................... 47
7.4.
Cirrus MK427 Noise Sensor .................................................................................................... 47
7.5.
Novalynx 240-200SZ Silicon Pyranometer .............................................................................. 48
8.
Field Installation ............................................................................................................................48
8.1.
Site Selection ........................................................................................................................... 48
8.2.
Dimensions .............................................................................................................................. 49
8.3.
Mounting .................................................................................................................................. 50
9.
Maintenance...................................................................................................................................50
9.1.
Safety Requirements ............................................................................................................... 50
9.2.
Maintenance Schedule ............................................................................................................ 50
9.2.1.
Standard AQM .................................................................................................................. 50
9.2.2.
Particle Monitor ................................................................................................................. 51
9.2.3.
Profiler ............................................................................................................................... 51
9.3.
AQM Maintenance Procedures ............................................................................................... 51
9.3.1.
Replacing the Inlet Filter ................................................................................................... 51
9.3.2.
Measuring Sample Inlet Flow Rate ................................................................................... 52
9.3.3.
Gas Sensor Module Flow Rate ......................................................................................... 52
9.3.4.
Leak Check Gas Sensor Plumbing ................................................................................... 53
9.3.5.
Removing and Replacing AQM Modules .......................................................................... 54
9.4.
Particle Monitor ........................................................................................................................ 54
9.4.1.
Sample Flow Check .......................................................................................................... 54
9.4.2.
Purge Flow Check ............................................................................................................. 55
9.4.3.
Sheath Flow Check ........................................................................................................... 56
9.4.4.
Leak Check ....................................................................................................................... 56
9.4.5.
Manual Zero Air Check ..................................................................................................... 57
9.4.6.
Fibre Span Check ............................................................................................................. 57
9.4.7.
Laser Current Check. ........................................................................................................ 57
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Aeroqual AQM 65 User Guide
9.4.8.
Filter Changes ................................................................................................................... 57
9.4.9.
Cyclone and Inlet Cleaning ............................................................................................... 58
9.4.10. Changing the Size Fraction Measured .............................................................................. 59
9.5.
Profiler ..................................................................................................................................... 59
9.5.1.
Sample Flow Check and Adjustment ................................................................................... 59
9.5.2.
Sheath Flow Check ........................................................................................................... 60
9.5.3.
Leak Check ....................................................................................................................... 60
9.5.4.
Filter Changes ................................................................................................................... 61
9.5.5.
Inlet Cleaning .................................................................................................................... 62
10. Troubleshooting ............................................................................................................................62
10.1. AQM 65 Basics ........................................................................................................................ 62
10.2. Particle Monitor/Profiler ........................................................................................................... 63
10.3. Diagnostics .............................................................................................................................. 64
11. Appendix ........................................................................................................................................65
11.1. Guidelines ................................................................................................................................ 65
11.2. Technical support .................................................................................................................... 65
11.3. Copyright ................................................................................................................................. 65
11.4. Compliance .............................................................................................................................. 66
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Aeroqual AQM 65 User Guide
User Guide Revision History
Current version: 1.0
Description: User guide for AQM 65
This user guide is a newly created document for the use of the AQM 65.
Date
Revision number
Description of change
Affected
Sections
March 2015
1.0
New User Guide
All
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Aeroqual AQM 65 User Guide
1. Description
The Aeroqual AQM 65 is a compact air quality station designed for precise measurement of ambient
pollution and environmental conditions. Its platform is configurable to measure a wide range of air
pollutants such as ozone (O3), nitrogen dioxide (NO2), carbon monoxide (CO), sulphur dioxide (SO2)
PM10, and PM2.5 as well as meteorological parameters such as temperature, humidity, wind speed and
direction.
The AQM 65 is complete air quality station consisting of a custom made IP65 rated aluminium
enclosure which houses a power module, thermal management system, embedded PC running
Aeroqual Connect software and user configured analyser modules.
TSP Inlet
Sharp Cut
Cyclone
PM Inlet
Sample Inlet
PM Pump module
Inlet filter on
sample line
AirCal 8000
module
PM Engine
Gas Cylinder
Enclosure for
AirCal 8000
Gas Modules
(User Configurable)
Thermal
Management
System Module
Fuse Holder
Sample Pump
Embedded PC
Cooling ducts
12 and 0 VDC
Terminals
Compressor
Cassette
Note 1: The placement of individual modules will vary depending on the user configuration
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Aeroqual AQM 65 User Guide
1.1. External Connections
There are 4 external water tight glands located on the right hand side of the AQM 65 enclosure. The
black gland is an Ethernet output for use when a wired connection to the instrument is required (See
Section 3.1.1. for more information). The 3 other glands are designed to allow third party sensors to be
wired into the instrument.
1.2. Gas Modules
The AQM 65 can be configured with a range of gas modules. All modules are mounted onto the base
plate using 4 or 2 screws depending on the module size. Inlet and outlet tubes are connected to the gas
distribution manifold and exhaust respectively. The inlet tubing used is PFA 3.2ID x 0.75WT and the
exhaust tubing used is Tygon R3603.2ID x 1.6WT.
Sample inlet
12VDC Power
Connectors
Status LED
RJ45 Connectors for RS485 bus
Sample Exhaust
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Aeroqual AQM 65 User Guide
1.2.1. Gas Sensor Specifications
Note: The sensor specifications are subject to change; please contact Aeroqual for latest performance data
1.3. Thermal Management System
The AQM 65 has a thermal management control system to maintain a stable internal temperature
irrespective of ambient temperature changes. The TMS cassette is located at the base of the instrument
and comprises of a Danfoss compressor, IP55 cooling fan and ducting. The TMS cassette is separate
from the main enclosure and can be removed if required.
The control software is stored on the System Management module which is installed inside the main
housing. The module initiates the compressor, fans and heater when necessary to maintain the internal
temperature at a constant of within ±0.2°C.
System Management Module
ITemp Sensor
Connection
TMS
Communication
Connector
Jumpers
Note: The jumpers in the system management module should be positioned as shown in the
image above.
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Aeroqual AQM 65 User Guide
1.4. Sensirion SHT75 Temperature and Humidity Sensor
The Humidity and Temperature Sensor is a Sensirion single chip device which contains a capacitive
polymer sensing element for relative humidity and a band-gap temperature sensor. More detailed
specifications are in the table below. The temperature and humidity sensor is housed in a connector
located on the bottom of the enclosure. It is connected directly to the system manager module. For full
details visit the company website www.sensirion.com.
Air Temperature
Range
Accuracy
Resolution
Relative Humidity
-40°C to + 124°C
±0.3°C
0.01°C
Range
Accuracy
Resolution
0-100 %RH
±2 %RH
0.1 %RH
1.5. Auxiliary Module (Optional)
The auxiliary module acts as an interface between third party sensors and the AQM 65 communication
bus. It is configured with different operating modes which can be user selected by adjusting the
dipswitches located on the side of the module. Aeroqual has integrated a number of third party sensors
and is able to supply the auxiliary module preconfigured for your sensor.
Programming Port
Programming Dip
Switch
The tables below list the various functions:
Firmware: AUX_MODULE_01.
Use for: Analogue inputs, Vaisala WXT520 weather, Gill Windsonic wind, Cirrus MK: 427 noise
1
2
3
4
Function
OFF
OFF
OFF
OFF
Default - standard Auxiliary module with AN1, AN2, Freq
ON
OFF
OFF
OFF
Vaisala WXT520 with RS232 communication + AN1, AN2, Freq
OFF
ON
OFF
OFF
Vaisala WXT520 with RS232 communication + Cirrus MK427 Noise
ON
ON
OFF
OFF
Wind Sonic with RS232 communication + AN1, AN2, Freq
OFF
OFF
ON
OFF
Wind Sonic with RS232 communication + Cirrus MK427 Noise
ON
OFF
ON
OFF
Cirrus MK427 Noise module only
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Aeroqual AQM 65 User Guide
Firmware: AUX_MODULE_02.
Use for: Analogue inputs, Met One MSO weather, Met One 034b wind, Cirrus MK:427 noise.
1
2
3
4
Function
OFF
OFF
OFF
OFF
Default - standard Auxiliary module with AN1, AN2, Freq
ON
OFF
ON
OFF
Cirrus MK427 Noise module only
OFF
ON
ON
OFF
Met One MSO with RS232 communication + Cirrus MK427 Noise
ON
ON
ON
OFF
Met One MSO with RS232 communication + AN1, AN2, Freq
OFF
OFF
OFF
ON
Met One 034B analogue module + Cirrus MK427 Noise
The third party sensor needs to be correctly wired into the auxiliary module for it to function correctly.
The image and table below provide further information on wiring the auxiliary module.
Wiring of Aux Module:
Pin 1
12VDC Power
Connectors
Status LED
RJ45 Connectors
for RS485 bus
Pin 12
PIN 1: GND
PIN 2: 12V FUSED
PIN 3: RESERVED
PIN 4: RESERVED
PIN 5: RX
PIN 6: TX
PIN 7: 0-5V IN
PIN 8: 4-20mA IN
PIN 9: FREQ IN
PIN 10: AGND
PIN 11: METONE 034B PWR
PIN 12: CIRRUS ACTUATOR
Example of wiring:
Wind Sonic
Vaisala
Met One MSO
(Pin 1) GND,
SIGNAL GND
(Pin 1) GND for
operating, data &
heating
(Pin 1) GND,
SIGNAL,
COMMON, SHIELD
(Pin 2) 12V
(Pin 5) RX
(Pin 6) TX
(Pin 2) 12V for
operating & heating
(Pin 5) RX
(Pin 6) TX
(Pin 2) 12V
(Pin 5) RX
(Pin 6) TX
Met One 034B
(Pin 1) GND
(Pin 11) METONE
034B PWR
(Pin7) WD
(Pin 9) WS
Cirrus MK:427
(Pin 1) GND,
ACTUATOR GND
(Pin 2) 12V, LOOP
IN
(Pin 8) LOOP OUT
(Pin 12)
ACTUATOR IN
A programming port is also exposed through the side of the module to allow custom programs to be
loaded into the module.
Note 1: Aeroqual can supply a standard programming tool for distributors to reprogram the
auxiliary module to the specified requirements.
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Aeroqual AQM 65 User Guide
Note 2: The above wiring connections are subject to change, please refer to the third party
sensor manuals for the latest wiring instructions.
Note 3: The Wind Sonic comes with an Aeroqual supplied cable and therefore the latest wire
outputs will be sent with the cable.
1.6. Particle Monitor
The particle monitor is an optional device that can be installed in the AQM 65 to provide reliable real
time indicative particulate measurement of TSP, PM10, PM2.5 or PM1 using a well proven near forward
light scattering nephelometer and high precision sharp cut cyclone.
1.6.1. Nephelometer
Aeroqual uses a customised nephelometer optical sensor from Met One Instruments. The optical sensor
uses light scattering from particulate matter to provide a continuous real-time measurement of airborne
particle mass. The light source is a visible laser diode and scattered light is measured in the near
forward angle using a focusing optics and a photo diode.
The sensor has an on-board temperature sensor which is corrected for thermal drift, sheath air filter to
keep the optics clean, automatic baseline drift correction and a fibre optic span system to provide a
check of the optical components.
Safety: This sensor is considered a Class I laser product. Class I laser products are not
considered to be hazardous. There are no user serviceable parts inside the cover of the
sensor. The device contains a laser operating at 670 nm which is visible to the eye and can
cause damage to the eye if directly exposed. Only trained service personnel should
attempt servicing or repair of the sensor.
The electrical connections to the nephelometer are summarised below:
Wire colour
Orange (x2)
Red
Black
White
Black/white
Yellow
Grey
Function
Fibre optic solenoid
5V (power in)
Ground
Signal out (0-5 V)
Signal Ground
Laser current monitor ( 10mV = 1 mA laser current)
Temperature output
1.6.2. Inlet heater
The nephelometer uses a 12 V heater on the sample inlet tube to reduce the humidity of sampled air to
prevent particle growth and fogging of the nephelometer optics in high RH conditions.
1.6.3. Inbuilt filters
The nephelometer contains two filters which should be replaced at specified intervals. The “Sample”
filter is a coarse filter designed to protect the sample pump from excessive particle build-up. The
“Purge” filter is a fine filter which filters the sheath air flow and also produces particle-free air during the
auto-zero cycle. See Section 8.4.8 for information on changing the filters.
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Aeroqual AQM 65 User Guide
1.7. Profiler
1.7.1. Optical Particle Counter
Aeroqual uses a customised optical particle counter from Met One Instruments. The particle counter
uses scattered light to measure and count particles. Light from a laser diode is collimated to illuminate
the aerosol sample flow. When a particle is present it scatters the incident laser light which is detected
using a 60o solid angle elliptical mirror at right angles to the laser beam. The amount of scattered light is
converted to a voltage pulse and the amplitude of the pulse is calibrated to a particle diameter. The
particles are thus assigned on the basis of size to one of eight channels.
1.7.2. Connections
The connections to the optical particle counter are at the bottom of the unit. There is also a LED which
turns red if there is a fault condition. The optical unit requires an earth wire to be connected between the
housing and the 0VDC line on the power bus. Please check that this is fitted if the unit has been
replaced.
Air out
RS232 serial
LED
Green = normal
Red = fault
Not used
Not used
12 VDC in
1.7.3. Data Outputs
The Profiler can be configured to display and log the measurements detailed in the table below. The
sensor name is that used in the active sensors list and module settings.
Sensor
Name
Definition
Range
Units
8PC0.3
number of particles with diameter larger than 0.3 µm
0-100000
particles/L
8PC0.5
number of particles with diameter larger than 0.5 µm
0-100000
particles/L
8PC0.7
number of particles with diameter larger than 0.7 µm
0-100000
particles/L
8PC1.0
number of particles with diameter larger than 1.0 µm
0-100000
particles/L
8PC2.0
number of particles with diameter larger than 2.0 µm
0-100000
particles/L
8PC2.5
number of particles with diameter larger than 2.5 µm
0-100000
particles/L
8PC5.0
number of particles with diameter larger than 5.0 µm
0-100000
particles/L
8PC10
number of particles with diameter larger than 10 µm
0-100000
particles/L
PM1
Particle mass below 1 µm
200
ug/m3
PM2.5
Particle mass below 2.5 µm
2000
ug/m3
PM10
Particle mass below 10 µm
5000
ug/m3
TSP
Total suspended particle mass
5000
ug/m3
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Aeroqual AQM 65 User Guide
1.8. Particle Mass Pump Modules
The pump modules for the Nephelometer and Profiler contain a microprocessor for mass calculation
and a pump for sampling. The pump module varies depending on whether a Nephelometer or Profiler
has been installed in the AQM 65.
1.8.1. Profiler Pump Module
Sample line
Purge line
12VDC power
connection
Inlet heater connector
Power on LED
RS232 connector from
optical engine.
Termination Dongle
RS485 bus cable
Exhaust line with
flow adjuster
1.8.2. Nephelometer Pump Module
The Pump Module is split into two sections:
1. The electronics
2. The pump and pneumatics
The functionality of the electronics module can be seen below:
Connection to
Sample Pump
Connection to
Purge Pump
RJ45 Connectors for
RS485 bus
Status LED
12VDC Power
Connectors
Connection
80180 engine
PM Fibre Span Switch
Inlet Heater
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Aeroqual AQM 65 User Guide
Note: The jumpers in the current module should be positioned as shown in the previous image.
Pin 1 = 12V (blue)
Pin 3 = 12V (red)
Sample Pump
Purge Pump
Pin 2 = GND (white)
Pin 4 = GND (black)
The pump and pneumatics are easy to access for servicing and replacement:
Exhaust Line
Connection to
electronics module
(Pin 1 to 4)
Sample In
Purge
Pump
Sample Pump
Sheath Air Out
1.9. Electrical Connections
Mains Power in (Section 2.2.1)
Power supply 1
12V DC
AC
SWITCH
BOX
Power supply 2
12V DC
BOX
DC
SWITCH
BOX
Embedded PC
Mains
Power
12V DC
Power
Signal
TMS = Thermal Management
System
SM
Module
T/RH
Sensor
Gas
Module 1
Cabinet
Air in
Blower
TMS
Heater
Compressor
Gas
Module 2
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Aeroqual AQM 65 User Guide
TMS
fan
RS485 Bus
The two wire RS485 bus connections are made using 20 cm CAT5 cables between the sensor modules
12 VDC Power Bus
All modules inside the AQM 65 operate from the 12VDC power. The power is supplied by a daisy chain
of black and red cables. To turn off the 12VDC power to the upper cabinet release the fuse holder.
Status LED
Each module includes a status LED which indicates that the electrical status of the module is
functioning correctly. It does not indicate the calibration status of the module.
a) Continuous on indicates correct electrical functionality
b) Slow flash (1 second) indicates warm up period
c) Fast flash (0.2 seconds) sensor failure
d) LED not on indicates no power to module.
e) The System Manager LED is a special case. This flashes to indicate RS485 bus traffic.
1.10. Pneumatic Connections
The sample gas passes into a PFA manifold behind the left hand side wall and is distributed to the
sensors. The gas modules sample via a single pump located in the bottom left of the enclosure. The
pump is easily accessible for maintenance. The sample inlet tubing is PFA tubing which is inert and
smooth walled. The module exhaust tubing is Tygon 3603 PVC tubing.
Note: The ports on the manifold which are not used must be capped off to prevent leaks.
Note 2: The blue lines represent the sample flow and the black lines represent the exhaust flow.
Inlet
PFA manifold
Module
Module
Module
Module
Module
Module
Pump
Exhaust
Aeroqual AQM 65 User Guide
Page | 15
An adjustable bypass valve is included between the vacuum and pressure side of the pump. This is to
allow an adjustment to be made to the module flow rates and to relieve the excess pressure placed on
the pump when only one or two modules are installed.
The total sample flow rate will be dependent on the number of gas sensor modules in the AQM. All
module flows are controlled by critical orifices located within the sensor modules. See Section 8.3.3.for
expected flow rates.
2. Set Up
The purpose of this section is to enable the user to correctly assemble, configure and commission their
AQM 65 prior to field installation.
2.1. Unpacking
a) Examine the Shockwatch label on the side of the shipping box. If the indicator is red do not
refuse shipment. Make a notification on delivery receipt and inspect for damage. If damage is
discovered, leave item in original packaging and request immediate inspection from carrier
within 15 days of delivery date (3 days international).
b) Verify the serial number label on the documentation matches the serial label on the AQM
(located on inside of enclosure).
c) Verify that all components have been shipped as per the packing slip. Contact your Distributor
or Aeroqual if you suspect any parts are missing.
d) Unpack the AQM.
e) Remove all internal shipping/packaging material from the AQM enclosure.
f)
Retain the packaging.
Note: Always transport the AQM in the three piece aluminum skins with foam packing provided
to avoid breakages. Wrap all peripheral assemblies in their original packaging also. The AQM is
a sensitive instrument and should be transported with care.
2.2. Assembly
2.2.1. Connect Mains Power
Caution: The high voltage mains supply must be wired by a certified electrician in
compliance with local electrical regulations.
To connect the mains power follow the steps below:
1. Unscrew the front panel of the AQM 65 TMS cassette. There are 4 screws at each corner that
need to be removed to allow the front panel to slide off. The door must be open to access these
screws.
2. Unscrew the lid of the terminal box to access the wiring.
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Aeroqual AQM 65 User Guide
AC Switch Box
3. The mains electrical cable needs to be fed through the gland at the base of the instrument into
the terminal box.
Note 1: The AQM65 can be placed flat on its back to access the gland
Note 2: Ensure the nut gland and rubber plug have been fed through the electrical cable before
feeding the cable through the gland at the base of the instrument
4. Wire the cable to the terminal block
Connected by Aeroqual (Do
not remove)
Connected by local
electrician:
Brown = Live
Blue = Neutral
Yellow/Green = Ground
Mains electrical cable from
base of instrument
5. Tightly screw the gland at the base of the instrument to secure the cable in place and create a
waterproof seal.
6. Replace the lid of the terminal box and the front panel of the TMS cassette.
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Aeroqual AQM 65 User Guide
2.2.2. Connect Inlet System
Once the AQM 65 has been wired the inlet
system needs to be connected before the
instrument is turned on. The inlet system consists
of an inert fluoropolymer and glass inlet with
mesh fitting which is designed to prevent
unwanted materials, such as water and dust,
being drawn into the instrument. The inlet pipe is
connected to the top of the AQM 65.
Mesh
fitting
External
filter holder
A 5/8 spanner is required to securely tighten the
¼” stainless steel compression fitting.
If an external filter holder has been purchased with the AQM 65, remove the mesh fitting from the inlet
pipe and screw the filter holder into place. The arrow on the filter holder should be pointing upwards.
2.2.3. Assembly of heated inlet for PM/Profiler (Optional)
If the AQM 65 is configured with a Nephelometer or Profiler the heated inlet needs to be connected prior
to the instrument being turned on.
Parts List:
A. Inlet Tube/Heater including power cable
B. Sharp Cut Cyclone (if fitted)
C. TSP Inlet
A
B
i.
Connect parts A, B and C
ii.
Open door of enclosure and remove protective cap from the optical engine
C
Protective
Cap
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Aeroqual AQM 65 User Guide
iii.
Insert Inlet Tube Assembly through base mount and fix the three mounting screws
Note 1: Ensure the power cable is fed through the inlet hole when connecting the inlet
Mounting
Screws
iv.
Connect power to Inlet Tube/Heater inside the enclosure
Power cable from
heated inlet
2.2.4. Connect third party sensors (Optional)
Third party sensors such as the Vaisala Weather Transmitter WXT520 or Met One MSO are connected
to the unit via the external glands located on the right hand side of the enclosure. Feed the cable
through the glands and connect to the auxiliary module using the instructions in Section 1.5.
Note: Turn off the AQM 65 before plugging in any external third part sensor.
2.3. Connect to the AQM 65
Aeroqual Connect is the standard user interface which comes with the AQM instrument and allows the
user to be connected directly to the AQM instrument. It can be accessed via WiFi, Ethernet or a cellular
modem. The on-board computer has an Ethernet output for direct wired connection. . Alternatively,
connection can be made over WIFI by connecting to the AQM network (Access point mode), a local
network (Client mode) or via a modem.
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2.3.1. Initial Connection via Access Point Mode
The default setting of the instrument when first purchased will be to connect to Aeroqual Connect via
access point mode. Access point mode allows connection to the AQM via the AQM network signal
which will show up on a laptop, tablet or smart phone within range. This type of connection will most
commonly be used when working on the AQM in the field. However, it will also be used to initially
connect when the instrument first arrives.
Connecting by this mode will mean the user’s device is connected via WIFI directly to the AQM. There
will be no internet connection on the user device when using this option. To connect you will need to
select the AQM WIFI network and enter the password.
Note: The default password will be “Aeroqual”.
AQM Network
Signal
Once a WiFi connection has been made Aeroqual Connect can be accessed via the PC browser by
entering the IP address 10.10.0.1 in the address bar. The login screen below will then be displayed.
1. An Aeroqual Connect login name and password will be provided when Aeroqual Connect is first
purchased. If you do not know your login details please contact [email protected]
2. Once you have logged in the homepage will be displayed.
Note 1: Different applications will appear depending on the user accessibility configured for
your account.
Note 2: See Section 3 for more connection options
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Aeroqual AQM 65 User Guide
2.4. Initial Commissioning
The objective of the initial commissioning process is to enable the user to gain knowledge in the
operation of the instrument and to demonstrate that it is functioning correctly prior to remote installation.
The process consists of a set of tasks that check that the AQM is operating correctly.
Undertaking the commissioning procedure correctly is an important part of the product
transfer process and customer acceptance. It confirms that you have received the product
in good working order and it has been shipped to you without damage.
Equipment required:
 AQM Logbook
 PC
 Flow meter covering the range 0-2.5 LPM
 Zero air source
 Span gases corresponding to the sensors in the AQM
 Calibrator or gas flow meters for generating suitable span gas concentrations
 Humidifier (supplied in service kit)
Note: Before starting the commissioning process it is important that the AQM is fully warmed
up. Run the instrument overnight sampling either outside ambient air or indoor air with an
activated carbon filter connected to the inlet.
2.4.1. System Checks
Sensor Configuration
 Select the “Configure Instrument” application in Aeroqual Connect and check the parameters


listed under the Active Sensors heading are correct.
The sensors should match the sensors listed on the invoice and in the instrument logbook.
If they do not match add the missing sensors and remove any sensors that are not configured in
the AQM 65 (See Section 4.5.3. for more information).
Sensor Logging
 Check all the configured sensors are logging correctly in Aeroqual Connect.
 Select the “Manage Data” application and view the data in table format.
 All sensors should be reporting data with no errors.
Note: If a sensor is not reading correctly see Section 9 for troubleshooting or contact
[email protected]
TMS settings



Close the door to the AQM and run overnight.
To check the stability of the internal temperature plot ITemp vs. Time for a period of several
hours and ensure the internal temperature is stable to within ±1oC and matches the ITemp
value stated in the logbook e.g. Set point = 30°C.
Select the “Manage Data” application in Aeroqual Connect and view the ITemp chart to view the
plotted data.
Modem Communication OK (Optional)



The modem will be preconfigured at the Aeroqual factory.
To complete configuration of the modem plug directly from the modem Ethernet port to a laptop
Ethernet port, browse to 192.168.127.254. and follow the instructions in Section 3.1.2
Establish a connection to the AQM 65 via the modem to confirm the connection is successful.
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Aeroqual AQM 65 User Guide
2.4.2. System Values
AQM inlet flow
Using a volumetric flow meter record the flow on the AQM sample inlet. Check it is the same as the inlet
flow stated in the AQM logbook.
Module flows
Use a volumetric flow meter to record the flow on the inlet port of the gas modules. These should match
those of the Logbook. If the flow rate does not match the rate written on the module adjust the flow
using the AQM manifold bypass valve and/or check for leaks (see Section 9.3.4 for leak checking).
Particle Monitor/Profiler flow
If a particle monitor or profiler is present, use a volumetric flow meter to
record the flow on the external inlet. Remove the TSP head and connect
the flow meter to the top of the sharp cut cyclone. The inlet flow can be
adjusted via the bleed screw on the purge line. Afterwards replace the
inlet components with care making sure there is no leak.
Note 1: Particle Monitor inlet flow rate should be 2LPM
Note 2: Profiler inlet flow rate should be 1LPM
2.4.3. Zero and Span Checks for Gas Modules
Refer to Section 6 on how to carry out zero and span checks and calibration.
A full commissioning process will require gas calibration and flow equipment (not supplied with the AQM
65). In the absence of gas calibration and flow measurement capabilities, measurement of outside air
over a 24 hour period and comparison of this data with measurements from a local “reference” air
monitoring station will provide evidence of correct span operation.
3. Connecting to Aeroqual Connect and Cloud
As previously mentioned in Section 2.3, Aeroqual Connect is the standard user interface which comes
with the AQM 65. Access point mode is the default setting and has already been discussed in Section
2.3.1. There are several other connection options available which are all useful at different times.
Once the first connection has been made (via access point mode) the WiFi communications can be
configured according to how you would like the system to respond. This can be done via the settings tab
under the Configure Instrument application.
3.1. Connection Options
3.1.1. Client Mode
Client mode allows connection to the AQM via a local network (e.g. your office network). If there is a
local WIFI or LAN network available at the AQM installation site then the AQM can be set up to connect
to this network. This might be the case if the AQM is installed on the perimeter of an industrial site and
the WiFi network extends out to where the AQM is installed.
Alternatively the AQM 65 can be connected to the local network via an Ethernet cable from the AQM to
the local router using the Ethernet output on the side of the AQM.
When the AQM is connected to your local network (such as your office WiFi network), the local network
will automatically assign a local IP address to the AQM. The IP address assigned to the instrument can
be found in the Configure Instrument application when logged in via Aeroqual Cloud.
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Entering this IP address into the web browser will open Aeroqual Connect for that specific instrument,
assuming you are within the local network.
If the local network allows outside access (e.g. via VPN), connection to the AQM can be made from
anywhere in the world. In the more common scenario where the local network does not permit outside
access you may still connect to the AQM using Aeroqual Cloud through the internet because most local
networks permit internet access.
To configure the AQM to use client mode the instrument needs to be configured via the settings tab
under the Configure Instrument application.
1. The WiFi mode needs to be set to Client
2. The WiFi SSID (local network name) needs to be entered (e.g. your office WiFi name)
3. The WiFi password needs to be entered (e.g. the password for your office WiFi)
Note 1: Before changing the WIFI settings it recommended that you have another connection to
the instrument established – typically by connecting the instrument to your LAN using the
Ethernet connection and using Connect with the LAN IP address.
Note 2: Once WiFi client mode is set up Aeroqual Connect will automatically disconnect from
WiFi access point mode. Connection will then need to be made via Aeroqual Cloud (See section
3.2) to see the local IP address assigned to the instrument.
Note 3: If the local WiFi network password changes or you enter it incorrectly, you could be
locked out of the AQM. If this happens you will need to re-set the AQM back to factory default
settings, which puts the AQM back in to Access Point mode with a default password. You can
then reconfigure the settings correctly. Contact [email protected] for information on how
to perform this process.
3.1.2. Cellular Network Connection
If the AQM has an IP modem installed in the instrument a connection can be made via a cellular
network. This option is useful when remote access to the AQM is required but there is no local network
signal at the AQM installation site so client mode cannot be used.
Note1: A local data telecommunications contract and SIM card is required.
Note 2: The AQM 65 uses approximately 30 megabytes per sensor per month. Choose a data
plan appropriate to the expected data use on the AQM 65.
1. The IP modem will need to be set up by plugging directly from the modem Ethernet port to a
laptop Ethernet port and browsing to 192.168.127.254.
2. In the menu select Network Settings  GSM GPRS Settings and configure settings as per
picture below. Contact your SIM card provider to obtain full ATD and APN settings. Click Submit
button.
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3. Unplug MOXA unit from the network and plug it into AQM65 embedded PC. Restart AQM65
embedded PC and modem.
4. In the Configure Instrument application the Ethernet Mode setting needs to be set to Auto
(DHCP). WiFi mode should still be set to Access Point so a direct connection can still be made.
5. If you do not wish to use Aeroqual Cloud, a DynDNS service will need to be set up to create a
permanent web address for the AQM.
6. A Dyn account can be created at https://account.dyn.com/cart/?via=upgrade-now
7. Log in to your account and add a new host name:
8. Go back to MOXA modem configuration interface, and choose System Management - > Misc.
Network Settings - > DDNS. Select enable and DynDns.org. Input the host name created in Dyn
account, user name and password as well for the Dyn account. Then click Submit button, Save
and Restart. Now the modem should be ready to be connected via host name.
9. Enter the set up web address into the web browser to access Aeroqual Connect.
Note 1: No data is stored on the DynDNS server. It only acts as an access point to communicate
with the AQM.
Note 2: In some countries the telecommunications provider will block incoming requests to the
modem. If this is the case DynDns will not work with regular SIM cards. Contact your
telecommunications company about using an APN or use a private APN.
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Aeroqual AQM 65 User Guide
3.2. Aeroqual Cloud
When using Aeroqual Cloud, the user is connected to the Aeroqual Cloud server. The AQM instrument
is also connected to the Cloud server. The user connects to Cloud over the internet; the AQM is
connected to the Cloud server using WiFi, Ethernet or Cellular (modem required). Aeroqual Cloud is a
website.
Aeroqual Cloud allows management of either a single AQM unit or a network of AQM units by using any
internet-enabled browser.
Aeroqual Cloud has all of the control features of Aeroqual Connect. The additional benefits of having
Aeroqual Cloud include:
 Data from the AQM is backed up to a secure server. In Aeroqual Connect, data is only stored
on the on-board PC.
 Data is available even if the instrument is turned off.
 Email and SMS alerts can be set up
 It is easy to manage multiple instruments at the same time.
 There is a faster connection when compared to Aeroqual Connect
 Reduced data costs
As a user, you simply access Aeroqual cloud through the internet; Aeroqual Cloud is a website which
provides total control over your AQM. You will need to go to http://cloud.aeroqual.com and enter your
login name and password.
Note 1: If you do not know your login name and password please contact [email protected]
As well as having access to all the features available in Aeroqual Connect, Aeroqual Cloud can be used
to manage a network of AQMs. Depending on the user accessibility configured to your account, AQM
units can be managed by Organisations and Networks. This feature is available in the Administration
application.
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Aeroqual AQM 65 User Guide
Organisations
Networks
Instruments
The AQM must have internet access for you to see it and control it using the Cloud website.
For the AQM to have internet access it must be either in Client mode, as described above, and be on a
network which permits internet access (most networks do permit internet access). A modem is not
required in this situation.
Or if a local network is not available, the AQM must have an IP modem installed and a SIM card and
data contract with a local telecommunications provider.
3.2.1. Manual Sync
If the AQM is outside of cellular and WiFi range, the AQM data can always be downloaded to your
device using a WiFi access point (see Section 2.3.1.) when at the AQM site. The data will be
downloaded to an unreadable file and will include all information stored on the AQM on-board PC. The
file can then be uploaded onto Aeroqual Cloud, once a WiFi or cellular network is available, to view the
data from the unit, including diagnostics and settings.
To download the data: In Aeroqual Connect select Manual Sync in the Manage Data application. Here
it will prompt you to select a location on your PC to download the data to.
To upload the data: In Aeroqual Cloud select Manual Sync in the Manage Data application. Here it will
prompt you to upload the file which was previously downloaded from Aeroqual Connect.
Note 1: If there is a lot of data to download from Aeroqual Connect multiple manual syncs may
need to be performed. The date in the manual sync function updates showing how much data
has been downloaded.
Aeroqual Connect is the lead system. If both the Aeroqual Connect and Cloud systems are
being run simultaneously, any changes made in Aeroqual Connect will override the
changes made in Aeroqual Cloud.
3.3. Connection Scenarios
There are a number of ways to connect to the AQM instrument using Aeroqual Connect or Aeroqual
Cloud. To help clarify which connection should be used please refer to the tables below which shows
the 4 most common scenarios.
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User
Location
Recommended Connection
Office/Lab
Office/Lab
The AQM should be connected to the office WIFI network using client
mode. You can then connect using Aeroqual Cloud. Aeroqual
technicians will also be able to connect using Aeroqual Cloud if
support is required. A wired Ethernet connection can also be made
from the AQM direct to the local router.
AQM in the field and
modem is installed
Office
If the AQM is on a 3G network permanently you can connect using
Aeroqual Cloud from your office at any time.
AQM in the field and
modem is installed
At AQM
site
If you are in the field with the AQM, you can connect directly to the
AQM via Aeroqual Connect using the AQM as an access point
AQM in the field and
no modem installed
At AQM
site
If you are in the field with the AQM and there is no 3G available you
can connect as an access point while in the field. Use manual sync to
upload data to Aeroqual Cloud when back in the office and WIFI is
available.
AQM Location
If you are not using Aeroqual Cloud there are 3 options:
AQM Location
User Location
AQM in the field and
modem is installed
Office
AQM in the field and
modem is installed
At AQM site
AQM in the field
At AQM site
Recommended Connection
If the AQM is on a 3G network permanently use a DYDNS
service to connect directly to the AQM via Aeroqual Connect.
If you are in the field with the AQM, you can connect directly to
the AQM via Aeroqual Connect using the AQM as an access
point
If there is no 3G available you can only connect to the AQM
using WIFI access point whilst on site.
4. Using Aeroqual Connect and Cloud
Aeroqual Connect and Cloud have a range of applications available which allow the user to access
data, assess performance, schedule calibrations and diagnose faults remotely.
4.1. Journal
The journal can be accessed by selecting Journal on the menu bar located at the top of the screen. It is
used to log when any changes are made to the AQM. The journal is searchable by date using the side
bar and filtered via the drop down menu.
The filter allows entries to be searched by:
 User Entry – Manually entered journal entries
 Calibration – Changes associated to calibration e.g. gain and offset modifications and
notification when service actions start and stop
 Configuration – Changes made to the AQM configuration e.g. sensor added or communications
altered
 Module Settings – Changes made to the sensor module settings
 System changes – Notifies when the AQM starts up, shuts down or is rebooted
Note 1: To manually create a journal entry select “Add user entry”, type in the relevant
information and press save.
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Note 2: Service mode is initiated by starting “Manual Service Mode” in the Calibration and
Service application. A journal entry will be automatically generated when the service is started
and stopped.
4.2. Manage Data
The manage data application allows the user to view the data either as a chart or in a table. There is the
option to view the raw or averaged data as well as the ability to filter the data to show specific time
periods. The data can also be exported for further analysis within this application.
Note: Manual sync can be found under the manage data application (See Section 3.2.1.)
4.2.1. Charts



To view the data in graphical format select the “Charts” option.
The charts can be configured to view a specific time period using the “From” and “To” dates
shown at the top of the screen.
An averaging period can also be selected from the drop down menu
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4.2.2. Table


To view the data in a table select the “Table” option.
The data can be configured to view a specific time period using the “From” and “To” dates
shown at the top of the screen.

The data can also be filtered using the “Averaging Period” drop down menu to display:
o Raw data
o 1 minute averages
o 15 minute averages
o 1 hour averages
o 8 hour averages
o Daily averages
Note: The Inlet column is used to show the status of the instrument. During normal running the
Inlet column will display “sample”. This will change to show when the unit is undergoing a
calibration or service.
4.2.3. Download Data



Data can be downloaded by selecting “Download Data”.
A specific data set can be chosen for download by using the “From” and “To” date selection.
The Journal can also be downloaded if required.
Note: The data will be downloaded in csv. format
4.2.4. Auto Export (Only Available in Aeroqual Cloud)
The auto export option allows the data to be automatically exported to either a selected email address
or to an FTP server. To set either of these features up they need to be enabled by selecting the enable
check box under the auto export option.
Email: To enable auto export to a specific email the frequency, format and averaging period needs to
be selected. There is also the option to include the journal in the export. Make sure a correct email
address is entered and save the changes for it to take effect.
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FTP: To enable auto export to a FTP server the frequency, format and averaging period needs to be
selected. There is also the option to include the journal in the export. The FTP server, user name and
password also need to be entered correctly. Save the changes for it to take effect.
Note: The journal captures any error messages; these are particularly useful for
troubleshooting.
4.3. Calibration and Service
The calibration and service application allows the user to perform manual adjustments to the gain and
offset settings for all the modules installed in the AQM. If an AirCal 8000 is installed automatic span and
zero checks can also be configured in this application.
4.3.1. Gain and Offset

Selecting the “Gain and Offset” menu will display the gain and offsets for all the configured
modules in the AQM. Between 5 and 50 real time measurements will also be displayed, as well
as the average and standard deviation for the shown readings. These numbers will
automatically update.

Prior to any manual calibration or servicing activities the “Manual Service Mode” button should
be started. This will ensure the raw data is highlighted and labelled appropriately to show that a
service is being performed. This is particularly helpful to alert when a calibration has taken
place to ensure the readings are disregarded from any future data analysis.
Note 1: Any flagged data is disregarded when calculating averaged readings.
Note 2: Remember to stop the “Manual Service Mode” after the service has been completed to
ensure future reported data is tagged as “Sample” data.
Note 3: The Manual Service Mode will automatically stop after 24 hours if left running.

The calibration parameters can be adjusted manually by clicking the setting that requires
changing, entering the new value and pressing save.
4.3.2. AirCal 8000

If an AirCal 8000 is configured, the option to set up and run the calibration will be shown in the
Calibration and Service application.
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Note: If the AirCal 8000 tab does not appear please check the system has been set up to show
the calibration system is connected. Please read Section 4.5 which explains how to do this in the
Configuration application.

Zero air and span gas can be set to release at a specific time for a chosen running period.
1. When the calibration table (Run 1) is first accessed there will be no information in the
cells describing the point configuration.
2. To configure the points click in the relevant cell and select either Zero, Span Port 1 or
Span Port 2.
3. The dilution ratio and run time will also need to be configured for Zero, Port 1 and Port
2. This is dependent on the concentration in the gas cylinder and the concentration
required for calibration.
Note 1: The dilution ratio can be calculated by using the equation and information in Section
6.3.1.
Note 2: A maximum of 5 points can be configured. This is useful if a mixed gas cylinder is being
used and a different dilution ratio is required for each gas.
4. Once the table has been configured correctly the AirCal can be set to run at a user
defined time on a daily, weekly or monthly basis using the configuration options above
the table.
Note 4: Remember to check the “Enabled” box to initiate the schedule. Alternatively, the
calibration can be run immediately by starting the “Manual Run”.
5. A maximum of 3 runs can be configured.
6. To configure the run schedule, enter the port, dilution ratio and run time information in
the remaining tables under “Run 2” and “Run 3”. Finally set the frequency and start time
for each run to take place.
4.4. Diagnostics and Advanced
The diagnostics and advanced application allows the user to view the sensor module settings as well as
the sensor diagnostics. This information is useful when fault diagnosing an issue with a module. The
diagnostic data can be exported for further analysis and the sensor module settings can be updated or
modified in this application.
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4.4.1. Diagnostics


The diagnostics view will display the
sensor diagnostics for the selected
parameter. The data can be paused or
exported using the buttons above the
table.
40 minutes of data will be displayed at a
time and the data will automatically
update unless the pause button is
pressed.
4.4.2. Module Settings
The module settings view will show the individual sensor module settings and version number for all the
parameters configured inside the AQM.
 The module settings can be changed by selecting the value that needs changing, entering the
new value and clicking save.
Note: Incorrect modification of sensor module settings may cause irreversible damage. Do not
change settings without contacting Aeroqual or a qualified service agent.
4.5. Configure Instrument
The configure instrument application stores all the configuration settings relevant for the specific AQM
connected. Depending on the user type different features will be accessible. The application can also
be used to view a complete sensor list for all sensors that can be configured on the AQM, filter data and
set up SMS and email alerts.
4.5.1. Settings
The settings tab is split into 4 columns which display different information relevant to the AQM.
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4.5.2. Configuring the System







The serial number is listed here. It cannot be changed and is also shown on the log
book and inside the AQM enclosure.
The name of the instrument can be set by the user, for example, to reflect the
location or customer that is running the AQM
The device, software version and time last contact was made with the cloud server
is listed here for reference.
If an AirCal 8000 is installed in the AQM the “Auto Calibration Module Installed” will
be set to AirCal 8000. This will ensure the AirCal 8000 tab is displayed under the
Calibration and Service application.
The time zone of the AQM can be set here to display the correct date for the region
the AQM is installed in.
Service time out can be set here. This is important if the manual service mode is
left on by accident. The time out value will stop manual service mode after the time
period set.
The restart instrument checkbox will force a restart of the embedded PC. The
checkbox will be cleared automatically after restart.
4.5.3. Configuring the Sensors



The default unit of measurement is ppm gas sensors and ug/m3 for PM sensors.
The poll interval and poll time out functions will control how often data is polled from
the AQM station to the user interface. These should not be changed.
The active sensors will be displayed here. If a sensor module has been added the
sensor will need to be selected from the drop down menu and added to the active
sensors list. Sensors can also be removed by clicking on the sensor name.
Note 1: For information on the legacy section please contact Aeroqual.
Note 2: For information on the communications section please see Section 3.
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Aeroqual AQM 65 User Guide
4.5.4. Alerts (Only Available in Aeroqual Cloud)
SMS and email alerts can be set up in this section.
Alerts can be set to notify when:
1. a concentration exceeds the user defined set
point
2. a sensor fails
3. the AQM is in operation mode
4. the AQM goes offline
An email address and/or SMS number needs to be
entered into the relevant fields to allow the alerts to
be sent. Multiple alerts can be set up by pressing the
Add a new alert button.
Note: Phone numbers need to be in the format
+64234566 with no spaces. A space is treated as a
separate phone number.
4.5.5. Sensor List
The sensor list tab displays all the sensors that can be configured into the AQM. The table is mainly for
reference and shows all the settings configured for each sensor e.g. the units and conversion factors. If
a new sensor list is released it can be imported in this section.
4.5.6. Data filters
The negative number filter can be turned on for specific
parameters in this section. If you do not want the data to
show negative numbers for certain parameters, check the
checkbox of that specific parameter. Any negative
numbers reported will now show as zero.
Note: The negative number filter is NOT applied to
RAW readings. It is applied to all averaged readings.
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Aeroqual AQM 65 User Guide
5. Gas Module Calibration
Calibration is an activity that requires attention to detail and accuracy. You should read this entire
calibration section and understand it before starting, even if you are an experienced practitioner.
5.1. Introduction
Key calibration concepts to understand before starting are given below.

Zero and span adjustments on the AQM 65 are performed by adjusting the OFFSET and GAIN
values which are located in the Calibration and Service application on Aeroqual Cloud/Connect.
The equation that relates the OFFSET and GAIN to the instrument reading is given below:
AQM65 Reading = GAIN x (Sensor Module Output - OFFSET)

The gas modules in the AQM 65 are calibrated by applying certified gas to the AQM 65 inlet
and monitoring their response on the Calibration and Service App in Aeroqual Cloud/Connect

All zero and span calibrations or checks should be performed with gas mixtures in a balance of
air. The calibration standard may be in a balance of nitrogen (N 2) but it should be diluted by at
least 50 times with air before exposing to the AQM.

Fluorocarbon (PTFE, PVDF, FEP or PFA) tubing should be used for all gas delivery lines to the
AQM65. Fittings should be stainless steel or fluorocarbon.

The AQM 65 is supplied with a thermal management system to maintain a stable internal
temperature. You must calibrate the AQM with the door closed to enable the unit to stabilize at
its correct temperature.

Run the AQM for at least 6 hours before attempting a gas sensor calibration.

Zero and span gas needs to have a minimum level of humidity in order for the sensors to
perform correctly. This is a key difference compared with reference analyzer calibrations which
are typically performed with very dry calibration gases. It is recommended that you purchase an
Aircal 1000 or 8000 for calibrating the AQM65.
5.2. Calibration Gas Humidity
Aeroqual’s gas sensor calibration can be adversely affected by the very dry (dew point < -20oC) air
generated by third party calibration sources. It is strongly recommended that you purchase an Aircal
8000 or Aircal 1000 portable calibrator for calibrating the AQM65. These calibrators are specially
designed to optimally prepare the calibration gases for the AQM65. If you are using an Aircal 8000 or an
Aircal 1000 you do not need to use the additional nafion humidifier.
If you are using a third party calibrator with a dry zero air source or a cylinder of zero air then you will
need to humidify the calibration gases before they are delivered to the AQM65. Aeroqual supplies with
the AQM65 service kit a nafion humidifier for this purpose. It contains a nafion membrane from
Permapure (www.permapure.com) which allows the transport of water molecules across the membrane
with high selectivity and no loss of calibration gases.
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Aeroqual AQM 65 User Guide
Calibration system
Aircal 1000
Aircal 8000
2B 306 O3 calibrator
Zero air generator with dryer (e.g.
Teledyne 701, Sabio 1001, Environics
7000)
Zero air cylinder
Direct span injection
Nafion Humidifier Required
(Yes/No)
No
No
No
Yes
Yes
Yes
Nafion Humidifier Instructions for use:
 Remove the lid and fill the humidifier with clean water up to the top of the label, covering the
black internal tubing. Refit the lid.
 Connect the humidifier inline between the outlet from your dilution calibrator and the inlet of
the AQM65.
 Set the calibration gas flow to a flow rate of between 3-5 LPM to generate a humidity level
of 25 to 40% RH at an indoor temperature of 22oC

The nafion tube will become contaminated over time and should be changed every 2 years.
6. Calibration setup
The recommended calibration setup is shown for both Aircal 1000 and third party systems in the
diagrams below. The sampling cane inlet on the AQM65 should be removed and the calibration gas to
be delivered to the instrument via a T fitting to allow excess flow to be vented. Do not pressurize the
AQM65.
It is convenient to use ¼ inch OD or 6 mm OD PTFE tubing for the sample delivery lines from the
calibrator to the instrument and a stainless steel or PTFE compression fitting for the T.
Aircal 1000 Calibration System
Aircal
1000
Excess flow
Calibration gas
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Aeroqual AQM 65 User Guide
Third Party Calibration System
Zero Air
Generator
Dilution
Calibrator
Nafion
Humidifier
Excess flow
Calibration gas
6.1. Zero Calibration Procedure
1. Ensure the AQM65 has been powered on for at least 6 hours before starting, the door is closed
and the internal temperature is stable.
2. Check the sample inlet flow to make sure it matches the factory performance report value. If not
check for leaks. Do not proceed further until you are satisfied the sample flow is correct.
3. Setup the required calibration equipment, login to Aeroqual Cloud/Connect and launch the
Calibration and Service App.
4. Turn on the zero air to the AQM and establish a flow rate 2-4 LPM to the T-fitting.
5. Check there is excess flow at the exhaust of the T-fitting
6. Allow the AQM to sample the zero air until stable readings are obtained (about 30 minutes) on
the Real time measurements window. If the Real time Average readings are outside the
acceptable limits in the table below then the gas sensor modules will require an OFFSET
adjustment. If the average readings are within the acceptable limits then the OFFSET does not
need to be changed.
Sensor
O3, NO2, NOx,
SO2, H2S
CO
NMHC
PID
CO2
Acceptable average zero
reading/ ppm
0.000 +/- 0.002
0.000 +/- 0.050
0.000 +/- 0.050
0.000 +/- 0.010
0 +/- 10
7. To calculate the new OFFSET for each sensor use the equation below.
New OFFSET = Old OFFSET + (AQM 65 gas reading/Gain factor)
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Aeroqual AQM 65 User Guide
8. Adjust the OFFSET values for each gas sensor in the Calibration and Service application by
entering the new value in the table circled in red in the picture below.
6.2. Span Calibration Procedure
1. Please perform a zero calibration before starting a span. Confirm the sample flow is correct, the
door is closed and the internal temperature is stable.
2. Setup the required calibration equipment, login to Aeroqual Cloud/Connect and launch the
Calibration and Service App.
3. Turn on the span gas to the AQM and establish a flow rate 1-4 LPM to the T-fitting.
4. Check there is excess flow at the exhaust of the T-fitting and this vented safely.
5. Allow the AQM to sample the span gas until stable readings are obtained (about 30 minutes) on
the Real time measurements window. If the Real time Average readings are outside of the
acceptable limits for the span point (see section 6.2.1) then the gas sensor modules will require
a GAIN adjustment. If the average readings are within the acceptable limits then the GAIN does
not need to be changed.
6. Calculate the new gain.
New Gain factor = Old Gain factor x Span Gas Concentration / AQM 65 Gas Reading
7. Adjust the GAIN values for each gas sensor in the Calibration and Service application by
entering the new GAIN directly into the table circled in red in the picture below.
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Aeroqual AQM 65 User Guide
Note: All calibration adjustments are recorded in the Journal
6.2.1. Recommended Span Points and Acceptance limits
A table of recommended single span concentrations for AQM sensor modules is given in the table
below as well as the acceptance limits for the points. A more detailed table of calibration points
including gas standards is given in section
Gas
Span Point / ppm
O3, NO2
NOx
CO
VOC (isobutylene)
SO2, H2S
NMHC (isobutylene)
CO2
PID (isobutylene)
0.1
0.2
5
10
0.2
10
1000
10
Acceptance
limits
+/- 0.005
+/- 0.010
+/-0.1
+/-0.5
+/-0.01
+/-0.5
+/-40
+/-0.2
6.2.2. Gas Phase Titrations
A dilution calibrator with a built in O3 source will allow a Gas Phase Titration (GPT) of NO to NO2. The
advantage of this method of generating NO2 is that it enables the use of the more stable NO gas for
NO2 sensor calibrations. The Aircal 1000 does not have this facility. If you plan to use a calibrator with
GPT capability you should only use a small excess of O3 (<0.025 ppm) because excessive O3 may
adversely affect the NO2 calibration.
Alternatively use an excess of NO to enable a NOx calibration simultaneously. For example, a setting of
0.2 NO and 0.1 O3 would produce 0.1 ppm NO2 and 0.2 ppm NOx.
6.3. AirCal 8000 (Optional)
The AirCal 8000 is an integrated calibration system for the AQM 65. It consists of three main
components:
1. Housing: Gas cylinder housing with regulators
2. Gas Dilution Module: 2 span gas inputs with a zero air mass flow meter (MFM) 0-3
SLPM and a mass flow controller (MFC) 0-0.05 SLPM.
3. Zero Air Source: Scrubbing media activated carbon, Purafil chemisorbant and heated
carulite
6.3.1. Overview
The AirCal system delivers a controlled concentration of calibration gas for calibration of ambient gas
instruments. To do this the calibration gas inside the cylinder is mixed with zero air, which is generated
by the scrubbing material inside the AirCal 8000 module. The calibration gas is therefore diluted by the
zero air to provide a given concentration which is directed into the AQM 65. The concentration of
calibration gas is calculated using a dilution ratio which is determined by the zero air and cylinder gas
flow rates.
The zero air generator will deliver a flow rate of approximately 2 – 2.5 LPM. The flow rate of the zero air
is monitored using a mass flow meter (MFM).
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Aeroqual AQM 65 User Guide
The flow rate of the cylinder gas is controlled dynamically using a mass flow controller (MFC). The
cylinder gas flow rate can range from between 0.005 – 0.045 LPM. The MFC will adjust the flow of the
calibration gas so as to maintain a user defined dilution ratio according the equation:
The user dilution ratio needs to be calculated in order to deliver the required concentration of calibration
gas.
Example: If 10ppm of CO was required and the cylinder concentration is 1000ppm, then the required
dilution ratio would be 100. The dilution ratio of 100 will be entered into the table located in the AirCal
8000 tab under the Calibration and Service Application. The MFC flow rate will automatically adjust to
meet the desired calibration gas concentration.
Note: The MFM and MFC flow rates can be logged and displayed in Aeroqual Connect/Cloud by
adding them to the sensor list (see Section 4.5.3.).
Note: All AirCal 8000 procedures will be logged in the Journal.
The pneumatics of the AirCal 8000 system can be seen below:
PORT 1
Solenoid
Port 1
MFC/MFM block
PORT 2
TO MANIFOLD
MFC/MFM
Gas INLET
Solenoid
Port 2
MFC/MFM
Air OUTLET
Solenoid
Zero air
MFC/MFM
Air INLET
PTFE 5um filter
ZERO AIR INLET
Pump
Heated carulite cartridge
Activated carbon filter
Purafil filter
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Aeroqual AQM 65 User Guide
6.3.1. Gas cylinder Housing
Gas bottles
The AirCal 8000 system allows for two gas bottles to be contained in a secure compartment on the side
wall of the AQM enclosure.
To achieve the best performance from the AirCal 8000 it is important to connect gas cylinders with gas
concentrations which are appropriate for the calibration being performed. Example cylinder
concentrations are as follows:
Gas
CO
NO / NO2
Isobutylene for
PID / NMHC
SO2 / H2S
Recommended
Cylinder
concentration ppm
1000
Maximum
Concentration
Achievable ppm
20
Minimum
concentration
achievable ppm
2
20
0.4
0.04
1000
20
2
50
1
0.2
Note 1: The recommended dilution ratio range is between 50 and 500
Note 2: If the cylinder contains calibration gas in a balance of Nitrogen, a minimum dilution ratio
of 50 should be used
Gas lines in to AQM
The regulator provides gas into the AQM via 1/8 OD stainless steel tube
with a 1/8 compression fitting at the end of the tube to allow connection to
the regulator.
Regulators
The AirCal 8000 comes supplied with 2x two stage regulators designed for
Calgaz style bottles. The maximum input pressure allowed into the first
stage is 3000 psi. The inlet fitting is a ¼ FNPT. The regulator is also
supplied with a ¼ FNPT to 5/8 x 18 thread fitting which will allow it to be
attached to many commercially available gas cylinders including the
Calgaz range.
The outlet fitting from the regulator is a 1/8 FNPT thread fitting. The
regulator is supplied with a 1/8 FNPT to ¼ Swagelok compression fitting.
Gas Connection
Screw the gas cylinder into the stainless steel regulator and adjust the
pressure valve (screw in) until the outlet pressure is 9 PSI.
6.3.2. Configuring the AirCal 8000 scheduler
Calibration can be configured to run at a set time for a chosen running period. See Section 4.3.2. for
information on setting up the run scheduler in Aeroqual Connect/Cloud. The gain and offset parameters
can then be adjusted as described in Section 6.1. and 6.2.
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Aeroqual AQM 65 User Guide
6.4. Calibration Standards and Equipment
6.4.1. Calibration Gas
There are several considerations to be made when selecting gases for span calibration of the AQM. The
first is which gas composition to purchase and at what concentration. The size of gas cylinder must also
be considered.
The gases required for performing a calibration using the direct method are different from those needed
to perform a calibration using the dilution method. Aeroqual does not recommend direct delivery of
calibration gas standards.
Dilution Method
Calibration gas is purchased at high concentrations and is then diluted to the appropriate span
concentrations. The gas can be purchased in a balance of air or nitrogen. If you purchase the
AirCal1000 or AirCal8000, you will perform a zero calibration with the built in zero air generator without
the need to purchase a cylinder of zero air.
Direct Method
In this method the calibration gas is not diluted but directly delivered from the cylinder to the instrument.
This is not recommended because most gases are not stable for long at the low concentrations used by
the AQM65. If this method is used you must purchase span gas with balance of air only. If you are
calibrating using the direct method, you will also need to purchase a cylinder of certified zero air in
order to perform a zero (baseline) calibration. You will also need to humidify the gas if using the nafion
humidifier.
6.4.2. Recommended Span points and Cylinder concentrations
MODULE
Module Span
Range
O3
0.5
ppm
NO2
0.2
ppm
Recommended
Span Gas
O3
NO2
Recommended
single span
point
0.1
Recommended
5 point linearity
checks
Recommended
cylinder
concentrations
for dilution
method
Recommended
cylinder/source
concentrations
for direct
method
(Balance air)
NOx
0.5
ppm
NO
(or
NO2)
CO
25
ppm
SO2
10
ppm
PID
20
ppm
CO2
2000
ppm
H2S
CO
SO2
C4H8
CO2
H2S
C4H8
0.1
0.2
10
0.25
10
1000
0.25
10
0.2,
0.150,
0.1,
0.05, 0
0.2,
0.15,
0.1,
0.05,0
0.5,
0.25,
0.1,
0.05,
0
20,
10,
5,
2.5,
0
0.5,
0.25,
0.1,
0.05,
0
20,
10, 5,
2.5, 0
1000,
750,
500,
250, 0
0.5,
0.25,
0.1,
0.05, 0
20,
10, 5,
2.5, 0
N/A
25
50
1000
25
1000
50000
25
1000
0.1
0.1
0.2
10
0.25
10
1000
0.25
10
10 ppm
NMHC
25
ppm
6.4.3. Gas cylinders
There are many cylinder sizes available from small portable cylinders through to larger cylinders. Both
the small and large gas cylinders can be used to calibrate the AQM. The smaller cylinders are more
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Aeroqual AQM 65 User Guide
convenient especially for field calibrations, the larger cylinders will last longer but will be more difficult to
transport to the site where the AQM is installed and these issues should be considered when selecting a
cylinder size.
It is important to understand how long your gas cylinder will last so that you can plan your gas cylinder
purchases. To plan your purchases you must understand:
1.
2.
3.
4.
5.
What volume of gas your cylinder holds
How much gas you will use per calibration
The frequency of calibrations
The number of AQM stations requiring calibration
The expiry date of the calibration gas (different gases have different expiry dates)
A few considerations to remember:
 Smaller gas cylinders, such as the 58L size from CalGaz, hold approximately 58 litres of
calibration gas.
 As a general rule (a conservative estimate) you will use approximately 1 to 2 litres of gas per
AQM gas module when performing a calibration if using the dilution method.
 You will use 15 to 30 litres per calibration if using the direct method. Depending on what
calibration frequency you decide upon, you can then calculate how long the cylinder will last.
The three images below demonstrate a small portable gas cylinder (size 58L) from CalGaz, and a large
and medium size cylinder from AirLiquide. All sizes are suitable for use with the Aeroqual Aircal1000
and AQM, the decision as to which size is best to use is based upon the considerations discussed
above.
6.4.4. Gas regulators
You must make sure that the regulator you purchase fits onto your gas cylinder. Note that different
cylinders have different fittings. Your gas cylinder supplier should be able to recommend or supply
either a suitable fixed flow regulator or a two stage regulator depending on your needs. The same
regulator may not be able to be used for all gases because of incompatibilities between the material of
the regulator and the gas, make sure you check the regulator/gas compatibility with your regulator
supplier.
A two stage pressure regulator is recommended for all gas cylinders for best control and safety. An
example of a suitable two stage regular for use with Calgaz type bottles is the Model 1001 CGA
available from Aeroqual (see regulator on the left image below).
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Aeroqual AQM 65 User Guide
If you need to calibrate using the direct method you will need to purchase a flow regulator. The flow rate
should exceed the inlet flow rate of your AQM. The recommended fixed flow rate is 1.0 LPM. An
example of a fixed flow regulator is shown on the right hand image.
Regulator gas fittings: Barb vs Compression fitting
It is also important to make sure you have the correct gas outlet fitting on the regulator. A barb fitting is
not suitable for use with the pressure regulator (dilution calibration method). For this you will need to
purchase a gas compression fitting like that shown in the images below. A barb fitting is acceptable if
the fixed flow regulator (direct calibration method) is being used. Your regulator supplier may or may not
be able to supply a suitable fitting.
6.4.5. Recommended fittings and tubing for Aircal 1000
The Aeroqual AirCal1000 gas inlet ports are stainless steel 1/8” compression fittings. Aeroqual
recommends using 1/8” OD PTFE tubing for calibration gas which requires 1/8” compression fittings to
connect the AirCal1000 to the pressure regulator. The fitting on the AirCal1000 comes with the
appropriate compression fitting, but you must complete the connection to the gas regulator.
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Aeroqual AQM 65 User Guide
If your pressure regulator has a 1/8” Female NPT thread you should purchase part number
SS-200-1-2 from Swagelok This is fitting 1 in the above image.
If your pressure regulator has a ¼” Female NPT thread you should purchase part number
SS-200-1-4 from Swagelok This is fitting 2 in the above image.
See the following video for WHEN and HOW to apply PTFE tape.
http://norcal.swagelok.com/blog/bid/88017/Skill-Applying-PTFE-tape-to-tapered-pipe-threads
6.5. Calibration Frequency
Calibration is an activity that requires attention to detail and accuracy and therefore its frequency is a
balance between the costs of service and data uncertainty. For some applications such as compliance
monitoring the calibration frequency may be regulated, for others it is a choice. The optimum frequency
will depend on the importance of the dataset, the support budget and the stability of the instrument
under the prevailing conditions. At the high cost end of the spectrum are national ambient monitoring
networks and the USEPA Quality Assurance Handbook (see http://www.epa.gov/ttnamti1/qalist.html ) is
a good example of how prescriptive calibration requirements for such applications can be.
Aeroqual makes the following recommendations about calibration frequency for the AQM65
1. Follow all regulatory calibration requirements if these are defined for the AQM65 monitoring
purpose.
2. Always calibrate or check the instrument response after the following events:
o Relocation of the instrument
o Repairs or service that might affect its calibration
o A power interruption in operation of more than a few days
o Upon any indication of instrument malfunction or change in calibration
3. Plan routine calibrations at an interval that is consistent with the importance of the data quality.
Calibration interval guidance is given in the table below.
Maximum AQM65 calibration intervals for different environmental conditions and required data
quality.
Data Quality
Highest
Medium
Lower
Benign
Monthly
2 month
3 month
Environmental Conditions
Moderate
2 weeks
1 month
6 weeks
Demanding
1 week
2 weeks
3 month
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Aeroqual AQM 65 User Guide
7. Third Party Sensors
7.1. Met One MSO
Description:
Specifications:
Measures wind speed and direction; air temperature; relative
humidity; and barometric pressure
For full details visit the company website www.metone.com
Wind Speed
Range
Accuracy
Resolution
Wind Direction
Range
Accuracy
Resolution
Air Temperature
Range
Accuracy
Resolution
Relative Humidity
Range
Accuracy
Resolution
Barometric Pressure
Range
Accuracy
Resolution
0-50 m/s
±2%
0.1 m/s
0-360°
±5°
1°
-40°C - +60°C
±0.5°C
0.1°C
0-100%
±4%
1%
500-1100 mbars
± 2 mbars
0.1 mbar
7.2. Vaisala Weather Transmitter WXT520
Description:
Measures wind speed and direction; liquid precipitation;
barometric pressure; air temperature; and relative humidity
Specifications:
For full details visit the company website www.vaisala.com
Wind Speed
Range
Accuracy
0-60 m/s
±3% (0-35 m/s)
Wind Direction
Range
Accuracy
0-360°
±3°
Liquid Precipitation
Rainfall
Output Resolution
Barometric Pressure
Range
Accuracy
Air Temperature
Range
Accuracy @ +20 °C
Relative Humidity
0.1mm/min
600-1100 hPa
±1 hPa @ -52 to +60 °C
-52 to +60 °C
±0.3 °C
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Aeroqual AQM 65 User Guide
Measurement range
Accuracy
0-100 %RH
±3 %RH (0-90 %RH); ±5 %RH (90-100
%RH)
7.3. Gill WindSonic
Description:
Specifications:
2-axis ultrasonic wind sensor, measures wind speed and
direction
For full details visit the company website www.gill.co.uk
Wind Speed
Range
Accuracy
Resolution
Wind Direction
Range
Accuracy
Resolution
0-60 m/s
±2⁰ @ 12 m/s
0.01 m/s
0-359° (no dead band)
±3⁰ @ 12 m/s
1°
7.4. Cirrus MK427 Noise Sensor
Description:
Specifications:
Outdoor environmental noise meter:
For full details visit the website www.cirrus-environmental.com/
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Aeroqual AQM 65 User Guide
Frequency Weighting
Automatic Calibration
Measurement Range
Resolution
dB(A) to IEC 61672-1:2002
Electrostatic Actuator System with DC
voltage control
30 – 100dB(A)
0.1 dBA
7.5. Novalynx 240-200SZ Silicon Pyranometer
Description:
Specifications:
Outdoor environmental solar radiation meter:
For full details visit the website www.novalynx.com/
Sensor
Accuracy
Sensitivity
Linearity
Resolution
Temperature
dependence
Operating
temperature
High stability silicon voltaic detector
± 5% typical under natural daylight conditions
100 µA per 1000 W/m² typical
Max deviation of 1% up to 3000 W/m²
0.1 W/m2
0.15% per °C max
-40°C to +65°C (-40°F to +149°F)
8. Field Installation
8.1. Site Selection
Careful consideration needs to be taken when selecting the air quality monitoring site.
The key AQM site selection considerations are:
1.
Placement - local walls, buildings, trees etc. will affect the gas concentrations at a microspatial level. Please refer to the discussion of placement guidelines written by the EPA in
document 40 CFR 58, Appendix E.
2.
Access – the AQM 65 will require servicing and calibration. Therefore the site should be
easily accessible for personnel to undertake calibration without placing themselves at risk. The
site may also need to be secure so care is needed to ensure both accessibility and security is
taken into account.
3.
Environmental - the installation site should be selected to minimize exposure to

Dust (avoid sites where windblown soil and debris is present)

Vibration (avoid support structures close to trains, trams, heavy trucks)

Weather extremes (avoid solar exposure, wind chill)

Power outages (fit a UPS if power outages are expected)
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Aeroqual AQM 65 User Guide
4.
Interferences - the site should be selected to minimize exposure to interferences from point
sources such as industrial plant, restaurants, swimming pools, etc. unless the purpose is
specifically to monitor such sites. If in doubt please contact Aeroqual.
8.2. Dimensions
The AQM 65 dimensions can be seen in the diagrams below.
Standard AQM 65
AQM 65 with AirCal 8000
Note 1: The dimensions are reported in mm
Note 2: The PM inlet will add an additional 480mm to the height of the AQM 65
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Aeroqual AQM 65 User Guide
8.3. Mounting
The AQM 65 unit is approximately 30kg and therefore needs a foundation to support this weight.
The AQM 65 comes with a pole mounting kit. This consists of two sets of U
bolts with 4 nuts and 4 spring washers. This provides flexibility as to where
the unit can be mounted. The U bolts specifications are 3-1/2 PIPE X 3/8
304 U BOLT.
If a sample inlet extension is required, use inert tubing such as PTFE or PFA
smooth wall tubing to minimize contamination and reaction of the sample
line. Maximum recommended length is 5 m.
9. Maintenance
9.1. Safety Requirements

Replacement of any part should only be carried out by qualified personnel using only parts from
the manufacturer

Always disconnect power source before removing or replacing any components

Surfaces marked with a "Caution, Hot Surface" and an internationally recognised symbol may
get hot and deliver burns

If installed, the 80180 Particle Monitor is a Class 1 laser product and is not considered
dangerous if used correctly. It should not be powered up with the cover removed.
9.2. Maintenance Schedule
The following tables outline a typical periodic maintenance schedule for the AQM 65, Particle Monitor
and Profiler. This schedule is based on experience under normal conditions and may need to be
modified to suit specific operating conditions. Calibration checks are normally performed at an interval
consistent with regulatory policy or if none exists, consistent with the data use.
Maintenance instructions for all other third party equipment can be found in the relevant User Guide for
that instrument. These can be found on the USB stick supplied with your instrument.
9.2.1. Standard AQM
Procedure
Section
Frequency
Change AQM Inlet Filter
7.3.1.
Weekly
Gas Sensor Zero/Span
Calibration
4.0.
Monthly
Check Sample Inlet Flow Rate
7.3.2.
Quarterly
Check Gas Sensor Module
Flow Rate
7.3.3.
Yearly
Leak Check Gas Sensor
Plumbing
7.3.3.
Yearly
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Aeroqual AQM 65 User Guide
9.2.2. Particle Monitor
Procedure
Section
Frequency
Sample Flow Check
7.4.1.
Monthly
Purge Flow Check
7.4.2.
Monthly
Sheath Flow Check
7.4.3.
Monthly
Manual Zero Air Check
7.4.5.
Monthly
Fibre Span Check
7.4.6.
Monthly
Laser current check
7.4.7.
Monthly
Filter Changes
7.4.8.
6 to 12 months
Cyclone and Inlet Cleaning
7.4.9.
3 Months
Cyclone Disassembly
7.4.9.
12 Months
Optical sensor factory
calibration
Contact Aeroqual
24 Months
9.2.3. Profiler
Procedure
Section
Frequency
Sample Flow Check
7.5.1.
Monthly
Sheath Flow Check
7.5.2.
Monthly
Manual Zero Air Check
7.4.5.
Monthly
Filter Changes
7.5.4.
6 to 12 months
Inlet Cleaning
7.5.5.
6 months
Factory Calibration
Contact Aeroqual
Annual
9.3. AQM Maintenance Procedures
9.3.1. Replacing the Inlet Filter
The 5µm inlet filter should be replaced every 1-2 weeks depending on the
specific conditions of the monitoring environment. Unscrew and unplug the filter
and replace. Ensure there are no leaks at the seal when new filter is installed.
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Aeroqual AQM 65 User Guide
9.3.2. Measuring Sample Inlet Flow Rate
Using a volumetric flow meter record the flow on the AQM sample inlet. Check it is the same as the inlet
flow stated in the AQM 65 logbook. Connect the air outlet side of the flow meter to the sample inlet and
leave the air inlet side of the flow meter open to atmosphere.
Note: The inlet flow can also be measured via connection of the flow meter to the inlet filter.
9.3.3. Gas Sensor Module Flow Rate
Using a volumetric flow meter record the flow on the gas sensor module inlet.
 Disconnect the sample inlet connection from the gas sensor module and connect the volumetric
flow meter.
 Connect the air outlet side of the flow meter to the gas sensor module inlet and leave the air
inlet side of the flow meter open to atmosphere.
AQM 65

Verify that the module flow rates are within the expected levels as shown in the table below.
SAMPLE PUMP
GAS MANIFOLD
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Aeroqual AQM 65 User Guide
Note 3: The sum of the module flow rates should be equal to the sample inlet flow rate.
Module
Inlet Flow (LPM)
AQM sample inlet flow depends on configuration
0.060 to 1.5 LPM
PM10 & PM2.5 sample
2.000 LPM
PM10 & PM2.5 sheath
0.100 LPM
PM10 & PM2.5 flow during zero cycle
0.3 to 0.5 LPM
Particle Profiler inlet and exhaust
1.0 LPM
Ozone
0.100 to 0.150
NO2
0.055 to 0.065
CO
0.100 to 0.150
SO2
0.055 to 0.065
H2S
0.055 to 0.065
VOC
0.100 to 0.150
NMHC
0.100 to 0.150
CO2
0.100 to 0.150
PID
0.100 to 0.150
9.3.4. Leak Check Gas Sensor Plumbing
You will need a 0-2 LPM flow meter and a 0-0.5 LPM flow meter, tubing, and a 2 LPM diaphragm pump
Sensor Modules
 O3 and NO2 modules can be leak tested by attaching a 0-0.5 LPM flow meter to the outlet and
checking that the flow drops to 0 LPM when the inlet is blocked off. If not there is a leak.
Disassemble the module and check the connections and tubing. If no obvious leaks are found
the module should be reassembled and returned to the manufacturer.
 Other gas modules should be leak tested by disconnecting the inlet and outlet tubing. Connect
a diaphragm pump to the outlet of the module and check the flow drops to 0 LPM when the inlet
is blocked off. If not there is a leak. Disassemble the module and check the connections and
tubing. If no obvious leaks are found the module should be reassembled and returned to the
manufacturer.
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Aeroqual AQM 65 User Guide
9.3.5. Removing and Replacing AQM Modules
All modules are mounted onto the base plate with 4 screws.
To remove a module, follow these steps:
1.
Turn off AQM
2.
Remove all air tubes, plugs and cabling fitted to the particular module.
3.
Loosen the 4 screws holding the module to the base plate.
4.
Slide the module into the screw holder slots and remove module.
5.
Cap the un-used tubing connections to avoid contamination with luer caps supplied with the
unit.
6.
Ensure that the power and communication connections are reconnected for all modules.
7.
Reconfigure the active sensor list under the Configure Instrument application to represent
the new module configuration.
To replace the sensor module reverse this process ensuring that the module fixes back onto the base
plate securely and that the air tubes are replaced and firmly fitted to prevent any air leakage.
9.4. Particle Monitor
9.4.1. Sample Flow Check
A constant flow is essential to ensure the sharp cut cyclone is
separating out the correct particle size to be measured e.g. PM10
or PM2.5. To measure the flow, remove the TSP head from the
inlet and connect the volumetric flow meter to the top of the sharp
cut cyclone using the adaptor supplied with the instrument.
Ensure the flow meter is on a steady surface before reading the
flow rate.
Note 1: The adaptor tubing should be connected to the TOP of the volumetric flow meter
(negative flow)
Note 2: The flow should be 2.0 LPM
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Aeroqual AQM 65 User Guide
The PM inlet flow can be adjusted via the flow adjuster on the exhaust and purge line.
 If the flow is less than 2.0 LPM then close the purge flow screw (turn clockwise) until 2.0
LPM is achieved.
 If the flow is greater than 2.0 LPM then open the purge flow screw (turn anticlockwise) until
the flow is 2.0 LPM.
 If you can’t adjust the flow to 2 LPM using the purge flow screw then close (clockwise) the
exhaust flow screw until 2.0 LPM is achieved.
Afterwards replace the inlet components with care making sure there is no leak.
Purge
adjustment
Exhaust
adjustment
9.4.2. Purge Flow Check
Initiate the purge cycle in Aeroqual Connect or Cloud. The purge cycle is designed to pump air
backwards through the optical engine as a cleaning mechanism. It also acts as a zero air check and
adjusts the zero automatically. This will occur every 12 hours (720 minutes) automatically. To check the
purge flow is operating correctly:
 Enter the Diagnostics and Advanced application and select the Module Settings tab.
 In the settings table change the TIMA for the PM parameter to 1.000 (1minute) and click save.
Use a volumetric flow meter to record the flow using the same steps as measuring the sample flow.
Note 1: The adaptor tubing needs to be connected to the BOTTOM of the volumetric flow meter
(positive flow)
Note 2: The flow rate should be > 0.3 LPM
If the flow is less than 0.3 LPM then open the Purge Adjuster by turning the adjustment anti-clockwise
until 0.3 LPM is reached.
Note 3: Remember to reset the TIMA to 720. It may take a few moments for the purge cycle to
complete. The unit can also be restarted to stop the purge cycle.
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Aeroqual AQM 65 User Guide
Note 4: It is important to re-measure the inlet sample flow rate following a purge flow
adjustment. The sample flow rate must be stable at 2.0 LPM.
9.4.3. Sheath Flow Check
The sheath flow is a constant stream of air which ensures the optics
remains clean. It is important this is working correctly to maintain the
accuracy of the measurement. In order to check the flow, a
volumetric flow meter needs to be connected between the purge
flow adjuster and particle engine as seen in the diagram.
Note 1: The flow should be approximately 0.2 LPM
9.4.4. Leak Check
If the correct sample, purge or sheath flow cannot be achieved,
there may be a leak in the pump module or 80180 engine. First check the entire flow system:




Remove the purge connection from the module and plug the end of the purge line
Remove the TSP head and block the PM inlet.
Connected the pressure end of a flow meter to the exhaust port of the module.
If there is no leak the flow should drop to zero.
Exhaust Line
Sample connection
(remove to check
module)
Purge connection (remove to
check whole flow system)
If the flow does not drop to zero it suggests there is a leak somewhere in the system. To check the
pump module:




Keep the purge line disconnected.
Remove the sample connection and cap off the module sample port.
Connect the exhaust port of the module to the pressure end of a flow meter.
The flow should drop to zero.
If there is no leak in the pump system check the tubing and connectors along the flow path carefully. If
you cannot isolate the leak it is likely the leak is located in the engine. In this case, the engine will need
to be sent back to the Aeroqual factory. Please contact technical support.
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Aeroqual AQM 65 User Guide
If there is a leak in the pump system the tubing should be checked. If the source of the leak cannot be
found, the module will need to be sent back to the Aeroqual factory. Please contact technical support.
9.4.5. Manual Zero Air Check
A zero air check can also be carried out manually as a way to ensure the purge is working correctly. To
do this the TSP inlet needs to be removed and the particle filter (supplied in the service kit) needs to be
attached to the monitor. Ensure there is a good seal around the cyclone inlet.
The filter will remove 99.99% of particulates from ambient air. Wait 5 minutes and then check the
readings on the control module. The reported value should be 0 +/- 3 µg/m3. If it is not then the auto
zero cycle is not performing correctly. You will need to check the purge filter (Section 8.4.8.) and
replace if dirty and also check the purge flow to make sure it is correct.
9.4.6. Fibre Span Check
Perform a manual zero air check first then initiate the fibre span by turning the switch on the Particle
Monitor to on. The fibre span check is used to detect any major component failures such as the laser,
photo detector or lens. Wait approximately 4 minutes until the measurement value increases and record
the PM10 measurement from the controller. The fibre span measurement should be within ± 20% of the
fibre span concentration noted in the logbook. If it is significantly lower, then either the module optics
are dirty or the laser is ageing. Contact Aeroqual for advice.
9.4.7. Laser Current Check.
To determine the laser current go to the Diagnostics and Advanced application and select the
Diagnostics tab. The column titled “Laser current (mA)” will provide the laser current reading. If the laser
current has drifted up or down by more than 3mA, the engine may need servicing; please contact
Aeroqual for advice.
Note: The laser current should be stable at 12 ±3 mA
9.4.8. Filter Changes
There are two internal filters which are located on the side of the optical engine. They are designed to
provide protection and clean purge air. These will become dirty and must be replaced periodically.
To do this, unscrew the filters from the side of the optical engine and replace with new filters. These can
be purchased from Aeroqual. Please contact technical support for a quotation.
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Aeroqual AQM 65 User Guide
Clean
Filter
Sample
Filter
Dirty
Filter
Purge
Filter
9.4.9. Cyclone and Inlet Cleaning
The dust cap of the sharp cut cyclone will accumulate particulate matter and will need to be periodically
cleaned. Blow out the cyclone with compressed air and unscrew the dust cap and clean. Replace the
cap tightly and ensure there are no potential leaks.
The cyclone can be disassembled completely by removing the three Allen head screws and pulling it
apart. The internal parts should be cleaned with isopropyl alcohol once a year.
Allen head
screws
The TSP inlet can also be dismantled by unscrewing the 3 screws and separating the head into two
parts. Use a lint-free cloth wetted with isopropyl alcohol to clean both the inside and outside of the inlet.
Screws
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Aeroqual AQM 65 User Guide
9.4.10. Changing the Size Fraction Measured
The PM engine installed can be configured to measure different size fractions by changing the sharp cut
cyclone connected to the inlet. To ensure the correct size fraction is reported the AQM 65 needs to be
reconfigured.
1. Change the PWMH value for the PM module
a. Enter the Diagnostics and Advanced application and select Module Settings. The
PWMH value needs to be changed to match the new sharp cut cyclone size fraction
installed.
b. Click on the relevant PM module PWMH parameter and change the value in
accordance to the table below and press save.
2. Change the sensor configuration
a. Go to the Configure Instrument application and select Settings. Under the active
sensors list remove the PM sensor previously installed by pressing the x. Then add the
new PM
sensor from the drop
Sharp cut installed
PWML Value
down
list.
TSP
4
9.5. Profiler
PM10
PM2.5
PM1
3
2
1
9.5.1. Sample
Adjustment
Flow Check and
A set flow rate is essential to ensure consistency in the measurement. To measure the flow, remove the
TSP head and connect the volumetric flow meter to the top of the inlet using the adaptor supplied with
the instrument. Ensure the flow meter is on a steady surface before reading the flow rate.
Note 1: The adaptor tubing should be connected to the TOP of the volumetric flow meter
(negative flow)
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Aeroqual AQM 65 User Guide
Note 2: The flow should be 1.0 LPM
Exhaust
adjustment
The inlet flow can be adjusted via the flow adjuster on the exhaust line.
 If the flow is greater than 1.0 LPM then close the exhaust flow screw (turn clockwise) until
1.0 LPM is achieved.
 If the flow is less than 1.0 LPM then open the exhaust flow screw (turn anticlockwise) until
the flow is 1.0 LPM.
Afterwards replace the inlet components with care making sure there is no leak.
9.5.2. Sheath Flow Check
9722-1
The sheath flow is a constant stream of air which ensures the
optics remains clean. It is important this is working correctly to
maintain the accuracy of the measurement. In order to check
the flow, a volumetric flow meter needs to be connected
between the purge flow adjuster and particle engine as seen in
the diagram.
Note 1: The flow should be approximately 1-1.5LPM
9.5.3.
Leak Check
If the correct sample or sheath flow cannot be achieved, there
may be a leak in the pump module or engine. First check the
entire flow system:




Remove the purge connection from the module and plug the end of the purge line
Remove the TSP head and block the PM inlet.
Connected the pressure end of a flow meter to the exhaust port of the module.
If there is no leak the flow should drop to zero.
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Aeroqual AQM 65 User Guide
Sample connection
(remove to check
module)
Purge connection
(remove to check
whole flow system)
If the flow does not drop to zero it suggests there is a leak somewhere in the system. To check the
pump module:




Keep the purge line disconnected.
Remove the sample connection and cap off the module sample port.
Connect the exhaust port of the module to the pressure end of a flow meter.
The flow should drop to zero.
If there is a leak in the pump module the module will need to be sent back to the Aeroqual factory.
Please contact technical support.
If there is no leak in the pump module it is likely the leak is located in the engine. In this case, the
engine will need to be sent back to the Aeroqual factory. Please contact technical support.
9.5.4. Filter Changes
There are two green filters which are located to the left of the sample filter holder. They are designed to
provide protection to the pump and optical window. The filters will become dirty and must be replaced
periodically.
To do this, unclip the filters from the connectors and replace. Ensure the filters are connected the right
way in accordance to the flow arrow. These filters can be purchased from Aeroqual. Please contact
technical support for a quotation.
BQ filter – Zero air filter
DQ filter – Sample air filter
Connects to
sample on profiler
module
Connects to top of
Profiler Engine
BQ
DQ
Connects to purge
on profiler module
Connects to
bottom of Profiler
Engine
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Aeroqual AQM 65 User Guide
9.5.5. Inlet Cleaning
The TSP inlet can be dismantled by unscrewing the 3 screws and separating the head into two parts.
Use a lint-free cloth wetted with isopropyl alcohol to clean both the inside and outside of the inlet.
Screws
10. Troubleshooting
10.1. AQM 65 Basics
Symptom
Gas sensor readings
incorrect
NO2 sensor reading very high
Gas Sensor readings noisy or
unstable
Possible Cause
Fault isolation/Solution
Insufficient warm up
Allow the sensors to fully warm up
after power down. This may take 2-3
hours.
Incorrect zero calibration
Repeat zero calibration with clean air.
Incorrect span calibration
Perform span check.
Sensor module leaking
Check for leaks
Sensor pump failed
Measure flow. If pump has failed
replace.
Sensor module parameters
have been corrupted or lost.
Go into Diagnostics menu and review
Module parameter table. Compare
with logbook.
Incorrect zero calibration
Repeat zero calibration with clean air.
O3 Scrubber failed
Expose the NO2 sensor with 0.1 ppm
of O3. If the response is large (>0.5
ppm) then the scrubber has failed.
Replace.
Leaks
Leaks dilute the sample stream and
can cause low span readings and
incorrect zero readings. Perform a
leak test.
Calibration incorrect
Repeat calibration
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Aeroqual AQM 65 User Guide
Blank in Data table
(No response)
Occasional Blankin Data
Table
Module is faulty
Replace module
Particle filter
Replace if dirty
No Response from Sensor
module. Not connected
correctly
Check that the electrical connectors
on the sensor modules are firmly
connected.
Bus cable
Check RS485 bus cable continuity.
RS485 bus cable is faulty
Replace bus cable.
Module RS485 chip faulty
Remove one module at a time to
identify faulty module and then
replace.
10.2. Particle Monitor/Profiler
Symptom
Possible Cause
Fault isolation/Solution
PM values seem incorrect
Sample flow incorrect
Check sample flow and adjust to
correct value using flow adjusters
Sample and/or purge filters
dirty
Replace filters
Gain factors incorrect
Perform span calibration
Offset factor incorrect
Perform zero calibration
Laser is old
Laser needs replacing.
The laser current can be
measured under the
Diagnostics and Advanced
application. If above 20 mA
then fault
Send to your authorised distributor or
contact Aeroqual technical support.
Dirty optics
Optics need cleaning
Check H0 value for PM in
Module Parameter Table. Ig
above 0.1 then optics are dirty
Send to your authorised distributor or
contact Aeroqual technical support.
Dirty optics
Optics need cleaning
Low Sensitivity
Low Sensitivity
Noisy Readings
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Aeroqual AQM 65 User Guide
Laser is old
Send to your authorised distributor or
contact Aeroqual technical support.
Laser needs replacing.
Send to your authorised distributor or
contact Aeroqual technical support.
Negative readings
Fibre Span has changed
significantly since installation
Purge filter new and shedding
particles
Run zero cycles until purge filter no
longer shedding particles.
Purge flow zero
Adjust purge flow
Purge filter dirty
Replace purge filter
Dirty Optics
Optics need cleaning
Laser is old
Send to your authorised distributor or
contact Aeroqual technical support.
Laser needs replacing.
Send to your authorised distributor or
contact Aeroqual technical support.
Readings flat
Laser failed (check laser
current)
Photo-detector failed
Laser needs replacing.
Send to your authorised distributor or
contact Aeroqual technical support.
Send optical engine to Met One for
replacement detector and calibration.
10.3. Diagnostics
The AQM has a number of sources for diagnostic information if a problem arises. These are described
below:
Journal: All instrument events are logged in the Journal which can be accessed in Aeroqual Connect or
Cloud.
Messages: This is located on the Aeroqual Connect and Cloud tool bar. If the AQM 65 is connected to
the computer then event messages will be written to the Messages window in real-time.
Diagnostics: This is located under the Diagnostics and Advanced application. Individual sensor
modules can be interrogated to determine if there is a problem which may not have been picked up by
normal fault detection. Please consult Aeroqual Technical Support to understand how to read the
diagnostics for different modules.
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Aeroqual AQM 65 User Guide
11. Appendix
11.1. Guidelines

USE SENSIBLY
Use only as per this user guide.

USE AEROQUAL APPROVED SERVICE
Only approved service personnel must work on this product.

ACCESSORIES
Use only approved accessories. Do not connect incompatible products.

CONNECTING TO OTHER DEVICES
When connecting to any other device, read the appropriate user guide for detailed safety
instructions. Do not connect incompatible products.

HAZARDOUS ENVIRONMENTS
Do not use the monitor in or near volatile fuel or chemicals.

HEALTH AND SAFETY IN THE WORKPLACE
Aeroqual Monitors and Sensor Heads are used to monitor ambient gas concentrations.
Aeroqual does not guarantee user safety. In hazardous environments, an appropriate Health
and Safety plan should be in place.
11.2. Technical support
Technical information, service and spare parts are available through your distributor. In addition,
worldwide technical support is available from Aeroqual Ltd.
Please contact:
Aeroqual Limited
109 Valley Road, Mt Eden, Auckland 1024, New Zealand
Phone: +64 9 623 3013
Fax: +64 9 623 3012
Email: [email protected]
To return items for service/repair please contact [email protected] for an RMA number.
11.3. Copyright
Copyright Aeroqual Limited. All rights reserved. Reproduction, transfer, distribution or storage of part or
all of the contents of this document in any form without the prior written permission of Aeroqual Limited
is prohibited.
“Aeroqual” is a registered trademark of Aeroqual Limited. Other product and company names
mentioned herein may also be trademarks or trade names.
Aeroqual operates a policy of continuous development. Aeroqual reserves the right to make changes
and improvements to any of the products described in this document without prior notice.
Under no circumstances shall Aeroqual be responsible for any loss of data or income or any special,
incidental, consequential or indirect damages howsoever caused.
The contents of this document are provided "as is". Except as required by applicable law, no warranties
of any kind, either express or implied, including, but not limited to, the implied warranties of
merchantability and fitness for a particular purpose, are made in relation to the accuracy, reliability or
contents of this document.
Aeroqual reserves the right to revise this document or withdraw it at any time without prior notice. The
availability of particular products may vary by region. Please check with the Aeroqual dealer nearest to
you.
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Aeroqual AQM 65 User Guide
© Aeroqual Limited 2015. All rights reserved.
11.4. Compliance
1. The Aeroqual AQM 65 Monitor complies with EN 61000-6-1:2001
2. The Aeroqual AQM 65 Monitor complies with EN 61000-6-3:2001
3. The Aeroqual AQM 65 Monitor complies with Part 15 of the FCC Rules. Operation is subject to
the following two conditions: (1) these devices may not cause harmful interference, and (2)
these devices must accept any interference received, including interference that may cause
undesired operation.
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.
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Aeroqual AQM 65 User Guide
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