Eigenschaften
Dimensions	173 x 60,5 x 38 mm
Weight	160 g

The material moisture meter CA 847 from Chauvin Arnoux is a compact measuring instrument from the Physics Line, specifically developed for determining the moisture content in building materials. It enables a quick and visual assessment of moisture content in the range of 6 to 100 %, with the measurement values displayed via an LED display. The display is divided into two ranges: Range 1 for moisture contents from 6 to 23 % and Range 2 for values from 24 to 100 %. A total of 20 LEDs are integrated, allowing for easy interpretation of the results. The measurement accuracy is ± 1 LED, enabling a visual estimation of moisture without relying on numerical values.

Applications

The CA 847 is primarily used in construction and renovation, where controlling the moisture content in building components is crucial for quality and durability. It is suitable for ensuring that substrates are sufficiently dry before applying plaster, drywall, or wood cladding. The device is applied directly to the surface of the material, with the built-in electrodes, 12 mm in length, penetrating the material to measure electrical conductivity, which correlates with moisture content. The robust design with a shock-protective housing makes the device suitable for use in construction site conditions.

Functions and Equipment in Detail

The device features built-in, replaceable electrodes with a length of 12 mm. These enable targeted measurement in the surface layer of the material. The display consists of 20 LEDs arranged in two ranges to visually represent the moisture content. A battery discharge indicator alerts the user in time to a required battery replacement, preventing measurement errors due to insufficient power supply. The shock-protective housing ensures high mechanical stability and extends the device’s lifespan under harsh operating conditions.

Technology Explained Simply

The CA 847 measures moisture content indirectly via the electrical conductivity of the material. Moist materials conduct electricity better than dry ones, so conductivity serves as an indicator for moisture content. The built-in electrodes contact the material’s surface, and the device measures the conductivity, which is converted into a visual value displayed across 20 LEDs. The measurement requires no additional tools or calibration. The accuracy of ± 1 LED means the display provides a rough, yet sufficient for many applications, orientation. The measurement values are not numerical but visually readable by the number of illuminated LEDs.

Compatibility and Accessories

The device is designed for use with building materials such as plaster, wood, and putty. It is not suitable for concrete. The electrodes are replaceable, allowing for maintenance and renewal. The device is used directly on the material without additional adapters or auxiliary tools.

Mounting and Installation

Installation or mounting of the device is not required. It is applied directly to the surface of the material being tested. The electrodes are pressed into the material, with a length of 12 mm enabling measurement in the near-surface layer. No additional mounting or installation procedures are necessary.

Operational Advantages

The CA 847 provides a quick and visual assessment of moisture content without requiring numerical values or complex operation. The shock-protective housing increases robustness, and the battery indicator prevents unexpected measurement interruptions. Replaceable electrodes enable long-term use. The compact design with dimensions of 173 x 60.5 x 38 mm (according to manufacturer specifications) and a weight of 160 g makes the device easy to handle and transport. The measurement requires no additional tools, making on-site application particularly simple. Batteries are not included in the delivery scope.