Indoor Air Quality Meter AQM4
INSTRUCTION MANUAL
Indoor Air Quality Meter
AQM4
HOLD
MIN
MAX
AVG
CO 2 CO TADPWBT
CAL
REC AM
Re call PM
O
C
F
O
%rh
(386) 872-7665
www.CO2Meter.com
INTRODUCTION
Thank you for purchasing the UEi AQM4 IAQ
meter. The meter measures CO² levels, CO
levels, air temperature, dew point, wet bulb
temperature, and humidity. The AQM4 is an
ideal instrument for indoor air quality (IAQ)
diagnosis.
Poor indoor air quality causes tiredness,
inability to concentrate, and even illness
(ex. Sick Building Syndrome). IAQ monitoring
and surveying especially for CO² levels
and air ventilation has become widely
applied in public offices, classrooms,
factories, hospitals, and hotels. It is also
recommended for regulating standards of
industrial air quality in some countries.
The portable AQM4 uses NDIR (nondispersive infrared) technology for CO²
measurement to ensure reliability and longterm stability. It is useful in verifying HVAC
systems performance and air ventilation
control.
CO is a colorless, odorless, and tasteless
gas which is slightly lighter than air. It is
highly toxic to humans and animals. Carbon
Monoxide is measured using a long-life
electrochemical sensor.
Maximum indoor air quality CO level per
ASHRAE Residential standards 62-1989 for
living area is under 9ppm. It is necessary to
evacuate employees from enclosed spaces
if the CO concentration exceeds 100ppm per
OSHA exposure limit.
1
FEATURES
• Large LCD display with blue backlight for use in dark areas
• One touch to display CO² / dew point / temperature / wet bulb temperature / air temperature / humidity / CO in sequence
• Designed with NDIR waveguide technology CO² sensor
• Programmable CO level alarm
• Extended drift compensation on
CO² sensor
• Audible alarm (~ 80db) threshold setting
• Max and Min functions included (TWA and STEL for CO² only)
• Mini USB to PC download function
for analysis
• 99 points manual recording
• 8000 points auto recording
• Review 99 points manual record
from meter
• Hold function freezes current readings
• Housing designed to help air ventilation for quick and accurate response.
• Easy to manually calibrate CO² to fresh air (380-420ppm)
MATERIAL SUPPLIED
This package contains:
• Meter
• 4 AA batteries
• Mini USB cable and software CD
• Operation manual
• Hard carrying case
• 33% calibration salt
• 75% calibration salt
• AC Power Adapter
2
POWER SUPPLY
The meter is powered by either 4 AA
batteries or a DC adaptor (9V/1A output.)
Install the batteries into the battery
compartment on the rear of the instrument.
Verify correct polarity and solid contact.
When an adaptor is used, it will cut off
the power supply from the batteries. The
adaptor can not be used as a battery
charger.
When battery voltage gets low, will
appear on the LCD (Fig. 1.) The CO² sensor
accuracy is compromised under low
batteries, replace with fresh batteries or
connect to an adaptor.
LCD DISPLAY
PRIMARY LCD
SECONDARY
LCD
3
SYMBOLS
Primary LCD Measured and calculated values
Secondary LCDReal time clock
CO²
Carbon dioxide reading
CO
Carbon monoxide reading
HOLD
Readings are frozen
MIN/MAX
Minimum/maximum readings
STEL
Short-term exposure limit (15 minutes weighted average)*
TWA
Time weighted average
(8 hours)*
Low battery indicator
DP
Dew point temperature
TA
Air temperature
WBT
Wet bulb temperature
%RH
Percentage of relative humidity
°C/°F
Celsius/Fahrenheit scale
CAL
In calibration status
REC
In manual/automatic logging
RECALL
In manual records recall mode
*CO² Only
KEYPAD
Turns the meter on or off.
Press and hold to enter setup mode
while meter is off.
Press
while turning the meter
on to disable auto power off.
Exits setup/recall page. Press and
hold to start automatic logging.
Press to switch display mode.
Press and hold to enter memory
recall mode.
4
KEYPAD CONT.
Freezes the current readings. Selects
unit or increases value in setup.
Cancels data hold function.
Press to manually record the
reading. Selects unit or decreases
value in setup.
Displays MIN, MAX, TWA, STEL
function. Saves and finishes settings
while in sleep mode.
OPERATION
POWER ON/OFF
Press
to turn the meter on and off. At
power up, the meter emits a short beep and
begins 30 second warm-up countdown
(Fig. 2), then enters normal mode with
current CO² and real time displays (Fig. 3).
NOTE:
THE REAL TIME DISPLAYS DATE
(YY-MM-DD) AND TIME IN SEQUENCE.
TAKING MEASUREMENT
The meter starts measurements when
powered on and updates readings every
second. In the condition of an operating
environment change, (ex. high to low temp)
it takes 30 seconds for the CO² sensor to
respond and 30 minutes for RH sensor.
NOTE: DO NOT HOLD THE METER IN
CLOSE PROXIMITY TO THE FACE AS
EXHALED BREATH AFFECTS CO² LEVELS.
5
CO² (CARBON DIOXIDE)
Press
to switch the mode to CO². CO²
concentration will display in ppm on primary
display (Fig. 4). The lower display shows the
real time clock.
AIR, (DP, WBT, TA ) TEMPERATURES
Press
to switch to temperature display
(Fig. 5). In the AQM4, dew point temperature
and wet bulb temperature are also available
by repeated pressing of
(Fig 6). The
lower display shows the real time clock.
HUMIDITY
Press
to switch to humidity display
(Fig. 7). The lower display shows the real
time clock.
CO (CARBON MONOXIDE)
Press
to switch the mode to CO. CO
concentration will display in ppm on primary
display (Fig. 8). The lower display shows the
real time clock.
6
DATA HOLD
In normal display mode, press
to freeze
the readings, the "HOLD" icon is displayed
on the left top of the LCD (Fig. 9). All current
readings are kept unchanged. Press
to cycle through all held readings.
While in "HOLD" mode, STEL and TWA will
continue updating every 5 minutes.
BACKLIGHT
The backlight will be activated for 10
seconds by pressing any key.
MIN, MAX, STEL, TWA
This meter allows you to check the minimum
and maximum, STEL and TWA values
calculated since power on. Under normal
mode, press
to see the minimum,
maximum, STEL and TWA and real time
sequence. Each press of
, displays
MIN, MAX, STEL, TWA in sequence and
returns to current value (Fig 10 - 13). STEL
and TWA values are calculated for CO² only.
If the meter is turned on for less than
15 minutes, the STEL value will be the
weighted average of readings taken since
power on. This is also true for TWA values
displayed prior to 8 hours. It takes at least
5 minutes to calculate STEL and TWA.
The display shows "----" during the first 5
minutes from power on.
7
In the MAX/MIN/STEL/TWA modes, it
shows the corresponding readings on the
main display and the real time clock on the
lower display.
In this mode, press
to switch the
displayed parameters (Fig 14).
The displayed sequence in this mode is MIN
MAX STEL TWA. Press
key to return to
live readings.
"HOLD", "Manually Record", Record" and
"Recall" functions are all available when
meter is in MIN/MAX/AVG mode.
To clear the MIN/MAX/AVG since power
on, restart the meter or press
for more
than 2 seconds to clear previous data and
restart.
NOTE:
TWA & STEL ARE FOR CO2
ONLY. MIN/MAX ARE FOR ALL
PARAMETERS
8
MANUALLY RECORDING
The meter features 99 manual memory
locations.
In normal or hold mode, press key to
record,
icon and main display flash for
about 3 seconds. The main display shows
the memory serial number. The AQM4 has
99 locations. (Fig. 15)
Each memory contains all parameters
(CO², CO, TA....%rh), not limited to the
selected parameter on the main display.
If the reading
changes quickly,
press
to
freeze the reading
before manually
recording the data.
99 MEMORIES RECALL
In normal or hold mode, press
more than 2 seconds until the
flashes.
key for
icon
Press
or
to scroll through the
memory locations. The memory serial
number displays on the main LCD first and
then readings stored in that location.
(Fig. 16 & 17)
9
Press
key to switch the display
parameter. (Fig. 18)
The time displayed in memory recall mode is
the recording time of this memory.
To escape the memory recall mode, press key to leave and return to normal
display.
ALARM
The meter features an audible alarm to give
warnings when CO concentration exceeds
a pre-set limit. (See Pg 12, P20 for setting
alarm threshold.) It emits beeps (Abt. 80dB)
when CO level goes over the set value and
stops only when the readings fall below the
set value. It beeps again when value goes
over the limit.
The meter can automatically record readings
of CO²/CO/TEMPERATURE/RH for extended
environment monitoring. The memory
capacity is 8,000 points. Users can set up
sampling rate from 1 second to 4 hours, 59
minutes and 59 seconds. (See pg 11, P40)
After sampling rate is selected, press
for 2 seconds under normal mode to start
logging. The
icon flashes to indicate
the logging status and LCD main display
shows the real time CO² measured value.
Lower display is the real time clock. (Fig. 19)
10
To terminate data logging, press
for
2 seconds, until
icon stops flashing.
NOTE:
The AQM4 will only record one session. If
is activated all previous data is erased.
Download logged data prior to starting
another
session.
AUTO POWER OFF
The meter turns off automatically after
20 minutes of inactivity. To override the
function, hold down
and
for
2 seconds to turn on the meter until "n"
appears. (Fig. 20)
NOTE:
AUTO SLEEP
FUNCTION WILL BE
DISABLED DURING
CALIBRATION MODE
SETUP
When the meter is off,
hold down
for
more than 1 second to
enter setup mode. (Fig
21) To exit setup, press
to return
to normal mode.
11
Press
or
to scroll through set-up
options from the following:
P10 - 99 Memory Clear
P20 - CO Alarm
P30 - Temperature Units
P40 - Logging Sample Rate
P50 - Pressure Compensation
P60 - Real Time Clock
P10: 99 MEMORIES CLEAR
P10 and "CLR" (Fig. 21) are displayed on the
LCD, press
to enter into P11 and clear
or keep all the manual records. The current
setting will be blinking on the LCD. (Fig. 22)
Press
or
to choose NO or YES
and press
to confirm.
-OR- Press
to escape and return to P10
P20: CO ALARM
When P20 and "ALAR" (Fig. 23) are
displayed on LCD, press
to enter into
P21 for setting CO alarm threshold. The
current set value will be blinking on the LCD
(Fig 24). Press
to increase or
to decrease the value. The selectable alarm
limits are 25~200ppm in 5 ppm increments.
When the preferred alarm value is set, press
to save the setting
-OR- Press
without saving and return
to P20.
12
P30 TEMPERATURE UNIT
When P30 and "UNIT" (Fig 25) are displayed
on the LCD, press
to go into P31 to
choose the temperature unit.
The set value will display on LCD (Fig 26)
Press
press
-OR- Press
P30.
or
to choose C° or F° and
to confirm.
to escape and return to
P40: LOGGING SAMPLING RATE
P40 allows you to set sampling rate of data
logging (Fig. 27). The range is from 1 second
to 4 hours 59 minutes and 59 seconds.
Press
to display current setting and
enter edit mode. The display is in the
format [HH. MM. SS.] The hour digits will
be flashing. To change intervals between
logged readings, press
to increase and
to decrease. Press
again to
confirm and enter minute setting. Press
to confirm and enter seconds setting.
(Fig 28) Press
to confirm the rate
setting.
-OR- Press
P40.
to escape and return to
13
P50 PRESSURE COMPENSATION
When P50 and "PRES" (Fig. 29) are displayed
on the LCD, press
to set pressure
compensation value for CO² measurement.
The current set will flash on LCD. (Fig. 30)
The barometric pressure unit is kPa.
Press
to increase or
to decrease
barometric pressure.
-OR- Press
to escape and return to P50.
NOTE: ONLY ENTER THIS MODE IF CURRENT
BAROMETER PRESSURE IS KNOWN. MULTIPLY IN.
Hg BY 3.39 TO OBTAIN kPa VALUE.
P60: REAL TIME CLOCK
Enter P60 for setting the real time clock of
this meter. Press
to enter into P61 to set
the time format as 12 hour or 24 hour. The
current set will flash on LCD. Press
or
to change the format and press
to confirm and continue to set the date
and time. (Fig 32)
-OR- Press
to escape and return to P60.
NOTE: DATE FORMAT IS YY:MM:DD.
The date will show on the lower display with
year digits blinking. Press
to increase or
to decrease digits. Press
to
confirm and continue to next setting. Repeat
above steps to complete the year/month/day/
hour/minute/second setting. (Fig. 32)
14
CALIBRATION MODE
The AQM4 allows you to calibrate CO² and
RH, for CO calibration please send unit to
UEi. To enter calibration mode, place unit
at suitable calibration site specified in the
following sections.
Press
+
, then also
simultaneously for 3 seconds to turn on the
meter and enter calibration mode (Fig. 33).
Press
or
to select parameter to
calibrate. To cancel or exit calibration at any
time, turn meter off.
NOTE:
ENSURE THE BATTERIES ARE AT FULL VOLTAGE
BEFORE THE CALIBRATION TO PREVENT
INTERRUPTION OR FAILED CALIBRATION.
CO² CALIBRATION
The manual calibration is suggested to
be done in sunny outdoor air that is well
ventilated. To begin, enter calibration mode.
Press
or
to select parameters
for calibration and press enter. The meter
is calibrated at standard 400ppm CO²
concentration at the factory. It is suggested
to manually calibrate regularly to maintain
good accuracy.
NOTE:
WHEN THE ACCURACY BECOMES A CONCERN,
RETURN TO UEi FOR STANDARD CALIBRATION.
CAUTION:
Do not calibrate the meter in the air with
unknown CO² concentration. It could be
calibrated as 400ppm by default which
leads to inaccurate measurements.
Wait 10 minutes until the blinking stops and
the calibration is completed. To cancel the
calibration, turn off the meter at any time.
15
RH CALIBRATION
To begin, enter calibration mode. Press
or
to select parameters for calibration
and press enter.
The meters default for calibration of
humidity is 33% and 75% salt solution. The
ambient condition is recommended at 70 ~
75°F (25°C) and stable humidity. To cancel
calibration, turn off the meter.
CAUTION:
Do not calibrate the humidity without
default calibration salts. Contact UEi for
calibration salt or for service
33% Calibration
Plug the sensor probe into 33% salt bottle.
Hold down
to enter 33% calibration.
"CAL" and calibrating value (32.8% if at
77°F) are blinking on the LCD.
75% Calibration
Plug sensor probe into 75% salt bottle and
enter calibration mode. In calibration mode,
press to select 75% calibration (Fig. 35),
press
to start. "CAL" calibrating value
(75.3% if at 77°F) will blink on the LCD.
Meter will begin calibration and finish in
60 minutes when "CAL" and humidity stop
blinking. To cancel the calibration, turn off
the meter at any time.
16
CO CALIBRATION
When the accuracy becomes a concern,
return to UEi for standard calibration. It
is necessary to have standard CO gas for
calibration.
CAUTION:
Do not calibrate the meter in the air with
unknown CO concentration. It could be
calibrated as 400ppm by default which
leads to inaccurate measurements.
TROUBLESHOOTING
Will Not Power On
- Press
for more than 3 seconds.
- Check that the adaptor is connected
and on.
- Check that battery level is sufficient and properly installed.
Readings Not Changing
- Check whether data hold function is activated (HOLD icon is at the left top).
Slow Response
- Check the air flow channels on
the rear. Verify no blockage exists.
Error Messages
EO1/E33: CO² sensor is out of order. Try new battery first.
E02: The value is under range.
E03: The value is over range
E04: The original data error results in this error (DP, WB)
17
Error Messages Cont.
E11: Retry humidity calibration
E16: Retry CO calibration
E31: Temperature sensor AD damaged
E32: Memory IC damaged.
E33: Humidity sensor or circuit damaged.
PC CONNECTION
The UEi AQM4 can be connected to a PC to
download recorded data.
Plug the USB cable into the socket at the
right side of the meter and the other port to
your PC. Next, install the software on your
PC following these procedures.
1. Insert the CD ROM and run installation. Select a preferred directory and click "Next" step by step to finish.
2. After the software installation is completed, it will run USB driver installation next.
18
AUTO CONNECT
Start the software and it will detect the
logger connection automatically, indicating
the COM port information at the bottom of
the main screen as well as the COM Port
setting column.
LOGGER SETTINGS
To set up logging plan, click "Setting" icon
and select "Logger". The setting page is
opened.
Users can set up the logger identifier
number. Click OK for setting and exit the
screen to confirm the settings.
19
DATA TRANSMISSION
To transmit auto recorded data from the
meter, click "Download" icon on the left top
side of the main screen. All auto-recorded
data in the logger will be transmitted. The
raw data with time stamp will display at
the lower part of the screen and the graph
in the middle.
In the Graph display, the Y-axis indicates
Temperature, RH, DP,WBT, CO2, and CO
levels in different line colors. The X-axis
can be switched to show Time or Recorded
Number Stamp.
20
VIEW MENU
The following functions help to view the
GRAPH data in more detailed way.
In the view menu, there are 4 tools to
enlarge the Graph data for detailed data
review.
Zoom in: Hold down "Ctrl" key on the PC
keyboard and left click any target point on
the graph to zoom in. Right click at any point
to zoom out.
Zoom Window: Hold down "Ctrl" key and
drag click the left button of the mouse to
select an area on the Graph and the selected
area will be enlarged.
Zoom X-Axis: Hold down "Ctrl" key and
drag click the left button of the mouse to
select an area on the Graph and the X-axis
of the selected area will be enlarged.
Zoom Y-Axis: Hold down "Ctrl" key and
drag click the left button of the mouse to
select an area on the Graph and the Y-axis
of the selected area will be enlarged.
Three icons on the right top side of the main
screen:
Redraw Button: After any review and
zooming on the Graph, click "Redraw" to
reset it to original format.
Clear Button: Click "Clear" to delete all data
and Graph on the window. A warning box
shows up for confirmation. Press "Yes" and
all data will be cleared from the PC.
21
Cursor Button: Switch cursor ON and it
shows the raw data with the cursor. Click
anywhere on the graph and the digital data
will be displayed. Switch OFF to disable the
function.
DATA PROCESSING
The downloaded data can be Saved or
Printed via "File" processing function.
Load: To retrieve saved files, just click
"Load" and select a desired file and it will
be loaded in the main screen with the file
details at the left top side.
22
SPECIFICATION
Measuring Range
CO²
0 ~ 9999ppm
CO
0 ~ 1000ppm
Temperature
-20 ~ 60˚C
-5 ~ 140˚F
Relative Humidity
0.1% ~ 99.9%
Dew Point Temp.
-20.0 ~ 59.9˚C
Wet Bulb Temp
-5.0 ~ 59.9˚C
Resolution
1ppm, 0.1˚C/˚F, 0.1%RH
Accuracy
CO²
±30ppm ± 5% of
reading (0 ~ 5000ppm)
CO
±10ppm for less than
100ppm
±10% of reading for
101~500ppm
±20% of reading for 501ppm
and above
Temperature
±0.6˚C/+0/9˚F
Relative Humidity
±3% (at 25˚C, 10~90%)
±5% (at 25˚C, other range)
Response Time
CO²
<30 seconds
(90% step change)
CO
<60 seconds
(90% step change)
Tair
<2 mins
(90% step change)
Relative Humidity
<10 mins
(90% step change)
LCD/Meter Size (mm)
26(H) x 44 (L),
205(L) x 70 (W) x 56(H)
Operating Condition
-20 to 50˚C (CO² Sensor)
0 to 500˚C (CO Sensor)
-20 to 60˚C
Storage Condition
-20 ~ 60˚C, 10 ~ 90% RH
Power Supply
AA x 4pcs or 9V Adaptor
Battery Life
>24 hours
(Alkaline Battery)
Weight
200g
23
CO² LEVELS AND GUIDELINES
REGULATORY EXPOSURE LIMIT
ASHRAE Standard 62.1-2004:
CO² concentration in occupied building
should not exceed 1000ppm.
Building Bulletin 101 (BB101): 1500ppm
UK standards for schools state that CO²
averaged over the whole day (i.e. 9am to
3:30pm) should not exceed 1500ppm.
OSHA: 5000ppm
Time weighted average over five 8-hour
work days should not exceed 5000ppm.
Mak: Germany, Japan, Australia, UK:
5000ppm
Eight hours weighted average in
occupational exposure limit is 5000ppm.
(See Ashrae 62.1-2004 Table B-1)
NON-ENFORCED REFERENCE LEVELS
NIOSH Recommends
250-350ppm: normal outdoor ambient
concentrations
600ppm: minimal air quality complaints
600 - 1000ppm: less clearly interpreted
1000ppm: indicates inadequate ventilation;
complaints such as headaches, fatigue, eye/
throat irritation will be more widespread.
1000ppm should be used as an maximum
limit for indoor levels.
24
CO LEVELS
ppm Symptoms and Applicable Standards
0-1
Normal background levels
9
Maximum indoor air quality level:
Maximum allowable concentration
per ASHRAE Residential Standards
62-1989 for living area.
25
Maximum limit 8 hours of continuous
exposure per California OSHA
workplace standards
35
Maximum 8 hours average exposure
level per US OSHA workplace
standards
50
Maximum concentration for
continuous exposure for any 8 hours
average level per OSHA standards
100
Evacuate employees from continuous
exposure in any 8 hour average level
per OSHA standards.
200
Mild headache, fatigue, nausea, and
dizziness within 2-3 hours
400
Frontal headache, life threatening
after 3 hours. Maximum
concentration in flue gas per the US
EPA and AGA standards
800
Dizziness, nausea, convulsions, death
within 2-3 hours
1600
Nausea within 20 minutes, death
within 2-3 hours.
25
CE CERTIFICATE
The product complies with EMC directive 2004/108/EC
Technical standard: Emission EN 61326-1:2006 Class B
EN 55011:2009/A1:2010 Group 1 Class B
Immunity EN 61326-1:2006 EN 61000-4-2:2009
EN 61000-4-3:2006 A2:2010
26
LIMITED WARRANTY
The AQM4 is warranted to be free from defects
in materials and workmanship for a period of one
year from the date of purchase. If within the
warranty period your instrument should become
inoperative from such defects, the unit will be
repaired or replaced at RXU option. This warranty
covers normal use and does not cover damage
which occurs in shipment or failure which results
from alteration, tampering, accident, misuse,
abuse, neglect or improper maintenance. Batteries
and consequential damage resulting from failed
batteries are not covered by warranty.
Any implied warranties, including but not limited
to implied warranties of merchantability and
fitness for a particular purpose, are limited to the
express warranty. CO2Meter, Inc. is not liable for loss
of use of the instrument or other incidental or
consequential damages, expenses, or economic
loss, or for any claim or claims for such damage,
expenses or economic loss. An RMA number
is required before warranty repairs will be rendered.
Instruments out of warranty will be repaired (when
repairable) for a service charge. Return the unit
postage paid and insured to:
CO2Meter.com
131 Business Center Drive
Ormond Beach, FL 32174
Support Call: (386) 256-4910
Email: Support@CO2Meter.com
Claims are not acceptable for improper use
(including adaptation) to particular applications
not foreseen in the instruction manual or improper
combination with incompatible accessories or
equipment, or for repair carried out by unauthorized
personnel.
This warranty gives you specific legal rights. You
may also have other rights which vary from state
to state.
27
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