User`s Manual CFM/CMM Thermo Anemometer 94204
Contents
1. Flow C F Temperature units of measure CFM CMM airflow units of measure AREA Ft m units for area dimensions m s ft min km h MPH knots air velocity units of measure Operation Connecting the Vane 1 The vane plug is inserted in the meter s sensor jack at the top of the m and jack are keyed so that the plug can only fit in the jack one way 2 Turn the plug carefully until it lines up with the jack and then firmly pus place Do not apply undue force or try to twist the plug side to side 3 If the vane is not connected to the meter or if the sensor is defective tl will indicate OL in place of a Temperature reading Air Velocity Measurements Single Point Side view of Vane 1 2 Press UNITS button to select the desired unit of Air Velocity Averaging Mode 1 Turn on the meter using the ON OFF button Arrow measure NOTE At power up the meter will display the last unit of measure previously e entered Place the sensor in the air stream Ensure that the air enters the vane as indicated by the arrow lt sticker placed inside the vane View the readings on the LCD Display The large main LCD display shows the Air Velocity reading The upper right LCD sub display shows the temperature reading To enter 20 Point Averaging Mode press and hold the AVG button un The AVG icon will be displayed Take a measurement and press the AVG button A single beep will so HOLD icon will appear in th2. User s Manual CFM CMM Thermo Anemometer 94204 Introduction The CFM CMM Thermo Anemometer instrument measures Air Velocity A volume and Temperature The large easy to read backlit LCD includes secondary displays plus numerous status indicators The meter is shipped and calibrated and with proper use will provide years of reliable service Meter Description LCD Display Meter Vane Temperature Buttons Power On Off Airflow Velocity Buttons AVG Backlight A E E Keypad POWER Press to turn the meter ON or OFF MAXMIN Used to record and store the highest lowest and averac velocity readings lt LEFT also serves as change decimal point button in AREA mc UNITS Press to select the mode of operation In FLOW mode the air volume In VELOCITY mode the meter displays air speed A UP also serves as increase number button in AREA mode Display Layout REC MAX MIN mom 0000 ft m VEL FLOW CFM CMM m s 1 ft min km h T MPH i knots E E X10 X100 REC MAX MIN AVG KOND MAX top of LCD Max Hold function engaged for the Air Temper HOLD top of LCD Data Hold function engaged for the Air Tempe VEL indicates that meter is in air velocity mode FLOW indicates that meter is in air flow mode MAX bottom of LCD Max Hold for the Air Velocity and Air Flow f HOLD bottom of LCD Data Hold for the Air Velocity and Air
3. d low friction ball bearing Temperature sensor NTC type precision ther Auto shut off after 20 minutes to preserve batt 32 to 122 F 0 to 50 C 14 to 140 F 10 to 60 C lt 80 RH lt 80 RH 2000 meters 7000ft maximum One 9 volt NEDA 1604 battery 80 hours approx if the Backlight is used cont life will be reduced significantly 8 3 mA DC approx Useful Equations and Conversions 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 Ox r Where 3 14 and r radius x Cubic equations CFM ft min Air Velocity ft min x Area ft CMM m min Air Velocity m sec x Area m x 60
4. e display The average reading will be displayed and number of readings measu the upper right hand corner of the display After 5 seconds the display current reading Air Flow Measurements CMM CFM 18 2 Turn on the meter using the O ON OFF button Side view of Press the UNITS button to select the desired air flow units CMM cubic meters per minute or CFM cubic feet per minute NOTE At power up the meter will puch display the last unit of measure previously entered ue To begin entering the area in m or f press and lt hold the AREA button until it beeps twice The gt gt leftmost digit of the bottom display will begin to flash Use the A UP button to change the flashing digit Use the lt LEFT button to move the decimal Use gt RIGHT button to select the other digits After all of the digits are entered press and hold the AREA button until meter beeps twice to save the area into memory CFM or CMM measuring mode Place the sensor in the air stream Ensure that the air enters the van the arrow sticker placed inside the vane Refer to the diagram The le display shows the Air Velocity reading The upper right LCD sub disp temperature reading The meter has 16 memory locations 8 for CFM and 8 for CMM that can be commonly used area sizes that you can recall at anytime 1 Press the AREA button until meter beeps twice A memory location r appear in the top right of the display indicating the memory l
5. ocation Push the NEXT button to scroll thru and select the desired location selected the desired memory location enter your dimension Use the A UP button to change the flashing digit Use the LEFT button to move the decimal Use RIGHT button to select the other digits After all of the digits press and hold the AREA button until it beeps twice to save the are and return to CFM or CMM measuring mode To select and use a previously stored dimension press and hold the AREA Data Hold Air Velocity Air Flow 1 While taking measurements press the HOLD button to freeze the air reading 2 The HOLD indicator will appear in the bottom of the LCD display 3 Press HOLD again to return to normal operation MAX MIN AVG Record Air Velocity Air Flow This allows the user to record and view the highest MAX lowest MIN a AVG readings Press the button MAX MIN button The MAX indicator and RECORD i with the Max reading will appear on the LCD display and the meter wil track of the MAX MIN and Average values Press the MAX MIN button again to view the minimum reading The M along with the minimum reading will appear on the LCD display Press the MAX MIN button again to view the average reading The AV along with the average reading will appear on the LCD display NOTE Average recording will stop automatically after 2 hours and tl sub display will show a OFF only in the average mode Press the MAX MIN butt
6. on again to display current readings NOTE t keep recording MAX MIN AVG readings To clear and stop MAX MIN AVG recording and return to normal oper hold the MAX MIN button until the meter beeps twice Automatic Power OFF To conserve battery life the meter automatically turns off after 20 minutes feature 1 2 3 Turn the meter OFF Press and hold thet Backlight key while turning the meter ON dis APO will appear in the display The AUTO POWER OFF feature disabled Note that AUTO POWER OFF is re enabled each time the meter is tur MES at ie RITA ee Od el a AA SAD AENA Sees Specifications m s meters per sec 0 40 30 00 m s 0 01 m s km h kilometers hour 1 4 108 0 km h ft min feet per minute 80 5900 ft min mph miles per hour 0 9 67 0 mph 0 1 km h 1 ft min 0 1 mph knots nautical MPH 0 8 to 58 0 knots 0 1 knots Air Temperature Circuit Display Sampling rate Sensors Automatic Power off Operating Temperature Storage Temperature Operating Humidity Storage Humidity Operating Altitude Battery Battery life Battery Current perio Range Resolution CMM cubic meters min 0 999900 m min 0 001 to 100 O CFM cubic ft min 0 999900 ft min 0 001 to 100 O 14 140 F 10 60 C 0 1 F C Custom LSI microprocessor circuit Dual function 0 7 16 mm 4 digit LCD 1 reading per second approx Air velocity flow sensor Conventional angle
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