User Guide Heavy Duty Pitot Tube Anemometer and Differential
Contents
1. Press the AVG REC button and the display will show in inches or cm centimeters at the bottom of the LCD in relatively small digits Use the arrow keys to change the unit of measure Press the AVG REC button to save the setting Continue with Step 6 below to set the shape and size of the duct Air Duct Shape 6 Continuing from Step 5 above press the AVG REC button to show the rectangle or circle shape Use the arrow keys to select the shape that matches the air duct in question rectangular or circular duct Press the AVG REC button to store the setting and proceed to Step 9 to enter the air duct area Air Duct Area W x H for Rectangular Ducts ei 9 10 11 12 13 14 15 16 17 Continuing from Step 8 above Skip to Step 18 for Circular ducts For rectangular air ducts the W icon duct width will appear The display will show DECI decimal at the top and a 5 digit number directly below The 5 digit number is used to program the duct s width Use the arrow keys to move the decimal to the desired position Press the SAVE CLEAR button to move the display cursor to the right most digit The right most digits will flash indicating that it is ready to be changed if desired Use the arrow keys to change the value of the right most digits in the range of 0 to 9 Use the SAVE CLEAR button to move to the next digit and change its value if desired using the arrow keys Continue2. OFF to ON or ON to OFF Press the AVG REC button to save the setting Press and hold the SETUP button for two 2 seconds to exit the Setup mode The SETUP display icon will switch off 7 HD350 EU EN V3 0 7 10 Delete Clear Stored Readings As described in the dedicated section on the meter s internal memory feature the meter can store up to ninety nine 99 readings for instant recall The CLEAR feature in the Setup mode allows the user to selectively delete stored readings by type or to delete all of the readings 1 Press and hold the SETUP button for two 2 seconds to enter the Setup mode The SETUP display icon will appear Use the arrow keys to scroll to the ALL display Press the AVG REC button and the display will show YES or NO at the top of the LCD Use the arrow keys to select YES Under the YES display the measurement functions are listed in smaller digits PRESS VEL FLOW Use the SAVE CLEAR button to select the measurement types to delete Press the AVG REC button to clear the selected reading types The meter will beep indicating that that the delete process was successful Press and hold the SETUP button for two 2 seconds to exit the Setup mode The SETUP display icon will switch off 8 HD350 EU EN V3 0 7 10 Measurements Pressure Measurements 1 2 Turn the meter ON using the power button Use the P VIF button to scroll
3. in this manner until the duct width edit is complete Press the AVG REC button to store the Width value and move to the Height H editing procedure Edit the Height value in the same manner as the Width value Press the AVG REC button to store the Height value Press and hold the SETUP button for two 2 seconds to exit the Setup mode The SETUP display icon will switch off 6 HD350 EU EN V3 0 7 10 Air Duct Area pi r for Circular Ducts 18 19 20 21 22 23 24 Continuing from Step 8 above For circular air ducts the D icon duct diameter will appear The display will show DECI decimal at the top and a 5 digit number directly below The 5 digit number is used to program the duct s width Use the arrow keys to move the decimal to the desired position Press the SAVE CLEAR button to move the display cursor to the right most digit The right most digits will flash indicating that it is ready to be changed if desired Use the arrow keys to change the value of the right most digits in the range of 0 to 9 Use the SAVE CLEAR button to move to the next digit and change its value if desired using the arrow keys Continue in this manner until the duct diameter edit is complete Press the AVG REC button to store the Width value and move to the Height H editing procedure Press and hold the SETUP button for two 2 seconds to exit the Setup mode The SETUP display icon will switc
4. the stored readings 3 Use the arrow keys to scroll through the stored readings The reading sample number is shown at the bottom right hand corner of the display 4 Toshow an average of all of the stored readings press the AVG REC button while in the Recall REC mode 5 Use the P V F button at any time during the Recall process to switch between the three modes of measurement Air Velocity Air Flow and Pressure 6 To exit the Recall mode press and hold the AVG REC button for at least 2 seconds The REC display icon will switch OFF and the meter will return to the normal operating mode Deleting Stored Readings Use the P V F button to select a measurement mode Air Velocity Air Flow or Pressure 1 To clear one reading at a time Press and Hold the AVG REC button for at least two 2 seconds to enter the Recall mode the REC icon will appear 2 Use the arrow keys to scroll to the desired reading that is to be deleted 3 Press the SAVE CLEAR button to delete the selected reading Note that the number of samples on the sample counter lower right will have decreased after the reading is deleted 4 Press and hold the AVG REC button for at least two 2 seconds to exit the Recall REC mode 5 To clear ALL of the readings simultaneously refer to the SETUP MODE section earlier in this manual 11 HD350 EU EN V3 0 7 10 Battery Replacement When the low battery indicator appears on the display or
5. x Width a Circle Area A 7 x r Where m 3 14 and r radius x radius lt a T D v Cubic equations CFM ft 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 Copyright 2010 Extech Instruments Corporation a FLIR company All rights reserved including the right of reproduction in whole or in part in any form 15 HD350 EU EN V3 0 7 10
6. User Guide EXTECH INSTRUMENTS A FLIR COMPANY Heavy Duty Pitot Tube Anemometer and Differential Pressure Manometer Model HD350 Introduction Congratulations on your purchase of the Extech HD350 This handheld meter measures and displays air velocity speed air flow volume ambient air temperature and gauge differential pressure This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service Features Pitot tube Anemometer measurements for Air Velocity and Air Flow volume 7 Manometer Differential Pressure Measurements Simultaneous display of Air Flow or Air Velocity Temperature and Pressure 5 selectable pressure units of measure 7 Record up to ninety nine 99 readings in meter s internal memory for each of the three measurement types Air Velocity Air Flow and Pressure for a total of 297 readings USB port for connection to a Personal Computer PC for real time datalogging of up to 5500 readings stored on the PC Large backlit LCD display 7 Data Hold and Maximum Minimum Average memory MIN MAX AVG Auto Power OFF can be disengaged 2 HD350 EU EN V3 0 7 10 Meter Description Pitot tube Hold the tube in the flow of air to take a reading ao So a SY a 10 11 Pressure Manometer hose 1 Black Pressure Manometer hose 2 White Pressure Connector Pressure Connector Temperature sensor LED display shows
7. ections of the manual NOTE Battery Compartment Tilt Stand and Tripod Mount are located on the reverse side of the meter 3 HD350 EU EN V3 0 7 10 Display Description 1 m oS p 10 11 12 13 14 15 16 17 18 19 20 Elapsed timer display units min sec or hour min Pressure Velocity Flow and Temperature mode indicators Primary Measurement Display Units of measure for air velocity 1 Units of measure for pressure 2 Indication that the meter is 3 communicating with the PC Auto Power Off mode indicator Low battery indicator 4 Duct Shape indicator 5 Data Hold indicator 7 6 Height Width rectangular duct or 8 Diameter circular duct Setup mode indicator CLEAR icon appears as data is deleted from the meter s internal memory Reading sample number Memory indicator REC MAX MIN and AVG indicators Temperature units for the primary display Units of measure for air flow Temperature units for the secondary display Secondary display Temperature 20 TEMP L HUL oF PRESS VEL FLOW CFM CMM OOOO hour min min sec OOOO knots MPH ft min m s km h F C PSI mbar inH 0 mmH20 Pa PC REC MAX MIN AVG Duct Shape B D S T0 T Zz 19 18 HD350 EU EN V3 0 7 10 Setup Mode Changing Setup Options The Setup mode is used to select the shape dimensions of an air duct for Air Flow Measurements engage disengage Sleep mode auto power OFF hide view measurement ty
8. h off Meter TYPE Configuration The TYPE feature in the Setup mode allows the user to hide view measurement types Air Velocity Air Flow and Pressure The meter can be configured for Type 1 show Pressure and Velocity measurements Type 2 show Air Velocity and Air Flow measurements Type 3 show all measurement types The steps below outline the configuration process 1 Press and hold the SETUP button for two 2 seconds to enter the Setup mode The SETUP display icon will appear Use the arrow keys to scroll to the TYPE display Press the AVG REC button and the display will show 1 2 or 3 at the top of the LCD Use the arrow keys to select the desired type number If in doubt select 3 to view all measurement types Press the AVG REC button to save the setting Press and hold the SETUP button for two 2 seconds to exit the Setup mode The SETUP display icon will switch off Auto Power OFF Sleep Mode Sleep mode automatically switches the meter OFF after 20 minutes of inactivity This feature goes a long way in preserving battery life To disengage engage this feature 1 Press and hold the SETUP button for two 2 seconds to enter the Setup mode The SETUP display icon will appear Use the arrow keys to scroll to the SLEEP display Press the AVG REC button and the display will show ON or OFF at the top of the LCD Use the arrow keys to change from
9. if the meter does not switch on when the power button is pressed please replace the battery To replace the battery 1 Open the battery compartment by sliding the meter s rear panel in the direction of the embossed arrow 2 Replace the 9V alkaline battery 3 Replace the battery compartment cover 4 You as the end user are legally bound EU Battery ordinance to return all used batteries disposal in the household garbage is prohibited You can hand over your used batteries accumulators at collection points in your community or wherever batteries accumulators are sold wy Disposal Follow the valid legal stipulations in respect of the disposal of the device at the end of its lifecycle USB PC Interface and Software The HD350 is equipped with a USB communication jack on its upper left side The supplied communications cable connects to this jack and to a USB port on a PC The supplied software allows the user to view and save readings to the PC Instructions for use and features are detailed in the supplied software HELP utility 12 HD350 EU EN V3 0 7 10 Display Measurements Data Hold Response Time Linearity Hysteresis MIN MAX AVG Auto Power OFF PC Interface Low battery indication Power supply Operating conditions Storage conditions Relative Humidity Dimensions Weight Weight Specifications General Specifications Multi function LCD with Backlighting Air Velocity m s km h ft min knots m
10. km h MPH knots The meter s primary display digits will represent the air velocity measurement The meter s secondary display digits top right of LCD displays the ambient temperature measurement Connect the hoses to the Pitot tube and to the Meter The Input pressure port on the Meter connects to the white hose from the total pressure connection of the Pitot tube The Ref pressure port on the Meter connects to the black hose from the static pressure connection of the Pitot tube If the Velocity measurement is a negative value on the display ensure that the hoses are attached to the correct ports on the Meter and the Pitot tube With the Pitot tube open to ambient conditions press and hold the HOLD ZERO button for 2 seconds to zero the display Put the mouth of the Pitot tube in the direction of the oncoming air mass under test and read the Air Velocity measurement value on the LCD 9 HD350 EU EN V3 0 7 10 Air Flow Volume Measurements 1 Press the P V F button to enter the Air Flow Volume mode FLOW will appear on the LCD The Primary display area will show the Air Flow measurement 2 Use the UNIT Y button to select the desired unit of measure CMM or CFM 3 To view the currently programmed duct area and shape Press the P VIF button three more times to access the duct size dimensions display The duct shape selection rectangle or circle will appear on the lower left hand area of the LCD a
11. n the Data Hold mode 2 Press the HOLD ZERO button again to exit the Data Hold mode and return the meter s display to real time operation 10 HD350 EU EN V3 0 7 10 MIN MAX and AVG Readings 1 Press the MIN MAX button to start a MIN MAX AVG session The elapsed timer will start shown on the top right secondary LCD display area and indicate the minutes and seconds that have elapsed since the session started 2 Use the P V F button to select the measurement type to review Pressure Air Velocity or Air Flow 3 Use the MIN MAX button to step through the MAX maximum reading MIN minimum reading and AVG average reading for the selected measurement type that has been captured since the MIN MAX AVG session began The elapsed time value is captured along with the MAX and the MIN reading 4 Press and hold the MAX MIN button for at least two 2 seconds to exit the MIN MAX AVG mode Storing Recalling and Averaging Readings The HD350 can store up to 99 readings in its internal memory for each of the three measurement modes Air Velocity Air Flow and Pressure for a total of 297 readings 1 Momentarily press the SAVE CLEAR button to store a reading When the internal memory is full 99 readings the meter will display FU FULL and beep when another reading is attempted to be stored 2 After a series of readings are taken press and hold the AVG REC button to enter the REC Recall mode and begin recalling
12. nd the Area value will be shown above it For Circular ducts the Diameter D of the duct will be shown For Rectangular ducts the Width value W will be shown first press the P V F button again to switch to the Height H value display e Note that the Meter stores displays the last duct shape and size programmed by the user To change the duct size and or shape refer to the earlier SETUP MODE section Press the P V F button again to return to the AIR FLOW screen 4 Now take an air velocity measurement as described in the previous section on Air Velocity ignoring the unit of measure discussions The meter will display Air Flow Volume in Cubic Feet per Minute CFM or Cubic Meters per Minute The meter calculates Air Volume Flow by measuring Air Velocity and taking into account the area of the duct Ambient Temperature Measurements The Secondary display area top right of LCD indicates the ambient temperature sensed by the thermometer located at the top middle of the meter between the two pressure connection posts To change the displayed unit of measure for Temperature use the F C A button The only instances where the Secondary display area will not indicate temperature are when the meter is in the SETUP mode or when the Elapsed Timer is shown Additional Functions Data Hold 1 Press the HOLD ZERO button to freeze the presently displayed reading on the display The display will show the HOLD icon while i
13. pes and selectively delete clear readings from the 99 location internal memory The meter stores these settings in its internal non volatile memory Setup Options Meter Configuration select the measurement parameters to use the others will be hidden Delete Stored readings Entering or Exiting Setup Menu item Unit Duct Shape DECI 99999 Type SLEEP ALL Settings Decimal place and 5 digit number to represent the area Type 1 show Pressure and Velocity Type 2 show Velocity and Flow Type 3 show all measurement types Use the SAVE CLEAR button to _ choose the reading type s to delete _ Select CLEAR to delete Press and hold the SETUP button for 2 seconds to enter or exit the Setup mode When the meter is in Setup mode the display indicates SETUP Changing a Setup Option 1 Use the A V arrow keys to scroll through the setup options 2 Press the AVG REC button when the desired setup parameter is displayed 3 Use the arrow keys to scroll to the desired setting 4 Press the AVG REC button to store the new setting in memory Note The Setup mode is disabled when the meter is in the MIN MAX AVG mode HD350 EU EN V3 0 7 10 Air Duct Properties for Air Flow Measurements Air Duct Unit of Measure le Press and hold the SETUP button for two 2 seconds to enter the Setup mode The SETUP display icon will appear Use the arrow keys to scroll to the UNIT display
14. ph Air Flow CMM m min and CFM ft min Pressure psi mbar inH2O mmH2O Pa Air Temperature C and F Freezes displayed reading 0 5 seconds typ 0 29 F S Record and Recall lowest highest and average readings Automatic shut off after 20 minutes can be disengaged USB PC Communication with supplied software and cable for data acquisition Battery symbol appears on the LCD 9V Battery 0 to 50 C 32 to 122 F 10 to 60 C 14 to 140 F Non condensing lt 10 C 90 RH 10 to 30 C 75 RH 30 to 40 C 45 RH 40 to 50 C without condensation Main instrument 210 x 75 x 50mm 8 2 x 2 9 x1 9 280g 9 8 oz 13 HD350 EU EN V3 0 7 10 Air Velocity Specifications Air Velocity Range 7 Resolution 7 Accuracy m s meter per second 1 to 80 00 ft min feet per minute 200 to 15733 1 FS Sdigits km h kilometers per hr 3 5 to 288 0 5 00 to 10 00m s MPH miles per hour 2 25 to 178 66 Knots nautical mph 2 0 to 154 6 Air Flow Specifications Air Flow Resolution 0 3 F S Full Scale at 25 C 40 2 Max 0 5 F S 40 29 F S 5000 Pa 10psi 0 5 Seconds typical Range Indicator Over range Err 1 Under range Err 2 Temperature Specifications Accuracy 7 1 5 C 32 0 to 122 0 F 3 0 F 14 HD350 EU EN V3 0 7 10 Useful Equations Calculating the Area for rectangular or square ducts Rectangle Area A Height b
15. readings units setup parameters and user alerts PC interface jack Use the supplied cable to connect the meter to a PC Upper Keypad F C A Press to change the unit of measure for Temperature Also functions as an up arrow key UNIT V Press to change the unit of measure for Pressure Air Velocity and Air Volume Flow Also functions as a down arrow AVG REC Used to obtain the 10 Average for multi point measurements in either FLOW or VELOCITY modes Up to twenty 20 points can be averaged Press and hold this button for 3 seconds to access the data Recall mode REC ole SETUP Momentary key presses turn the backlight on and off Press and hold this button for 3 seconds to enter or exit the Setup mode discussed later in this guide Lower Keypad MAX MIN Press to record and store the highest lowest and continuous moving average readings for single point measurements Press and hold this button to exit this function SAVE CLEAR Press to store a reading In recall mode pressing this button clears a data sample P V F Press to select Pressure P Air Velocity V or Air Flow F HOLD ZERO Momentary presses freeze and un freeze the displayed reading Press and hold the button to ZERO OFFSET the displayed reading On Off button Press to turn the meter ON or OFF KEYPAD NOTE In Setup mode several buttons have special uses not detailed above but are described in subsequent s
16. to the Pressure Measurement Mode the PRESS display icon will appear The Primary display shows gauge or differential Pressure measurements in the range of 5000Pa in the following units of measure selectable PSI mbar Pa inH2O and mmH2O To change the displayed unit of measure for Pressure use the UNIT YW button Ambient Temperature readings will appear at the top right of the LCD on the Secondary display digits To change the displayed unit of measure for Temperature use the F C Abutton For Gauge Pressure Measurements connect a single hose to the INPUT port and leave the REF port unconnected With the other end of the connected tubing open to ambient conditions press and hold the HOLD ZERO button until the meter display flashes a series of o symbols and then displays zeros This nulls the meter s Pressure display Connect the attached hose to the pressure under test and read the displayed pressure value For Differential Manometer Pressure Measurements connect tubing to the INPUT port and the REF port The meter will now display a positive pressure reading if the INPUT pressure is greater than REF and a negative reading if REF is greater than INPUT Air Velocity Speed Measurements 1 Press the PVF button to select the Air Velocity measurement mode the VEL display icon will appear on the LCD Use the UNIT Y button to select the desired measurement unit m s ft min
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