Product Manual

User’s Guide
Pin Free Moisture Meter Model MO280
MO280 V4.1 209
No. Name No. Name
4 Abachi 4 Mahogany
5 Abura 5 Maple, Bigleaf
6 Afrormosia 5 Maple, Red
5 Agba 6 Maple, Sugar
4 Alder 6 Meranti
5 Ash 6 Oak Red
4 Aspen 7 Oak, White
4 Basswood 7 Pecan
6 Beech 4 Pine Eastern White
6 Birch 4 Ponderosa
4 Cedar, Eastern 5 Red
3 Cedar, Western 4 Southern Yellow
5 Cherry 4 Poplar
4 Chestnut 5 Ramin
3 Cottonwood 4 Redwood
4 Cypress 8 Rosewood
7 Dogwood 5 Sassafras
5 Douglas Fir 4 Spruce
5 Elm 5 Sycamore
5 Gum, Red 5 Teak
4 Hemlock 6 Walnut, Black
7 Hickory 4 Willow
5 Koa 3 Cloth
5 Lauan, White 3 Cotton
3 Lauan, Red 9 Dry wall
5 Larch 3 Fabric
4 Limba 9 Paper
6 Locust, Black 5 Plywood
Introduction
Congratulations on your purchase of the Extech MO280 Moisture Meter.
This device non-invasively measures and displays moisture content (%) in
wood, building products, and other materials. The MO280 can also detect
moisture behind ceramic tiles or behind and under various floor or wall
coverings, on fabric/cloth and on paper products. This professional meter,
with proper care, will provide years of safe reliable service.
Theory of Operation
The square sensor on the rear of the instrument sends and receives a low
power electromagnetic signal through the material under test. The LCD
shows the average moisture content (in %) of the material under test to a
max. depth of ¾” (20mm). The MO280 is an auto-calibration device; no user
calibration is needed.
Operation
Note: When the meter’s display is active, the meter is measuring. If the
meter’s rear power switch is on and the display is blank, the meter is in
sleep mode. Press the MEASURE button to resume measuring.
1. Slide the rear power switch to the ON position
2. Momentarily press the MEASURE button to begin measurements
(the display will switch on)
3. Press the UP or DOWN button to step through and select the
material group (0 to 9) for the material to be tested.
4. Place the meter’s rear sensor (black square) against a flat surface
on the material to be tested.
5. The meter’s audible tones will sound as the meter seeks a stable
reading. A blinking reading with an urgent chirping sound
indicates that the measurement is out of the range for the group
selected.
6. Press and hold
the HOLD button to freeze a displayed reading
7. Turn the rear power switch to OFF when meter is not in use. This
will optimize the battery life
Specifications
Max. Measurement depth: ¾” (20mm)
Sensor area 1.6” x 1.6” (40 x 40mm)
Battery type: 9V (rear compartment)
Display: LCD with sleep mode
Operating conditions: 32
º
F to 122
º
F (0
º
C to 50
º
C)
0 to 60%RH (non-condensing)
Meter Dimensions: 2.75 (W) x 5.25 (H) x 1.0 (D)” (70 x 133 x 25.4mm)
Weight: 5.6 oz (160g) with battery
Description
1. Moisture reading
2. Low battery icon
3. Material group number 0-9
4. Data Hold icon
5. Keypad
Note: Sensor, battery compartment, and ON/OFF
switch on reverse side of meter
Measurement Considerations
The thickness of the sample under test must be at least 3/4”
(20mm). If the sample is thinner, use a stack of samples to
measure. Also, the measurement area of the sample should be
larger than the MO280 sensor area which is 1.6 x 1.6” (40 x
40mm).
Warranty
EXTECH INSTRUMENTS CORPORATION (a FLIR company) 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 to 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 [phone] ext. 210 for authorization or visit our
website 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.
Copyright © 2009 Extech Instruments Corporation (a FLIR company)
All rights reserved including the right of reproduction in whole or in part in any
form.
Wood and Material Group Numbers
Measurement ranges at 73
o
F (23
o
C
Group No. Range
0 23.4 to 79.9%
1 33.4 to 89.9%
2 43.4 to 99.9%
3 6.8 to 63.3%
4 6.7 to 63.2%
5 5.4 to 61.9%
6 3.4 to 59.9%
7 1.6 to 58.1%
8 0.4 to 56.9%
9 0.0 to 56.5%
Support line [phone]
Tech Support: Ext. 200; E-mail: [e-mail]
Repair/Returns: Ext. 210; E-mail: [e-mail]
www.extech.com
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