Dwyer Instruments AQH-20 Specifications-Installation And Operating Instructions

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 measurement is shown in top display
2
Air temperature dew point or wet bulb temperature is shown in lower left display
Humidity measurement is shown in lower right display
NOTICE When Model AQH-20 experiences a large variation in
environment the meter may take 30 seconds to respond
Press the button for at least one second to activate backlight Do the same
MODE
to turn off the backlight
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
Model AQH-20 Handheld Indoor Air Quality Meter
Specifications - Installation and Operating Instructions
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S T MODE
CAL
DP/W T
Esc
M A N
HOLD X

SPECIFICATIONS

Measurement Ranges:
CO 0 to 2000 ppm
2
Temperature 14 to 140°F (-10 to 60°C)
Relative Humidity 0 0 to 99 9% RH
Accuracy:
CO ±30 ppm ±5% of reading
2
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 1 ppm
2
Temperature 0 1°F (0 1°C)
Humidity 0 1% RH
Response Time:
CO < 30 seconds
2
Temperature < 2 minutes
Humidity <10 minutes
Display: Four digits for temperature/CO
CO Sensor: Non-dispersive infrared
2
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
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 Alarm Set Point
2
Hold down for more than one second during normal mode
When "Al" and "P1 0" are displayed on the LCD press the
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
MODE
button to decrease the value
DP/WBT
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and 3 digits for humidity
2
button to cycle between air
DP/WBT
button to enter
N
M AV
X
button to increase the value and press the