DAFM4 Digital Air Flow Meter INSTRUCTION MANUAL ENGLISH DAFM4 CFM VOL LW MODE HOLD START STOP EXIT LW-D-AREA MAX / MIN AVG [HOLD TO EXIT AVG MODE] ON / OFF (SET) 1-800-547-5740 • Fax: (503) 643-6322 www.ueitest.com • email: info@ueitest.
TABLE OF CONTENTS Introduction ................................................................................................3 Safety...........................................................................................................3 Controls and Indicators...............................................................................4 Figures and Components.............................................................................5 Operating Instructions Disable Auto Power Off..................
INTRODUCTION The DAFM4 Anemometer/Psychrometer is designed with 6 HVAC/R parameters in one instrument. These are included in a portable, batteryoperated instrument for measuring humidity, air temperature, dew point, wet bulb, air velocity and air volume. The small vane probe includes sensors for velocity, temperature and humidity all on a telescoping extension, making in-duct and surface measurements possible.
CONTROLS AND INDICATORS 5 2 3 MODE HOLD START/ STOP 4 6 7 EXIT LW-D-AREA [HOLD TO EXIT AVG MODE] MAX / MIN AVG 1 ON / OFF (SET) 1. On/Off (Setup): Press briefly to power meter on. Press and hold to turn the meter off. • Note: When the meter is OFF, press more than two seconds to enter SETUP mode. 2. HOLD: Freezes display reading for current parameter 3.
FIGURES AND COMPONENTS OPERATING INSTRUCTIONS DISABLE AUTO POWER OFF With the meter off, press and hold ON/OFF and HOLD for more than two seconds. The display will show an “n” indicating that auto power off is disabled. SELECTING UNITS • With the meter off press and hold ON/OFF (Set) button for more than two seconds.
OPERATING INSTRUCTIONS CONT. • VOL – Air volume in CFM or CMM, based on dimensions entered Note: Icon at bottom of screen will indicate the method used to calculate volume (LW-Length/Width, D-Diameter, A – Area).
MEASURING AIR VOLUME (CFM OR CMM) CONT. TIMED AVERAGE AIR VOLUME 1. Press MODE until VOL is showing in the upper right corner of the display 2. Enter duct dimensions using the method described on page 6 3. Extend the probe to the width of the duct or more 4. Verify that you are aiming the “Air In” into the air flow. This is the side opposite of the inch/cm markings on the probe extension. The grooves of the probe should be perpendicular to the air flow direction 5.
MEASURING AIR VOLUME CONT. We recommend the following number of access holes depending on duct size; • 18” or less – Two access holes 6” apart • 18”~30” – Five access holes • 30”~36” – Six access holes • Greater than 36” – Seven access holes ACCESS HOLE SPACING Use the Log-Tchebycheff Rule for rectangular ducts to determine spacing for access holes. Number of access holes per side Position relative to inner wall (multiplier) 5 0.074, 0.288, 0.500, 0.712, 0.926 6 0.061, 0.235, 0.437, 0.563, 0.765, 0.
DIAGRAM OF LOCATIONS 1.8” 6.9” 12” 17.1” 24” 22.2” DAFM4 CFM VOL LW 24” MODE HOLD START STOP EXIT LW-D-AREA MAX / MIN AVG [HOLD TO EXIT AVG MODE] ON / OFF (SET) Access Hole Location ROUND DUCT ACCESS HOLE LOCATION For round ducts drill three holes at 60 degrees separation. This will allow you to cover all locations recommended using the log-Tchebycheff method for round ductwork. Locate all access holes in a straight section of ductwork.
ESTIMATING FREE AREA (EFFECTIVE AREA) OF A GRILL To obtain air volume on a grill with unknown effective or free area you must estimate the free area. This is difficult, but can provide an estimate of the volume for comparison testing. If multiple grills of the same design are compared using this method, you will have an accurate relative comparison, although the actual value may not be known. Method 1 • Measure length and width in inches.
MAINTENANCE LOW BATTERY When the low battery “ ” icon appears on the display, all readings will change to “ “ to prevent inaccurate results. Change the 9V battery located in the inner compartment on the rear of the instrument. CLEANING Periodically clean your meters case using a damp cloth (not wet) only. DO NOT use abrasive, flammable liquids, cleaning solvents, or strong detergents as they may damage the finish, impair safety, or affect the reliability of the structural components.
SPECIFICATIONS: English Metric Air Velocity Range 99 ~ 3937 ft/min 0.5 ~ 20 m/s Air Velocity Resolution 0.1 ft/min 0.1 m/s Air Velocity Accuracy ±(3% or reading + 39 ft/min) ±(3% or reading + 0.2m/s) Temperature Range -4 ~ 140°F -20 ~ 60°C Temperature Resolution 0.1°F 0.1°C Temperature Accuracy ±1.1°F(-4 ~ 122°F); ±2.2°F at others ±0.6°C(-20 ~ 50°C); ±1.2°C at others RH% Range 0.1 ~ 99.9% RH RH% Resolution 0.
DAFM4 Digital Air Flow Meter Limited Warranty The DAFM4 is warranted to be free from defects in materials and workmanship for a period of one year from the date of purchase. If within the warranty period your instrument should become inoperative from such defects, the unit will be repaired or replaced at UEi’s option.
