Finally, a hand held unit that measures everything you need to know on a job site. The Kestrel 4100 is the new revolution in HVAC monitoring.

·  Features

• Air flow in cfm, L/s, m³/s, m³/m, m³/h
• Air Velocity in ft/m, mph, m/s, km/h, kts, Beaufort
• Temperature in °F or °C
• Humidity in %
• Additional measurements of dewpoint, wind chill and heat stress index
• Data Logger (automatic and manual)
• Minimum, Maximum and Average values
• Multi-Function 3-line display
• Impeller can be replaced without tools
• Humidity sensor can be recalibrated in the field with our Relative Humidity Calibration Kit.
• Graphical Display for logged values
• Upload to a computer (with optional interface)
• Backlight for low light conditions
• Includes neck and wrist lanyards, protective pouch and
• 2 AAA batteries
• 2-year warranty
• Assembled in the USA
• US Patent Nos. 5,783,753 and 5,939,645 and 6,257,074

Specifications

Air Velocity

• Accuracy ±3%
• Response Time 1 second
• Calibration Drift <2% after 100 hours use at 7m/s
• Units Display Resolution Range
• Knots KTS 0.1 0.6 to 78
• Meters per Second M/S 0.1 0.3 to 40
• Kilometers per Hour KM/H 0.1 1.0 to 144
• Miles per Hour MPH 0.1 0.7 to 89
• Feet per Minute FPM 1 59 to 7877
• Beaufort Force BEAU 1 1 to 16

Air Flow

• Accuracy ±3%
• Response Time 1 second
• Calibration Drift <2% after 100 hours use at 7m/s
• Units Display Resolution Range
• Cubic Feet per Minute cfm 1 0 to 99,999
• Liters per Second L/s 1 0 to 99,999
• Cubic Meters per Second m³/s 1 0 to 99,999
• Cubic Meters per Minute m³/m 1 0 to 99,999
• Cubic Meters per Hour m³/h 1 0 to 99,999

Temperature

• Accuracy
• Temperature ±1°C
• Wind Chill ±1°C
• Dew Point ±2°C
• Heat Index ±3°C
• Response Time approximately 1 minute for most conditions
• Units Display Resolution Range
• Celsius °C 0.1 -29 to 70
• Fahrenheit °F 0.1 -20 to 158

Relative Humidity

• Accuracy ±3%
• Response Time approximately 1 minute for most conditions
• Calibration Drift ±2% over 24 months (can be field calibrated)
• Units Display Resolution Range Percent % 0.1 5 to 95%

Display

• Update 1 second
• Temperature Range Normal operation from -20°C to 60°C [-4°F to 140°F]. Below -20°C [-4°F], accurate readings may be taken by keeping the unit warmer than -20°C [-4°F] and exposing it for the minimum time necessary to take a reading (less than 1 minute).
• Storage Temperature -30°C to 60°C [-22°F to 140°F]. Auto Shutdown After 15 minutes of no button presses. (This feature can be disabled.)

Physical

• Battery Two AAA alkaline batteries (included). Typical life, 400 hours.
• Impeller 25 mm. [1in.] diameter, sapphire bearings, light weight. User-replaceable impeller/housing assembly.
• Temperature Sensor Hermetically sealed precision thermistor.
• Humidity Sensor Solid state silicon capacitive sensor.
• Dimensions 12.7 x 4.5 x 2.8 cm. [5 x 1.8 x 1.1 in.]
• Weight 102 g. [3.6 oz.]