This online chloride ion sensor adopts solid-state membrane ion selective electrode technology, specially developed for continuous online monitoring of free chloride ions in water bodies. The product provides two output modes, RS-485 (Modbus/RTU) and 4-20mA, which users can flexibly choose according to the on-site control system. It can be connected to the analog module of PLC/DCS or digitally communicate with the upper computer through bus mode, fully meeting different integration requirements. The sensor is equipped with Pt1000 automatic temperature compensation, which effectively eliminates the influence of temperature changes on chloride ion activity, ensuring stable and accurate measurement data within the working range of 0-50 ℃. The whole machine supports a wide voltage power supply of 12-24V DC, with a power consumption of only 0.2W and an IP68 protection level. It can be immersed in pipelines, pools, or natural water bodies for a long time.
Core Features:
| Model | ZW-CL-PR-A | ZW-CL-PR-S |
| Case material | POM and ABS | POM and 316L |
| Measuring principle | Ion selection method | |
| Range and resolution | 0~3500.0 mg/L | 0.1mg/L,0.1℃ |
| 0~35000 mg/L | 1mg/L,0.1℃ | |
| Accuracy | ±5% of reading; ±0.3℃ | |
| Response time (T90) | <60s | |
| Minimum detection limit | 0.1(0-3500 mg/L) | |
| 1(0-35000 mg/L) | ||
| Calibration method | Two-point calibration | |
| Cleaning method | / | |
| Temperature compensation | Automatic temperature compensation (Pt1000) | |
| Output method | RS-485(Modbus RTU), 4-20 mA (optional) | |
| Storage temperature | -5~65℃ | |
| Working conditions | 0~50℃, ≤0.2MPa, pH: 2~12 | |
| Installation method | Submersible installation, 3/4 NPT | |
| Power consumption | 0.2W@12V | |
| Power supply | 12~24V DC | |
| Protection level | IP68 | |
| Cable length | 5 meters, other lengths can be customized | |




Industrial-Grade & Stable Data Transmission: RS485 delivers robust anti-interference performance for real-time, reliable hardness data transmission in harsh environments (e.g., industrial boilers, municipal water supply), ensuring accurate monitoring.
Easy Integration & Scalability:Supports multi-node networking, seamlessly integrates with mainstream PLC/RTU systems, enabling flexible deployment and reducing system integration costs and maintenance complexity.

1.Are you manufacture?
A:Yes,we are Tranmitter manufacturer and exporter in China with more than 10 years of CE,ROHS,FCC,ISO and 11 patents experience.
2.Do you offer OEM services?
A:Yes,we can provide you with OEM services and design housings and logos.
3.DO you offer free samples?
A:Sorry,we don't offer free samples.After ordering in bulk,we will deduct the sample fee from the second order.
Strong R & D: 30+ Senior experts and highly educated personnel formed a R & D team, heavy investment, master a number of core technologies and patents.
Professional and effective solutions: for smart environmental protection, agriculture and other fields, to provide customized compound networking solutions.
Full range of products: covering the whole industry chain products from data collection to platform services to meet diverse needs.
Excellent quality: we have perfect quality control system, strictly quality control each production link, low defective rate.
Good service: 7×24 hours fast response, Professional pre-sale, sale, after-sales team support.