Extech Instruments MO220 Manual de usuario

User Guide

Moisture Meter

Model MO220

MO220 V1..2 4/10

Introduction

Congratulations on your purchase of the Extech MO220 Moisture Meter. This instrument is

a conductivity moisture meter specifically designed for the wood industry.

The instrument has eight calibration scales, enabling the user to take accurate moisture

measurements in 170 wood species. Moisture measurements can be taken using the

integral pin electrodes, or using the heavy duty moisture probe.

When used with the temperature probe, the moisture measurements are automatically

corrected with respect to temperature. This meter is shipped fully tested and calibrated

and, with proper use, will provide years of reliable service.

MO220 V1..2 4/10

Specifications

Display Dual measurement scale LCD with bargraph metering

Measurement principle Electrical resistance

Range Wood: 6 to 44%

Electrode length 0.3” (8mm)

Electrode pins Integrated, replaceable

Auto Power OFF After approx. 15 minutes

Power supply Two (2) ‘AAA’ 1’5V batteries

Meter housing Impact-proof plastic

Operating Temperature 32 to 104oF (0 to 40oC)

Operating Humidity 85% Relative Humidity maximum

Dimensions 5.1 x 1.6 x 1.0” (130 x 40 x 25mm)

Weight 3.5 oz. (100g)

Description

Meter Description

1. Measurement pins

2. Low battery icon

3. LCD measurement reading

4. Wood group designators

5. Units of measure

6. External moisture sensor input

7. Remote temperature probe jack

8. Temperature units button

9. Wood group letter selector button

10. Power ON-OFF button

Note that the battery compartment is

located on the rear of the instrument.

MO220 V1..2 4/10

Operation

Basic Measurement Instructions

1. Remove the cap to expose the needle electrodes OR connect the heavy duty moisture

probe socket on the right hand side of this instrument

2. Switch the meter ON by pressing the button.

3. Select the appropriate wood calibration scale A, B, C, E, F, G, H or J (see the Wood

Calibration Tables later in this guide) using the button.

4. Push the needle pins or the heavy duty moisture probe pins into the wood and observe

the reading.

5. Press and hold the power button to shut the meter off.

Manual Temperature Correction (for use without the Temperature Probe)

The instrument is calibrated for wood at 68°F (20°C). In general, wood that is warmer than

68°F (20°C) will give higher readings and wood colder than 68°F (20°C) will give lower

readings. An approximate manual correction of 0.5% moisture content per 9°F (5°C) may

be subtracted from wood that is above 68°F (20°C). For wood that is below 68°F (20°C), a

manual correction of 0.5% moisture content per 9°F (5°C) may be added to the measured

value.

Automatic Temperature Correction ATC (for use with the Temperature Probe)

1. Switch the instrument on and select the appropriate wood calibration scale as detailed

earlier.

2. Using a hammer and nail of a nominal 3 mm diameter, make a hole in the wood to be

tested.

3. Remove the nail and push the Temperature Probe into the hole until the tip is at the

required depth.

4. Connect the Temperature Probe into the instrument via the Temp socket.

5. Measure the wood as described earlier to obtain the automatically temperature

corrected (ATC) moisture value.

6. To read the current temperature of the wood press the Tbutton, the LCD will display

the temperature.

7. Press the Tbutton again to change the C/F unit of measure.

8. Press the button to display moisture value again.

Auto Power OFF

The meter can automatically turn itself off after several minutes. This is to conserve on

battery energy. The user can select the period of time the meter must remain idle before

turning itself off (1 through 9 minutes). The user can also elect to disable the automatic

power off feature (select 00).

1. With the meter ON, simultaneously press the power and the right arrow

buttons. The current time period will appear.

2. While continuing to hold the power button, use the right arrow button to select

the desired time period. Select ‘00’ to disable this feature.

3. Release both buttons when the desired value is on the LCD.

CAUTION: The electrode measurement pins are extremely sharp. Use

care when handling this instrument. Cover the pins with the protective cap

when the instrument is not in use.

MO220 V1..2 4/10

Manual Accuracy Check

There are two (2) sets of calibration poles located inside the meter’s protective cover.

One set is for the 18% calibration and the other is for the 26% calibration, as marked

inside the cover.

When checking the calibration, the A scale should be selected and the temperature

probe must be disconnected.

Touch the two measurement pins to the 18% calibration nodes and view the

measurement on the meter display. Do the same for the 26% calibration.

When correctly calibrated, the instrument will register %H2O values in the range of

17.7 to 18.3 (18% calibration) and in the range of 25.5 to 26.5 (26% calibration).

If the tolerance exceeds ±1 the instrument must be recalibrated.

Care and Maintenance

When the instrument is not in use, keep it in its pouch together with its accessories. Store

the kit in a stable, dust-free environment out of direct sunlight. Remove the batteries from

the instrument if it is to be stored for periods of more than one month, or when the low

battery power symbol appears on the display. Check the condition of accessories used

with the instrument on a regular basis and replace them if they become worn or damaged.

Battery replacement

When the low battery icon appears on the display, replace the battery as soon as practical.

1. Remove the rear battery compartment screw.

2. Remove the battery compartment door

3. Replace the two (2) ‘AAA’ 1’5V batteries

4. Replace the compartment door and secure the screw before using the meter.

MO220 V1..2 4/10

Calibration Tables for Wood

Wood Species Group Tables

Common names of wood (BS-888 & 589:1973)

Wood Species Group

Abura E

Afara A

Aformosa G

Afzelia E

Agba J

Amboyna G

Ash, American B

Ash, European A

Ash, Japanese A

Ayan C

Baguacu, Brazilian F

Balsa A

Banga Wanga A

Basswood G

Beech, European C

Berlina B

Binvang E

Birch, European J

Birch, Yellow A

Bisselon E

Bitterwood F

Blackbutt C

Bosquiea A

Boxwood, Maracaibo A

Camphorwood, E African C

Canarium, African B

Cedar, Japanese B

Cedar, West Indian J

Cedar, Western Red C

Cherry, European J

Chestnut C

Coachwood G

Cordia, American Light F

Cypress, E African A

Cypress, Japanese (8-18%mc) J

Cypress, Japanese

(18-28%mc) C

Dahoma A

Danta C

Douglas Fir B

Elm, Japanese Grey Bark B

Elm, English E

Elm, Rock E

Elm, White E

Empress, Tree J

Erimado F

Fir, Douglas B

Fir, Grand A

Fir, Noble J

Gegu, Nohor H

MO220 V1..2 4/10

Wood Species Group

Greenheart C

Guarea, Black J

Guarea, White H

Gum, American Red A

Gum, Saligna B

Gum, Southern B

Gum, Spotted A

Gurjun A

Hemlock, Western C

Hiba J

Hickory F

Hyedunani B

Iroko F

Ironbank B

Jarrah C

Jelutong C

Karpur A

Karri A

Kauri, New Zealand E

Kauri, Queensland J

Keruing F

Kuroka A

Larch, European C

Larch, Japanese C

Larch, Western F

Lime E

Loliondo C

Mahogany, African J

Mahogany, West Indian B

Makore B

Mansoia B

Maple, Pacific A

Maple, Queensland B

Maple, Rock A

Maple, Sugar A

Matai E

Meranti, Red (dark/light) B

Meranti, White B

Merbau B

Missanda C

Muhuhi J

Muninga G

Musine J

Musizi J

Myrtle, Tasmanian A

Naingon C

Oak, American Red A

Oak, American White A

Oak, European A

Oak, Japanese A

Oak, Tasmanian C

Oak, Turkey E

Obeche G

Odoko E

MO220 V1..2 4/10

Wood Species Group

Okwen B

Olive, E African B

Olivillo G

Opepe H

Padang A

Padauk, African F

Panga Panga A

Persimmon G

Pillarwood F

Pine, American long leaf C

Pine, American pitch C

Pine, Bunya B

Pine, Caribbean Pitch C

Pine, Corsican C

Pine, Hoop C

Pine, Huon B

Pine, Japanese Black B

Pine, Kauri E

Pine, Lodgepole A

Pine, Maritime B

Pine, New Zealand White B

Pine, Nicaraguan Pitch C

Pine, Parana B

Pine, Ponderosa C

Pine, Radiata C

Pine, Red B

Pine, Scots A

Pine, Sugar C

Pine, Yellow A

Poplar, Black A

Pterygota, African A

Pyinkado E

Queensland Kauri J

Queensland Walnut C

Ramin G

Redwood, Baltic (European) A

Redwood, Californian B

Rosewood, Indian A

Rubberwood H

Santa Maria H

Sapele C

Sen A

Seraya, Red C

Silky Oak, African C

Silky Oak, Australian C

Spruce, Japanese (8-18%mc) J

Spruce, Japanese (18-28%mc) C

Spruce, Norway (European) C

Spruce, Sitka C

Stringybark, Messmate C

Stringybark, Yellow C

Sterculia, Brown A

Sycamore F

Tallowwood A

MO220 V1..2 4/10

Wood Species Group

Teak F

Totara E

Turpentine C

Utile J

Walnut, African J

Walnut, American A

Walnut, European C

Walnut, New Guinea B

Walnut, Queensland C

Wawa G

Wandoo J

Whitewood C

Yew C

MO220 V1..2 4/10

Botanical Names of Wood

Wood Type Grp

Abies alba B

Abies grandis A

Abies procera J

Acanthopanex ricinifolius A

Acer macrophyllum A

Acer pseudoplatanus F

Acer saccharum A

Aetoxicon punctatum G

Aformosia elata G

Afaelia spp E

Agathis australis E

Agathis palmerstoni J

Agathis robusta J

Amblygonocarpus andgensis A

Amblygonocarpus obtusungulis A

Araucaria angustifolia B

Araucaria bidwilli B

Araucaria cunninghamii

Berlinia grandiflora B

Berlinia spp B

Betula alba J

Betula alleghaniensis J

Betula pendula J

Betula spp J

Bosquiera phoberos A

Brachylaena hutchinsii J

Brachylaena spp B

Calophyllum brasiliense H

Canarium schweinfurthii B

Cardwellia sublimes C

Carya glabra F

Cassipourea elliotii F

Cassipourea melanosana F

Castanea sutiva C

Cedrea odorata J

Ceratopetalum apetala G

Chamaecyparis spp (8-18%mc) G

Chamaecyparis spp (18-28%mc) C

Chlorophora excelsa F

Cordial alliodora F

Corton megalocarpus J

Cryptomelia japonica B

Cupressus spp A

Dacryium franklinii B

Dalbergia latifolia A

Diospyros virginiana G

Dipterocarpus (Keruing) F

Dipterocarpus zeylanicus A

Distemonanthus benthamianus C

Dracontomelium mangiferum B

Dryobanalops spp A

Dyera costulata C

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