Features and Benefits
What is It?
The AAV3 is an anemometer accessory head for use with our modular instruments that measures air velocity and temperature in English or Metric units: Ft/min, M/s, MPH, KM/hr, ºF (degrees Fahrenheit) or ºC (degrees Celsius). Multiply your air velocity by the register’s free area to estimate CFM or diagnose duct blockages and quickly check the airflow balance in a conditioned space. Use with our DL3 Data Logger to track airflow or temperature over time. Features average and real time testing modes.
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.
- 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
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
The AAV3 Anemometer Air Velocity and Temperature Accessory offers several features and benefits to field technicians:
- 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).
Besides the advantages outlined in Features and Benefits in the section above, the AAV3 offers additional advantages to field service technicians.
- 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.
- Air Velocity and Temperature Accessory - AAV3
- 9V Alkaline Battery (installed)
- Operator’s manual
Recommended Accessories and Replacement Parts
Technicians who like the AAV3 may also enjoy these instruments and accessories:
Expandable True RMS Stick Multimeter with Backlight - HS36
Our top of the line True RMS Stick Meter, the HS36 includes the ranges you use everyday for HVAC/R field service plus includes a bright blue backlight and True RMS. Like the rest of the HS30 series, the HS36 comes equipped with a magnetic hanger, along with detachable silicone test leads and alligator clip probe tips for remote and easy one-handed testing, as well as the full set of built-in safety features. This auto-ranging stick meter also includes a bar graph on the LCD for an analog feel. Technicians who prefer our expandable stick meters tell us this is the best digital multimeter for HVAC/R field Service.
Expandable HVAC/R Data Logger - DL3
The DL3 Data Logger from Fieldpiece Instruments measures and records any parameter from any accessory head Instrument we offer. It holds up to 20,000 data points and can be set to record in a range from once every second to once ever 999 hours. Record and export data in .xls format to your PC for use in work orders, troubleshooting and service contracts. A real-time clock time stamps every data point for pinpoint accuracy. Use multiple data loggers to monitor several parameters to make troubleshooting and commissioning easier. We've updated the function of the DL3 to include features you asked us to add. Combined with our accessory head instruments, we’re comfortable saying the DL3 is the most versatile data logger for HVAC/R field service.
|Accessory Handle Adapter - AHDL1
The AHDL1 Accessory Handle Adapter plugs into any DMM with industry standard jacks, allowing you to quickly connect any of our accessory head instruments for testing. Using your multimeter with 100’s and 1,000’s mVDC ranges, attach the adapter and head to measure even more HVAC/R parameters.
Deluxe Meter Case - ANC1
The Deluxe Meter Case, model ANC1, easily holds 1 meter and 2 accessory head instruments. Features include rugged nylon construction, padding, durable pockets inside and out, a rugged double zipper and a shoulder strap. The ANC1 comes standard with our HS30 Series Stick Multimeters.
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
±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)
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
Auto off: Approx. 10 minutes