User Guide
Wireless Moisture Analyzer
Model MO270
2
Table of Contents
Introduction .......................................................................................................................................... 2
Features .............................................................................................................................................. 3
Description ........................................................................................................................................... 3
Initial Setup and Battery Charging ........................................................................................................ 6
Operation ............................................................................................................................................. 7
Measurement Screen Menus ............................................................................................................. 10
Alarm Operation ................................................................................................................................. 12
Trend Analysis Display Feature ......................................................................................................... 12
Memory Logging Mode ...................................................................................................................... 13
Calibration Verification ....................................................................................................................... 14
Battery Replacement ......................................................................................................................... 15
Maintenance ...................................................................................................................................... 15
Specifications ..................................................................................................................................... 15
Appendix A – Wood Groups ............................................................................................................... 16
Appendix B – Menu Structure User Interface ..................................................................................... 20
Introduction
Thank you for selecting the Extech MO270 Moisture Analyzer with full graphical display. The
MO270 detects moisture in wood, particle board, carpeting, and ceiling/bathroom tiles noninvasively (pinless); the MO270 also measures moisture in sheet rock and other building materials
using pins that are driven into the material under test. The Sensor unit (transmitter) detaches from
the Analyzer unit (receiver) for remote measurement operation. This analyzer is shipped fully
tested and calibrated and, with proper use, will provide years of reliable service. Extech
Instruments is an ISO-9001 certified company.
IMPORTANT NOTES – PLEASE READ BEFORE CONTINUING
The MO270 is a field upgradeable device in terms of its firmware. Please visit the
Extech Instruments website (www.extech.com) for the latest versions of the
firmware and the Instruction Manual.
To conserve battery energy, the MO270 is shipped with the two ‘hidden’ ON/OFF
switches set to OFF. Please refer to the ‘Analyzer Components’ diagram (items 5 and
6) in the Description section of this manual to locate these switches. Please switch
these ON in order to permit proper meter operation.
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Features
1. Detachable sensors transmit data up to 65ft (20m) to the analyzer’s display
2. Readings from up to eight (8) remote sensors can be viewed
3. Wireless sensor affixes to 4 ft. (1.2m) telescoping handle; Longer handles optional
4. Wood Moisture equivalent (%WME) pin readings
5. Programmable visual and audible High and Low Alarms
6. 2-point calibration check built into protective cap
7. Bluetooth capability
8. Includes two (2) 3.7V rechargeable Li-Polymer batteries (one for Analyzer and one for Sensor),
wireless moisture Sensor unit, external pin probe, replacement pins, telescoping handle, AC
adaptor, protective cap, 2G SD card, all necessary interconnecting cables, and hard case
Description
Analyzer Front View
1. Electrode pins and Protective cap with
calibration check points
2. Sensor release buttons (one on either side of
analyzer)
3. Graphical Display
4. Function buttons (F1, F2, F3)
5. Power button
6. Bluetooth status indicator lamp
7. Navigation (up, down, left, right) and ENTER
buttons
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Analyzer Side Views
1. Sensor release buttons
2. Ports reserved for future options
3. RJ-45 remote probe port
4. Sensor (transmitter) mini-USB charge-port
5. Mini-SD card slot
6. Analyzer (receiver) mini-USB charge-port
Analyzer Components
1. Cap with built-in calibration check
2. Measurement contact pins
3. Non-Contact capacitive sensor (transmitter)
4. Power button for sensor (used only when sensor is disconnected from receiver)
5. Lithium polymer battery shut-off switch for Sensor (transmitter); (used when
shipping/transporting the unit or when the unit is to be stored unused for long periods.
6. Lithium polymer battery shut-off switch for Analyzer (receiver)
7. Analyzer (Receiver) unit
IMPORTANT NOTE: The MO270 is shipped with the two ON/OFF slide switches set to OFF. Please
refer to the diagram above to locate these switches. Please switch these ON in order to permit
proper meter operation.
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Display Icons
ICON
Name
Function
(black)
Low Alarm set
Audible Low Alarm is set and active
(black)
High Alarm set
Audible High Alarm is set and active
(black)
Low Alarm set
Visual-only Low Alarm is set and active
(black)
High Alarm set
Visual-only High Alarm is set and active
(red)
Low Alarm triggered
Low Alarm has been triggered
(red)
High Alarm triggered
High Alarm has been triggered
(gray)
Transmitter ON
Transmitter is ON but not communicating with
peripheral device via BluetoothTM
(blue)
Active pairing
Active BluetoothTM communication between
receiver and peripheral device
(gray)
(RF) Wireless
Wireless transmitter is ON; sensor
communication is INACTIVE
(orange)
(RF) wireless
Wireless transmitter is ON; sensor
communication is ACTIVE
(blue)
REL mode
Reading moisture using non-invasive sensor
%
(blue)
%WME mode
Reading moisture using ‘pin’ sensors
(black)
External probe
Reading measurement from external probe
(blue)
Internal probe
Reading measurement from internal probe
(red)
Recording
Unit is actively recording (on-screen)
(green)
Sensor (transmitter)
battery
Sensor battery (shown here fully charged)
(orange)
Analyzer (receiver)
battery
Analyzer battery (shown here minimally
charged)
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Initial Setup and Battery Charging
Getting Started
1. Charge the Sensor and the Analyzer batteries if necessary (refer to the ‘Charging the
Batteries’ section below). The battery icons on the upper right corner of the display provide
battery status for the Analyzer and the Sensor units.
2. To switch the analyzer ON, press and hold the power button for 3 seconds; the
navigation buttons will illuminate, the speaker will chirp, and the display will switch ON.
3. To power OFF, press and hold the power button for 3 seconds.
4. The F1, F2 and F3 buttons are ‘soft keys’; their functions change with the specific mode or
screen that is active.
5. The ▲, ►, ▼ and ◄ buttons are used to navigate the menu selections.
6. The center ENTER button is used to select the highlighted menu function and for
accessing the setup mode (by pressing and holding).
Charging the Batteries
1. Charging the batteries using an AC outlet
Connect the USB cable between the mini-USB port on the Sensor (or the Analyzer) and an
AC outlet. Charging will begin immediately. Note that connecting to the Analyzer’s USB port
charges both the Analyzer and the Sensor units simultaneously (while they are physically
connected to each other).
2. Charging the batteries using a PC USB port
a. With the Analyzer ON/OFF switch turned ON, connect the USB cable between the
mini-USB port on the Sensor (or the Analyzer) and a USB port on the PC. Note that
connecting to the Analyzer’s USB port charges both the Analyzer and the Sensor
simultaneously (while they are physically connected to each other).
b. Switch the Analyzer ON using the power button (hold it for 3 seconds) and the menu
show directly below will appear.
PC CAM (reserved for future use)
Disk Drive (meter behaves essentially as an external hard drive where stored
readings can be viewed and organized)
Charger (selected when connection to PC is to be used for charging purposes)
Note: The PC may return a driver error when the CHARGER option is selected as a
result of the PC sensing a new device connection; this can be ignored; the charging
process will not be affected.
3. Checking Battery Status
When ‘CHARGER’ is selected from the menu as discussed above (with the meter connected
to the PC), the battery icons will animate in a rising and falling motion indicating that
charging is taking place. To check the battery status, the meter must be disconnected from
the PC. Once disconnected, the display will show the two battery icons in the upper right.
The (Analyzer) and (Sensor) icons will be completely filled when the batteries are fully
charged and progressively emptier as the batteries weaken.
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Operation
Basic Operation for Pin Measurements
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.
1. Remove the protective cap to expose the electrode pins.
2. Press and hold the key for 3 seconds to switch the analyzer ON.
3. If the icon is displayed, proceed as follows to switch to the
a) Press the MENU (F1) button and navigate to the WME/REL box.
b) Press to toggle WME and REL (select WME) and then press EXIT.
4. Carefully push the electrode pins a minimum of 0.07” (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, several minutes may be required for readings to stabilize.
5. Take readings in several locations on the material under test for the best representation of
the amount of moisture present.
6. Read the measurement value on the display.
7. Replace the protective cap when finished.
Using the Extender Probe Handle
The supplied telescoping handle can be used to extend the sensor into areas that are difficult or
unsafe to reach. Connect the sensor (transmitter) unit to the extender using the extender’s
mounting screw and the mounting screw hole on the sensor. Note that extender handles of
various lengths are optionally available. Once connected, instructions for use match those
provided above in the ‘Basic Operation for Pin Measurements’ section and below in the ‘Basic
Operation for Pinless Measurements’ section.
Basic Operation for Pinless Measurements
%
%
icon.
1. Press and hold the key for three seconds to switch the analyzer ON.
2. If the
3. Press and hold the key for three seconds to switch the analyzer OFF.
4. Keep hands and other materials away from the rear sensor and then press and hold the
5. The pinless moisture detector is located at the rear of the instrument, just behind the display.
6. Place the analyzer so that the sensor lies flat against the surface of the material under test.
7. Take readings in several locations on the material for the best representation of the amount
8. Read the measurement values on the display.
%
icon is displayed, proceed as follows to switch to the icon.
a) Press the MENU (F1) button and navigate to the WME/REL box.
b) Press to toggle REL and WME (select REL) and then press EXIT.
button to switch the analyzer ON. The analyzer will auto-zero during power-on.
of moisture present.
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