Differential Liquid Level Module - LDM

The differential liquid level module LDM (Liquid-level -Differential-Mini) utilizes differential capacitive measurement principle, measuring changes in dielectric constant through a capacitive sensing chip. The module outputs capacitance values via digital signals, which are converted into liquid level height, etc. It can measure continuous or segmented liquid levels and other media sensing, widely used in water level, oil level, material level detection, etc. The module includes a microprocessor, with embedded capacitance-to-physical quantity conversion calculation, alarm detection algorithms, temperature compensation, information storage, calibration support, etc. Customizable digital protocols such as I2C and 1-wire are available.

LDM has strong penetration capability, can penetrate 1-10mm non-metallic containers, effectively overcoming issues such as thick container walls, air gaps, or high viscosity of liquid media, accurately measuring capacitance changes. It is small in size, designed with minimal unit principle, in a stamp-hole board format, convenient for customers to integrate into product circuits. Different capacitance ranges can be measured by adjusting the peripheral circuit.

I. Characteristics of Differential Liquid Level Module - LDM:

Measurement method: Non-contact, can penetrate 1-10mm non-metallic containers, or contact type
Level accuracy: Depending on the measured object, electrode structure, and application, high accuracy up to 1%
Capacitance measurement range: 0-100pF (default range, other ranges customizable)
Capacitance measurement accuracy: 1%
Capacitance measurement resolution: 0.001pF
Capacitance measurement time: 50ms (customizable based on acquisition requirements)
Operating power consumption: 3mA@5V
Temperature characteristics
Temperature resolution: 12-bit ADC
Typical temperature measurement accuracy: ±3℃
Operating temperature range: -40℃~+85℃
Communication interface: I2C (1-wire customizable)
Operating voltage: 2.5V~5.5V
Dimensions: 11.5mm*11.5mm*2.5mm

II. Applications of Differential Liquid Level Module - LDM:

Water levelDetection

Oil levelDetection

Material level detection