1. Introduction
The Gann Hydromette Compact B is an electronic structural moisture indicator designed for non-destructive measurement of moisture in various building materials. Utilizing a high-frequency measurement method with a versatile ball probe, this device allows for quick and easy detection of moisture distribution in walls, ceilings, and floors. It features a digital LCD display for clear readings and is an ideal preliminary test unit for all CM devices.
This manual provides essential information for the safe and effective operation, setup, and maintenance of your Hydromette Compact B.
Image 1: The Gann Hydromette Compact B, showing its compact design and ball probe for surface contact.
2. Safety Information
- Read all instructions carefully before using the device.
- Do not expose the device to extreme temperatures, direct sunlight, or high humidity.
- Keep the device away from strong magnetic fields.
- Use only the specified battery type (9V block battery or Ni-Cd battery).
- Do not attempt to open or repair the device yourself. Refer to qualified service personnel.
- Dispose of batteries according to local regulations.
3. Package Contents
Ensure all items are present in the package:
- Gann Hydromette Compact B device
- 9V block battery (pre-installed or included separately)
- User Manual (this document)
4. Setup
4.1 Battery Installation
- Locate the battery compartment cover on the back of the device.
- Slide or unclip the cover to open the compartment.
- Insert a new 9V block battery, ensuring correct polarity (+/-).
- Close the battery compartment cover securely.
The device can also be powered by a Ni-Cd battery (special accessory, not included).
4.2 Powering On/Off
- To power on the device, press the designated power button (if available) or simply place the ball probe against a surface to activate.
- The device features automatic calibration upon power-on.
- The device typically powers off automatically after a period of inactivity to conserve battery.
5. Operating Instructions
5.1 Measurement Principle
The Hydromette Compact B uses a patented dielectric constant/high-frequency measurement principle. This method allows for non-destructive moisture detection without the need for separate electrodes or cables.
5.2 Taking a Measurement
- Ensure the device is powered on and calibrated.
- Place the ball probe firmly against the surface of the material you wish to measure.
- The digital LCD display will show the moisture reading in digits (0 to 100).
- Move the device across the surface to trace moisture distribution. The maximum measurement depth is approximately 6 cm.
- Note the readings to identify areas of higher moisture content.
The Hydromette Compact B is particularly useful as a quick preliminary indicator for various building materials before using more precise CM devices.
6. Maintenance
6.1 Cleaning
- Wipe the device exterior with a soft, dry cloth.
- Do not use abrasive cleaners or solvents.
- Ensure the ball probe is clean and free of debris for accurate readings.
6.2 Battery Replacement
When the battery indicator shows low power or the device performance degrades, replace the 9V block battery following the steps in Section 4.1. Always use fresh, high-quality batteries.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not power on. | Low or dead battery; incorrect battery installation. | Replace the 9V battery; ensure correct polarity. |
| Inconsistent or no readings. | Ball probe not making good contact; dirty probe; device malfunction. | Ensure firm contact; clean the ball probe; if problem persists, contact support. |
| Display is dim or flickering. | Low battery. | Replace the 9V battery. |
If you encounter issues not listed here or if solutions do not resolve the problem, please contact Gann customer support.
8. Specifications
| Model | Hydro Compact B |
| Part Number | GA_2030 |
| Measurement Method | High-frequency, dielectric constant, ball probe |
| Measurement Range | 0 to 100 digits |
| Max. Measurement Depth | 6 cm |
| Dimensions (W x H x D) | 35 mm x 200 mm x 35 mm |
| Weight | Approx. 190 g |
| Power Supply | 9V block battery (Alkaline) or Ni-Cd battery (special accessory) |
| Operating Humidity | 0-100% (non-condensing) |
| Max. Service Temperature | 50 °C |
| Voltage | 9 Volts |
| Color | Silver, Grey, Black |
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your authorized Gann dealer or visit the official Gann website. Keep your purchase receipt as proof of purchase for warranty claims.
Manufacturer: Gann


