Extech Instruments 407777 User manual

User's Guide

Heavy Duty Wood Moisture Meter

Model 407777

Introduction

Congratulations on your purchase of the Extech 407777 Wood Moisture Meter. This meter

measures the moisture content of wood as a percentage. Measurements are made using

the supplied remote intrusive sensor. Careful use of this meter will provide years of reliable

service.

Model 407777 Version 2.2 Jan 04

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 (click on ‘Contact Extech’ and go to ‘Service Department’ to request an

RA number). 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.

Specifications

General Specifications

Circuit Custom one-chip LSI microprocessor circuit

Display Dual function 2000 count (0 to 1999) LCD display

Measurement Range 9% to 30% Moisture Content

Memory Table 9 memory groups for approx. 150 species of wood

Data Hold Front panel push-button freezes displayed reading

Sample Rate Approx. 0.8 seconds

Sensor Structure Remote two-prong intrusive sensor

Memory Record / Recall Records Maximum/Minimum readings for later recall

Auto Power off Meter automatically shuts off after 10 minutes

Data Output RS-232 PC serial interface for use with Model 407001 data

acquisition software and interface cable kit

Operating Temperature 32°F to 122°F (0°C to 50°C)

Operating Humidity 90% Relative Humidity (max.)

Power Supply 9V battery

Power Current Approx. 5.8mA DC

Weight 0.73 lbs (330g) (including batteries & probe)

Size Main instrument: 7.1 x 2.8 x1.3" (180 x 72 x 32 mm)

Probe: 0.9” (23mm) diameter x 6.54" (23mm) length

Accessories Spare pins (10) and protective rubber holster

Range Specifications

Measurement Range Resolution Accuracy

Moisture content 9 to 30% 0.1 % ± (4% + 5d)

Temperature compensation: 32°F to 122°F (0°C to 50°C)

Model 407777 Version 2.2 Jan 04

Meter Description

1. Sensor input: Use caution when inserting the sensor.

2. PC interface jack: For use with Model 407001 software and interface cable kit

3. LCD Display: Displays moisture content, temperature compensation, units of

measure, and function symbols

4. Push-buttons (see below):

•Power: Turn meter on and off

•Hold: Freeze displayed reading

•Material: Select material group 1 through 9 (see Table in the Appendix)

•Record: Track the highest (MAX) and lowest (MIN) readings

•Recall: Review the MAX and MIN readings

•Calibration and ‘+’: Used to calibrate the meter (refer to the calibration section)

•Temperature Adjust: Used for temperature compensation function (refer to

temperature compensation section in this manual)

5. Battery compartment (back): Remove the rubber protective holster to access the

rear battery compartment

6. Protective holster: Rubber jacket insulates meter

7. Sensor pins: Replaceable sensor tips

8. Sensor handle: Hold the sensor by the handle when taking measurements

Model 407777 Version 2.2 Jan 04

Preparation

1. Insert the sensor into the sensor input jack on the meter top

2. Ensure that a fresh 9V battery is installed by powering the unit, observing that the

LCD illuminates, and that the low battery indicator LBT is off. To access the rear

battery compartment, the meter’s protective rubber jacket must be removed.

3. Remove the rubber pin protector from the sensor pin tips before use.

4. Note that this meter automatically turns off after 10 minutes to conserve battery life.

To defeat this feature, press the RECORD key to access the data recording mode. In

the recording mode, the automatic power off feature is disabled. For more on the

recording mode, refer to the section ‘Maximum and Minimum Record and Recall’ later

in this manual.

Wood Moisture Measurements

Wood moisture measurements for known wood type

1. Press the POWER button to turn on the meter.

2. Use the Material button to select a wood group (refer to the material list in the

Appendix later in this manual). Select group 1 through 9 for general woods or Group 9

for chipboard.

3. Insert the sensor's test pins into the wood under test.

4. Insertion should be to at least a 0.08” (2mm) depth for highest accuracy. If this is not

possible, carefully insert the test pins as far as possible without using undue force.

5. The meter display will now indicate moisture content in %.

6. If the moisture content is greater then 30% the display will indicate dashes at the top

of the LCD display ( ).

7. If the moisture content is less than 9% the display will indicate dashes along the

bottom of the LCD display ( _ _ _ _ _ ).

Wood moisture measurements for unknown wood type

Note that this method is used for reference only. Measurements of known wood types have

a higher accuracy than measurements of unknown wood types.

1. Turn ON the meter.

2. Select Material Group 1 using the Material select button.

3. Insert the sensor's test pins into the material under test.

4. Insertion should be to at least a 0.08" (2mm) depth. However, if this is not possible,

carefully insert the test pins as far as possible without using undue force.

5. The meter display will now indicate moisture content in %.

Model 407777 Version 2.2 Jan 04

Wallboard Moisture Measurements

Unlike wood types which have known densities, wallboard does not. Consequently it is not

possible to get an absolute moisture content reading.

The following procedure can be used to make relative or comparative measurements of

the moisture content in wallboard.

1. Turn ON the meter.

2. Select Material Group 1 by pressing the Material Select button.

3. Insert the sensor's test pins into a known dry area of wallboard. Insertion should be to

at least a 0.08" (2mm) depth. The meter display will now indicate moisture content in

%. Note this ‘dry’ reading.

4. Insert the sensor's test pins into the wallboard under test. Insertion should be to at

least a 0.08" (2mm) depth. The meter display will now indicate moisture content in %.

Note this ‘moist’ reading.

5. Compare the ‘dry’ wallboard reading with the ‘moist’ wallboard reading to determine the

moisture content of the wallboard area under test.

Temperature Compensation

This meter is calibrated for use at ambient temperature: 68oF (20oC). When the

temperature is above or below this value, manual temperature compensation should be

performed to maintain meter measurement accuracy. Follow these steps:

1. Check that the RECORD function is not engaged (‘REC’ display icon is off).

2. Use the TEMPERATURE ADJUST buttons to increase (left button) or decrease (right

button) the temperature display to match the new temperature (in oC). The

temperature is adjustable in 1 degree steps.

3. The value will be stored after 4 seconds. Temperature compensation adjustments are

not stored in memory when the meter is turned OFF however.

Data Hold

To freeze the LCD display reading, press the HOLD key. The 'DH' icon will appear on the

LCD. Press the HOLD key again to return to normal operation (the 'H' hold icon will switch

OFF).

Maximum (MAX) and Minimum (MIN) Record and Recall

To keep track of the highest (MAX) and lowest (MIN) measurements, follow the procedure

below:

1. Press the RECORD button to begin tracking the highest and lowest readings. The REC

display icon will appear on the LCD.

2. Press the RECALL key when it is desired to view the highest reading since the

RECORD button was pressed. The MAX icon will appear on the display and the

reading shown will be the highest reading encountered since the RECORD key was

pressed.

3. Press the RECALL key again to view the lowest reading (MIN).

4. To exit this mode of operation, press the RECORD key again. The REC, MAX, and

MIN icons will switch off.

Model 407777 Version 2.2 Jan 04

Battery Replacement

When the low battery indicator LBT appears, the 9V battery should be replaced.

1. Remove the rubber protective holster that surrounds the meter.

2. Remove the battery compartment cover, located on the lower back of the meter, with a

coin or a flathead screwdriver.

3. Replace the 9V battery.

4. Close the battery compartment and affix the protective holster.

RS-232 PC Interface

The Meter includes a PC interface for use with optional Data Acquisition Software and

interface cable kit (Part Number 407001). Operational instructions for the interface and

software are supplied with the optional interface kit.

Calibration

Calibration Verification

1. Ensure that the RECORD function is not engaged (REC icon is not on the LCD).

2. Select Material Group 1 using the Material Select button.

3. Press and hold both the CALIBRATION and the “+“ buttons.

4. The display will begin to count down from 5 to 1.

5. If the meter's existing calibration is correct, the LCD will display "good"

6. If the meter's existing calibration is incorrect, the LCD will display "Err".

7. If the calibration is incorrect follow the steps in the next section to recalibrate.

Calibration Procedure

1. Remove the Meter's protective rubber holster.

2. Select Material Group 1 via the Material Select button.

3. Remove the rear battery compartment cover and locate the VR1 potentiometer that sits

inside the battery compartment on the left side.

4. Press and hold the “+” Calibration button.

5. Adjust VR1 for a display of "18.0".

Model 407777 Version 2.2 Jan 04

Appendix - Table of Material Groups (alphabetized) with Group Numbers

Abura 4 Erimado 5 Meranti, Red (light or

dark) 2 Pine, Ponderosa 3

Afara 1 Fir, Douglas 2 Meranti, white 2 Pine, Radiata 1

Afrormosia 6 Fir, Grand 1 Merbau 2 Pine, Carribean,

pitch 3

Afzelia 4 Fir, Noble 8 Missanda 3 Poplar, Black 1

Agba 8 Gegu, Nohor 7 Muhuhi 8 Pterygota, African 1

Amboyna 6 Greenheart 3 Muninga 6 Pyinkado 4

Ash. European 1 Guarea, Black 8 Musine 8 Queensland

Walnut 3

Ash. Japanese 1 Guarea, White 7 Musizi 8 Queensland Kauri 8

Ash. American 2 Gum, American Red 1 Myrtle, Tasmanian 1 Ramin 6

Ayan 3 Gum, Saligna 2 Niangon 3 Redwood, Baltic

(Europe) 1

Baguacu, Brazilian 5 Gum, Southern 2 Oak, Japanese 1 Redwood,

Californian 2

Balsa 1 Gum, Spotted 1 Oak, Tasmanian 3 Redwood, Baltic

(Europe) 1

Bange Wanga 1 Gurjun 1 Oak, Turkey 4 Rosewood, Indian 1

Basswood 6 Hemlock, Western 3 Oak, American Red 1 Santa Maria 7

Bech, European 3 Hickory 5 Oak, American white

1 Sapele 3

Berlina 2 Hyedunani 2 Oak, European 1 Seraya, Red 3

Binvang 4 Iroko 5 Obeche 6 Silky Oak, African 3

Birch, European 8 Ironbank 2 Odoko 4 Silky Oak,

Australian 3

Birch, Yellow 4 Jarrah 3 Okwen 2 Spruce, Norway

(European) 3

Bisselon 4 Jelutong 3 Olive E. African 2 Spruce, Sitka 3

Bitterwood, 5 Kapur 1 Olivillo 6 Sterculia, Brown 1

Blackbutt 3 Karri 1 Opepe 7 Stringybar, Yellow 3

Bosquiea 1 Kauri, New Zealand 4 Padang 1 Stringybark,

Messmate 3

Boxwood, Maracaibo 1 Kauri, Queensland 8 Padauk, African 5 Sycamore 5

Cahoma 1 Keruing 5 Panga Panga 1 Tallowwood 1

Camphorwood, E.

African 3 Kuroka 1 Persimmon 6 Teak 5

Canarium, African 2 Larch, European 3 Pillarwood 5 Totara 4

Cedar, West Indian 8 Larch, Japanese 3 Pine, Maritime 2 Turpentine 3

Cedar, Western Red 3 Larch, Western 5 Pine, Nicaraguan

Pitch 3 Utile 8

Cherry, European 8 Lime 4 Pine, American Long

Leaf 3 Walnut

Queensland 3

Chestnut 3 Loliondo 3 Pine, Corsican 3 Walnut, European 3

Chipboard 9 Mahogany, West

Indian 2 Pine, Yellow 1 Walnut, African 8

Coachwood 6 Mahogany, African 8 Pine, Hoop 3 Walnut, N. Guinea 2

Cordia, American light 5 Makore 2 Pine, Kauri 4 Walnut, American 1

Cypress, E. African 1 Mansonia 2 Pine, Huon 2 Wandoo 8

Danta 3 Maple, Pacific 1 Pine, Scots 1 Wawa 6

Douglas Fir 2 Maple, rock 1 Pine, Lodgepole 1 Whitewood 3

Elm, English 4 Maple, Queensland 2 Pine, Sugar 3 Yew 3

Elm, Rock 4 Maple, Sugar 1 Pine, New Zealand,

White 2

Elm, White 4 Matai 4 Pine, Parana 2

Model 407777 Version 2.2 Jan 04



Support Hotline (781) 890-7440

Tech support: Ext. 200; Email: [email protected]

Repair/Returns: Ext. 210; Email: [email protected]

Website: www.extech.com

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.

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