User's Manual
CFM Thermo Anemometer
Air Velocity, Air Flow, and Temperature
Model 407114
Introduction
Congratulations on your purchase of the Extech CFM Thermo Anemometer.
This instrument measures Air Velocity, Air Flow (volume) and Temperature.
The RS-232 PC interface provides data acquisition functionality. Proper use of
this meter will provide years of reliable service.
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Model 407114 Version 2.0 November 2005
Specifications
General Specifications
Circuit
Custom LSI microprocessor circuit
Display
Measurement units
Data hold
Sampling rate
Sensors
Dual function 0.5" (13 mm) 4-digit LCD
Air Velocity: m/s, km/h, ft/min, knots, mph;
3
3
Air Flow: CMM (m /min); CFM (ft /min); Temp: °C & °F
Freezes displayed reading
1 reading per second approx.
Air velocity/flow sensor: Conventional angled vane arms
with low-friction ball bearing.
Temperature sensor: Precision thermistor
Record and view Maximum and Minimum readings
Auto shut off after 15 minutes to preserve battery life
RS 232 PC serial interface with 16-bit data stream
32°F to 122°F (0°C to 50°C)
Max. 80% RH
9V battery
Approx. 8.3 mA DC
0.84 lbs. (381g) including battery & probe
Main instrument: 7.1 x 2.8 x1.3" (180 x 72 x 32mm)
Sensor Head: 72mm Diameter
MAX/MIN Memory
Automatic Power off
Data Output
Operating Temperature
Operating Humidity
Power Supply
Power Current
Weight
Dimensions
Range Specifications
Air Velocity
m/s (meters per sec)
km/h (kilometers/hour)
ft/min (feet per minute)
mph (miles per hour)
knots (nautical MPH)
Air Flow
CMM (cubic meters/min)
CFM (cubic ft/min)
Air Temperature
Range
0.40 - 25.00 m/s
1.4 - 90.0 km/h
80 – 4921 ft/min
0.9 – 55.9 mph
0.8 to 48.6 knots
Range
0-999,900 m
3
/min
0-999,900 ft
3
/min
Range
o
o
32 - 122 F (0 - 50 C)
Resolution
0.01 m/s
0.1 km/h
1 ft/min
0.1 mph
0.1 knots
Resolution
0.001 to
100
0.001 to
100
Resolution
0.1
o
F/C
Accuracy
(% rdg)
± (2% + 0.2 m/s)
± (2% + 0.8 km/hr)
± (2% + 40 ft/m)
± (2% + 0.4 MPH)
± (2% + 0.4 knots)
Area
0 to 9,999m
0 to 9,999ft
2
2
Accuracy
1.5 F (0.8 C)
o
o
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Model 407114 Version 2.0 November 2005
Meter Description
1. Sensor plug. Can be inserted in the
sensor jack from only one direction.
Ensure proper orientation before
exerting force to plug in the sensor.
2. PC Interface jack (RS-232). For
use with the interface cable
provided in the optional 407001 PC
Data Acquisition kit.
3. LCD Display for Air Velocity, Air
Flow, and Temperature. Units of
measure and user alerts are also
displayed on the LCD.
4. Vane Sensor. Hold the sensor in
the flow of air to initiate a reading.
5. Protective rubber holster. Must be
removed to access the rear battery
compartment.
6. Keypad (see below)
•
POWER
Press to turn the
meter ON or OFF
•
HOLD
Press to freeze the
displayed reading. Press again
to unlock display
•
C/F
Press to select the unit of measure for Temperature readings
•
RECORD/RECALL
Used to store the highest, lowest, and average readings for
later recall. Refer to the Operation section of this manual for more details. This
button also functions as the DECIMAL point when programming.
•
UNIT
Press to select the unit of measure for Air Velocity. This button also
functions as the DOWN ARROW button when programming
•
FLOW/VELOCITY
Press to select the mode of operation. In FLOW mode, the
meter displays air
volume.
In VELOCITY mode, the meter displays air
speed.
•
RIGHT Arrow button. Used when programming.
UP Arrow button. Used when programming.
•
•
FLOW MODE
Press to select the Normal, AVG, or 2/3 MAX Air Flow operational
mode. Refer to the Operation section of this manual for more details.
•
AVG/START
In the FLOW mode, press to store a reading in the AVERGGE utility.
Up to 20 readings can be averaged. Refer to the Operation section of this manual
for more details.
•
ENTER/RESET
Used in the Flow mode while entering the duct area. Refer to the
Operation section of this manual.
•
AREA
Used when manually entering the area of a duct. Refer to the Operation
section of this manual.
7. Battery compartment located on the back of the instrument. The rubber protective
jacket must be removed from the meter to access the compartment.
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Model 407114 Version 2.0 November 2005
Operation
Air Velocity Measurements
1. Connect the sensor to the sensor input jack on top of the meter.
2. Turn on the meter using the POWER button.
3. Select the VELOCITY function using the VEL/FLOW button. The LCD will display
VEL
when the velocity mode is selected.
4. Select the desired temperature units using the C/F select button. The LCD will reflect
the current unit selection.
yellow
5. Select the desired air velocity units using the UNIT
dot
button. The LCD will reflect the current unit selection.
6. Place the sensor in the air current with the yellow dot
on the exhaust side of the vane (see diagram)
7. View the air velocity and temperature readings on the
LCD Display. The large main LCD display shows the
Air Velocity reading. The lower LCD sub-display shows
the temperature reading.
airflow
Data Hold Feature
1. While taking measurements, press the HOLD button to freeze the LCD reading for later
viewing.
2. The
DH
indicator will appear on the LCD when the display is in Data Hold mode.
3. Press HOLD again to return to normal operation.
Maximum and Minimum Recording
The 407114 allows the user to record and view the highest (MAX) and lowest (MIN)
readings.
1. Press the RECORD/RECALL button once. The
REC
indicator will appear on the
display and the meter will begin keeping track of the MAX and MIN values.
2. To view the MAX reading, press RECORD/RECALL again. The
MAX
indicator along
with the maximum reading will appear on the LCD display.
3. Press RECORD/RECALL again to view the minimum value, the
MIN
indicator along
with the minimum reading will appear on the LCD display.
4. To return to normal operation, press and hold the RECORD/RECALL button for
approx. 3 seconds. The display indicators
REC, MAX,
and
MIN
will disappear.
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Model 407114 Version 2.0 November 2005
京公网安备 11010802033920号
EEWORLD
