DT-619 User Manual
Contents
1. operation press and 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 To defeat this feature 1 Turn the meter OFF 2 Press and hold thez Backlight key while turning the meter ON 3 dis APO will appear in the display The AUTO POWER OFF feature will now be disabled 4 Note that AUTO POWER OFF is re enabled each time the meter is turned on 5 Also note that AUTO POWER OFF is disabled in CFM CMM or Average mode Battery Replacement When appears on the LCD the 9V battery must be replaced PpPoann Disconnect the sensor Remove the meter s rubber protective jacket Use a Phillips screwdriver to open the rear battery compartment Replace the 9V battery Close the battery compartment and replace the meter s protective jacket Specifications Air Velocity m s meters per sec km h kilometers hour 0 40 30 00 m s 0 01 m s 3 0 20 m s 1 4 108 0 km h 0 1 km h 3 0 8 km hr ft min feet per minute 80 5900 ft min 3 40 ft m mph miles per hour 0 9 67 0 mph 0 1 mph 3 0 4 MPH 0 8 to 58 0 knots 0 1 knots 3 0 4 knots knots nautical MPH CMM cubic meters min CFM cubic ft min Air Temperature Circuit Display Sampling rate Sensors Automatic Power off Operating Temperature Storage Temperature Operating Humidity Storage Humidity Operating Altitude Ba2. After 5 seconds the display will return to the current reading Repeat steps 2 3 until the desired number of points have been measured To return to standard velocity measuring mode press and hold AVG button until meter beeps twice Note In the standard velocity measuring mode press the AVG button once to recall the previous average The average will be cleared when you enter the Averaging Mode again Air Flow Measurements CMM CFM 1 2 Turn on the meter using the ON OFF button Press the UNITS button to select the desired air flow units CMM cubic meters per minute or CFM cubic Side view of Vane feet per minute NOTE At power up the meter will Arrow display the last unit of measure previously entered lt To begin entering the area in m or ft press and lt airflo hold the AREA button until it beeps twice The leftmost digit of the bottom display will begin to flash 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 are entered press and hold the AREA button until meter beeps twice to save the area into memory and return to CFM or CMM measuring mode Place the sensor in the air stream Ensure that the air enters the vane as indicated by the arrow sticker placed inside the vane Refer to the diagram The large main LCD display shows the Air Velocity reading The upper right
3. LCD sub display shows the temperature reading The meter has 16 memory locations 8 for CFM and 8 for CMM that can be used to store commonly used area sizes that you can recall at anytime 1 Press the AREA button until meter beeps twice A memory location number will appear in the top right of the display indicating the memory location Push the NEXT button to scroll thru and select the desired location Once you have 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 gt RIGHT button to select the other digits After all of the digits are entered press and hold the AREA button until it beeps twice to save the area into memory and return to CFM or CMM measuring mode To select and use a previously stored dimension press and hold the AREA button until it beeps twice Press NEXT to scroll thru the 8 memory locations Press and hold the AREA button until it beeps twice to return to CFM or CMM measuring mode Air Flow Averaging Mode 1 To enter 20 Point Averaging Mode press and hold the AVG button until it beeps twice The AVG icon will be displayed Take a measurement and press the AVG button A single beep will sound and the HOLD icon will appear in the display The average reading will be displayed and number of readings measured will appear in the upper right hand corner of the display After 5 seconds the d
4. User s Manual CFM CMM Thermo Anemometer Model DT 619 Introduction The CFM CMM Thermo Anemometer instrument measures Air Velocity Air Flow volume and Temperature The large easy to read backlit LCD includes primary and secondary displays plus numerous status indicators The meter is shipped fully tested and calibrated and with proper use will provide years of reliable service Meter Description LCD Display Vane Rubber Boot Meter Power On Off Area AVG Backlight Temperature Buttons 0 Airflow Velocity Buttons N ODE DIN ah SD Keypad AUTO POWER orr Press to turn the meter ON or OFF MAX MIN Used to record and store the highest lowest and average airflow or velocity readings LEFT also serves as change decimal point button in AREA mode UNITS Press to select the mode of operation In FLOW mode the meter displays air volume In VELOCITY mode the meter displays air speed A UP also serves as increase number button in AREA mode AVG Used to Average multiple readings in FLOW or VELOCITY mode Up to 20 readings can be averaged HOLD Press to freeze the displayed reading Press again to unlock display This button also functions as the RIGHT scroll button in AREA mode and RECALL mode AREA Press and hold to manually enter the area of a duct in CFM or CMM mode NEXT In AREA mode used to select memory locations 1 8 Press to turn the backlight on off MAX MIN Temperature Use
5. cting the Vane 1 The vane plug is inserted in the meter s sensor jack at the top of the meter The plug and jack are keyed so that the plug can only fit in the jack one way Turn the plug carefully until it lines up with the jack and then firmly push the plug in 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 the LCD display will indicate OL in place of a Temperature reading Air Velocity Measurements Single Point Side view of Vane 1 Turn on the meter using the ON OFFO button 2 Press UNITS button to select the desired unit of Arrow measure NOTE At power up the meter will display the last unit of measure previously e entered 3 Place the sensor in the air stream Ensure that airflow the air enters the vane as indicated by the arrow sticker placed inside the vane 4 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 Air Velocity Averaging Mode 1 To enter 20 Point Averaging Mode press and hold the AVG button until it beeps twice The AVG icon will be displayed Take a measurement and press the AVG button A single beep will sound and the HOLD icon will appear in the display The average reading will be displayed and number of readings measured will appear in the upper right hand corner of the display
6. d to record and store the highest lowest readings for air temperature C F HOLD Temperature Press to freeze the displayed temperature reading Press again to unlock the display Press and hold for 3 seconds to switch between C and F Meter will beep twice to indicate change Battery compartment located on the back of the instrument The rubber protective jacket must be removed from the meter to access the compartment Display Layout MAX MIN HOLD MAX MIN AVG HOLD MAX top of LCD Max Hold function engaged for the Air Temperature function HOLD top of LCD Data Hold function engaged for the Air Temperature function 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 IR Temperature and RH function HOLD bottom of LCD Data Hold for the IR Temperature function and RH function C F Temperature units of measure CFM CMM airflow units of measure Ft m units for area dimensions m s ft min km h MPH knots air velocity units of measure X10 X100 multipliers for air flow readings AVG air averaging mode RECORD indicates that min max function is running top for temp bottom for air Large LCD digits at center of display for Relative Humidity and IR Temperature Smaller LCD digits at top right of display for Probe Temperature _ Low battery indicator Operation Conne
7. isplay will return to the current reading Repeat steps 2 3 until the desired number of points have been measured To return to standard airflow measuring mode press and hold AVG button until meter beeps twice Note In the standard velocity measuring mode press the AVG button once to recall the previous average The average will be cleared when you enter the Averaging Mode again 5 Data Hold Air Velocity Air Flow 1 While taking measurements press the HOLD button to freeze the air velocity air flow 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 and average AVG readings Press the button MAX MIN button The MAX indicator and RECORD indicator along with the Max reading will appear on the LCD display and the meter will begin keeping track of the MAX MIN and Average values Press the MAX MIN button again to view the minimum reading The MIN indicator along with the minimum reading will appear on the LCD display Press the MAX MIN button again to view the average reading The AVG indicator along with the average reading will appear on the LCD display Press the MAX MIN button again to display current readings NOTE the meter will keep recording MAX MIN AVG readings To clear and stop MAX MIN AVG recording and return to normal
8. ttery Battery life Battery Current Weight Dimensions 3 0 4 knots Range Resolution Area Custom LSI microprocessor circuit Dual function 0 5 13 mm 4 digit LCD 1 reading per second approx Air velocity flow sensor Conventional angled vane arms with low friction ball bearing Temperature sensor NTC type precision thermistor Auto shut off after 20 minutes to preserve battery life 32 F to 122 F 0 C 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 continuously battery life will be reduced significantly 8 3 mA DC approx 1 6 Ibs 725g including battery amp probe Main instrument 7 0 x 2 9 x1 2 178 x 74 x 33mm Sensor Head 2 75 70mm Diameter 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 x r Where 3 14 and r radius x radius Cubic equations CFM ft3 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 1 km h 0 2778 54 69 0 54 1 0 6222 1 MPH 0 4464 87 89 0 8679 16071 1
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