Waterproof Ultrasonic Distance Sensor (27~800cm, ULA)

Water-proof Ultrasonic Sensor (ULA) is a high‑performance ultrasonic ranging module equipped with an enclosed waterproof probe designed for stable operation in harsh environments. Using ultrasonic echo‑ranging principles, this industrial distance detection unit calculates object distance by measuring the time interval between transmitted pulses and returned echoes, enabling accurate non‑contact measurement. The enclosed transducer and bell‑mouth acoustic structure improve signal directivity and measurement stability. Such ultrasonic measurement hardware supports detection of transparent or non‑ferrous materials, metal and non‑metal objects, as well as liquids, solids, and powder materials across industrial and automation scenarios.

Note: the internal probe surface is regarded as the detecting starting point by default. If the plane of the bell-mouth shell is used as the starting point, the measured distance equals the detected distance minus 40mm.

Enclosed Waterproof Probe for Harsh Environments

This waterproof ultrasonic ranging module integrates a sealed probe and robust housing that provide a high level of environmental protection. The enclosed transducer structure prevents water intrusion and contamination from dust or debris, supporting reliable operation in outdoor monitoring systems and industrial automation installations. The protective acoustic design also maintains signal stability during continuous operation, allowing consistent distance measurement performance even in humid, dusty, or splash‑prone environments where typical open ultrasonic sensors experience reduced reliability.

Bell‑Mouth Acoustic Structure for Directional Stability

A distinctive bell‑mouth shaped acoustic shell enhances ultrasonic beam directivity and improves signal stability. This physical structure concentrates transmitted sound waves into a controlled detection zone, reducing scattering and improving echo reception from target surfaces. The directional beam profile supports more predictable measurement behavior in complex environments containing multiple objects, reflective surfaces, or irregular materials. Such acoustic optimization enables reliable ranging results across industrial detection tasks and automated monitoring systems.

Dual Output Modes for Flexible Integration

This ultrasonic distance measurement device supports two output interfaces: standard RS232 digital communication and voltage analog output. RS232 mode provides direct serial data for microcontrollers, industrial controllers, and embedded systems, while analog output enables straightforward integration with analog acquisition circuits. Default configuration uses RS232 communication, and output mode switching can be performed using the onboard button. This flexible interface design supports diverse control platforms, automation equipment, and sensor data acquisition systems.

High Measurement Accuracy with Temperature Compensation

High resolution distance measurement combined with built‑in temperature sensing improves ranging accuracy across varying environmental conditions. Temperature output allows compensation algorithms to adjust ultrasonic propagation calculations, minimizing measurement drift caused by air temperature changes. Accurate sensing performance together with millimeter‑level resolution enables precise monitoring of object distance, liquid levels, material position, or obstacle proximity in industrial sensing and automation control systems.

Figure: ULA Beam Directionalities Diagram

Figure: Dimension Diagram

Reliable non‑contact measurement capability makes this ultrasonic sensing module suitable for liquid level monitoring, industrial material detection, robotics obstacle ranging, smart equipment distance measurement, and environmental sensing systems. Stable ultrasonic beam directionality, waterproof construction, and flexible output interfaces support deployment in automation control, outdoor sensing, and intelligent monitoring applications.