MESTEK WM710A Digital Moisture Meter User Manual

Overview

This is a non-destructive moisture meter featuring a spheroid sensor that does not damage the tested material. It offers a measurement depth of approximately 20 mm-40 mm and is suitable for concrete, wood, floors, walls, and other construction materials. Understanding moisture content is crucial as water trapped in building materials can lead to corrosion, mold, rot, and paint peeling over time.

Important Note on Moisture: Water in concrete can take 1-2 months to fully cure. Moisture can penetrate brick walls even with good insulation. Water trapped after floods is released very slowly. Absorbed moisture can increase material water content, leading to damage.

Warnings and Precautions

The indicated moisture level is an average value. If surface moisture is visible, wipe it dry and allow the surface to air dry for a few minutes before measurement.

The measurement depth is 20-40 mm. If the material thickness is less than 20 mm, readings may be inaccurate due to adjacent materials. Ensure surfaces are clean of paint residues, dust, etc., before measurement.

Safety Information:

• This device is not a toy. Keep away from children to prevent injury or damage.
• Protect the device from high temperatures, direct sunlight, strong vibrations, and corrosive liquids/gases.
• If the device is damaged, discontinue use immediately to avoid injury.
• Use the device at normal temperatures; significant temperature variations may affect accuracy.
• Do not drop or handle the device improperly.
• Keep the device free from dust. Clean with a damp sponge and dry if necessary.
• Ensure correct battery polarity. Remove batteries if the device is stored for extended periods to prevent leakage and damage.
• Do not disassemble or tamper with the device. Contact a service center for assistance.
• Metal objects (screws, nails, wires, pipes) within the sensor's measurement area can cause sudden, inaccurate readings due to reflection.
• Place the sensor on smooth surfaces for accurate results; rough surfaces can lead to inaccuracies.
• Material density affects readings; higher density generally leads to higher moisture values.
• Hold the sensor at a right angle to the surface being measured.
• When measuring near corners (e.g., tile joints), readings may be higher. Keep the sensor head 80-100 mm away from corners.
• Keep hands a sufficient distance from the measuring head during measurement to avoid influencing results with hand moisture.

LCD Display

The LCD display features:

• 1. Analog Display
• 2. Numerical Display
• 3. Low Battery Indicator
• 4. DRY (Dry)
• 5. RISK (Risk)
• 6. WET (Wet)
• 7. HOLD (Data Hold)
• 8. Maximum Value
• 9. Minimum Value
• 10. Auto Power Off Symbol

Functions

The device offers:

• 1. Non-destructive Moisture Measurement
• 2. Color Display
• 3. Power On/Off Button
• 4. SET Button
• 5. MEAS Button (Calibration/Data Hold)
• 6. ▼/▲ Buttons: Numeric Value Adjustment (Minus and Plus)
• 7. MAX/MIN Button: Hold Maximum and Minimum Value

Instructions

Turning On/Off:

Briefly press the Power On/Off button to turn the device on or off.

Calibration:

After the first power-on, calibrate the device by placing it in the air (sensor not touching any object). Ensure the sensor is at least 80-100 mm away from any object or hands. Press the MEAS button to start calibration. The LCD will show 'CAL'. Calibration is complete when the device beeps twice within 3 seconds. The LCD will then display the current moisture value with a calibration value of 0. If not, restart and recalibrate.

Note on Calibration: Maintain the same hand position during calibration and subsequent measurements. Any change in hand position relative to the sensor head can cause measurement errors. Recalibrate after every power-on and when changing measurement points or objects.

MAX/MIN Function:

Briefly press the MAX/MIN button during measurement to toggle the lock on the maximum or minimum value.

Measurement:

Hold the spheroid sensor head at a right angle to the surface. The measured value will appear on the display. Move the device across the surface to measure a larger area; the LCD will show the current, maximum, and minimum values.

To lock the displayed value, press the MEAS button; 'HOLD' will appear. Pressing MEAS again in HOLD mode exits HOLD and allows further measurement.

The device has an automatic power-off function after approximately 30 minutes of inactivity. To cancel auto power-off, press and hold the MEAS button while turning the device on. The 'APO' symbol will appear. This setting is not saved and must be reset after manual power-off.

Setting Limit Values:

The device uses DRY, RISK, and WET indicators. It will beep if the status is RISK or WET. Default settings are: <30 = DRY, 30-60 = RISK, >60 = WET. Different materials have different optimal moisture values; refer to the Humidity Limit Range section for details.

To set limits:

1. When 'HOLD' is displayed, press the SET button to enter setting mode.
2. When 'RISK' flashes, use the ▼ or ▲ buttons to set the lower limit for RISK mode (0-50, default 30). Press SET to confirm.
3. When 'WET' flashes, use the ▼ or ▲ buttons to set the lower limit for WET mode (51-100, default 60). Press SET to confirm.

The limits for RISK and WET are now set and saved. Press the MEAS button to return to measurement mode.

Technical Specifications

Humidity Limit Range

Battery Replacement

1. Turn off the device.
2. Using a screwdriver ?, unscrew the screws securing the battery compartment cover.
3. Remove the cover.
4. Remove the old batteries.
5. Insert 3 new 1.5V AAA batteries, ensuring correct polarity.
6. Reinstall the battery compartment cover and secure it with the screws.