Introduction
The DAFM2 is used to check air velocity FPM (feet per minute) and
CFM (cubic feet per minute) in residential, light commercial and
standard commercial systems. This meter eliminates the need for
analog charts. It is a hand-held, battery-powered meter, that makes
air flow and velocity measurements with an accuracy of ±2%.
Temperature measurements are made with an accuracy of ±1%.
Features include
• Convenient direct digital readout of actual air flow or velocity with
out using conversion charts
• Large dual digital display for simultaneous air flow or velocity
and temperature measurements
• Air flow and velocity measurements accurate to ±2%
• Temperature measurements accurate to ±1˚F (±0.6˚C)
• Battery saving automatic power off
• Low battery icon
• Data hold function
• MAX/MIN/AVG recording function
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.
WARNING!
Objects striking the fan may damage meter.
C o n t rols and Indicators
1.
ON/OFF RESET
2.
MODE (Select)
• VEL (FPM)
• FREE AREA
• FLOW (CFM)
3.
HOLD ADVANCE
4.
MIN/MAX RECORD Single Print
5.
NEXT DIGIT Multi-point Average
Operating Instructions
Measuring Air Velocity
(Single Point) feet per minute (FPM)
1. Press the
ON/OFF
button to turn the meter on. Every display
feature will appear for a few seconds when the meter is
turned ON.
2. The DAFM2 is ready for use when the LCD displays "vel"
(the default mode) in the upper left corner, and the temperature
appears in the lower right corner (Fig 1).
3. Hold the sensor in front of an air source. The meter will display
Feet Per Minute (FPM) readings.
Displaying a continuous moving average
The DAFM2 has the ability to display a continuous moving average for
up to two hours.
1. Turn the power ON.
2. Place the sensor in front of an air flow source.
3. Press
MIN/MAX
record key once. An AVG in the lower left
corner of the display confirms the meter is in the continuous
moving average measurement mode. The display will update
once per second (Fig 2).
MIN/MAX/AVG (Single Point)
To obtain MIN/MAX/AVG readings on a single point.
1. Turn the meter ON.
2. Place the sensor in front of an air flow source.
1
4
2
5
(Fig 1)
(Fig 2)
DAFM2-MAN
P. 1
