Extech MO100 Moisture Detector User's Guide
Model: MO100
[CE mark]
Introduction
Congratulations on your purchase of the Extech MO100 Moisture Detector. Readings are made by inserting the pins into the material being measured. Careful use of this meter will provide years of reliable service.
Cautions
- This device is not a toy and must not reach children's hands. It contains hazardous objects as well as small parts that the children could swallow. In case a child swallows any of them, please contact a physician immediately.
- Do not leave batteries and packing material lying around unattended; they can be dangerous for children if they use them as toys.
- In case the device is going to be unused for an extended period of time, remove the batteries to prevent them from leaking.
- Expired or damaged batteries can cause cauterization on contact with the skin. Always, therefore, use suitable hand gloves in such cases.
- See that the batteries are not short-circuited. Do not throw batteries into the fire.
Specifications
| Display | Two LCD displays | Operating %RH | 90% Relative Humidity (max.) |
|---|---|---|---|
| Display Range | 0 to 100 | Power | Two (2) AAA batteries |
| °C/°F Range | 0°C to 50°C (32°F to 122°F) | Dimensions | 192 x 30 x 45 mm (7.6 x 0.8 x 1.8") |
| °C/°F Resolution | 0.2° | Wt. | 108g (3.8oz) |
Meter Description
The Extech MO100 Moisture Detector has the following components:
- Pins
- Temperature sensor
- Rotating Head Lock Release
- Display
- CAL Adjustment
- Off/Test/Cal switch
- Hold button
- °C/°F switch
- Temperature display
- Batteries
[Diagram Description: An illustration of the Extech MO100 Moisture Detector. It shows two views of the device. The first view is a side profile illustrating the pins, temperature sensor, rotating head lock release, display, CAL adjustment knob, Off/Test/Cal switch, Hold button, and °C/°F switch. The second view shows the back of the device, highlighting the battery compartment with two AAA batteries and the temperature display.]
Operation
Calibration
- Slide the Off/Test/Cal switch to the CAL position.
- Adjust the rotary CAL adjustment until the display reads 100. (The CAL adjustment knob is recessed to prevent it from being accidentally changed. Use an object with a tapered end to make adjustments.)
- Slide the Off/Test/Cal switch to the TEST position.
- The meter is now ready to take readings.
Taking Readings
The following procedure is used to make relative or comparative readings of the moisture content in wood, wallboard, or other materials. The readings you will obtain are relative indications of the moisture level, NOT % moisture content. To freeze a reading in the display, press the HOLD button.
- Slide the switch to TEST.
- To establish a benchmark for the material you are reading, insert the sensor's test pins into a known dry (or acceptable) area of the material being tested. Insertion should be as deep as possible. Note this 'dry' reading.
- Then insert the sensor's test pins into a known wet area of the material being tested. Insertion should be as deep as possible. Note this 'wet' reading.
- Use these dry-to-wet readings as reference points to which subsequent readings can be compared.
Typical Dry and Wet Readings
| Wallboard | Wood | ||
|---|---|---|---|
| Indication | Moisture Rating | Indication | Moisture Rating |
| 0-5 | Dry | 0 to 8 | Dry |
| 6-14 | Moist | 9-22 | Moist |
| >14 | Wet | >22 | Wet |
Converting Relative Readings to %Moisture Content
The readings obtained with this meter are relative indications of the moisture level, NOT % moisture content. Please refer to the table for an approximate conversion of relative readings to % moisture content.
Wood Scale Conversion (Approx)
| REL | 2 | 4 | 8 | 16 | 22 | 30 | 38 | 44 | 62 | 68 | 72 | 76 | 78 | 83 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| %MC | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 |
Temperature Units
This meter displays ambient temperature. Readings can be displayed in °C or °F. Use the slide switch on the back of the meter to select the appropriate unit of measure.
Battery Replacement
Slide the battery compartment cover off, replace the two AAA batteries, and reinstall the cover.
[Diagram Description: An illustration showing the battery compartment cover being removed from the back of the moisture detector, revealing the space for two AAA batteries.]
[Waste bin with cross symbol] Never dispose of used batteries or rechargeable batteries in household waste. As consumers, users are legally required to take used batteries to appropriate collection sites, the retail store where the batteries were purchased, or wherever batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end-of-life devices to a designated collection point for the disposal of electrical and electronic equipment.
Pin Replacement
For your convenience, this meter uses threaded pins. To replace a pin, simply unscrew the pin from the meter and replace with a new one, being careful not to overtighten.
Safety Note: The MO100 has a rotating head with a push button lock release for your safety. Please remember to rotate the head back so that the pins are safely hidden inside the storage area.
