NBL-L-SMP4603 Submersible Level Transmitter Sensor 4-20mA

NiuBoL NBL-L-SMP4603 Submersible Level Transmitter: High-Precision Industrial-Grade Water Level Monitoring Solution

In modern industrial and hydrological monitoring, precise control of liquid depth is the core to ensuring system safety and efficiency. The NBL-L-SMP4603 series general-purpose submersible level transmitter launched by NiuBoL is a highly reliable monitoring device based on the hydrostatic measurement principle.

The sensor uses a high-performance diffused silicon pressure sensor as the measuring element. It senses the hydrostatic pressure generated by the liquid depth (proportional to the depth) and converts it into standard current (4-20mA) or voltage (0-5V/0-10V) signals through a high-precision signal conditioning circuit. This design not only ensures real-time measurement but also greatly enhances the long-distance transmission capability of the signal.

From component screening to semi-finished product testing, and to strict aging screening of finished products, NiuBoL ensures that every NBL-L-SMP4603 can operate stably in complex outdoor or industrial environments.

NBL-L-SMP4603 Submersible Level Transmitter Core Advantages and Technical Features

1. Excellent Material and Protection Performance
The entire body of NBL-L-SMP4603 is made of 316L stainless steel, offering extremely strong corrosion resistance. Its structure features a tight sealing design with an IP68 protection rating, allowing long-term immersion in water or other compatible media.

2. Powerful Overload Protection Capability
To cope with instantaneous pressure fluctuations caused by pump valve start/stop, the transmitter is designed with extremely high overpressure protection. Products with ranges above 5 mH₂O have more than 2 times overpressure capability; for small ranges below 5 meters, the overpressure protection reaches up to 5 times, effectively preventing accidental damage to the sensor diaphragm.

3. Advanced Circuit Protection Design
Built-in anti-interference and lightning protection circuits can resist complex electromagnetic interference and induced lightning strikes in harsh weather, ensuring continuity and accuracy of data acquisition.

4. Authoritative Explosion-Proof Certification
For high-risk industries such as petroleum and chemical, NBL-L-SMP4603 provides dual explosion-proof guarantees:
Flameproof mark: Ex d ⅡB T6 Gb
Intrinsically safe mark: Ex ia ⅡC T6 Ga
This enables safe deployment in flammable and explosive gas environments.

NBL-L-SMP4603 Submersible Level Transmitter Detailed Technical Parameters Table

Submersible Level Transmitter Application Fields: From Urban Lifelines to Industrial Heartlands

The versatility of NBL-L-SMP4603 makes it the preferred tool for level monitoring in multiple industries:

• Urban water supply and wastewater treatment: Real-time monitoring of underground reservoirs, water towers, and sewage lifting stations for automated drainage and water supply scheduling.

• Hydrological exploration and hydraulic engineering: Used for dynamic recording of water levels in rivers, lakes, and reservoirs, providing key data support for flood control and disaster mitigation.

• Petroleum and chemical industry: Precise measurement of oil or chemical medium levels in storage tanks and reactors, with explosion-proof features ensuring production safety.

• Power and pump rooms: Paired with hydraulic equipment to control level balance in industrial cooling circulation systems.

Electrical Connection and Wiring Specifications

To ensure smooth installation, please strictly follow the following wire color definitions for wiring. NiuBoL uses standardized industrial cables to enhance on-site construction identification.

Two-Wire System (4-20mA DC)

The two-wire system is the simplest, with signal and power sharing the same loop, suitable for long-distance transmission.

• Black wire: Power positive (+V)

• Red wire: Signal output (+OUT)

• Yellow wire: Ground wire

Three-Wire System (0-5V/0-10V DC)

The three-wire system is typically used for voltage signal acquisition systems.

• Black wire: Power positive (+V)

• Red wire: Signal output positive (+OUT)

• Blue wire: Common terminal (GND)

• Yellow wire: Ground wire

Note: The air-guide cable provided with the transmitter contains a vent tube. During installation, do not bend or block it, and keep the cable end ventilated and dry to balance the back pressure of the diaphragm with atmospheric pressure.

Submersible Level Transmitter Selection and Installation Recommendations

How to Choose the Appropriate Range?

When selecting, it is recommended that the range should be 10%-20% higher than the actual maximum liquid level. For example, if the pool depth is 8 meters, choose a 0-10 mH₂O range. NiuBoL offers customizable ranges from 1 meter to 200 meters.

Installation Precautions

• Hydrostatic installation: When installing in flowing water (such as rivers or containers with stirrers), it is recommended to place the sensor in a steel pipe for fixation and drill holes at different heights on the pipe to reduce direct impact of water flow on the diaphragm.

• Verticality: The sensor should be vertically immersed at the bottom of the liquid to avoid tilt causing static pressure calculation deviation.

• Avoid strong magnetic fields: Installation location should be kept away from electromagnetic interference sources such as frequency converters and high-power motors.

FAQ:

Q1: Can NBL-L-SMP4603 measure corrosive liquids?
A1: The wetted materials of this product are 316L stainless steel and fluororubber. As long as the medium is non-corrosive to these two materials (such as fresh water, weak acids and alkalis, fuel, etc.), it can be used with confidence. For highly corrosive liquids, please contact NiuBoL for custom special anti-corrosion coatings.

Q2: Can the cable length be extended? Will it cause signal loss?
A2: Yes. For 4-20mA signals, due to their strong anti-interference capability, transmission distances can reach thousands of meters without significant attenuation. When placing an order, you can customize the dedicated air-guide cable with specific lengths according to on-site needs.

Q3: Why is there a tube inside the sensor cable?
A3: This is the vent tube. Its function is to connect the back of the pressure-sensing diaphragm inside the sensor to the atmosphere, thereby canceling out measurement errors caused by atmospheric pressure changes. During installation, ensure that the end of the vent tube does not get water ingress.

Q4: Does this sensor support digital protocols such as RS485?
A4: NBL-L-SMP4603 is mainly for 4-20mA and voltage-type analog outputs. If you need RS485 (Modbus-RTU) protocol, NiuBoL has other series of digital products available.

Summary: NiuBoL Empowers Intelligent Liquid Monitoring

The NBL-L-SMP4603 submersible level transmitter stands out among numerous level sensing devices with its high-reliability 316L stainless steel material, dual explosion-proof certification, and excellent overload resistance. It is not just a sensor but a core component of the stable, precise, and cost-effective level control solutions that NiuBoL provides to global customers.

Whether for deep well water level monitoring or complex chemical level control, NBL-L-SMP4603 can assist your digital upgrade with professional performance.

Are you currently looking for selection support for a specific project? You can contact us and inform us of your measurement medium and depth requirements, and we will provide you with a detailed customized solution.