USER GUIDE Heavy Duty CFM-CMM Thermo-Anemometer With built-in non-contact IR Thermometer and Laser Pointer Model HD300
Introduction Congratulations on your purchase of the Extech HD300 CFM Thermo-Anemometer. This handheld meter measures and displays air velocity, air flow (volume), temperature of air, and surface temperature (using the built-in non-contact IR thermometer). This meter is shipped fully tested and calibrated and, with proper use, will provide years of reliable service.
Meter Description 1. LED display for Air Velocity, Air Flow, Probe Temperature, and remote surface temperature. Units of measurement and user alerts are also displayed on the LCD. 2. Vane Sensor. Hold the sensor in the flow of air to take a reading. 3. IR sensor: Non-contact temperature measurement for remote surfaces. 4. Laser Pointer: Helps the user aim the IR sensor. 5. Battery access: Cover on rear panel 6. PC interface jack: Use the supplied cable to connect meter to a PC 7.
Operation Side view of Vane Air Velocity Measurements 1. Connect the sensor to the sensor input jack on top of the meter. 2. Turn ON the meter using the on-off 3. Select the VELOCITY function using the UNITS button. Press the button repeatedly until the LCD displays VEL. 4. Press and hold the UNITS button for 2 seconds (until two tones are heard) to change the temperature units from °C to °F or from °F to °C. The LCD will reflect the selection. 5.
Non-contact IR Surface Temperature Measurements The built-in IR sensor can remotely measure the temperature of just about any surface. The Laser pointer allows the user to aim accurately when taking remote measurements. button. 1. Turn ON the meter using the on-off 2. The IR sensor is located at the top of the meter. 3. Point the sensor toward the surface to be measured. 4. Press and hold the IRT button to begin measuring the surface temperature of a desired target.
MIN-MAX-AVG Recording Modes The HD300 has several MIN-MAX-AVG modes described separately below. MIN-MAX-AVG functions are available for all measurements made with the vane sensor (air velocity, air flow, and air temperature). Continuous Moving Average In the Continuous Moving Average mode the meter displays the continuous average of the measured readings for up to a 10 hour period. 1. Turn the meter ON. 2. Place the sensor in the air stream. 3.
Battery Replacement When the battery icon appears on the LCD, the 9V battery must be replaced. 1. The battery compartment is located on the rear of the meter. 2. Press in and down on the arrow located above the tilt stand hinge. 3.
IR Theory IR thermometers measure the surface temperature of an object. The meter’s optics sense emitted, reflected, & transmitted energy that is collected and focused onto the meter’s detector. The meter’s circuitry translates this information into an LCD reading. InfraRed Measurement Considerations When taking IR measurements the meter automatically compensates for ambient temperature changes. Note that it may take up to 30 minutes to adjust to extremely wide ambient changes.
Thermal Emissivity Table for Common Materials Material Emissivity Material Emissivity Asphalt 0.90 to 0.98 Cloth (black) 0.98 Concrete 0.94 Human skin 0.98 Cement 0.96 Leather 0.75 to 0.80 Sand 0.90 Charcoal (powder) 0.96 Earth 0.92 to 0.96 Lacquer 0.80 to 0.95 Water 0.67 Lacquer (matt) 0.97 Ice 0.96 to 0.98 Rubber (black) 0.94 Snow 0.83 Plastic 0.85 to 0.95 Glass 0.85 to 1.00 Timber 0.90 Ceramic 0.90 to 0.94 Paper 0.70 to 0.94 Marble 0.94 Chromium oxides 0.
Useful Equations and Conversions AREA equation for rectangular or square ducts Height (H) Area (A) = Width (W) x Height (H) Width (W) Area equation for circular ducts Area (A) = Radius Where x r2 = 3.14 and r2 = radius x radius Cubic equations 3 2 CFM (ft /min) = Air Velocity (ft/min) x Area (ft ) 3 2 CMM (m /min) = Air Velocity (m/sec) x Area (m ) x 60 NOTE: Measurements made in inches must be converted to feet or meters before using the above formulae.
Specifications General Specifications Display Measurements Dual Display Multi-function LCD with 9999 counts Air Velocity: m/s, km/h, ft/min, knots, mph; 3 3 Air Flow: CMM (m /min) and CFM (ft /min); Air Temperature (through vane) and Surface Temperature (using the IR thermometer function): °C and °F Data Hold Freezes displayed reading Sampling rate 1 reading per second Sensors Air velocity/Air flow sensor: Conventional angled vane arms with lowfriction ball bearing.
Range Specifications Air Velocity Measurements Range Resolution Accuracy (%rdg) m/s (meters per second) 0.40 – 30.00 m/s 0.01 m/s ± (3% + 0.20m/s) km/h (kilometers per hour) 1.4 – 108.0 km/h 0.1 km/h ± (3% + 0.8km/h) ft/min (feet per minute) 80 – 5900 ft/min 1 ft/min ± (3% + 40ft/min) mph (miles per hour) 0.9 – 67.0 mph 0.1 mph ± (3% + 0.4m/h) 0.8 to 58.0 knots 0.1 knots ± (3% + 0.4knots) Range Resolution Area 3 0.001 0 to 999.
