DAFM3 1-800-547-5740 • Fax: (503) 643-6322 www.ueitest.com • email: info@ueitest.
TABLE OF CONTENTS Introduction ...........................................................................................2 Safety........................................................................................................3 Controls................................................................................................ 4-5 Operating Instructions Disable Auto Power Off..................................................................5 Selecting Units...................................
Introduction The DAFM3 Anemometer/Psychrometer meter is designed with 6 HVAC/R must have parameters in one instrument. These are included in a portable battery operated instrument for measuring Humidity, Air temp., Dew Point, Wet Bulb, Air Velocity and Air Volume. The sensor is built into the remote fan and is specially protected by a twist cap. While in operation, open the cap for accurate temperature and humidity readings.
Safety Notes Before using this meter, read all safety information carefully. In this manual the word “WARNING” is used to indicate conditions or actions that may pose physical hazards to the user. The word “CAUTION” is used to indicate conditions or actions that may damage this instrument. CAUTION! Objects striking the fan may damage meter. IMPORTANT NOTE: 1. Rotate the protective cover in the center of the fan to open before measurement to ensure the measured data is correct. OPEN CLOSED 2.
Controls and Indicators 1. 2. 3. 4. 5. 6. 7. 8. 1. ON/OFF: Turns ON the meter with auto-sleep mode. Turns OFF the meter at any mode. NOTE: When the meter is OFF, press more than four seconds to enter “UNITS” selection. 2. MODE: Press to select different modes (Temp, DP, WB, RH, Velocity). Press and hold until beep to select “VOLUME” function. 3. ENTER: To confirm the setting and calibration.
. HOLD: Press to hold the current reading, then press this key again to unlock the held reading. 7. REC/START: In velocity mode, pressing this key to store the current velocity reading into memory. • To start measuring volume without waiting to finish countdown in “Volume” mode. 8. AVG Velocity/Total Volume [next digit]: Press to display average of stored velocity in standard mode, total volume in CFM mode. Press a second time to return.
Basic Measurement (continued) Parameters Measured will cycle through the following in order • Air Velocity • Dry Bulb Temperature • Dew Point Temperature (DP) • Wet Bulb Temperature (WB) • Relative Humidity (RH%) MIN/MAX/AVG All modes will capture the average (AVG), minimum (MIN) and maximum (MAX) value since the meter was powered on. Select AVG/ MIN/MAX by pressing this button. Pressing “MODE” while displaying “MIN/MAX” or “AVG” will scroll through available readings.
Measuring Air Flow (continued) Air volume is measured to determine the total amount of air going through an area in a given amount of time. We are typically looking for cubic feet per minute (CFM) as it relates to heating or cooling equipment. To determine this, you must either direct all of the air through a known area, or use an instrument to measure velocity that can calculate the CFM from the known area. To understand we can compare to something more common.
A register example is 4” by 10”. The area of this in square inches is 4 x 10 = 40 square 12 inches. Next convert that to square feet ” dividing by 144 results in 0.278 square feet. 12” This would give the total area if it were open, Area Areaisislength lengthxxwidth width but because the grill covers a portion of this 12”x12”=144 12”x12”= 144sq. sq. inches inches Converting to sq. we need to estimate the amount of area that is Converting to sq.ft.ft. 144 sq inches/144=1 sq really open. ft144 sq.
Advanced Measurement Mode (Volume) The DAFM3 can calculate the air volume, and display the result after taking a 30 second average. The DAFM3 only measures the velocity of the airflow, so entering an area into the meter is critical. This is also one of the most involved portions of the DAFM3 operation. Note: If the Enter key is pressed when trying to advance to “D” (Diameter) or “AREA” by accident, the only method to recover is to power the meter off and then back on.
Note: If when trying to advance from LW or D to AREA the “ENTER” key is pressed it will accept the displayed value in advance to the 20-second countdown. If this is done in error turn the meter off and start the process at the beginning. Entering Area Length/Width After you decide if you will be using LW (Length and Width for an open square duct) D (Diameter for open round duct), or AREA (Effective area of a grill – Ak value) you will need to enter the area.
After the 20 second countdown, the meter will enter a 30 second average sample period. The immediate air volume is displayed as measurements are made, with the meter displaying an average at the end of the 3 0 seconds. During the sample time, the following screen will be displayed. After the sample is complete, the meter will display the average volume from your test area.
Maintenance Periodic Service WARNING! Repair and service of this instrument is to be performed by qualified personnel only. Improper repair or service could result in physical degradation of the meter. This could alter the protection from electrical shock and personal injury this meter provides to the operator. Perform only those maintenance tasks that you are qualified to do. Cleaning Periodically clean your meter’s case using a damp cloth.
Troubleshooting Power on but Press the power key more than 3 seconds no display Replace the battery and try again Remove the battery and wait one minute Reinstall and try again E1 The probe is not connected or damaged E2 The value is underflow E3 The value is overflow E4 The original data that is relative to this value has an error E5 Out of meter display range E6 The value is not calculated completely E11 Humidity Calibration error 13
Specifications Temperature Relative Humidity Dew Point Wet Bulb Temperature Air Velocity Air Volume Power Dimensions -4˚ to 140˚F (-20˚ to 60˚C) Accuracy: ±1˚F (+0.6˚C) Resolution: 0.1˚F (0.1˚C) 0 to 100% RH Accuracy: ±3% at 10 to 60% RH ±5% at other range Resolution: 0.1% -90˚ to 158˚F (-68˚ to 70˚C) Accuracy: ±3% at 10 to 60% RH ±5% at other range Resolution : 0.1˚ -7.
® DAFM3 Digital Air Flow Meter Limited Warranty The DAFM3 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.
