User`s Manual Hygro Thermo-Anemometer
Contents
1. Copyright 2003 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 6 Model 407412 May 2003 Rev 1 9 Appendix 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 CFM ft min Air Velocity ft min x Area ft CMM m3 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 km h 0 54 0 6222 1MPH 0 4464 87 89 0 8679 1 6071 1 7 Model 407412 May 2003 Rev 1 92. User s Manual EXTECH INSTRUMENTS Hygro Thermo Anemometer Model 407412 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 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 Introduction Congratulations on your purch
3. ase of Extech s Hygro Thermo Anemometer This Heavy Duty meter measures and displays Air Velocity Temperature and Relative Humidity Temperature Air flow can be displayed in the following units of measure feet per minute meters per second miles per hour kilometers per hour and knots Temperature and RH units are displayed in C F and units respectively Careful use of this meter will provide years of reliable service Specifications General Specifications Display Dual function 4 digit 9999 count LCD display Units of measure m s meters per second km hr kilometers per hour ft min feet per minute knots nautical miles per hour mile hr miles per hour Temperature C F Humidity RH Data hold Holds reading on the LCD display when button is pressed Sensors Air velocity sensor Twisted vane arm with low friction ball bearing Temperature Precision thermistor Humidity Thin film capacitor Dimensions Meter 7 1x2 8x1 3 180 x 72 x 32mm Anemometer Probe 0 7 17mm Diameter x 6 7 170mm Anemometer temperature and RH Probes 9V battery amp case 2 Model 407412 May 2003 Rev 1 9 Range Specifications Air velocity Measurement Accuracy of reading ft min feet min 80 4921 ft min 2 20 ft min m s meters sec 0 4 25 00 m s 0 01 m s 2 0 2 m sec km h kilometers hour 1 4 90 0 km h 0 1 km h 2 0 2 km hr mph miles hour 0 9 55 9 mph 0 1 mph 2 0 2 m
4. corded Press RECORD again to return the meter to normal operation All stored data will be cleared and the REC MIN MAX icons will disappear from the LCD Note that putting the meter into the Record mode defeats the Auto Power Off feature 4 Model 407412 May 2003 Rev 1 9 RS 232 PC Interface The RS 232 serial data port 3 5mm phono jack is located at the top of the meter next to the sensor input jack The PC interface hardware is intended for use with the Extech Data Acquisition software package Part Number 407001 which includes Windows 95 98 ME NT 2000 compatible software and PC interface cable For more information contact Extech or refer to the 407001 User s Manual Auto Power Off feature The Auto Power Off feature automatically turns the meter off after approximately 10 minutes To defeat this feature place the meter in Record mode by pressing the RECORD key once the REC icon will appear on the LCD The meter will remain powered as long as the meter is in the RECORD mode Battery Replacement When it is time to replace the 9V battery the low battery indicator LBT appears in the left hand corner of the LCD display Note that reliable readings can be obtained for several hours after the first appearance of the low battery indicator To replace the battery 1 Remove the meter s protective rubber holster 2 Pry off the battery compartment cover on the rear of the meter using a small coin or screwdri
5. ph knots nautical miles hour 0 8 to 48 6 knots 0 1 knots 2 0 2 knots Temperature 32 F to 122 F 0 C to 50 C 0 1 F C 1 5 F 0 8 C Relative Humidity 10 to 70 RH 3 RH 70 to 95 RH 4 RH Meter Description iy PE 9 10 Vane RH Probe heac 2 POWER button Probe head 3 Data Hold button E gt mm 4 C F Selection button 1 o 5 Function switch 3 Q j 6 Data Record button E 21 4 Probe 7 Data Recall button la 5 8 Units select button EST P 9 RS 232 output jack 8 A Y 10 Probe input socket i Probe 11 Battery compartment uH 3 Model 407412 May 2003 Rev 1 9 Anemometer and Temperature Operation 1 2 3 4 Insert the Vane sensor into the meter s input jack at the top of the meter Press the POWER button to turn the instrument on Select Anemometer operation by placing the function slider switch to the vane icon Select the temperature units by pressing the C F button The LCD display will indicate C or F as selected Select the air velocity unit of measure by pressing the UNIT button With each press the display scrolls 4 through the units m s km hr ft min knots amp mile h 4 For maximum accuracy the airflow must enter the vane Yello airflow on the side without the yellow dot see diagram Dot The meter s LCD will indicate Air Velocity Uo Temperature Relative Humidity and Temperature Operation Inse
6. rt the Relative Humidity probe in the input jack at the top of the meter Press the POWER button to turn on the instrument 3 Select the Humidity mode of operation by placing the function slider switch to the 9 6RH position 4 Select the temperature units by pressing the C F button The LCD display will indicate C or F as selected 5 Hold the probe by the handle and point it in the area to be measured The meter will display Relative Humidity Temperature 6 Note that humidity measurements take several minutes to stabilize Data Hold Press the DATA HOLD button to freeze the displayed reading The DH icon will appear on the LCD while Data Hold is engaged Press the DATA HOLD button again to resume normal operation Min Max Record Mode When selected the Record mode stores the highest Max and lowest Min readings for later recall To use Record mode 1 2 3 Press the RECORD button The REC indicator will appear on the LCD display Start a measurement session After the measurement session press the RECALL button to view the highest Max reading recorded since the RECORD button was pressed The MAX indicator will appear to inform the user that the displayed reading is the highest value recorded Press the RECALL button again to view the lowest reading encountered since the RECORD key was pressed the MIN indicator will appear on the LCD to inform the user that the reading displayed is the lowest value re
7. ver 3 Replace the 9V battery and reinstall the compartment cover and holster Relative Humidity Calibration Turn the meter on and select the Humidity mode using the slide switch Use a simulator to apply 0 0 C to the meter and adjust VR3 for a display of 0 0 C Change the input to 25 0 C and adjust VR1 for a display of 25 0 C Change the input to 50 0 C and verify a display of 50 0 C Readjust VR3 amp VR1 if necessary Fe 0 PO LP 5 Connect the humidity probe to the unit and place the probe in a controlled 3396 RH environment Let stabilize for a minimum of 30 minutes and adjust VR5 for a reading of 33 096 RH 6 Place the probe in a 75 RH environment for a minimum of 30 minutes and adjust R6 for a reading of 75 096 RH 7 Verify that the temperature reading is within the published specifications If not perform calibration steps 2 and 3 above again 5 Model 407412 May 2003 Rev 1 9 Calibration and Repair Services Extech offers complete repair and calibration services for all of the products we sell For periodic calibration NIST certification or repair of any Extech product call customer service for details on services available Extech recommends that calibration be performed on an annual basis to insure calibration integrity 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
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