DAFM3B Digital Air Flow Meter INSTRUCTION MANUAL ENGLISH O OPEN CL SE DAFM3B 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 DAFM3B 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 vane probe includes sensors for velocity, temperature and humidity.
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 prior section 3. Place the probe at the face of the opening, or on the grill surface 4. Press “START” to begin timed average a. Slowly move the probe across the entire surface of the grill or duct opening 5. Press “STOP” to end timed average. a.
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 be used to 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 exact. 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 ±5% ±5% Temperature range -4 ~ 140°F -20 ~ 60°C Temperature resolution 0.1°F 0.1°C Temperature accuracy ±1˚F ±0.6˚C RH% range 0.1 ~ 99.9% RH RH% resolution 0.1% RH RH% accuracy ±3% (10 ~ 60% RH); ±5% at others Wet bulb range -7.6 ~ 158 °F -22 ~ 70°C Wet bulb resolution 0.1°F 0.
DAFM3B Digital Air Flow Meter Limited Warranty The DAFM3B 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.
