Dayu Electronics M33 Underwater Obstacle Avoidance Sensor for Underwater Ranging and Liquid Level Monitoring

In the fields of underwater distance measurement and liquid level monitoring, engineers often face this dilemma:

Want to measure the remaining fuel in a tank, but there are several millimeters of steel plate in the way — ordinary ultrasonic sensors simply give up;

Want to measure the oil-water interface — traditional float balls easily get stuck, and optical probes are afraid of oil contamination;

Want to install on moving vehicles or ships — wide voltage, vibration resistance, and IP68 waterproofing are all indispensable...

These scenarios may seem simple, but they actually impose stringent demands on the sensor's penetration capability, accuracy, stability, and environmental adaptability. There are not many options when it comes to finding a device that simultaneously delivers high precision, high protection, and flexible installation.

Is there a device that can combine high precision, high protection, and flexible installation, while easily handling the above problems?

Dayu Electronics M33 underwater obstacle avoidance sensor happens to address all of the above challenges one by one.

I. An "Underwater Eye" Born for Complex Working Conditions

The Dayu Electronics M33 underwater obstacle avoidance sensor is not an ordinary level gauge in the traditional sense, but a series of ultrasonic sensors specifically designed for underwater distance measurement, obstacle avoidance, and liquid level monitoring. Featuring an aluminum alloy housing and IP68 fully waterproof design, it can withstand up to 50 meters of water pressure, with an operating temperature range of -20°C to +60°C. Whether in freezing outdoor environments or high-temperature engine rooms, it delivers stable and accurate data output.

The core difference lies in frequency — two models, each with its own strengths:

1MHz version: Strong penetration, specifically designed for "through-wall measurement"

1MHz mode: Strong penetration — can measure through steel plates. Direct measurement range in clean water is ≤6000mm; even through a 3mm steel plate, a range of ≤2000mm is guaranteed, making it suitable for external mounting on closed containers.

2MHz version: High precision, specifically designed for "close-range precision measurement"

2MHz mode: Higher precision — the blind zone for direct measurement in clean water is only ≤50mm, with a range of ≤3000mm, making it suitable for immersion-type precision measurement. Even through a 3mm steel plate, the range can still reach ≤1000mm.

Common features of both:

IP68 fully waterproof + pressure resistance up to 50 meters of water — from outdoor rainstorms to long-term underwater submersion, normal operation without water ingress

No mechanical moving parts — no trouble of float balls getting stuck, no anxiety of optical lenses being obscured by oil contamination

Power supply range DC 10.8~26.0V with reverse polarity protection — can be directly connected to cigarette lighter sockets, batteries, or industrial power supplies

Install it, power it on, and leave the rest to it — 24-hour uninterrupted monitoring, stable output for underwater depth measurement, distance measurement, and obstacle avoidance.

II. Three Major Advantages, Specifically Targeting Various "Hard-to-Measure" Conditions

1. High Precision + High Repeatability, Rock-Solid Data Stability

Measurement accuracy in clean water at room temperature: ±0.5%~1.0%;

Repeatability accuracy: ±0.5%, combined with automatic temperature compensation, maintaining stable output across different water temperatures, delivering true and reliable data.

2. IP68 Fully Waterproof + 50-Meter Pressure Resistance, Rugged Protection

Aluminum alloy housing with fully sealed structure. Whether it's a sprinkler truck operating in heavy rain, long-term submersion in outdoor rivers, or high-humidity environments in underground wells — normal operation without water ingress.

No mechanical moving parts — install it, power it on, and leave the rest to it.

3. Wide Voltage + Ultra-Low Power Consumption

Power supply range DC 11.0~26.0V with reverse polarity protection,

Regular batteries or AC-to-DC switching power supplies can both provide direct power.

Clear requirements for power quality: no electromagnetic interference, ripple <1.0%, voltage drop <2.5V.

No-load current ≤15mA, rated operating current ≤100mA;

Start-up delay <5.0s;

Even when powered by batteries (e.g., in remote field monitoring stations), it can operate stably for extended periods with extremely low power consumption.

III. Core Parameters at a Glance

IV. Scenario Analysis: Selecting the Right Model Solves Half the Problem

Whether a device performs well depends first on selecting the right model. The 1MHz handles penetration, the 2MHz handles precision — between the two M33 models, one will surely match your working conditions.

V. About Dayu Electronics

Since its founding in 2008, the company has been consistently focused on the R&D and industrialization of ultrasonic technology. From transducers to software and hardware, everything is independently developed, and products have been widely applied in meteorological monitoring, marine environments, industrial measurement and control, and other fields.

If you are grappling with a "hard-to-measure" liquid level condition, feel free to throw the challenge to Dayu — let's work together to see if this dual-frequency sensor can help you get it done.