UEi AQM4 User Manual
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INSTRUCTION MANUAL
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AQM4
Indoor Air Quality Meter
1-800-547-5740 • Fax: (503) 643-6322
Email: info@ueitest.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.
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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
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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 LCD Real 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.
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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.
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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.
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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.
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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
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