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User Guide
Pin Free Moisture Meter
Model MO280
Introduction
Congratulations on your purchase of the Extech MO280 Moisture Meter.
This device non-invasively measures and displays relative moisture
content in wood, building products, and other materials. The MO280 can
also detect moisture behind ceramic tiles or behind and under various floor
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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 relative moisture content (in %) of the material under
test to a max. depth of 20mm. Moisture that is closer to the surface of the
material under test has a greater effect on the average than moisture
deeper in the material. The MO280 is an auto-calibration device; no user
calibration is needed.
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
Operation
1. Slide the rear power switch to the ON position
2. IMPORTANT: Hold the meter up so that the rear sensor is not covered
by your hand or any surface or object. If the meter emits chirping tones,
the sensor is entirely or partially covered
3. Momentarily press the MEASURE button to activate the sensor (the
LCD display will switch on)
4. Press and hold the UP or DOWN button to select a material group 0 to 9
(see table below). When the desired group is displayed, release the
button. The meter will briefly chirp
5. Firmly press the meter to a smooth flat surface with the sensor side of
the meter (back) touching the material under test and wait for the
display to stabilize; Note the value on the LCD.
6. The meter’s audible tones will sound as the reading changes. A blinking
reading with an urgent chirping sound indicates that the measurement is
out of the range of the instrument’s capability. Try another range by
selecting another material group (see material group & range tables
below)
7. Press the HOLD button to freeze a displayed reading. To unfreeze,
press the HOLD button again.
8. If the meter goes into sleep mode, press the MEASURE button to wake
it up. If the meter does not wake or if the low battery icon appears on the
LCD, replace the 9V battery located in the rear battery compartment
9. Turn the rear power switch to OFF when meter is not in use. This will
optimize the battery life
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).
General Specifications
Max. Measurement depth: 20mm (0.75”)
Sensor area 40 x 40mm (1.6” x 1.6”)
Battery type: 9V (rear compartment)
Display: LCD with sleep mode
Operating conditions: 0
º
C to 50ºC (32ºF to 122ºF)
0 to 60%RH (non-condensing)
Meter Dimensions: 70 x 133 x 25.4mm (2.75x 5.25x
1.0”)
Weight: 160g (5.6 oz) with battery
Battery Replacement
You, as the end user, are legally bound (Battery ordinance) to
return all used batteries and accumulators; disposal in the
household garbage is prohibited!
You can hand over your used batteries / accumulators, gratuitously,
at the collection points for our branches in your community or
wherever batteries / accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the
disposal of the device at the end of its lifecycle
Cautions
This device is not a toy and must not reach children’s hands. It contains
hazardous objects as well as small parts that the children could swallow.
In case a child swallows any of them, please contact a physician
immediately
Do not leave the battery and packing material lying around unattended;
they can be dangerous for children if they use them as toys
In case the device is going to be unused for an extended period of time,
remove the battery to prevent them from draining
Expired or damaged batteries can cause cauterization on contact with the
skin. Always, therefore, use suitable hand gloves in such cases
See that the battery is not short-circuited. Do not throw the battery into a
fire.
Wood and Material Group Numbers
Measurement at 73oF (23oC)
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/Particle board
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%
Copyright © 2013 FLIR Systems, Inc.
All rights reserved including the right of repr oduction in whole or in part in any form.
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MO280-EU-EN V4.4 12/13
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