Product
NBL-WQ-PH-4
NiuBoL NBL-WQ-PH-4 online pH sensor adopts glass electrode method with a patented reference system that lasts more than 20 months. It supports RS-485 Modbus/RTU protocol and is easy to integrate into PLC, DCS and IoT systems. It is suitable for online pH monitoring in industrial water treatment, wastewater treatment and chemical processes.
Description
NBL-WQ-PH-4 Online pH Sensor: Long-Life, High-Stability Industrial-grade pH Online Monitoring Solution In wastewater treatment, chemical production, environmental water quality monitoring and acid-base neutralization processes, pH fluctuations often lead to process loss of control, equipment corrosion or excessive discharge. Traditional pH electrodes have fast reference liquid seepage, short lifespan and are easily interfered with, resulting in high maintenance costs. The NiuBoL NBL-WQ-PH-4 online pH sensor adopts the glass electrode method and is equipped with a patented microporous salt bridge reference system. The reference liquid seeps out extremely slowly under at least 100KPa pressure, lasting more than 20 months, effectively extending electrode life. The dual high-impedance differential amplifier design gives the sensor strong anti-interference capability and fast response speed. The sensor is easy to install and maintain, and is particularly suitable for system integrators and engineering contractors to build reliable online water quality monitoring systems, effectively solving the industry pain points of short lifespan, large drift and complex integration in traditional pH sensors. Core Advantages Ultra-Long Life and High Stability: The patented reference system allows reference liquid seepage to last more than 20 months, doubling electrode life with small drift, suitable for long-term online operation. Strong Anti-Interference and Fast Response: Dual high-impedance differential amplifier design provides strong anti-interference capability, response time T90＜30s and high measurement accuracy. Easy Integration and Reliable Protection: Natively supports RS-485 Modbus/RTU protocol, optional 4-20 mA output, IP68 protection rating, 3/4NPT installation interface, suitable for various industrial environments. NBL-WQ-PH-4 Online pH Sensor Product Overview The NiuBoL NBL-WQ-PH-4 online pH sensor is a digital sensor developed for continuous online monitoring of pH value in industrial sites, designed based on the glass electrode method principle. The sensor has a built-in high-precision Pt1000 temperature sensor that realizes automatic temperature compensation, ensuring accurate and reliable measurement results under different temperature conditions. The sensor provides two housing material options: POM+ABS engineering plastic (NBL-WQ-PH-4-A) and POM+316L stainless steel (NBL-WQ-PH-4-S), which can meet the needs of different corrosive media. The standardized RS-485 Modbus/RTU protocol allows direct connection to third-party devices such as PLC, DCS, industrial control computers, paperless recorders or touch screens, greatly simplifying system integration work. For system integrators, it provides a stable and reliable data interface; for engineering contractors, it reduces on-site wiring difficulty and long-term maintenance costs, ensuring the monitoring system operates stably under complex working conditions. The product has undergone 72-hour aging testing and strict quality inspection, and has high reliability upon leaving the factory. NBL-WQ-PH-4 Online pH Sensor Key Technical Advantages 1. Patented Reference System and Long-Life Design The patented pH electrode is adopted, and the internal reference liquid seeps out extremely slowly through the microporous salt bridge under at least 100KPa (1Bar) pressure, with positive seepage time exceeding 20 months. This stable reference system significantly extends electrode service life, reduces costs and downtime caused by frequent replacement, and maintains measurement stability. 2. High Anti-Interference Measurement Circuit Built-in dual high-impedance differential amplifier effectively suppresses electromagnetic interference and signal noise, with fast response speed and reliable measurement data. Even in strong electromagnetic environments or complex industrial sites, the sensor can still output stable and accurate pH values. 3. Rugged and Durable Hardware Configuration - Two housing materials are available: POM+ABS (lightweight and corrosion-resistant) or POM+316L stainless steel (higher corrosion resistance), adapting to different media. - Protection rating IP68, supports long-term submerged installation. - Installation interface is 3/4NPT pipe thread, convenient for submerged, pipeline or tank installation. - Standard 5-meter 5-core twisted shielded cable, supports customized length with strong anti-interference capability. 4. Intelligent Communication and Low Power Consumption Integration Supports RS-485 Modbus/RTU protocol, with stable and reliable communication, easy to seamlessly integrate with various host computer systems. Optional 4-20 mA analog output meets the needs of different control systems. Power consumption is only 0.2W@12V, and the low-energy design is suitable for distributed monitoring stations. 5. Convenient Calibration and Maintenance Uses two-point calibration method (zero point + slope), completed with standard buffer solutions (pH 6.86, 4.00, 9.18). Daily maintenance only requires cleaning with distilled water and soaking in electrode storage solution. Glass membrane dirt can be cleaned with dilute hydrochloric acid. The sensor is calibrated at the factory and random calibration is not recommended unless necessary. These technical advantages enable the NBL-WQ-PH-4 to perform excellently in long-term operation and significantly reduce operation and maintenance costs of engineering projects.
ManufacturerNiubol
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Frequently Asked Questions
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- Start by defining your use case, required sensor types, and coverage area. Verify that your chosen devices support the LoRaWAN class (A, B, or C) that fits your application — Class A for battery-powered sensors, Class C for always-on actuators. Make sure you have gateway coverage in your area — use a LoRaWAN field tester to verify signal strength and connectivity before deploying your devices. All devices in our catalogue are pre-certified for seamless integration with the Sensor-Online platform, which handles device provisioning, data routing, and visualization out of the box.
- How do I succeed with my wM-Bus project?
- wM-Bus (Wireless M-Bus) is the standard protocol for utility metering — water, heat, gas, and electricity. Key steps: select a compatible wM-Bus gateway or receiver, verify the transmission mode (T1, C1, or S1) supported by your meters, and confirm that your software can parse the meter telegrams. Our catalogue includes certified wM-Bus devices and gateways that integrate directly with the Sensor-Online platform, giving you a complete path from meter to dashboard.
- Does the product work with the Sensor-Online platform?
- Yes. All products in our catalogue are certified and tested with the Sensor-Online IoT platform. They support MQTT and REST API for straightforward integration, and configuration is done directly in the platform's web interface — no external software required. The devices also support Node-RED and n8n for advanced automation logic.
- Can I integrate the product with my existing system?
- Most of our products communicate via standard protocols such as MQTT, Modbus, HTTP/REST, or LoRaWAN, enabling integration with most SCADA, BMS, and ERP systems. We also offer custom integrations via our API. Contact us if you have a specific system you need to connect.
- Do I need programming skills to set up the device?
- No. Basic installation and configuration is done through the Sensor-Online web portal without any coding. For advanced automation flows using Node-RED or n8n, some technical understanding is helpful — but we provide ready-made flow templates and guides for the most common scenarios.
