User`s Manual CFM Thermo Anemometer Model
Contents
1. CFM ft3 min Air Velocity ft min x Area ft 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 Unit of Measure Conversion Table m s ft min knots km h MPH 1 ft min cose f 1 ooer 0 01829 0 01138 wa osu mar 1 tose a 1 km h 0 54 0 6222 1 MPH 0 4464 87 89 0 8679 1 6071 1 8 407114 V1 7 04 032. Battery Replacement When the LBT icon appears on the LCD the 9V battery must be replaced 1 Remove the rubber holster that surrounds the entire meter 2 Slide off the rear battery compartment 3 4 Affix the battery compartment cover and the meter holster Replace the 9V battery RS 232 PC Interface The 407114 is equipped with a 3 5mm phone jack meter top for connection to a PC for data acquisition purposes To obtain PC interface cabling and Windows data acquisition software contact Extech Instruments Instructions for use are provided with the data acquisition software hardware kits 6 407114 V1 7 04 03 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 on 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 at www extech com click on Contact Extech and go to Service Department to request an RA number 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
3. feet per minute 80 4921 ft min 2 20 ft min mph miles per hour 0 9 55 9 mph 0 1 mph 2 0 2 mph knots nautical miles per 0 8 to 48 6 knots 0 1 knots 2 0 2 knots hour CMM cubic meters per 0 999 900 m min 0 001 to 0 to 9 999m minute 100 CFM cubic feet per 0 999 900 ft min 0 001 to 0 to 9 999ft minute 100 L 82 122 F 0 50 C 0 1 CFIC 1 5 F 0 8 C 2 407114 V1 7 04 03 Meter Description 1 LCD Display 2 Keypad 3 Sensor 4 Sensor Input 5 RS 232 PC Interface jack oma ve Anemometer 6 Protective rubber holster 7 Battery compartment rear Note To access the rear battery compartment first remove the meter s rubber protective holster 3 407114 V1 7 04 03 Operation Air Velocity Measurements 1 2 3 Connect the sensor to the sensor input jack on top of the meter Turn on the meter using the Power button Select the VELOCITY function using the VEL FLOW button The LCD will display VEL when the velocity mode is selected Select the desired temperature units using the C F select button The LCD will reflect the current unit selection Select the desired air velocity units using the UNIT button The LCD will reflect the current unit selection For maximum accuracy the airflow must enter Side view of Vane the vane on the side without the yellow dot yellow see diagram dot DO pam airflow View the air velocity and temperature reading
4. air flow units CMM cubic meters per minute or CFM cubic feet per minute using the UNIT button The LCD will reflect the selection Press the AREA button to begin entering the area in m or ft Use the amp button to increment the flashing digit use the Y 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 entered in ft or m The main LCD displays the air flow in CFM cubic feet per minute or CMM cubic meters per minute Refer to the Area Equations in the back of this manual 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 Note that the temperature function is not active in the AIR FLOW mode 5 407114 V1 7 04 03
5. 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 T Support Hotline 781 890 7440 Tech support Ext 200 Email support extech com Repair Returns Ext 210 Email repair extech com Website www extech com Copyright 2003 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 7 407114 V1 7 04 03 Useful Equations and Conversions Area equation for rectangular or square ducts Width W Area A Width W x Height H Area equation for circular ducts Cubic equations Area A x r Where 3 14 and r radius x radius
6. User s Manual EXT INSTRUMENTS CFM Thermo Anemometer Air Velocity Air Flow and Temperature Model 407114 i FLOW MODE I AVG START ENTER RESET AREA I i I CFM hore 407114 Introduction Congratulations on your purchase of the Extech CFM Thermo Anemometer This meter measures Air Velocity Air Flow and Temperature An RS 232 PC interface provides data acquisition functionality Proper use of this meter will provide years of reliable service Specifications Custom LSI microprocessor circuit Display Dual function 0 5 13 mm 4 digit 9999 count LCD Measurement units Air Velocity m s km h ft min knots mph Air Flow CMM m min and CFM ft min Temp C and F Data hold Freezes displayed reading Sampling rate 1 second approx Sensors Air velocity flow sensor Conventional angled vane arms with low friction ball bearing Temp 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 output Operating Temperature 32 F to 122 F 0 C to 50 C ine Dimensions Main instrument 7 1 x 2 8 x1 3 180 x 72 x 32mm Sensor Head 2 8 72mm diameter Air Velocity Accuracy rdg m s meters per sec 0 4 to 25 00 m s 0 01 m s 2 0 2 m s km h kilometers per 1 4 to 90 0 km h 0 14 km h 2 0 2 km hr hour ft min
7. s on the LCD Display The large main LCD display shows the Air Velocity reading The lower LCD sub display shows the temperature reading lt Data Hold Feature 1 3 While taking measurements press the HOLD button to freeze the LCD reading for later viewing The DH indicator will appear on the LCD when the display is in Data Hold mode 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 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 To view the MAX reading press RECORD RECALL again The MAX indicator along with the maximum reading will appear on the LCD display Press RECORD RECALL again to view the minimum value the MIN indicator along with the minimum reading will appear on the LCD display 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 4 407114 V1 7 04 03 Air Flow Measurements CMM CFM 1 2 3 Connect the sensor to the sensor input jack on top of the meter Turn on the meter using the Power button Select the FLOW mode using the FLOW VELOCITY button The LCD will display FLOW when the flow function has been properly selected Select the desired
Download Pdf Manuals
Related Search