Extech MO280 Manual

Extech Måling MO280

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MO280-EU V3.0 06/08

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 moisture content (%) in wood,

building products, and other materials. The MO280 can also detect moisture

behind ceramic tiles or behind and under various oor 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

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: 0ºC 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

4 Mahogany

5 Maple, Bigleaf

6 Maple, Red

5 Maple, Sugar

4 Meranti

5 Oak Red

4 Oak, White

4 Pecan

6 Pine Eastern White

6 Ponderosa

4 Red

3 Southern Yellow

5 Poplar

4 Ramin

3 Redwood

4 Rosewood

7 Sassafras

5 Spruce

5 Sycamore

5 Teak

4 Walnut, Black

7 Willow

5 Cloth

5 Cotton

3 Dry wall

5 Fabric

4 Paper

6 Locust, Black 5 Plywood

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%

form.

Produkt Specifikationer

Mærke:	Extech
Kategori:	Måling
Model:	MO280

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