User`s Manual Hygro Thermo
Contents
1. published specifications If not perform calibration steps 2 and 3 above again 6 Model 407412 Version 2 1 uly 2006 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 o 42 Support line 781 890 7440 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User Guide Software updates and other Up to the minute product information visit our website www extech com Extech Instruments Corporation 285 Bear Hill Road Waltham MA 02451 Copyright 2006 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 7 Model 407412 Version 2 1 uly 2006 Appendix Area equation for rectangular or square ducts Height H Width W Area A Width W x Height H Area equation for circular ducts Area A Tx r Where T 3 14 and r radius x radius Cubic equations CFM ft min Air Velocity ft min x Area ft CMM m3 min Air Velocity m sec x Are2. s 0 01 m s 2 0 2 m sec 4 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 mph knots nautical miles hour 0 8 to 48 6 knots 2 0 2 knots Temperature 32 F to 122 F 0 C to 50 C 1 5 F 0 8 C Relative Humidity 0 1 70 to 95 RH 4 RH 3 Model 407412 Version 2 1 uly 2006 Meter Description 1 CO al Se On Sensor input plug The Anemometer sensor and the Humidity sensor use the same jack at the top of the meter RS 232 PC Interface jack LCD Display Keypad see below POWER Press to turn the meter ON or OFF HOLD Press to freeze the currently displayed reading C F Press to select the temperature unit of measure RECORD Press to track the MAX and MIN readings RECALL Press to retrieve the current MAX and MIN memory FUNCTION Select Humidity left position or Air Velocity right position UNIT Select the unit of measure for Air Velocity Battery compartment and tilt sand are located on the back of the meter Rubber protective jacket Vane Anemometer sensor Humidity sensor 1 2 3 HOLD 4 RECORD RECALL e RH A 8 amp unir Hypre T A 407412 5 6 T 4 Model 407412 Version 2 1 J uy 2006 Anemometer and Temperature Operation 1 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 Anemomete
3. 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 Open the battery compartment on the back of the meter using a small coin or a flat blade screwdriver 3 Replace the 9V battery close the compartment and replace the holster Relative Humidity and Temperature Calibration Turn the meter on and select the Humidity mode RH using the Function switch 2 Use a temperature simulator or calibrator to apply 0 0 C to the meter and adjust VR3 for a display of 0 0 C 3 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 5 Connect the humidity probe to the unit and place the probe in a controlled 33 RH environment Let stabilize for a minimum of 30 minutes and adjust VR5 for a reading of 33 0 RH 6 Place the probe in a 75 RH environment for a minimum of 30 minutes and adjust R6 for a reading of 75 0 RH 7 Verify that the temperature reading is within the
4. User s Manual EXT INSTRUMENTS Hygro Thermo Anemometer Model 407412 RECORD RECALI Hi AUNT am a 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 Introduction Congratulations on your purchase of Extech s Hygro Thermo Ane
5. a 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 ft min knots km h MPH 1 MPH 16071 1 8 Modal 407412 Version 2 1 uly 2006
6. 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 recorded 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 5 Moda 407412 Version 2 1 J uly 2006 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
7. mometer 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 This meter is shipped fully tested and calibrated and with proper use 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 Max Min Record Records highest and lowest readings for later recall Data Output RS 232 serial PC interface 32 F to 122 F 0 C to 50 C 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 Model 407412 Version 2 1 uly 2006 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
8. r Air Velocity operation by placing the function slider switch to the vane iconA 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 lt M UNIT button With each press the display scrolls 1 through the units m s km hr ft min knots amp mile h For maximum accuracy the yellow dot must be on the y airflow 5 ellow exhaust side of the vane as shown Dot The meter s LCD will indicate Air Velocity Lo Temperature Relative Humidity and Temperature Operation Insert the Relative Humidity probe in the input jack at the top of the meter 2 Press the POWER button to turn on the instrument Select the Humidity mode of operation by placing the function slider switch to the RH 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 in the area to be monitored 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
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