The Model AQH-20 Indoor Air Quality Meter
reduces the number of instruments
a contractor has to carry by measuring the carbon dioxide concentration air
temperature and humidity in one device A large backlit LCD display shows all
three parameters simultaneously The Model AQH-20 can display dew point or wet
bulb temperatures in place of the ambient temperature Minimum maximum and
average readings are easily accessible through the function buttons By pressing
the hold key the current values are held so that they can be recorded An audible
alarm warns the user that the current ambient conditions are becoming hazardous
The Model AQH-20 includes a hard carrying case and four AA alkaline batteries
OPERATING INSTRUCTIONS
Taking Measurements
Press the
button to turn the meter on The meter takes 30 seconds to warm up
before displaying the current reading
CO
2
measurement is shown in top display
Air temperature dew point or wet bulb temperature is shown in lower left display
Humidity measurement is shown in lower right display
Press the
button for at least one second to activate backlight Do the same
to turn off the backlight
Model AQH-20 Handheld Indoor Air Quality Meter
Specifications - Installation and Operating Instructions
Bulletin ES-AQH-1
SPECIFICATIONS
Measurement Ranges:
CO
2
0 to 2000 ppm
Temperature 14 to 140°F (-10 to 60°C)
Relative Humidity 0 0 to 99 9% RH
Accuracy:
CO
2
±30 ppm ±5% of reading
Temperature ±0 9°F (±0 6°C)
Humidity ±3% RH (10 to 90%) ±5% (0 0 to 9 9% or 90 to 99 9%)
Resolution:
CO
2
1 ppm
Temperature 0 1°F (0 1°C)
Humidity 0 1% RH
Response Time:
CO
2
< 30 seconds
Temperature < 2 minutes
Humidity <10 minutes
Display:
Four digits for temperature/CO
2
and 3 digits for humidity
CO
2
Sensor:
Non-dispersive infrared
Operating Temperature:
32 to 122°F (0 to 50°C)
Operating Humidity (Non-Condensing):
0 to 95% RH
Power Requirements:
(4) 1 5 V AA alkaline batteries included user replaceable
Warm Up Time:
30 seconds
Weight:
6 76 oz (200 g)
Agency Approval:
CE
Selection of Temperature Parameter
The Model AQH-20 can display ambient air temperature dew point temperature
or the wet bulb temperature Press the
button to cycle between air
temperature dew point temperature and wet bulb temperature The temperature
and measurement type will be displayed in the lower left corner of the display
Changing the CO
2
Alarm Set Point
Hold down
for more than one second during normal mode
When “Al” and “P1 0” are displayed on the LCD press the
button to enter
alarm setup mode
The current alarm value will be blinking on the LCD “Al and P1 0” will be displayed
on the bottom displays Press the
button to increase the value and press the
button to decrease the value
81/4
[209.44]
63/4
[171.34]
RS
23
2
DC
9V
S T
HOLD
CAL
Esc
M A
MODE
DP/W T
N
X
211/64
[55.07]
15/16
[33.36]
MODE
DP/WBT
M AV
N
X
DP/WBT
MODE
When Model AQH-20 experiences a large variation in
environment the meter may take 30 seconds to respond
NOTICE
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176