Extech Instruments MO257 Manual de usuario

User's Guide

Pinless Moisture Meter

Model MO257

www.burntec.com

MO257 V1.0 04/10

Introduction

Congratulations on your purchase of the Extech MO257 Pinless Moisture Meter. The

pinless moisture sensor monitors the moisture in wood and other building materials without

causing surface damage. High frequency sensing technology allows the meter to take non-

invasive moisture measurements. User programmable alarms alert the user if moisture

measurements exceed alarm set-points. This meter is shipped fully tested and calibrated

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

Meter Description

1. Measurement sensor

2. Power ON-OFF button

3. LCD display

4. Measure (MEAS) button

5. UP and BACKLIGHT button

6. SET button

7. DOWN button

Battery compartment located on rear of unit

LCD Display

1. Low Battery icon

2. Main LCD display

3. MAX reading

4. MIN reading

5. HOLD function

6. Measurement alert

7. MAX mode icon

8. MIN mode icon

Battery Replacement

1. Turn off the meter

2. Remove the Philips head screw located on the rear of the unit

3. Lift off the rear battery cover

4. Replace the three (3) ‘AAA’ 1.5V batteries

5. Secure the rear battery cover

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MO257 V1.0 04/10

Operation

Pinless Moisture Measurements

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

2. Before first use the meter must be calibrated to a known dry area as described below.

3. To calibrate, press the MEAS button immediately after powering the meter. The

display will audibly beep and visually flash the CAL display icon. Keep the

measurement sensor at least 3 to 4” (8 to 10 cm) from any object during calibration.

4. When the calibration is complete the beeping and flashing stop. The calibration

reading must not exceed 0.5. If so, re-calibrate ensuring that hands or other objects

are kept clear of the measurement sensor.

5. The meter should be calibrated whenever it is moved from one measurement area to

another.

6. To take a measurement, hold the meter and position the sensor so that it is very near

or directly touching the surface under test. The meter can sense moisture to a depth

of 0.79 to 1.57” (20 to 40mm).

7. IMPORTANT NOTE: The position of the hand can greatly affect a reading. Do not

move or reposition the hand that holds the meter while taking measurements or when

calibrating the unit.

8. The LCD indicates a relative moisture reading in numeric digits from 0.0 to 100.0 and

with programmable alarm alerts (DRY, RISK, and WET).

9. Press the MEAS button to hold (freeze) a reading on the LCD (the HOLD icon will

appear on the LCD). The meter will hold the reading for 30 seconds before

automatically shutting the meter down.

10. The MAX and MIN display areas indicate the highest and lowest readings

encountered since the measurement session was started.

11. If the battery symbol appears or if the meter does not switch ON, replace the

batteries.

Alarm Settings

Two high alarm points can be set for Moisture measurements: A RISK Alarm (0 to 50

setting range with a default setting of 30 units) and a WET Alarm (50 to 100 setting range

with a default setting of 60 units).

Moisture Alarm Setup Procedure:

1. Press the SET button. The RISK display icon will appear flashing on the LCD

indicating that a RISK alarm can now be programmed.

2. Use the up/down buttons to select the desired RISK Alarm value.

3. Press the SET button when the desired setting is displayed.

4. The WET icon will appear flashing on the LCD indicating that the WET Alarm is ready

to be programmed.

5. Use the up/down buttons to select the desired Wet Alarm setting.

6. Press SET to complete the programming.

7. Now, if the moisture measurement is higher than the RISK setting, the meter will beep

once every two seconds and if the moisture measurement is higher than the WET

setting the meter will beep four times per second.

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MO257 V1.0 04/10

Auto Power Off

To conserve battery energy, the meter will enter a sleep mode after approx. 30 minutes of

inactivity. Press the power button to wake the meter.

Backlit LCD

Press the up/backlight button to switch the backlighting ON or OFF.

Specifications

Function Range Accuracy

Moisture Range 0.0 to 100.0 Relative only

Measurement Depth 0.79 to 1.57” (20 to 40mm)

Display type Backlit LCD

Display digits Three (3) numeric displays; each displaying from 0.0 to 100.0

Display icons HOLD, DRY, RISK, WET, MIN, MAX and low battery icon

Operating Temperature 40 to 110°F (4 to 43°C)

Operating Humidity 90%, 32-86°F (0-30°C), 75%, 86-104°F (30-40°C),

45%, 104-122°F (40-50°C)

Power Supply Three (3) 1.5V ‘AAA’ batteries

Auto Power Off (APO) After 30 minutes of inactivity

Dimensions 9.2 x 2.5 x 1.1” (235 x 63 x 28mm)

Weight 7.7oz (218g)

Moisture Comparison Table (typical)

Material Display units Moisture status

Gypsum < 30 DRY

30 - 60 RISK

> 60 WET

Cement < 25 DRY

25 - 50 RISK

> 50 WET

Wood < 50 DRY

50 - 80 RISK

> 80 WET

www.burntec.com

MO257 V1.0 04/10



Support line (781) 890-7440

Technical Support: Extension 200; E-mail: support@extech.com

Repair & Returns: Extension 210; E-mail: [email protected]

Product specifications subject to change without notice

For the latest version of this User Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Road, Waltham, MA 02451

ISO 9001 Certified

Warranty

EXTECH INSTRUMENTS CORPORATION (A FLIR COMPANY) 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 to 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 www.extech.com for contact information. 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.

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 Care Department for

information on calibration services available for this product. Extech recommends that

annual calibrations be performed to verify meter performance and accuracy.

www.burntec.com

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