Fire Water Tank Level Display Device: Reliable Choice for System Integrators

Nexisense fire water tank level display device is specially designed for fire water supply systems, meeting the requirements of GB 50974-2014 "Technical Code for Fire Water Supply and Hydrant Systems" for fire water tank water level display and alarm. The device consists of a highly reliable submersible sensor and a control room display instrument, achieving stable signal transmission through a 4-20mA current loop. It is suitable for real-time water level monitoring and remote management of various building fire water tanks and water boxes.

In actual projects, system integrators and engineering contractors often face problems such as scattered water tanks, long transmission distances, and complex environments. The Nexisense solution provides a complete link support from on-site collection to control center display through intelligent signal processing circuits and industrial-grade protection design, helping project teams reduce wiring difficulty and improve system stability.

Product Composition and Working Principle

The device mainly includes two parts: a submersible level sensor and a multifunctional display instrument. The sensor adopts the hydrostatic measurement principle, placed at the bottom of the water tank, converting liquid static pressure into electrical signals. It uses the WHSENSORS brand sensing chip, which is processed by an intelligent amplification circuit and outputs a standard 4-20mA signal. After receiving the signal, the display instrument simultaneously outputs bar graph analog display and digital precise reading, and supports high and low liquid level threshold setting and alarm relay output.

This design ensures that the signal maintains linearity and anti-interference ability during long-distance transmission, suitable for different installation scenarios such as underground fire water tanks and high-level water tanks.

Core Technical Advantages

The Nexisense fire water tank level display device demonstrates the following features in engineering applications:

• Long-distance stable transmission: Adopts a dedicated intelligent amplification circuit, supporting lossless transmission up to 5000 meters, reducing intermediate relay equipment, and lowering system complexity and cost.

• High protection and environmental adaptability: IP68 protection rating, combined with 304/316L stainless steel housing and multi-seal technology, resistant to long-term immersion and harsh working conditions. Temperature compensation range -20~85℃ ensures measurement consistency in different seasons and regions.

• Flexible accuracy configuration: Provides three accuracy options of 0.1%FS, 0.25%FS, and 0.5%FS. The project party can match them according to project acceptance standards and budget.

• Installation and integration convenience: The sensor adopts submersible installation, and the display instrument only requires two-wire connection. It supports standard 4-20mA input interface and can be directly connected to PLC, DCS, fire alarm host or IoT edge module to achieve data acquisition and linkage control.

• Electrical protection design: Built-in triple lightning protection module, short circuit protection, and reverse polarity protection. Electromagnetic compatibility complies with relevant industrial standards, improving system reliability in lightning-prone areas or strong electromagnetic environments.

These features make the device particularly suitable for large-scale park projects, multi-water-tank parallel projects, and scenarios that need to be integrated with existing fire automation systems.

Technical Parameters

The following are the main technical parameters of the Nexisense fire water tank level display device:

Parameters can be customized and adjusted according to specific project requirements. Engineering teams are welcome to provide on-site working conditions for selection confirmation.

Installation and System Integration Guide

For system integrators, installation simplicity directly affects project progress. The Nexisense device adopts a standard submersible installation method:

1. Place the sensor vertically at the fixed position at the bottom of the fire water tank or water box, ensuring the probe is away from the water inlet and stirring area to reduce fluctuation effects.

2. Use shielded cable (recommended 2×1.5mm²) to connect the sensor and the control room display instrument, with positive pole connected to the signal line and negative pole to the power ground.

3. Install the display instrument on the fire control center panel. After power-on, perform zero point and range calibration, and set high and low liquid level alarm thresholds.

4. The 4-20mA output signal can be connected in parallel to various upper systems, supporting multi-point display or linkage with sound and light alarm devices.

The entire process requires no complex programming or special tools. Ordinary electrical engineers can complete it, significantly shortening on-site debugging time. In projects with existing PLC or SCADA systems, it can be directly accessed as an analog input channel without additional protocol conversion modules.

Typical Application Scenarios

• Underground fire water tanks and rooftop high-level water tanks monitoring in large commercial complexes, hospitals, schools and other buildings.

• Centralized monitoring of multiple dispersed fire water storage facilities in industrial parks.

• Projects that need to be integrated with smart fire protection platforms or IoT edge gateways.

• Municipal or energy industry fire systems with high requirements for transmission distance and anti-interference capability.

In these scenarios, the device can help project contractors meet the compliance requirements of "the fire control center should display water level in real time and have high and low alarm functions" in fire acceptance, while providing stable data support for later operation and maintenance.

Frequently Asked Questions (FAQ)

Q1. How does the fire water tank level display device ensure signal accuracy at a 5000-meter transmission distance?

A1. The device adopts a dedicated intelligent amplification circuit combined with shielded cable. In 4-20mA current loop mode, it effectively suppresses the influence of line resistance and electromagnetic interference. Actual engineering tests show that the signal error after long-distance transmission is still controlled within the SGS-certified 0.009mA range, meeting the acceptance standards of most fire projects.

Q2. How to choose the appropriate accuracy level to balance cost and acceptance requirements?

A2. For conventional fire water tank monitoring, 0.25%FS or 0.5%FS accuracy can already meet daily operation and specification requirements; for projects sensitive to accuracy or requiring fine water volume management, the 0.1%FS version can be selected. It is recommended to make a comprehensive evaluation based on tank height, specific indicators of the acceptance unit and budget. We can provide comparative data to support selection.

Q3. What interface issues should be noted when integrating the device with existing PLC or fire alarm hosts?

A3. The standard 4-20mA two-wire output can be directly connected to the PLC analog input module. It is necessary to confirm that the host input impedance and power capacity match. It is recommended to use shielded cables and good grounding to improve anti-interference performance. If digital communication is required, customized solutions can be discussed separately.

Q4. How long can the IP68 protection maintain stability in actual tank immersion environments?

A4. The sensor adopts multi-channel waterproof technology and industrial-grade sealing structure, combined with 316L stainless steel material, and can operate stably for a long time within the medium temperature range of -20~85℃. In engineering practice, many projects have achieved years of trouble-free operation. The specific lifespan is also related to water quality cleanliness and installation/maintenance conditions.

Q5. How to set and link the high and low liquid level alarm function?

A5. The display instrument supports on-site or remote setting of alarm thresholds. When the water level reaches the preset high or low level, the relay output can directly drive sound and light alarms or link with the water pump control circuit. At the same time, the 4-20mA signal can be synchronously uploaded to the upper system to achieve remote monitoring and recording.

Q6. Are the electrical protection measures sufficient for projects in lightning-prone areas?

A6. The device is equipped with triple lightning protection design and core lightning protection motherboard, providing effective protection against surges and transient overvoltages. Combined with good on-site grounding and lightning arresters, it can significantly improve system availability in high-risk areas. It is recommended to evaluate the local lightning activity level during the scheme design stage.

Q7. In multi-water-tank parallel projects, does it support one sensor corresponding to multiple display points?

A7. Yes, it supports multi-point display of the same sensor signal through signal distribution or parallel connection of multiple display instruments. The engineering party can flexibly configure according to the control room layout and monitoring requirements, reducing hardware redundancy costs.

Q8. What technical support and delivery guarantees can Nexisense provide for bulk procurement projects?

A8. We provide system integrators and engineering companies with complete technical selection guidance, installation and debugging manuals, on-site training, and customized configuration services. The products come with a full set of certification documents and quality inspection reports. Production and delivery are arranged according to project progress to ensure synchronization with the overall fire system debugging.

Summary

The Nexisense fire water tank level display device provides a stable and reliable hardware foundation for fire water tank and water box monitoring projects with its standard 4-20mA output, IP68 protection, long-distance transmission capability and simple integration features. Whether in new construction projects or existing system upgrades, the device can help engineering teams efficiently meet specification requirements while controlling implementation costs.

Welcome system integrators, IoT solution providers and project contractors to provide specific tank parameters, transmission distances and integration interface requirements. We will quickly output selection recommendations and quotation schemes to assist the smooth progress and acceptance of the project.