User's Guide
EzFlex™ Thermo-Anemometer
Model EZ30
VEL
MAX MIN AVG
UNITS
˚
˚
Introduction
Congratulations on your purchase of the Extech EZ30 Thermo-Anemometer. The EZ30
measures air velocity in five units of measure: feet per minute (ft/min), meters per
second (m/sec), miles per hour (MPH), kilometers per hour (km/hr), & nautical miles per
hour (knots). An internal Type K sensor allows the EZ30 to measure air temperature in
Celsius or Fahrenheit units. The 16” (406mm) flexible gooseneck provides easy access
for air velocity and temperature measurement in difficult to reach locations. This meter is
shipped fully tested and calibrated and with proper use will provide years of reliable
service.
Meter Description
1. LCD display
2. Vane sensor
3. Hold/Backlight key
4. Units/°F/°C key
5. Max/Min key
6. On/Off key
Note: Battery compartment is on rear of unit
Display
1. MAX MIN Record mode
2. Temperature display
3. Temperature display
4. Velocity units
5. Hold mode
6. MAX or MIN mode
7. Velocity display
8. Low battery indicator
VEL
6
5
MAXMIN AVG
UNITS
4
1
8
VEL
2
7
MAX MIN
6
12
˚
˚
3
3
˚
˚
5
4
Model EZ30 Version 1.1 04/06 2
Operation
Meter Power
1. Press the POWER button to turn the meter on. If the display does not switch on, check
that a fresh 9V battery is installed.
2. Press the POWER button to turn the meter off.
3. The meter is equipped with an AUTO POWER OFF feature. The meter automatically
shuts off after 15 minutes to conserve battery energy. To disable this feature, hold
down the UNITS key while turning the meter on. “disAPO” will appear in the display to
indicate that Auto Power Off has been disabled.
Measuring Air Velocity and Temperature
1. Place the sensor in the air stream under test.
2. Read the Air Velocity and Temperature measurements directly on the LCD.
3. To calculate Air Volume in CFM (cubic feet per minute) or CMM (cubic meters per
minute) refer to the ‘Useful Equations and Conversions’ section.
Selecting the Temperature unit of measure (
Press and hold the UNITS key for 3 seconds to select the temperature unit of measure.
The meter will beep twice and the display will indicate the currently selected unit of
measure.
Selecting the Air Velocity unit of measure
Press the UNITS key to change the unit of measure for Air Velocity measurements. The
display will reflect the current selection. A list of measurement units is printed in the
specifications later in this manual.
Data Hold/Backlight
To freeze the LCD display, momentarily press the HOLD key. The 'HOLD' icon will appear
on the LCD and the reading will remain unchanged. Momentarily press the HOLD button
again to return to normal operation (the 'HOLD' icon will switch off).
Press and hold the key for 3 seconds to turn the backlight on/off.
Record and Recall MAX / Min Function
1. To begin capturing the Maximum (MAX) and Minimum (MIN) air velocity and
temperature readings, press the MAX/MIN key and the ‘RECORD’ icon will appear in
the display.
2. Now, use the MAX/MIN key to toggle the view from MIN to MAX to RECORD. The
‘MAX’ or ‘MIN’ will appear along with the recalled reading for convenience. In RECORD
mode, the meter will display the current reading but will continue to capture MAX and
MIN readings.
3. To return to normal operation, press and hold
and stop MAX/MIN recording. The meter will beep twice and the ‘MAX’/‘MIN’ and
‘RECORD’ icons will switch off.
oC/o
F)
the MAX/MIN key for 3 seconds to clear
Model EZ30 Version 1.1 04/06 3
Maintenance
Battery Replacement
When the battery power falls low, the low battery icon
the 9V battery by removing the Phillips screw on the battery compartment door and
accessing the battery compartment. Ensure that the compartment cover is securely
fastened when finished.
Cleaning and Storage
Wipe the meter and vane with a damp cloth as needed. Do not apply abrasive, solvents, or
other cleaners to the surface of the meter or vane. Store with the battery removed and
avoid extreme temperature and humidity.
will appear on the LCD. Replace
Specifications
Circuit description Custom LSI microprocessor design
Display Dual function 9999 count LCD display
Measurement units m/s, km/h, ft/min, knots , mph, Temperature: oC/oF
Data hold Freezes reading on the display
Sensor Structure Air velocity sensor: Conventional twisted vane arm with low-
Memory Recall Record and Recall Maximum/Minimum (MAX/MIN) readings
Auto Power off After 15 minutes with disable feature
Operating Temperature 32 °F to 122 °F (0 °C to 50 °C)
Operating Humidity Max. 80% RH
Power Supply 9V battery
Power Consumption Approx. 8.3mA DC
Weight 7.4 oz (210g)
Dimensions Main instrument: 6.42 x 1.77 x1.34” (163 x 45 x 34mm)
Air Velocity Range Specifications
Measurement Range Resolution Accuracy
ft/min (feet per minute) 80 - 5900 ft/min 1 ft/min ± (3% + 40 ft/min)
m/s (meters per second) 0.40 - 30.00 m/s 0.01 m/s ± (3% + 0.20 m/sec)
km/h (kilometers per hour) 1.4 - 108.0 km/h 0.1 km/h ± (3% + 0.8 km/hr)
mph (miles per hour) 0.9 - 67.0 mph 0.1 mph ± (3% + 0.4 mph)
knots (nautical miles per hour) 0.8 - 58.0 knots 0.1 knots ± (3% + 0.4 knots)
Temperature Range Specifications
Range Resolution Accuracy
32oF to 122oF (0oC to 50oC) 0.1oF (0.1oC) ± 4.0oF (2oC)
friction ball-bearing
Temperature sensor: Type K
Sensor Head: 0.7” (17.8 mm) diameter
(% of reading)
Model EZ30 Version 1.1 04/06 4
Useful Equations and Conversions
Volume Measurements
To determine CFM (cubic feet per minute) or CMM (cubic meters per minute) in a duct, the
area of the duct must first be measured (use the equations below). Then multiply an air
velocity measurement by the area measurement to obtain CFM or CMM.
Area equation for rectangular or square ducts
Height (H)
Width (W)
Area equation for circular ducts
Radius
Cubic equations
Unit of Measure Conversion Table
m/s ft/min knots km/h MPH
CFM (ft3/min) = Air Velocity (ft/min) x Area (ft2)
CMM (m
must be converted to feet or meters
3
Area (A) = Width (W) x Height (H)
/min) = Air Velocity (m/sec) x Area (m2) x 60
NOTE: Measurements made in inches
Area (A) =
= 3.14 and r
Where
before using the above formulae.
x r
2
2
= radius x radius
1 m/s 1 196.87 1.944 3.6 2.24
1 ft/min 0.00508 1 0.00987 0.01829 0.01138
1 knot 0.5144 101.27 1 1.8519 1.1523
1 km/h 0.2778 54.69 0.54 1 0.6222
1 MPH 0.4464 87.89 0.8679 1.6071 1
Model EZ30 Version 1.1 04/06 5
Warranty
EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects
in parts and workmanship for one year from date of shipment (a six month limited warranty
applies on sensors and cables). If it should become necessary to return the instrument for
service during or beyond the warranty period, contact the Customer Service Department at
(781) 890-7440 ext. 210 for authorization or visit our website at www.extech.com for
contact information. A Return Authorization (RA) number must be issued before any
product is returned to Extech. The sender is responsible for shipping charges, freight,
insurance and proper packaging to prevent damage in transit. This warranty does not
apply to defects resulting from action of the user such as misuse, improper wiring,
operation outside of specification, improper maintenance or repair, or unauthorized
modification. Extech specifically disclaims any implied warranties or merchantability or
fitness for a specific purpose and will not be liable for any direct, indirect, incidental or
consequential damages. Extech's total liability is limited to repair or replacement of the
product. The warranty set forth above is inclusive and no other warranty, whether written or
oral, is expressed or implied.
Calibration and Repair Services
Extech offers repair and calibration services for the products we sell. Extech also provides
NIST certification for most products. Call the Customer Service Department for information
on calibration services available for this product. Extech recommends that annual
calibrations be performed to verify meter performance and accuracy.
Product specifications subject to change without notice
Copyright © 2006 Extech Instruments Corporation
All rights reserved including the right of reproduction in whole or in part in any form.
Support Hotline (781) 890-7440
Tech support: Ext. 200; Email: support@extech.com
Repair/Returns: Ext. 210; Email: repair@extech.com
For the latest version of this User’s Guide, Software updates, and other
up-to-the-minute product information, visit our website: www.extech.com
Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451
Model EZ30 Version 1.1 04/06 6
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