MALEMA USC-801-2 Ultrasonic Flowmeter Bnc 24VDC RS-485 2-ALARMS Flow Meter

( Brand: Malema ), ( Manufacturer Part Number: USC-801-2 ), ( Country Of Origin: Japan ), ( Flow Meter Type: Ultrasonic )

Review MALEMA Ultrasonic Flowmeter 24vdc Bnc Flow Meter

The **Malema USC-801-2 Ultrasonic Flowmeter** is a high-performance, versatile industrial flow measurement solution designed to deliver precise and reliable monitoring of liquid flow rates in a wide range of applications. Operating on a **24V DC** power supply, this compact yet robust device integrates cutting-edge **ultrasonic Doppler technology** to provide accurate flow measurements with minimal maintenance requirements. Its **BNC and RS-485 communication interfaces** ensure seamless integration into existing automation systems, enabling real-time data transmission, remote monitoring, and seamless connectivity with PLCs, SCADA systems, or other industrial controllers. The **RS-485 interface**, in particular, offers a robust, long-distance communication option, making it ideal for harsh or remote environments where signal integrity is critical.

One of the standout features of the USC-801-2 is its **dual-alarm functionality**, which enhances operational safety and efficiency by providing configurable alerts for critical flow conditions. Whether monitoring for **low-flow scenarios** (such as potential blockages or system failures) or **high-flow anomalies** (indicating potential leaks or overloading), the flowmeter s programmable alarms allow operators to take immediate corrective action, reducing downtime and preventing costly damage. The alarms can be customized to trigger based on predefined thresholds, ensuring proactive system management.

Built to withstand demanding industrial environments, the Malema USC-801-2 is constructed with **durable materials** and features an **IP67-rated enclosure**, making it resistant to dust, water ingress, and harsh operating conditions. This makes it an excellent choice for applications in **water treatment plants, HVAC systems, chemical processing, food and beverage production, and irrigation systems**, where reliability and accuracy are non-negotiable. The device s **wide measurement range** and **high-frequency ultrasonic sensors** ensure consistent performance across varying flow velocities, from slow trickling to high-pressure streams, while its **low-power consumption** makes it energy-efficient for continuous operation.

The flowmeter s **user-friendly interface** simplifies setup and configuration, allowing for easy calibration and parameter adjustments via its **LED indicators and RS-485 communication protocol**. Compatible with **Modbus RTU**, the device supports standard industrial communication protocols, ensuring compatibility with most automation platforms. Additionally, its **compact and modular design** allows for flexible installation, whether mounted directly on pipelines or integrated into existing control panels. With its **high accuracy, durability, and advanced alarm capabilities**, the Malema USC-801-2 is an indispensable tool for industries requiring precise, real-time flow monitoring with minimal operational overhead.

### **Pros and Cons of the Malema USC-801-2 Ultrasonic Flowmeter (24V DC, BNC, RS-485, 2-Alarms)**

1. **Ultrasonic Measurement Principle** Non-invasive and non-intrusive, meaning it does not require pipe interruption or flow interruption, reducing downtime and maintenance costs. It works by measuring the time difference of ultrasonic signals traveling with and against the flow.

2. **Wide Range of Applications** Suitable for measuring liquid flow in various industries, including water treatment, HVAC systems, chemical processing, and industrial piping. It can handle both clean and slightly contaminated fluids (depending on the sensor type).

- **BNC Output (Analog, 0-20mA or 4-20mA)** Useful for direct connection to PLCs, data loggers, or analog displays.

- **RS-485 (Digital Communication)** Enables long-distance communication (up to 1.2 km) and integration with SCADA systems, PLCs, or computers for remote monitoring and data logging.

4. **Two Built-in Alarms** Allows for setting high/low flow alarms or fault conditions, improving system safety and operational efficiency. This can trigger alerts for abnormal flow rates or equipment failures.

5. **Compact and Rugged Design** The unit is likely designed for industrial environments, offering durability against vibrations, temperature fluctuations, and moisture (IP65 or similar rating, though exact specifications should be verified).

6. **Low Power Consumption (24V DC)** Operates efficiently on standard industrial power supplies, reducing energy costs and simplifying wiring.

7. **Easy Installation** Clamp-on sensors eliminate the need for pipe cutting or internal modifications, speeding up installation and reducing costs.

8. **Accurate and Reliable Measurements** Ultrasonic flowmeters generally provide high accuracy ( 1% to 2% of reading) and repeatability, especially when properly calibrated.

9. **Maintenance-Free Operation** No moving parts inside the sensor, reducing wear and tear and extending the lifespan of the device.

10. **Compatibility with Common Systems** RS-485 support ensures compatibility with most industrial communication protocols, making it easy to integrate into existing control systems.

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1. **Limited to Liquid Flow Only** Unlike turbine or vortex flowmeters, ultrasonic flowmeters are not suitable for measuring gas flow or steam. This restricts their use to liquid applications only.

2. **Dependence on Pipe Material and Condition** Ultrasonic sensors require a smooth, clean pipe surface for accurate readings. Rough, corroded, or lined pipes can degrade performance. The USC-801-2 may not work well with pipes made of certain materials (e.g., very thin or highly reflective surfaces).

3. **Temperature and Pressure Limitations** While ultrasonic flowmeters can handle a wide range of temperatures and pressures, the exact limits of the USC-801-2 should be checked. Extreme conditions (e.g., high-pressure steam or corrosive liquids) may require special sensors or materials.

4. **Signal Attenuation in Contaminated Fluids** Heavy particulate matter, bubbles, or foam in the fluid can interfere with ultrasonic signal transmission, leading to inaccurate readings or signal loss. The USC-801-2 may not be ideal for highly turbulent or dirty fluids without proper sensor selection.

5. **Calibration Requirements** Ultrasonic flowmeters may require periodic recalibration to maintain accuracy, especially if the fluid properties (e.g., velocity, density) change over time.

6. **Limited Flow Range** The USC-801-2 may have specific minimum and maximum flow rate limits. Very low flows (e.g., trickle flow) or extremely high velocities may not be measurable accurately.

7. **Cost of Installation and Setup** While the initial purchase price may be reasonable, the cost of proper installation (e.g., sensor positioning, calibration, and wiring) can add up. Incorrect sensor placement (e.g., near bends or valves) can lead to inaccurate readings.

8. **Potential for Signal Interference** In noisy industrial environments, electromagnetic interference (EMI) or radio frequency interference (RFI) could affect the RS-485 or BNC signals, requiring shielding or filtering.

9. **Limited Support for Complex Fluids** Fluids with high viscosity, non-Newtonian properties, or significant vapor content may not be measured accurately without specialized sensors or adjustments.

10. **Vendor-Specific Software Dependency** If the USC-801-2 requires proprietary software for configuration or data logging, this could create dependency on the manufacturer s tools, potentially limiting flexibility.

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The **Malema USC-801-2 Ultrasonic Flowmeter** is a versatile, non-invasive, and low-maintenance solution for measuring liquid flow in industrial applications. Its **BNC and RS-485 outputs**, along with **two built-in alarms**, make it suitable for systems requiring both analog and digital communication. The clamp-on design simplifies installation, and its rugged construction ensures reliability in harsh environments.

However, its **limitations in handling contaminated fluids, gases, or extreme conditions**, along with potential **calibration and installation challenges**, should be carefully considered. If your application involves **clean or moderately clean liquids** with **steady flow rates** and **no significant particulate matter**, this flowmeter is a strong choice. For **highly turbulent, corrosive, or gaseous media**, alternative technologies (e.g., magnetic, turbine, or vortex flowmeters) may be more appropriate.

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- You need a **non-invasive, low-maintenance flowmeter** for **liquid applications** (e.g., water, chemicals, HVAC systems).

- Your system requires **both analog (BNC) and digital (RS-485) outputs** for integration with PLCs or SCADA.

- The fluid is **relatively clean** (minimal particulate or bubbles) and the pipe material is suitable for ultrasonic sensing.

- You require **two alarms** for flow monitoring or fault detection.

- Budget and installation constraints favor a **clamp-on, no-interruption solution**.

- You are measuring **gases, steam, or highly viscous fluids**.

- The fluid is **extremely dirty, foamy, or contains large particles** that could interfere with ultrasonic signals.

- The pipe material is **not ideal for ultrasonic sensing** (e.g., very thin, lined, or highly reflective surfaces).

- You need **high-precision measurements in extreme temperature/pressure conditions** without additional sensors.

- You require **long-term calibration-free operation** without periodic verification.

- For **dirty or abrasive liquids**, consider a **magnetic flowmeter** (e.g., Magflow or similar).

- For **gas or steam applications**, a **vortex or turbine flowmeter** may be more suitable.

- For **high-accuracy critical applications**, a **correlation or Doppler ultrasonic flowmeter** might be preferable.

**Final Verdict:** The USC-801-2 is a **solid choice for many industrial liquid flow applications**, especially when cost, ease of installation, and dual communication outputs are priorities. However, **thoroughly verify the fluid and pipe conditions** before purchase to ensure optimal performance.

Details:

Model: USC-801-2. Excellent Condition. MFR: F07-720193-2-2. Ultrasonic Flowmeter.

Power: 24VDC.

part #: usc8012 prices

• $37.82-$112.00

specifications pneumativalv:

• brand: Malema
• mpn: Usc-801-2
• country of origin: Japan
• flow meter type: Ultrasonic

shipping pneumativalv:

• transit: 4-7 Days
• cost: $9.95
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• # reviews: 1498
• city: Santa Rosa, California
• rating: 100.0%

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• started: May 15, 2026
• quantity: 1
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general pneumativalv:

• condition: Used
• Pump Flow Controllers > Flow Controllers Meters > Flow Meters

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