User`s Manual - Global Water Instrumentation, Inc.
Contents
1. If the duct measurements are made in inches divide the inches by 144 to get the area in square feet Plug the area value in square feet in the cubic equations below Note that the air velocity must be plugged into the cubic equations also For circular ducts measure For rectangular the radius r square the ducts multiply the Height radius and multiply the radius by 7 3 14 A mr or A 3 14xrxr Height x Width Width Cubic Equations CFM ft min Air Velocity ft min x Area ft CMM m min Air Velocity m sec x Area m x 60 Maintenance Battery Replacement The 45158 has a low battery indicator battery symbol Important Turn the meter off before opening the battery compartment Using a coin turn the battery compartment cover CLOCKWISE to remove it Once opened observe the position of the battery placing the new one in the same position Secure the battery compartment cover and dispose of the lithium battery in accordance with local state or national disposal codes Impeller Replacement Remove the set screw next to the impeller assembly on the rear of the meter Twist the impeller assembly counter clockwise to the OPEN position and remove it Install impeller by inserting amp twisting the new impeller assembly clockwise Tighten the set screw Calibration and Repair Services Extech offers complete repair and calibration services for all of the products we sell For periodic calibration2. 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 a N 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 3 Model 45158 Version 1 8 May 2003 Unit of Measure Conversion Tables Units Conversion Table P ms fimin Knots kmh 196 87 1 944 0 00508 0 00987 0 01829 0 01138 A knot 0 5144 101 27 1 8519 1kmih 0 2778 54 69 Beaufort Conversion Table Beaufort Km Hour MPH Knots _ Meter Sec C ee ee ee ae a ee ee 2 eon a 4 eee 4 28s nae mie 5 s a na 6 a 3 22237 10 8138 13 9 17 1 8 en ae 34o 172207 9 8e 4a mAT 208 244 24 5 28 4 28 5 32 6 12 to 17 above 117 above 72 above 63 above 32 6 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 Dep
3. User s Manual EXT INSTRUMENTS Model 45158 Mini Hygro Thermo Anemometer Introduction Congratulations on your purchase of Extech s Model 45158 Anemometer The dual display indicates Air Velocity and Humidity Dew Point Ambient Temperature or Temperature with wind chill factor With careful use this meter will provide years of reliable service Mini Thermo Anemometer Specifications Range Specifications Measurement MPH Miles per hour km hr kilometers per hour Knots nautical miles per hour m sec meters per second ft min feet per minute Beaufort force Temperature Relative Humidity Dew Point 0 to 122 F 18 to 50 C 0 1 F C 10 to 95 32 to 122 F 0 to 50 C 1 8 F 1 C 1 5 RH 0 19F C Range Resolution Accuracy of reading oe C 3 6 F 2C General Specifications Display Dual LCD with low battery and multifunction indicators Sensors Sapphire bearing non corrosive vane for air velocity Precision thermistor for temperature measurements Average Mode Choice of 5 or 10 reading averaging 2 second factory default Max and Data Hold Displays Max recalls the highest reading Data Hold freezes the display Sample time 1 reading per second for air velocity and temperature 1 reading per 15 seconds for humidity with 2 second updates Water resistant To 3 1m Operating conditions 5 to 1229F 15 to 50 C lt 80 RH Powe
4. artment 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 Copyright 2003 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 4 Model 45158 Version 1 8 May 2003
5. r supply Lithium battery CR 2032 or equivalent 400 hour battery life Dimensions Weight Instrument 5 25 x 2 75 x 0 75 133 x 70 x 19mm Vane 1 24mm diameter 3 oz 95 g Meter Description Vane impeller 1 Impeller set screw on rear of meter 2 Relative Humidity sensor 3 Temperature sensor 4 LCD display EXTEGH 45158 ON OFF HOLD key UNITS MODE key Battery compartment on rear Tripod mounting hole 0 Lanyard neckstrap oa 13 1 F UNITS MODE gt O AN OA FR WN EXTECH INSTRUMENTS Mini Thermo Anemometer 10 Operation Turning the meter ON and OFF e Press the ON OFF HOLD button to turn the meter ON e Press and hold the ON OFF HOLD buttons for approx 3 seconds to turn it OFF e The meter s Auto Power OFF feature turns the meter OFF after 10 minutes of inactivity Change the lower display parameter e With the meter ON press and hold down the ON OFF HOLD button e While continuing to hold the ON OFF HOLD button press the UNITS MODE button repeatedly to step through Temperature F C Humidity RH Dew Point TD amp Temperature with wind chill factor WCl Note that the center display is Air Velocity Change the Air Velocity unit of measure e Turn the meter OFF Press and hold down both buttons until the display turns on and begins blinking then release both buttons e Press the UNITS MODE button repeatedly to step through the units
6. see specs for list e After 5 seconds the meter switches back to normal operation mode automatically Select temperature units C or F e Turn the meter OFF first Press and hold down both buttons until the display turns on and begins blinking then release the buttons e Press both buttons momentarily to change temperature units e After 5 seconds the meter switches back to normal operation mode automatically Taking Measurements Position the meter so that the airflow enters the meter vane from the rear of the meter opposite side of front panel logo A tripod mount is located on the bottom of the meter Max Hold e Max Hold represents the highest measurement taken since the meter was turned on e Press the UNITS MODE button to display the Max reading MAX icon appears e Press the UNITS MODE button repeatedly to step through to the normal operating mode Average mode e 5or 10 reading averages can be displayed in the Average Mode e Press UNITS MODE 3 times for 5 reading averaging or 4 times for 10 readings e To exit this mode press the UNITS MODE button until the icons on the left disappear Data Hold e Data Hold freezes the most recent displayed reading e Press and hold the ON OFF HOLD button to activate Data Hold e As long as the ON OFF HOLD button is held the reading will remain on the LCD 2 Model 45158 Version 1 8 May 2003 CFM Measurements Measure the area of the duct using the diagrams below for rectangular and circular ducts
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