Dayu Electronics: Real-Time Liquid Level Differential Alert, Completely Solving Grate Clogging and Water Backflow Problems

An environmental protection equipment integrator in East China needs to monitor two water levels simultaneously (such as river and pond, inlet and outlet) in municipal parks, pumping stations, sewage treatment plants, and other locations, and determine whether the water level difference is safe.

01 What problems are your customers struggling with?

Common troubles with traditional methods:

Scenario 1: Grate in sewage treatment plant

Garbage and debris clog the grate, and the liquid level difference before and after gradually increases. If not cleaned in time, excessive pressure difference across the grate can reduce water flow velocity and even damage equipment. The traditional method relies on manual periodic checks, but often the clogging is already severe when discovered.

Scenario 2: Drainage stations or between river channels and ponds

If the upstream water level is too high, it may backflow into downstream areas or urban areas. Real-time monitoring of the water level difference is needed to open or close gates in time. Manual patrol cannot provide 24-hour monitoring, and a single-point level gauge cannot show the difference.

Common pain points:

The water level difference between two points is the key judgment basis, but manually comparing two data sets is both cumbersome and delayed.

The site is humid and rainy, and ordinary sensors are prone to water ingress and damage.

When equipment malfunctions, debugging is difficult and requires factory visits.

These issues are faced daily and accumulate to drain energy.

    02 System Composition and Core Functions

System Composition

Component                           Features

Ultrasonic probe ×2           IP68 protection, physically sealed with potting compound, will not be damaged even when submerged.

Liquid level differential transmitter (main unit)    Installed in the control room, displays front-end liquid level, ambient temperature, and automatically calculates the liquid level difference.

Transmission method                   Integrated wiring, probes directly connected to the main unit, no wireless signal conversion required.

Core Functions

Real-time monitoring of river channel liquid level and pond liquid level.

Automatically calculates and displays the liquid level difference, eliminating manual comparison.

The transmitter simultaneously displays liquid level and ambient temperature.

Supports high/low alarm for the difference, and can be linked to gates or pumps.

Data can be viewed on-site or uploaded to PLC/SCADA systems.

03 Four Major Advantages for Field Use

1. Automatic Alarm on Differential Exceeding Limits – Early Warning of Clogging or Backflow

　　Liquid level differential meterThe most typical application is before and after the grate in sewage treatment plants: when garbage clogs the grate and the liquid level difference before and after exceeds the set value, the system automatically alarms, reminding workers to clean it in time, avoiding equipment damage. Similarly, in drainage stations or between river channels and ponds, differential over-limit can warn of backflow risk.

Compared to using two single-point level gauges and manually calculating the difference, this equipment automatically calculates the difference, saving manual comparison and avoiding calculation errors, allowing duty personnel to see the level difference at a glance. Of course, in some cases it can also be used as two ordinary level gauges, but the core value lies in "differential over-limit alarm".

2. Key Parameters Match Customer Requirements

The equipment has a built-in echo curve menu. On-site commissioning personnel can directly view the ultrasonic echo signal to determine whether it is interference, blind zone, or installation angle issues.

Most on-site anomalies can be resolved through menu adjustments without returning the equipment to the factory or waiting for technical support visits, significantly reducing maintenance costs and downtime.

3. IP68 Probe – Will Not Be Damaged When Submerged

The sensor is physically sealed with potting compound, achieving an IP68 protection rating. Rainy riverside conditions, temporary submersion due to rising water, or occasional immersion at the installation site will not damage the equipment. This is crucial for humid environments; the IP68-rated probe can work continuously for 3 to 5 years in the field.

4. On-Site Direct View + Remote PLC Connection – Both Methods Supported

Duty personnel can directly view the current liquid level difference on the main unit screen to determine whether to open or close gates on-site.

It also supports RS485 (Modbus) and 4-20mA signal upload to PLC and SCADA systems, enabling remote automatic control or linked alarms.

04 Installation and Site Selection Recommendations