Manual - Extech Instruments
Contents
1. a Support line 781 890 7440 Technical support Extension 200 E mail support extech com Repair amp Returns Extension 210 E mail repair extech com Product specifications subject to change without notice For the latest version of this User s Guide Software updates and other up to the minute product information visit our website www extech com Extech Instruments Corporation 285 Bear Hill Rd Waltham MA 02451 Copyright 2006 Extech Instruments Corporation All rights reserved including the right of reproduction in whole or in part in any form 6 M0250 V2 1 6 062. 07 2mm into the material under test Note that the pins should be inserted into wood perpendicular to the wood s fiber structure For high moisture readings it may take several minutes for the meter reading to stabilize 1 0 07 2mm 5 Take several readings in several locations on the material for the best representation of the amount of moisture present 6 Readthe measurement values on the LCD digital display or the LED bar graph see bargraph diagram 7 Replace the protective cap when finished 1 Material 1 non wood moisture scale 13 100 alum co 2 Material 2 wood moisture scale 6 40 E 3 LED bargraph reading A 4 Color code for material 2 High Moisture 5 Color code for material 2 Medium Moisture 6 Color code for material 2 Low Moisture E 7 Color code for material 1 High Moisture when LEDs reach darker color Wood MMM Concrete 3 Data Hold feature 2 1 The Data Hold function freezes the reading in the display Press the HOLD key momentarily to activate the Data Hold function The reading will freezee and the HOLD display icon will appear Press the HOLD key again to exit the Data Hold function the HOLD display icon will switch off Max Min Memory feature The meter s Max Min feature allows the user to take multiple readings while storing the highest Max and lowest Min readings 1 Press the REC MAX MIN key to activate the MAX MIN recording mode The display icon REC will appe
3. User Guide EXTECH INSTRUMENTS Moisture Meter Model MO250 Introduction Congratulations on your purchase of the Extech MO250 Moisture Meter The MO250 detects moisture in wood and other building materials such as brick wall board sheet rock cardboard paper plaster concrete and mortar This meter is shipped fully tested and calibrated and with proper use will provide years of reliable service Features Designed to check the moisture level of wood concrete and other non wood material Measures from 6 to 40 moisture in wood Measures 13 to 100 relative moisture for concrete and other non wood material Measurements are shown on Red LED bargraph indicator and LCD digital display Optional external moisture sensor probe MO252 for remote moisture measurements Microprocessor provides high accuracy and advanced features such as MAX MIN Data Hold feature freezes displayed reading Heavy duty construction and compact housing enhance portability and durability Low battery indicator alerts user when battery needs replacing Description Meter Description 1 OMNOAARHWHD External probe input Measurement electrode pins LCD display POWER key HOLD key REC MAX MIN key MATERIAL key LED bargraph External probe plug 10 External probe Optional N Oa O Notes External probe is optional use part number MO252 to order probe Battery compartment tilt stand and t
4. ar Now begin taking measurements To view the MAX reading press the REC MAX MIN key again The display icon MAX and the maximum recorded value will appear on the display The meter will now display and hold the maximum reading To return back to the MAX MIN recording mode press the HOLD key It will update only when a new Max occurs To view the stored Min reading press the REC MAX MIN key again The display icon REC MIN and the minimum value will appear on the display The meter will display and hold the minimum reading To return back to the MAX MIN recording mode press the HOLD key It will update only when a new Min occurs To exit MAX MIN mode press and hold the REC MAX MIN key for 2 seconds then release The display icon REC will switch off 4 M0250 V2 1 6 06 External Probe optional An optional external probe is available part number MO252 that allows the user to reach into areas that would be difficult to access with the meter s built in electrode pins 1 The input socket for the external probe is located at the top of the meter 2 The plug and jack are keyed so that the plug can only fit in the jack one way 3 Turn the plug carefully until it lines up with the jack and then firmly push the plug in place Do not apply undue force or try to twist the plug side to side 4 The meter will continue to operate as described in this manual Battery Replacement If the instrument does no
5. 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 Service Department for information on calibration services available for this product Extech recommends that annual calibrations be performed to verify meter performance and accuracy
6. ripod mount are located on the rear of the instrument Electrode pin protective cover not shown 2 M0250 V2 1 6 06 Operation Electrode Pins 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 The electrode pins are replaceable removeable and must be inserted before the meter can be used To insert or replace the pins refer to the illustration and instructions below a b c d Remove the protective cap at the top of the meter To remove the pins loosen the locknut at the base of the electrode pins Install the new pins and tighten the locknuts 1 Replace the protective cap 5 H 1 Electrode pins i 2 Locking nuts 4 3 Threaded posts 4 Electrode jacks at top of meter Basic Operation Remove the protective cap to expose the electrode pins Press the POWER key to turn the meter ON OFF Press the MATERIAL key to select the material under test A T will appear in the right bottom display for concrete and other non wood material A 2 will appear for wood See details below Material 1 13 to 100 relative moisture for concrete and other non wood materials display shows a 1 on the bottom right Material 2 6 to 40 moisture range for wood the display shows a 2 on the bottom right 3 M0250 V2 1 6 06 Carefully push the electrode pins a minimum of 0
7. t switch ON or displays the low battery symbol E replace the battery as follows 1 Open the rear battery cover by removing the screw using a Phillips head screwdriver 2 Replace the 9V battery 3 Put the battery cover back in place Secure with the Phillips screw Maintenance e Always keep the instrument dry e To clean wipe the meter with a damp cloth Use a mild detergent if necessary but never use abrasives or solvents Prevent dirt from accumulating at the electrode pins Specifications Display LCD digital display and red LED bargraph scale Resolution 0 1 Accuracy 5 rdg 5 digits Sampling rate Memory Measurement principle Range Electrode pin length Electrode pin type Power supply Power consumption Low Battery Indication Meter housing Operating Temperature Operating Humidity Dimensions Weight One reading every 0 8 seconds approx Maximum and Minimum readings can be saved and viewed Electrical resistance Wood 6 to 40 Building materials 13 to 100 0 44 11mm Integrated replaceable 9V alkaline battery 16mA DC approx Battery symbol ES displayed on LCD Impact proof plastic 32 to 122 F 0 to 50 C 80 Relative Humidity maximum 8 4 x 2 7 x 1 2 216 5 x 68 5 x 29 7mm 8 8 oz 251g 5 M0250 V2 1 6 06 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
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