Perfect Prime WD9829 User manual

Hot Wire Anemometer
User’s Manual
WD9829

Description of product
This Hot Wire Anemometer is a kind of sophisticated and precise instrument. It will lead you
make a new step in the field of precision measurement. Its high precise and sensitive probe will
make your measurement more convenient.
Features
1. Hot Wire Anemometer, available for low air velocity measurement.
2. Slim probe, ideal for grilles & narrow space.
3. Combination of hot wire and standard thermistor, deliver rapid and precise measurements even
in a very low air velocity.
4. Records maximum/minimum readings with recall & data hold.
5. Microprocessor circuit assures maximum possible accuracy, provides special functions and
features.
6. Super large LCD display with backlight, reading the air velocity, air quantity & temp, at the
same time.
7. Multi-functions for air quantity measurement: m/s, km/h, ft/min, MPH, Knots & build in
Volume CFM/CMM
8. Build-in thermistor sensor for temperature measurement, fast response for thermal measurement.
Built in °C/℉.
Technical Specification
Display
43mm X 57mm large LCD display
Dual functions display
Measurement
m/s (meter/second)
km/h (kilometer/hour)
ft/min (feet/minute)
MPH (mile/minute)
Knots (nautical miles per hour)
°C/℉(temperature)
Data hold (data holding function)
Sampling rate
About 0.8S
Operating temperature
0〜50°C(32〜122℉)
Operating humidity
Less than 80%RH
Power supply
Build-in 3.7V re-chargeable lithium battery
Weight
240g (Host computer)
Size
200mm X 85mm X 38mm
Accessory
Hot wire sensor and adapter

Measurement Parameters
Air Velocity Measurement
Measurement
Range
Resolution
Accuracy
m/s
0.1〜25.0m/s
0.01 m/s
±(5%+1d) of reading or
±(1%+1d) of full range
km/h
0.3〜90.0km/h
0.1 km/h
ft/min
20〜4921ft/min
1 ft/min
MPH
0.2〜55.9 MPH
0.1MPH
Knots
0.2〜48.5knots
0.1 knots
Air Velocity Unit
m/s-meter per second km/h-kilometers per hour
ft/min-feet per minute MPH-miles per hour
Knots-nautical miles per hour
Temperature measurement
Range
0℃to 50℃(32℉to 122℉)
Resolution
0.1°C/0.1℉
Accuracy
±1°C/1.8℉
Volume Range
Volume unit
Range
Resolution
CFM
0-999900ft3/min
0.001 to 100
CMM
0-999900m3/min
0.001 to 100
CFM: cube feet per minute
CMM: cube meter per minute
Key
1. On/ off key
2. Data holding
3. Switch air quantity/temperature display
4. Switch max/min measurement modes
5. Short press to turn on/off backlight, long press to enter setting mode
6. In normal measurement status, switch air quantity/temperature unit; in area setting mode,
decrease input value
7. In normal measurement status, switch air velocity unit; in area setting mode, increase input
value

Screen Display
1. Battery level indicator
2. Main display: wind speed value
3. Wind speed unit
4. Measurement type
5. Lower display: air quantity, temperature.
6. Max/Min display
7. Multiples display
8. Air quantity display
9. Temperature unit
10. Area unit
11. Auto power off symbol
12. Data holding
13. Setting model symbol
14. Wind speed measurement
Setting Function
In the measurement interface, long press the SETUP key to enter the setting mode, the following
operations can be conducted. After the completion, long press the SETUP key once again to save
and exit.
Select area unit:
While enter the area setting model shown in the Fig.1, Press ▲ to choose the area unit you want,
ft2or m2.
Enter the area of air duct:
After entering the setting mode, press the SETUP key to enter the interface shown in Fig. 2, press
the ▲/▼ keys to adjust the value (long press for quick add/subtract), press the S/T key to move
decimal point.
Turn on/off the auto power off function:
After entering the setting mode, press the SETUP key twice to enter the interface shown in the Fig.
3, press the ▲ key to select ON/OFF.
If the automatic shutdown function is turned on, the meter will be automatically shut down after
20 minutes.

Figure 1 Figure 2 Figure3
Air Quantity Calculation Formula
Area calculation formula for rectangular or square ducts:
Height (H)
Width (W)
Area = width x height
Area calculation formula for round ducts:
Radius r
Area = π×r2
CFM (ft3/min) = wind speed (ft/min)×area (ft2)
CMM (m3/min) = wind speed (m/sec) x area (m2) x 60

Operations
1. Insert the probe to the probe socket.
2. Press power off key to turn on the meter, screen enters the measurement interface after 8
seconds countdown.
3. Choose the wind speed unit and temperature unit.
4. Zeroing operation: Slide to close the sensor cover; press “Hold” key for 2 seconds until the
screen displays four zeros, zeroing operation is completed.
5. Open the sensor cover, adjust the sensor handle to the right length and let the sensor exposed
in the air.
6. Direction of the sensor. The direction sign on the top of the "sensor" should face to the
measuring wind direction. Then the main screen displays the wind speed value, the lower
screen displays the temperature or air quantity value.
7. MAX / MIN measurement: in the measurement interface, short press MAX key to switch the
MAX / MIN measurement modes. The instrument always displays the measured maximum
or minimum value. Long press the MAX key to exit.
Application:
Environmental measurement, air conveyors, flow hoods, clean rooms, air velocity, air balancing,
fans/motors/blowers, furnace velocity, refrigerated case, paint spray booths, etc.
Charging
The product has built-in chargeable lithium battery. When the
screen displays low battery, please charge the product in time
with use of the attached power adaptor.