General-tools-and-instruments DCFM8906 v.1 Manual do Utilizador Página 1

Please read this manual carefully and thoroughly before using this product.DIGITAL ONE PIECE AIRFLOW METER WITH CFM DISPLAYUSER’S MANUALDCFM8906

DIRECTION OF AIRFLOWFig. 2. The meter’s default initial display after beingpowered onTo make an air speed measurement, place the meter in theairstream

To change the Imperial air speed measurement unit fromft/m to miles per hour (mph) or knots, use the SEL: MPHKNOTS button. Press the button once and t

• The minimum air speed recorded since the sessionbegan• The maximum air speed recorded since the sessionbeganThese three air speed readings can be ve

MIN/MAX REC SINGLE-POINT button will delete thatindication, but not REC. This signifies that the meter is stillrecording, but now displaying real-time

make a performance measurement inside an HVAC/R duct. A multi-point average air speed reading is inherently morerepresentative of a system’s output th

Once the lower display resumes showing temperature andthe Hold indication disappears, make and store another airspeed measurement at a second point by

readings on the upper readout—without clearing the meter’smulti-point memory, press the HOLD button. To clear themulti-point memory, press and hold th

Fig. 7. The initial display produced by pressing the MODEbuttonThe value you need to enter is the area of the grille orregister. Inspect the grille or

To display the real-time airflow volume measurementassociated with a real-time air speed measurement at asingle point, press the MODE button. Note tha

SINGLE-POINT button advances the display to the next stepin a four-step cycle comprising average, real-time, minimumand maximum measurements.To exit r

2TABLE OF CONTENTS Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Key Features . . . . . . . . . . . . . . . . .

SWITCHING BETWEEN IMPERIAL AND METRIC UNITSIf you prefer to display the meter’s air speed and airflowvolume measurements in metric units and its tempe

To finish changing the default settings to metric and Celsiusunits:• Press the HOLD button to make the ft/m and °Findications disappear, leaving only

In metric mode, the only airflow volume unit available is cms(an abbreviation of cubic meters per second, or m3/sec).Pressing the SEL: MPH KNOTS butto

To disable the auto power off function, you must power themeter off and then power it on in the following special way.Press and hold the HOLD button w

SPECIFICATIONSAir Speed Measurement Range 80 to 5900 ft/m (0.4 to 30 m/sec)Air Speed Measurement Accuracy ±3% of full-scale readingSa

MAINTENANCE TIPSIf the display begins to flash or is blank in response topressing the ON-OFF RESET button, replace the battery byfollowing the Setup I

Acceptance of the exclusive repair and replacement remediesdescribed herein is a condition of the contract for purchase ofthis product. In no event sh

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GENERAL TOOLS & INSTRUMENTS80 White StreetNew York, NY 10013-3567PHONE (212) 431-6100FAX (212) 431-6499TOLL FREE (800) 697-8665e-mail: sales@gener

3INTRODUCTIONThank you for purchasing General Tools & Instruments’DCFM8906 Digital One Piece Airflow Meter with CFM Display.Please read this user’

4KEY FEATURES• Measures and displays air speed and airflow volume inImperial or metric units• Simultaneously displays temperature in °F or °C• One-han

5Fig. 1. The DCFM8906’s controls and indicatorsCONTROL BUTTONSON-OFF RESET Turns meter on and off When pressed with AVERAGE button, resets d

MODE VELOCITY FREE AREA FLOW When pressed, places meter in airflow volume measurement mode Used with HOLD and AVERAGE buttons to ente

MIN/MAX REC SINGLE-POINT When pressed once, meter begins recording air speed at a single point. Default display is average air speed

ft2 Square feet. Lit during entry of free area dimensions inImperial modem2 Square meters. Lit during entry

SETUP INSTRUCTIONSINSTALL BATTERYThe meter’s battery compartment is accessible from the backof the unit. Use a Philips-head screwdriver to remove the