Nexisense Submersible Level Transmitter Installation and Safe Use – Comprehensive Analysis

I. Overview of Submersible Level Transmitters

A submersible level transmitter, also known as a submersible level gauge, is a pressure-type level measurement instrument that indirectly reflects liquid level height by measuring liquid static pressure. Its core advantages include a compact structure, flexible installation, and strong adaptability, making it especially suitable for continuous level monitoring in deep wells, water tanks, reservoirs, rivers, and storage vessels.

Nexisense submersible level transmitters are designed with full consideration of on-site installation convenience and long-term reliability. The overall structure features a slender cylindrical shape, with the probe end permanently immersed in the measured medium. Pressure signals are stably transmitted to the signal processing unit through a dedicated sealed vented cable, and the products are widely used in industrial and municipal engineering projects.

II. Working Principle and Measurement Fundamentals

Physical Relationship Between Level, Pressure, and Density

Submersible level transmitters are based on the classical hydrostatic pressure measurement principle:

Liquid level pressure = liquid density × gravitational acceleration × liquid level height

Under the premise that liquid density and gravitational acceleration remain relatively stable, the pressure value is linearly proportional to the liquid level height. The level transmitter uses a high-precision pressure sensor to convert the pressure exerted by the liquid on the probe into an electrical signal and outputs it as a standard industrial signal.

Signal Output and System Integration

Nexisense submersible level transmitters typically support the following output types:

4–20 mA current signal
0–10 V voltage signal
RS485 (Modbus RTU) communication protocol

They can be directly connected to PLC, DCS, SCADA systems, or IoT monitoring platforms to enable remote monitoring, data logging, and alarm linkage.

III. Structural Design and Engineering Adaptability

Core Structural Components

Probe section: built-in isolation diaphragm for sensing liquid static pressure
Pressure inlet hole structure: optimized position and angle through multiple fluid simulations and field tests to reduce blockage risk
Sealed housing: stainless steel or corrosion-resistant alloy materials suitable for various media
Dedicated vented cable: waterproof and leak-proof design, enabling pressure compensation

Anti-Clogging and Long-Term Submersion Design

For media containing sediment, impurities, or light suspended solids, Nexisense adopts a protective structure at the probe end. Liquid enters the measurement chamber through side pressure inlet holes, effectively preventing solid particles from directly impacting the diaphragm, thereby reducing measurement distortion and maintenance frequency.

IV. Typical Installation Methods for Submersible Level Transmitters

Depending on the state of the on-site medium, installation methods for submersible level transmitters are mainly divided into static level installation and flowing level installation.

1. Installation Method in Static Liquid Level Applications

In open tanks, water pools, and storage vessels with static or near-static liquid levels, installation is relatively straightforward:

Insert the transmitter probe vertically to the bottom of the container
Ensure the probe is fully submerged in the liquid
Secure the cable or junction box at the top of the container using nylon ties, fixing clamps, or adjustable tripod brackets
Ensure the cable hangs naturally and avoid concentrating tensile force on the probe end

This installation method is suitable for clean water tanks, fire water tanks, rainwater collection basins, and similar applications.

2. Installation Method in Flowing Liquid Level Applications

In rivers, pipelines, circulating water tanks, or conditions with significant liquid flow and fluctuation, additional measures are required to ensure measurement stability.

Method 1: Still Pipe Installation
Place a vertical steel pipe with an inner diameter larger than the probe diameter into the liquid
Drill multiple small holes at different heights on the pipe wall facing away from the flow direction
Allow liquid to slowly enter the pipe through the holes, forming a relatively stable liquid column
Position the submersible level transmitter probe at the bottom of the pipe

This method effectively reduces the influence of flow velocity and surging on measurement values.

Method 2: Bottom Damping Device Installation
Install a damping cover or filter device at the probe bottom
Used to eliminate water flow impact, dynamic pressure, and wave interference
Also intercepts sediment to reduce the risk of pressure inlet blockage

3. Installation Direction and Position Requirements

Regardless of operating conditions, the following basic principles should be followed:

Installation direction must be vertically downward
Installation position should be far from liquid inlets and outlets
Avoid proximity to agitators, pump suction inlets, and other strong disturbance areas
In vibrating environments, steel wires or vibration-damping devices may be used for auxiliary fixation

V. Key Checks Required Before Installation

Before formally installing a submersible level transmitter, the following three points must be carefully verified:

Medium compatibility
The corrosiveness, temperature, and chemical properties of the measured medium must be compatible with the transmitter materials.

Pressure inlet hole unobstructedness
The medium should not contain fibrous or highly adhesive impurities that could easily block the pressure inlet holes.

Range matching
The maximum static pressure generated by the actual liquid level must not exceed the transmitter’s rated range to prevent damage to the sensing element.

VI. Safety Usage Specifications for Submersible Level Gauges

Submersible level gauges typically operate submerged in liquid for extended periods. Proper usage is critical to ensuring service life and accuracy.

1. Protect the Isolation Diaphragm

The isolation diaphragm inside the pressure inlet is extremely sensitive. Do not touch, scratch, or clean it with hard objects.

2. Handling and Installation Precautions

Avoid strong impacts or dropping
Do not suspend additional weights using the cable
Do not forcibly position the probe by pulling the cable

3. Electrical Connection Specifications

Strictly follow the product wiring instructions
Incorrect wiring may directly damage the amplifier circuit
It is recommended to perform wiring operations with power disconnected

4. Maintenance and Fault Handling

If abnormalities occur, contact Nexisense technical support promptly
Users are prohibited from disassembling or repairing the device themselves
The probe should be cleaned of sediment regularly to prevent pressure inlet blockage

5. Cable Protection Requirements

Submersible level gauges use dedicated waterproof cables. At the installation site, avoid:

Abrasion
Puncturing
Long-term compression or friction against sharp edges

Protective conduits or sleeves should be added when necessary.

VII. Frequently Asked Questions (FAQ)

Can submersible level transmitters be used for corrosive media?
Yes, but appropriate corrosion-resistant material models must be selected, and compatibility of seals and diaphragm materials must be confirmed.

What should be done if data is unstable due to large level fluctuations?
It is recommended to use still pipe or damping installation methods and to set appropriate filtering and sampling cycles in the system.

Is periodic calibration required?
For long-term high-precision applications, periodic zero and full-scale calibration is recommended to ensure measurement accuracy.

Conclusion

Due to their simple structure, flexible installation, and strong adaptability, submersible level transmitters have become one of the fundamental devices in industrial level measurement. Proper installation methods, correct matching with operating conditions, and standardized safety usage are the core factors ensuring long-term stable operation.

With mature anti-clogging structural design, reliable sealing processes, and stable signal output performance, Nexisense submersible level transmitters provide continuous and accurate data support across various complex level conditions, forming a solid foundation for industrial automation and intelligent monitoring systems.