Jingli KL-CS5 combustible material moisture content sensor Introduction

KL-CS5 User Manual

Jingli KL-CS5 combustible material moisture content sensor is a professional monitoring device based on the Time Domain Reflectometry (TDR) principle, primarily used in forest fire prevention and storage safety fields. This equipment accurately obtains the mass moisture content by measuring the dielectric properties of a dedicated pine stick. It can precisely assess the moisture state of standard forest combustibles with a 10-hour time lag, providing crucial data support for fire risk early warning.

I. Technical Principle and Measurement Mechanism

The sensor employs Time Domain Reflectometry measurement technology, determining the volumetric moisture content of the pine stick medium by detecting the propagation characteristics of high-frequency electromagnetic waves within it. The system consists of an epoxy-resin encapsulated electronic unit and a standard pine stick detection medium. When electromagnetic waves propagate through the pine stick, their propagation speed and signal attenuation have a definite functional relationship with the medium's moisture content. This physical relationship enables the sensor to infer the moisture state of combustibles with an accuracy of ±0.74% (RMS, 0-10% range).

II. Main Performance Characteristics

Measurement Range：0-70% mass moisture content

Measurement Accuracy：

· 0-10% range：±1.25% (Max Error)

· 10-20% range：±2% (Max Error)

· 20-30%range：±3.4% (Max Error)

· 30-50%range：±4.11% (Max Error)

Output Characteristics:±0.7 Vdc square wave signal, frequency output range 31-58 kHz

Communication Protocol: Supports SDI-12 standard, compatible with most data loggers

III. Technical Specifications

IV. System Integration and Installation Specifications

The device uses a standard SDI-12 digital interface and can connect directly to most data loggers. During installation, the sensor probe must be fully inserted into the calibrated dedicated pine stick, forming a stable monitoring unit with a fixed clamp and stake. The system supports multi-sensor networking; a single data logger can connect to up to 6 sensors to build a distributed monitoring network.

Wiring specifications are as follows:

Power Wire (Brown)：5-18 VDC Power Supply

Signal Wire (Orange)：SDI-12 Digital Communication

Ground Wire (Bare Copper):System Ground

V. Application Scenarios and Data Value

This sensor is specifically designed to assess the fire risk status of forest combustibles. By continuously monitoring changes in the moisture content of combustibles with a 10-hour time lag, it provides accurate input parameters for forest fire danger rating forecasts. Its long-term stability (3-year design life) and adaptability to harsh environments make it particularly suitable for unattended, continuous field monitoring scenarios. The measurement data can be directly used as input for fire risk models or serve as an early warning indicator for safety monitoring of combustible materials in storage.

The moisture content data output by the sensor is expressed in unit mass water content (1% = 1g), accurately reflecting the dryness of fine combustibles (approx. 1cm in diameter). This data is a key factor in assessing the probability of surface fire occurrence and the speed of fire spread.