Magnetic Level Gauge With Profibus/Modbus Output

Traditional magnetic level gauges with alarm switches only provide discrete switch signals for overflow prevention; the 4–20mA remote transmission type adopts analog signal transmission, which can only transmit single liquid level data per instrument, cannot upload temperature, instrument status, fault codes synchronously, and requires independent wiring for every set of instruments. When dozens or hundreds of tank instruments need centralized networking management, analog wiring will bring high construction cost, complex circuit layout and difficult later maintenance.

Our digital bus magnetic level gauge breaks the limitation of analog signal transmission. Based on standard side-mounted magnetic level gauge main body, it is matched with intelligent digital transmitter supporting Modbus-RTU and Profibus DP dual protocols. Multiple liquid level gauges can be connected in series on one bus cable to form a network, greatly reducing field wiring workload and construction investment. Apart from real-time liquid level values, it can synchronously upload equipment working state, fault alarm codes, medium temperature data, calibration parameters and other multidimensional information to upper industrial control system, realizing intelligent diagnosis of instrument faults, automatic data recording and tank inventory big-data statistics.

Different from 4–20mA analog products focused on single-point level remote transmission, this digital bus version centers on smart factory networking, multi-device centralized access and IoT intelligent management. Compared with reed switch type magnetic level gauges used for simple PLC interlock, it realizes two-way communication: not only upload liquid level data, but also receive remote calibration, parameter modification commands issued by the control room. It is the preferred measuring instrument for new intelligent chemical park, unattended tank zone and digital factory upgrading projects.

• Dual Digital Bus Protocols Optional (Modbus-RTU / Profibus DP) Support mainstream industrial bus protocols; Modbus for conventional intelligent transformation, Profibus DP for large petrochemical automated production lines, seamlessly access SCADA, DCS and industrial IoT platforms.
• Bus Networking Connection, Greatly Reduce Wiring Cost Up to 32 sets of magnetic level gauges can be mounted on one bus loop, eliminating independent wiring for each instrument like 4–20mA analog transmitters, saving cable materials and construction labor costs.
• Multi-dimensional Data Synchronous Upload & Two-way Communication Upload real-time liquid level, equipment running status, fault alarm information, medium temperature, internal calibration data simultaneously; support remote calibration, parameter configuration and zero-point adjustment from control room without on-site manual debugging.
• Local Visual Display + Digital Intelligent Control Dual System Retain bicolor magnetic flap on-site liquid reading function for field inspection; digital bus realizes remote centralized monitoring and automatic management, satisfying both field maintenance inspection and unmanned workshop management demands.
• Full-series Corrosion-resistant Wetted Material Configuration Chamber, flange and float optional 304SS, 316L, Titanium, Hastelloy C276, Inconel 625, 310S materials, adapt high temperature, high pressure, vacuum and strong corrosive chemical medium working conditions.
• Classified high-temperature adaptation scheme Nylon aluminum flaps resist up to 150℃ for normal temperature storage tanks; all-metal flaps withstand 400℃ high temperature for high-temperature reaction vessels. The digital transmitter is isolated with heat insulation structure when medium temperature exceeds 120℃ to protect electronic modules.
• Strong anti-interference digital transmission Digital signal transmission avoids analog signal drift and signal attenuation caused by long-distance transmission, stable data transmission in electromagnetic interference environment such as power workshops and chemical factories.
• Function expansion compatible with alarm switches Reserve installation positions for passive alarm switches, users can configure high/low liquid level limit alarm function on the basis of digital networking.

This digital bus magnetic level gauge inherits the pressure-resistant and corrosion-resistant structure of standard magnetic level gauges, and is equipped with intelligent bus transmitters to realize digital networking communication. Detailed parameters are shown in the table below:

This digital bus magnetic level gauge is positioned for intelligent networking and digital factory construction scenarios, widely used in industries requiring multi-tank unified networking management:

• Intelligent Petrochemical Tank Farm Network all storage tank level instruments uniformly through bus cables, realize centralized monitoring of dozens of oil tanks, automatic inventory statistics and overflow early warning linkage.
• New Chemical Digital Factory Reaction kettles, batching tanks are connected to factory IoT system via Profibus bus, realize remote parameter debugging and automatic production management.
• Energy & Power Intelligent Auxiliary Workshop Condensate tanks, demineralized water tanks in power plants form bus network, cooperate with SCADA system to realize unattended water supply control.
• Fine Chemical & Pharmaceutical Automated Workshop Modbus networking access workshop control system, record full-cycle liquid level data of batching tanks to realize batch production traceability.
• Large Environmental Protection Sewage Treatment Plant Multiple regulating tanks and clean water tanks share one bus loop, reduce wiring cost of sewage plant reconstruction, realize intelligent pump group linkage control.

Q1: What is the difference between digital bus version and 4–20mA analog output magnetic level gauge?

A: The 4–20mA type is analog single signal output, one instrument needs one set of signal lines, only transmit liquid level data. Modbus/Profibus digital version supports multi-instrument series connection on one bus cable, can upload liquid level, equipment fault status, temperature and multiple groups of data, support remote parameter modification, more suitable for large-scale intelligent networking transformation of tank areas.

Q2: Which protocol should I choose, Modbus-RTU or Profibus DP?

A: Modbus-RTU has strong universality and low cost, applicable for most industrial intelligent transformation projects; Profibus DP has higher communication speed and stronger anti-interference performance, recommended for large petrochemical plants, continuous production lines with high real-time requirements.

Q3: Will high temperature medium damage the digital bus transmitter?

A: The measuring cylinder and float can withstand 400℃ high temperature medium. The bus transmitter electronic module is limited to 120℃ ambient temperature. When medium temperature exceeds 120℃, we adopt isolated heat insulation bracket structure to isolate heat conduction, guarantee long-term stable operation of the transmitter.

Q4: Can digital bus level gauges be installed together with original 4–20mA instruments in the same control system?

A: Yes. The control system can be equipped with both analog acquisition modules and bus communication modules to access two types of instruments simultaneously, realizing gradual intelligent reconstruction of old factories without full replacement of equipment.

Q5: Can this level gauge still work normally after adding alarm switches?

A: It reserves guide rail installation positions for alarm switches. After assembling passive alarm switches, it can realize digital network transmission + high/low liquid level limit interlock alarm at the same time, dual safety guarantee for storage tanks.

Traditional analog wiring for large tank areas will bring high construction cost and complicated later maintenance problems. Our Modbus & Profibus digital bus magnetic level gauge supports multi-instrument bus networking access, reduces wiring investment by more than 60%, and realizes liquid level monitoring, equipment fault diagnosis and production data traceability synchronously, which is a cost-effective solution for intelligent upgrading of tank farms and factories.

Submit your tank quantity, communication protocol type, medium temperature & pressure parameters and intelligent transformation demands, our technical team will design targeted bus networking layout scheme and provide factory quotation for you.

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