NBL-L-SMP4631 Series RS485/HART/Explosion-Proof Intelligent Split-Type Level Transmitter Sensor

NBL-L-SMP4631 Intelligent Split-Type Level Transmitter: RS485/HART Industrial-Grade Water Level Monitoring Expert

NBL-L-SMP4631 Intelligent Split-Type Level Transmitter Overview

The NBL-L-SMP4631 series intelligent split-type level transmitter not only inherits the high-precision characteristics of hydrostatic level measurement but also achieves a leap-forward innovation in structure. Through the "split-type" design, the precision sensing component (sensor) is separated from the processing and display component (electronic circuit housing). The sensor part is deeply submerged in the liquid to capture minute pressure changes, while the explosion-proof cast aluminum housing is installed in a safe location convenient for personnel observation and wiring, equipped with a high-performance LCD or LED digital display screen, making level data clear at a glance.

Relying on advanced intelligent digital compensation and correction technology, the NBL-L-SMP4631 series can accurately convert the sensed pressure signal into RS485 Modbus or HART protocol signals, providing a solid digital foundation for IoT integration and Industry 4.0 automated control.

Intelligent Split-Type Level Transmitter Excellent Technical Features and Product Advantages

1. Digital Intelligent Compensation Technology
Unlike traditional analog circuits, NBL-L-SMP4631 uses a digital processing chip to perform real-time compensation for the sensor's nonlinearity and temperature drift. This ensures that measurement results maintain high linearity and authenticity over an extremely wide temperature range.

2. Split-Type Cast Aluminum Explosion-Proof Structure
Dual protection: The sensor probe has IP68 submersible-grade protection, while the ground display control box adopts an explosion-proof cast aluminum housing (IP65), effectively resisting UV rays, rainwater, and corrosive gases in open-air environments.
Flameproof rating: Complies with Ex d ⅡB T6 Gb standard, ideal for flammable and explosive areas such as petroleum and chemical industries.

3. Rich Communication Protocol Integration
RS485 Modbus: Supports long-distance, multi-node networking, can directly connect to PLC, configuration software, and IoT cloud platforms.
HART Protocol: Supports superimposing digital signals on 4-20mA analog signals, compatible with global mainstream HART fieldbus management systems.

4. Highly Adaptive Measuring Element
The sensing core adopts 316L stainless steel corrugated diaphragm, combined with fluororubber seals, showing excellent compatibility and long-term fatigue resistance for most industrial fluids and river water qualities.

Intelligent Split-Type Level Transmitter Core Technical Parameters Detailed Table

Intelligent Split-Type Level Transmitter Application Scenarios

Hydrological Exploration and River Monitoring

In open-air river channels or remote hydrological stations, the split-type design of NBL-L-SMP4631 allows the sensor to be placed on the riverbed while installing the display instrument in a protective box on the shore, facilitating direct data reading by maintenance personnel. At the same time, the RS485 interface can easily connect to wireless GPRS transmission terminals.

Industrial Liquid Tanks and Sewage Systems

For acid-base storage tanks (within compatibility) or drainage systems in industrial plants, where the environment is often filled with steam or volatile gases, the combination of explosion-proof cast aluminum housing and high-precision 316L diaphragm ensures measurement accuracy while greatly extending system life under harsh conditions.

Marine Monitoring and Groundwater Level

For marine environments with certain corrosiveness and salinity, NiuBoL's optimized sealing process and fluororubber rings effectively prevent medium leakage, enabling long-term monitoring of subtle changes in groundwater levels and providing data support for water resource management.

Intelligent Split-Type Level Transmitter Wiring and Installation Guide

1. Installation Method

• Probe part: Should be vertically immersed at the bottom of the liquid. If the flow rate is fast, use a steel pipe or weight for fixation.

• Display box part: Recommended to be vertically hung or fixed on a wall or pole via bracket, ensuring the wiring port faces downward to prevent rainwater ingress.

2. Electrical Connection

According to different models, the wiring definitions are as follows:

• RS485 output: Corresponds to power positive/negative poles and A, B communication lines.

• 4-20mA (two-wire system): Simple wiring, only requires power positive and signal return line.

• HART type: Ensure loop resistance is above 250 ohms to guarantee successful communication handshake.

FAQ:

Q1: What are the core advantages of the split-type structure compared to the integrated type?
A: The biggest advantage lies in the convenience of local observation and maintenance. Integrated sensors cannot directly display readings in deep wells or closed tanks, whereas the split-type display head of NBL-L-SMP4631 can be installed at eye level, and the electronic circuit is kept away from liquid high temperature or high humidity areas, resulting in longer lifespan.

Q2: How to ensure the level transmitter is not damaged in thunderstorms?
A: NiuBoL has built-in secondary lightning protection in the circuit design. At the same time, we recommend users to protect the air-guide cable with conduit during installation and ensure reliable grounding of the yellow ground terminal on the housing.

Q3: Can the air-guide cable be cut or extended by oneself?
A: Strictly prohibit privately cutting the air-guide cable. This dedicated cable contains an internal vent tube used to offset atmospheric pressure deviations. If a longer distance is needed, specify the length to NiuBoL when ordering. If extension is necessary on-site, professional waterproof breathable junction boxes must be used.

Q4: Which registers in the Modbus protocol does this sensor support?
A: The product supports standard Modbus-RTU read-only and read-write instructions, allowing reading of real-time pressure values, level values, and modification of slave address, baud rate, and other parameters. A detailed communication protocol manual is provided with the product.

Summary:

The NiuBoL NBL-L-SMP4631 series intelligent split-type level transmitter is more than just a measurement tool; it is a bridge for precise perception and data transmission in the era of industrial IoT. From high-precision diffused silicon chips to robust explosion-proof cast aluminum housings, from basic analog signals to advanced RS485/HART digital protocols, every detail reflects NiuBoL's ultimate pursuit of quality.

Do you need compatibility evaluation for specific media (such as fuel, industrial wastewater, etc.)? Or do you need a specific Modbus register table for system integration? Please feel free to inform us, and we will provide you with in-depth technical data support.