User's Manual

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Features and Benefits

Competitive Advantages

What's Included?

Recommended

Specifications

What is It?

How Does it Work?

Slide the AAV3 anemometer head onto any of our modular multimeters, instruments, handles or adapters to start taking air velocity measurements and temperature readings.  Remote it using a compatible meter with our detachable test leads.  The AAV3 measures air velocity and temperature and is used to quickly estimate CFM, check for duct blockages, and to quickly check the airflow balance of a conditioned space. While no anemometer can replace a hood for precision CFM measurements, the AAV3 does provide very accurate air velocity and temperature measurements.

Air velocity:

• Ft/min, meters/sec, MPH, KM/hr.
• Range: 80 to 5900 ft./min.
• Accuracy: +/-3%fs+1dgt.

• Displays ºF and ºC.
• Range: -4ºF to 140 ºF.
• Accuracy: +/-1ºF from 32ºF to 113ºF.
• Resolution: 0.5ºF.

How to Estimate CFM
Always use manufacturer’s specified free area calculations when estimating CFM.  Some free area calculations are listed as a percentage of the actual area with open diverter fins (example: Free Area = 0.75 x open grill area or 75% of the open grill).  Others are listed in square inches or feet (U.S.).  If manufacturer’s specifications are not available, you can roughly estimate free area using the formula below.  

length x height (of open grill area) = rough free area

Example:
In the diagram to the right, let’s say the whole register is 11 inches x 6 inches.  To roughly calculate the free area, you take the length and height of the open area of the grill.  In this case we’ll assume the open grill is 9 inches in length and 4 inches high.

The only problem is if we multiply inches times inches we get square inches.  We need to convert the free area measurement into feet in order to get cubic feet per minute.

In our example, the rough free area is:

9 in. x 4 in. = 36 in.2 (or 36 square inches).

Simply divide each measurement by 12 inches (1 foot) to convert the measurement into feet.  The equation looks like this:

(9 in / 12 in) x (4 in / 12 in) = 36 in2 / 144 in2   

Simply put, if have you free area in square inches divide by 144 to get square feet.

Let’s not get into the algebra that takes place here and assume we know how the units cancel out to get feet.  If you have a calculator, it’s really easy to do on the fly.  Divide 9 by 12 to get .75 ft.  Divide 4 by 12 to get .3333 ft. Multiply them together and you have your rough free area in square feet (ft2).

The above equation looks like this when you do the math on the fly:

.75 ft  x  .3333 ft  =  .249975 ft2     

Now that you have your rough free area in square feet, you can use it to estimate CFM.

Estimated CFM = v (air velocity in ft/min - the reading off you meter) x a (rough free area in ft2)

Using the picture (air velocity of 600 ft/min) and our rough free area from the calculations above the equation looks like this:
 

Estimated CFM = 600 ft/min x .249975 ft2

Estimated CFM = 149.985 ft3 / min    

While it might seem complicated, it’s really not that hard to get a rough estimate of CFM.  Anemometers are great for doing quick checks on the balance of a system using estimated CFM or straight up airflow measurements, and are usually adequate for most residential applications assuming room and register sizes are pretty uniform.

Features and Benefits

• Works with any Fieldpiece expandable instrument or handle or any DMM with mVDC ranges and our detachable leads.
• Measures air velocity and measures air temperature.
• Measure in hard to reach areas using detachable test leads.
• Display readings smoothly in average mode or switch to real-time measurement.
• Low battery indicator.
• Auto-power off after 10 minutes (may be disabled).

Competitive Advantages

• Intuitive interface. Attach the head. Set it to temperature or air velocity and start testing.
• Sensors maintain accuracy over time. (see Specifications below)
• Optional AOXP2 hand pump works much better in cold weather than most electronic pumps.

Recommended Accessories and Replacement Parts

Technicians who like the AAV3 may also enjoy these instruments and accessories:

Specifications

TECHNICAL SPECIFICATIONS
Range (wind velocity): 60-5900 Ft/min, 0.7-67.0
mph, 0.3-30.0 M/s, 1-108 KM/hr
Accuracy (wind velocity): ±3% + 1digit @
73ºF±5ºF (23°C±2°C), <95% relative humidity

Range (temperature): -20ºC to 60ºC, -4ºF to 140ºF
Accuracy (temperature):
±1ºF at 32ºF to 113ºF;
±2ºF at -4ºF to 32ºF, 113ºF to 140ºF
(±0.5ºC at 0ºC to 45ºC;
±1ºC at -20ºC to 0ºC, 45ºC to 60ºC)

Resolution: ±0.1ºF/C
Operating temperature: 32 to 120 ºF (0-49°C)
Operating relative humidity: <95%RH
Storage temperature: -4 to 140ºF (-20 to 60°C),
0 to 80% R.H. with battery removed from meter.
Sensor type: Thermistor temperature sensor
Battery life: 200 hours typical. No measurable
current draw when in "off" position.
Low battery indication: Red LED
Battery: 9V
Auto off: Approx. 10 minutes

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Display: 3 1/2 digit liquid crystal display (LCD) with maximum reading of 1999. 

Overrange: (OL) or (-OL) is displayed.

Low battery indication: The battery symbol is displayed when the battery voltage drops below the operating level.

Measurement rate: 2.5 times per second, nominal.

Operating Environment: 0°C to 40°C at < 70% relative humidity.

Storage Temperature: -20°C to 60°C, 0 to 80% R.H. with battery removed from meter.

Auto power off: 15 seconds approx.

Standby consume current: <10μA

Battery: 4 pcs 1.5V (AAA size) UM-4 R03. 

Battery Life: 4 hours (continuity) typical with alkaline battery (@20ÌÙ range test 10ÌÙ resistor). 

Dimensions: 170mm(H) x 44mm(W) x 40mm(D). 

Weight: 160g including batteries.

 

ELECTRICAL

Range: 20MW, 2000 MW.

Resolution: 10K W on 20MW range, 1 MW on 2000 MW range.

Accuracy:

20 MW range: ±(2%rdg + 2dgts)

2000 MW range: <500ÌÙ ±(4%rdg + 2dgts)

>500 MW ±(5%rdg + 2dgts)

Rated voltage: DC-DC converter to 1000VDC

Accuracy temperature: 23°C ± 5°C less than 70%RH

Temperature Coefficient: 0.1X (specified accuracy)/°C (28°C)