General MMD900 Manual de usuario

PIN/PINLESS DEEP SENSING

MOISTURE METER

WITH REMOTE PROBE

USER’S MANUAL

MMD900

Please read this manual carefully and thoroughly before using this product.

TABLE OF CONTENTS

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 – 5

Key Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

What’s in the Case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

roduct Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 –7

Setup Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Install Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Operating Instructions . . . . . . . . . . . . . . . . . . . . . . 8 – 12

Measuring Moisture Levels . . . . . . . . . . . . . . . . 8 – 10

Advanced Setup Instructions . . . . . . . . . . . . . . 10 – 12

Checking Calibration . . . . . . . . . . . . . . . . . . . . . . . . 12

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Maintenance Tips . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Warranty Information . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Return for Repair olicy . . . . . . . . . . . . . . . . . . . . . . . 15

Thank you for purchasing General Tools & Instruments’ MMD900 Pin/Pinless

Deep Sensing Moisture Meter with Remote Probe. Please read this user’s

manual carefully and thoroughly before using the meter.

The MMD900 is designed for use in woodworking, water damage restoration,

building construction and home renovation. Examples include:

• Checking for moisture on or below the surface of carpets and

sub-flooring

• Measuring the surface moisture content of wood, drywall or concrete

before painting, wallpapering, sealing or treating

• Locating water leaks above ceilings, below floors or behind walls

• Selecting dry lumber

The meter senses the moisture level of a material using either of two

techniques:

1. Inferring the material’s electrical conductivity from the current flow

induced between a pair of steel pins placed on or into the material. The

wetter a material, the higher its conductivity. The MMD900 is equipped

with two pairs of test pins—one pair on the top of the instrument and the

other at the end of a cable and remote probe that can fit in tighter spaces.

2. Measuring the change in the material’s capacitance produced by the

slight spreading of a local electric field generated by the meter. When

the meter is powered on, two plates inside the back of the MMD900’s

housing are charged with opposite polarity and pulsed at a high

frequency. This causes current to flow, creating a three-dimensional

electromagnetic wave at radio frequency that extends about 2 in.

(50mm) perpendicular to the meter. When the back of the meter is

placed against a wet material, the increased capacitance of the material

distorts the wave’s electric field to an extent that can be measured. The

distortion—called the fringing field effect—is proportional to the

material’s moisture level.

WHICH SENSOR SHOULD YOU USE?

It depends on the application. The pinless (capacitive) sensor is the only choice

for estimating the surface or internal moisture level of materials like finished

wood, paint or wallpaper that cannot be marred by pinholes. If accurate

readings are important, the pin sensor is the only option because the pinless

sensor can only provide relative readings.

The distinction between absolute and relative readings is important to

understand. The moisture level measurements made by either pair of test

pins—on the instrument or on the remote probe—are displayed in units of

%WME (Wood Moisture Equivalent) simultaneously on a 0-99.9 count digital

LCD and a 40-LED analog bar graph. Pin measurements are accurate within

3% of the reading plus 5 digits.

By contrast, readings made by the pinless sensor are simultaneously displayed

with no units on the LCD and on a second scale (called REL) of the bar graph.

Although the pinless readings have no accuracy specification, they are

nonetheless useful for quickly comparing the moisture levels of materials, or

the wetness of different areas of the same material. Two possible uses for the

relative readings are:

1. Determining whether two pieces of wood to be joined have roughly the

same moisture content (which means they will dry out at the same rate

without warping).

2. Locating the source of a water leak above a ceiling, by comparing the

REL readings at various points on it. If the ceiling is level, the point with

the highest REL reading is below the source of the leak.

The biggest advantage of the pinless sensor is its ability to sense moisture up

to 2 in. below or behind the surface of a material. The stainless steel test pins

of the MMD900 can also sense moisture just below the surface of some

materials. However, for hard materials like wood or concrete, measurements

made by the meter’s test pins mostly represent surface moisture content

because: 1) Moisture close to the surface has a greater effect on a reading than

moisture deep below it; and 2) The pins of the MMD900 are too short to be

driven deep into a hard material. The pins at the top of the meter are 15mm

(0.6 in.) long and the pins on the remote probe are 10mm (0.4 in.) long.

For softer materials like soil, paper or powders, pin measurements are more

likely to reflect the average moisture level of the material between its surface

and the penetration depth of the pins (usually far less than 0.6 or 0.4 in.).

Other features of the MMD900 include the following:

• Any reading (%WME or REL) can be held by pushing a front-panel button.

Doing so—called locking or “freezing” the reading—makes it possible to make

a measurement in a dark place, hold it, and display it later in a better-lighted

area.

• The 40-LED analog bar graph groups LEDs of three different colors (green,

yellow and red) into low, medium and high moisture bands. Each readout

(%WME or REL) can be accompanied by a beeper that can be programmed to

sound in different ways in response to different moisture levels or operations.

The correlations make it easy to use sight and/or sound to pinpoint areas of

peak or relative wetness. The beeper can be disabled without affecting

measurements.

• An auto power off function that can be triggered by three, five or 10 minutes

of inactivity.

• The protective cover for the meter’s test pins can be used to manually check

the meter’s calibration. Alternatively, the meter can automatically check its

calibration each time it is powered on.

• A display icon indicates when the meter’s 9V battery is low on charge.

KEY FEATURES

• Two measurement modes: Pin (conductivity-based) and pinless

(based on the fringing field effect)

• Two sets of test pins: on top of the meter and at the end of 46 in. remote

cable

• Pin measurement accuracy of ±3%

• Pinless mode measurement depth of 2 in. below surface

• Displays %WME and relative readings simultaneously on two displays:

0 to 99.9 count jumbo LCD with 0.9 in. (23mm) digits, and 40-dot tri-color

LED bar graph

• Manual or automatic calibration checking

• Data hold (display lock or “freeze”) function

• User-programmable beeper function, backlight function and auto power off

time

• Low battery warning

• Includes two pairs of replacement test pins

• Spare pins storage compartment

WHAT’S IN THE CASE

The MMD900 comes in a custom molded plastic case along with a remote

pin-type probe and cable, a 9V battery, two pairs of replacement pins and this

user’s manual.

RODUCT OVERVIEW

The figure shows all of the controls, indicators and physical features on the

front, bottom, top, back and right side of the MMD900. Familiarize yourself with

their positions and functions before moving on to the Setup Instructions.

%WME

REL

PinSense

CAL

%WME

REL

B.L.

SET

A. Calibration check holes

B. Protective cover

C. 15mm replaceable test pins

D. Indicates display is locked (frozen)

E. Measurement mode indicator (REL shown)

F. Indicates beeper is enabled

G. Indicates battery is weak

H. Sensing area (on back of meter)

I. umbo LCD display

J. Five-function Mode button

K. Four-function button

L. Slots for holding protective cover (on bottom of meter)

M. Battery/spare pins compartment cover (on back of meter)

N. Tri-color 40-LED analog bar graph

O. Remote probe with 10mm test pins (shown with protective cap on)

P. ack for remote probe

SETU INSTRUCTIONS

INSTALL BATTERY

To open the battery compartment, turn the meter over and lift the tab on the

bottom of the battery compartment cover. Remove the cover and set it aside.

Then plug the included 9V battery into the wired socket inside the

compartment. The terminals of the battery and the socket mate in only one

way, with the smaller male terminal plugging into the larger female terminal.

Close the battery compartment by replacing its cover and snapping it shut.

O ERATING INSTRUCTIONS

To power on the meter, press the button and hold it for at least three

seconds. (To power off the meter, follow the same instruction.)

You can use the meter immediately to measure moisture levels using the

factory-set defaults for beeper and backlight operation and auto power off

activation time. By default:

• The beeper is enabled, and beeps faster the higher the readout above

17%WME in pin measurement mode (17 in REL mode).

• The auto power off function is disabled.

• The backlight is off.

To change the de ault settings or the beeper, backlight or auto power

unction, follow the Advanced Setup Instructions beginning on p. 10. At a

minimum, General recommends changing the default for the auto power off

function to “enabled”. If you leave the auto power off function disabled, you run

the risk of discharging the meter’s battery if you forget to power the meter off

when you are finished using it.

MEASURING MOISTURE LEVELS

Surface moisture levels should be measured by the test pins if the surface

being tested can tolerate pinholes. If it cannot, use the meter’s pinless sensor.

Internal moisture levels can be gauged by the pinless sensor for comparison

purposes.

The first step in measuring the surface moisture level of a material is to decide

whether to use the test pins on top of the meter or the test pins at the end of

the remote probe. Choose the remote probe if:

• Access to the target surface is limited (for example, if the surface is in

close quarters or a corner; the remote probe is slightly narrower than

the meter).

• You need to make one or more measurements above shoulder height,

near floor level, around a corner, or at any angle that makes it hard or

impossible to read the display. In situations like these, it’s easier to use

the meter by cradling it in your off hand, with the display facing you,

while using your dominant hand to position the remote probe.

To use the remote probe, remove the small rubber yellow plug from the jack

on the right side of the meter (callout P of the figure). Then insert the white plug

at the end of the cable into the jack.

To make a sur ace moisture level measurement, press the Mode button as

many times as necessary until the text “%WME” appears on the top line of the

LCD. Then press the test pins of the meter or the probe against the target

material. The material’s surface moisture level will be displayed as a

percentage on both the LCD and the LED bar graph.

The bar graph uses LEDs of three different colors (green, yellow and red) to

indicate different moisture level ranges (low, medium and high, respectively).

Readings below 17% are considered low, readings between 17% and 30%

medium, and readings above 30% high. If the beeper is enabled with the

factory-default setting, it will beep faster the higher the moisture level rises

above 17%.

To gauge the internal or sur ace moisture level o a material, enter REL

mode by pressing the Mode button as many times as necessary until the text

REL appears on the top line of the LCD. To establish a baseline for relative

readings, press the area of the back cover marked “Pinless Sensor” against a

material known to be completely dry. The meter should read “0” on both the

LCD and LED bar graphs. Then press the back of the meter against one or more

points on the target surface and compare the readings.

Some measurement tips:

1. For best results, press the pinless sensor against a flat area of the target

material.

2. When holding the sensor against a material, keep your hand and fingers

as far away from the sensing area as possible.

3. The dimensions of the target surface should be at least as large as those

of the sensing area: 1.6 x 1.6 in. (40 x 40mm).

4. Never use force to drive the test pins into a hard surface.

5. Measurements of wood are skewed by two variables: ambient humidity

and the density of the wood species. The best way to compensate for

the effect of these variables is to develop your own moisture level

curves, based on your experience working with different species of

wood on a day-to-day basis.

To scan a material or an area o peak wetness in either measurement

mode (%WME or REL), first make sure that the beeper is enabled (indicated by

the icon on the top line of the LCD). If the icon is present, scan the

material while paying attention to the beeper’s frequency. The faster the beeper

beeps, the wetter an area is. Near the high end of the meter’s measurement

range, the beeping sounds almost constant.

If the beeper has been disabled, to re-enable it you must power off the meter

and then change the beeper’s default setting using the Advanced Setup

instructions in the next section.

To hold a measurement, press the button briefly. The display will “freeze”

with the held value, along with a (lock) icon at upper right. To unlock the

display, press the button briefly again.

ADVANCED SETUP INSTRUCTIONS

In Setup mode, you can change the default settings for the meter’s beeper and

backlight and auto power off and calibration check functions.

To enter Setup mode, power off the meter by pressing the button and

holding it for at least three seconds. Then power the meter back on in a special

way by simultaneously pressing the and Mode buttons and holding them for

at least three seconds. Doing this will cause the beeper to sound, the backlight

to come on and the word “SEtUP” to scroll across the LCD.

After a few seconds, the LCD will read out “0 = 0”. In this format, the left digit

represents the Option No. and the right digit stands for the current setting for

that option. For example, “0 = 0” is shorthand for Option 0, Setting 0.

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