User's Manual CFM Thermo Anemometer Air Velocity, Air Flow, and Temperature Model 407114 Introduction Congratulations on your purchase of the Extech CFM Thermo Anemometer. This instrument measures Air Velocity, Air Flow (volume) and Temperature. The RS-232 PC interface provides data acquisition functionality. Proper use of this meter will provide years of reliable service. 2 Model 407114 Version 2.0 November 2005 Specifications General Specifications Circuit Custom LSI microprocessor circuit Display Dual function 0.5" (13 mm) 4-digit LCD Measurement units Air Velocity: m/s, km/h, ft/min, knots, mph; 3 3 Air Flow: CMM (m /min); CFM (ft /min); Temp: °C & °F Data hold Freezes displayed reading Sampling rate 1 reading per second approx. Sensors Air velocity/flow sensor: Conventional angled vane arms with low-friction ball bearing. Temperature sensor: Precision thermistor MAX/MIN Memory Record and view Maximum and Minimum readings Automatic Power off Auto shut off after 15 minutes to preserve battery life Data Output RS 232 PC serial interface with 16-bit data stream Operating Temperature 32°F to 122°F (0°C to 50°C) Operating Humidity Max. 80% RH Power Supply 9V battery Power Current Approx. 8.3 mA DC Weight 0.84 lbs. (381g) including battery & probe Dimensions Main instrument: 7.1 x 2.8 x1.3" (180 x 72 x 32mm) Sensor Head: 72mm Diameter Range Specifications Air Velocity Range Resolution Accuracy (% rdg) m/s (meters per sec) 0.40 - 25.00 m/s 0.01 m/s ± (2% + 0.2 m/s) km/h (kilometers/hour) 1.4 - 90.0 km/h 0.1 km/h ± (2% + 0.8 km/hr) ft/min (feet per minute) 80 – 4921 ft/min 1 ft/min ± (2% + 40 ft/m) mph (miles per hour) 0.9 – 55.9 mph 0.1 mph ± (2% + 0.4 MPH) 0.8 to 48.6 knots 0.1 knots ± (2% + 0.4 knots) Range Resolution Area knots (nautical MPH) Air Flow 3 2 CMM (cubic meters/min) 0-999,900 m /min 0.001 to 100 0 to 9,999m CFM (cubic ft/min) 0-999,900 ft3/min 0.001 to 100 0 to 9,999ft Air Temperature Range Resolution Accuracy o 1.5 F (0.8 C) o o 32 - 122 F (0 - 50 C) 3 0.1 F/C o 2 o Model 407114 Version 2.0 November 2005 Meter Description 1. Sensor plug. Can be inserted in the sensor jack from only one direction. Ensure proper orientation before exerting force to plug in the sensor. 2. PC Interface jack (RS-232). For use with the interface cable provided in the optional 407001 PC Data Acquisition kit. 3. LCD Display for Air Velocity, Air Flow, and Temperature. Units of measure and user alerts are also displayed on the LCD. 4. Vane Sensor. Hold the sensor in the flow of air to initiate a reading. 5. Protective rubber holster. Must be removed to access the rear battery compartment. 6. Keypad (see below) • POWER Press to turn the meter ON or OFF • HOLD Press to freeze the displayed reading. Press again to unlock display • C/F Press to select the unit of measure for Temperature readings • RECORD/RECALL Used to store the highest, lowest, and average readings for later recall. Refer to the Operation section of this manual for more details. This button also functions as the DECIMAL point when programming. • UNIT Press to select the unit of measure for Air Velocity. This button also functions as the DOWN ARROW button when programming • FLOW/VELOCITY Press to select the mode of operation. In FLOW mode, the meter displays air volume. In VELOCITY mode, the meter displays air speed. • RIGHT Arrow button. Used when programming. • UP Arrow button. Used when programming. • FLOW MODE Press to select the Normal, AVG, or 2/3 MAX Air Flow operational mode. Refer to the Operation section of this manual for more details. • AVG/START In the FLOW mode, press to store a reading in the AVERGGE utility. Up to 20 readings can be averaged. Refer to the Operation section of this manual for more details. • ENTER/RESET Used in the Flow mode while entering the duct area. Refer to the Operation section of this manual. • AREA Used when manually entering the area of a duct. Refer to the Operation section of this manual. 7. Battery compartment located on the back of the instrument. The rubber protective jacket must be removed from the meter to access the compartment. 4 Model 407114 Version 2.0 November 2005 Operation Air Velocity Measurements 1. Connect the sensor to the sensor input jack on top of the meter. 2. Turn on the meter using the POWER button. 3. Select the VELOCITY function using the VEL/FLOW button. The LCD will display VEL when the velocity mode is selected. 4. Select the desired temperature units using the C/F select button. The LCD will reflect the current unit selection. yellow 5. Select the desired air velocity units using the UNIT dot button. The LCD will reflect the current unit selection. 6. Place the sensor in the air current with the yellow dot on the exhaust side of the vane (see diagram) airflow 7. View the air velocity and temperature readings on the LCD Display. The large main LCD display shows the Air Velocity reading. The lower LCD sub-display shows the temperature reading. Data Hold Feature 1. While taking measurements, press the HOLD button to freeze the LCD reading for later viewing. 2. The DH indicator will appear on the LCD when the display is in Data Hold mode. 3. Press HOLD again to return to normal operation. Maximum and Minimum Recording The 407114 allows the user to record and view the highest (MAX) and lowest (MIN) readings. 1. Press the RECORD/RECALL button once. The REC indicator will appear on the display and the meter will begin keeping track of the MAX and MIN values. 2. To view the MAX reading, press RECORD/RECALL again. The MAX indicator along with the maximum reading will appear on the LCD display. 3. Press RECORD/RECALL again to view the minimum value, the MIN indicator along with the minimum reading will appear on the LCD display. 4. To return to normal operation, press and hold the RECORD/RECALL button for approx. 3 seconds. The display indicators REC, MAX, and MIN will disappear. 5 Model 407114 Version 2.0 November 2005 Air Flow Measurements (CMM / CFM) 1. Connect the sensor to the sensor input jack on top of the meter. 2. Turn on the meter using the Power button. 3. Select the FLOW mode using the FLOW/VELOCITY button. The LCD will display FLOW when the Flow function has been properly selected. 4. Select the desired air flow units: CMM (cubic meters per minute) or CFM (cubic feet per minute) using the UNIT button. The LCD will reflect the selection. 2 2 5. Press the AREA button to begin entering the area in m or ft . Use the button to increment the flashing digit, use the button to decrement the flashing digit, use the button to select the next digit, and use the RECORD/RECALL button to set the decimal point. Press the ENTER/RESET button when the area has been entered. The bottom display (normally used for the temperature display) will indicate the area 2 2 entered in ft or m . The main LCD displays the air flow in CFM (cubic feet per minute) or CMM (cubic meters per minute). If the CFM or CMM reading exceeds 9999, use the displayed X10 or X100 multiplier to calculate the reading. 6. For Air Flow measurements, three modes apply: The normal (default mode) where the actual flow is indicated, and the two modes described below: Press the FLOW/MODE button to select one of the two modes listed below: 2/3V MAX MODE: LCD displays 2/3 the measured value. AVG MODE: Up to 20 readings can be taken separately and averaged. Select the AVG mode via the FLOW/MODE button and then press the AVG/START button to take a reading. Up to 20 readings can be taken and averaged. The lower LCD display provides a 1 to 20 counter and each time a reading is taken the counter is incremented. The main LCD displays the averaged air flow. 7. Note that the temperature function is not active in the Air Flow mode. Automatic Power OFF The Model 407114 turns off automatically after 15 minutes of operation. This feature was designed to conserve battery power. Note that when the meter is in the RECORD/RECALL mode, the Automatic Power OFF feature is disabled. Battery Replacement When LBT appears on the LCD, the 9V battery must be replaced. 1. Disconnect the sensor and the RS-232 PC Interface cable from the meter. 2. Remove the meter’s rubber protective jacket 3. Use a flat blade screwdriver or a coin to open the rear battery compartment 4. Replace the 9V battery 5. Close the battery compartment and replace the meter’s protective jacket RS-232 PC Interface The 407114 is equipped with a 3.5mm phono jack (meter top) for connection to a PC. To TM obtain the Model 407001 Windows data acquisition kit, contact Extech Instruments. The kit includes a cable that connects the meter to a PC. Instructions for use are provided with the 407001 kit. 6 Model 407114 Version 2.0 November 2005 Warranty EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects in parts and workmanship for one year from date of shipment (a six month limited warranty applies to sensors and cables). If it should become necessary to return the instrument for service during or beyond the warranty period, contact the Customer Service Department at (781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact information. A Return Authorization (RA) number must be issued before any product is returned to Extech. The sender is responsible for shipping charges, freight, insurance and proper packaging to prevent damage in transit. This warranty does not apply to defects resulting from action of the user such as misuse, improper wiring, operation outside of specification, improper maintenance or repair, or unauthorized modification. Extech specifically disclaims any implied warranties or merchantability or fitness for a specific purpose and will not be liable for any direct, indirect, incidental or consequential damages. Extech's total liability is limited to repair or replacement of the product. The warranty set forth above is inclusive and no other warranty, whether written or oral, is expressed or implied. Calibration and Repair Services Extech offers repair and calibration services for the products we sell. Extech also provides NIST certification for most products. Call the Customer Service Department for information on calibration services available for this product. Extech recommends that annual calibrations be performed to verify meter performance and accuracy. Support line (781) 890-7440 Technical support: Extension 200; E-mail: [email protected] Repair & Returns: Extension 210; E-mail: [email protected] Product specifications subject to change without notice For the latest version of this User’s Guide, Software updates, and other up-to-the-minute product information, visit our website: www.extech.com Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451 Copyright © 2005 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form. 7 Model 407114 Version 2.0 November 2005 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 x r2 = 3.14 and r2 = radius x radius Where Cubic equations CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2) CMM (m3/min) = Air Velocity (m/sec) x Area (m2) x 60 NOTE: Measurements made in inches must be converted to feet or meters before using the above formulae. Unit of Measure Conversion Table m/s ft/min knots km/h MPH 1 196.87 1.944 3.6 2.24 1 ft/min 0.00508 1 0.00987 0.01829 0.01138 1 knot 0.5144 101.27 1 1.8519 1.1523 1 km/h 0.2778 54.69 0.54 1 0.6222 1 MPH 0.4464 87.89 0.8679 1.6071 1 1 m/s 8 Model 407114 Version 2.0 November 2005