PH8001 Digital pH Sensor, pH Probe with Plastic Body for Liquids PH Value Measuring/Monitoring
Introduction
The PH8001 plastic pH sensor provides dependable pH and ORP measurement in water quality analysis applications, utilizing digital RS485 Modbus RTU output for reliable signal transmission over extended distances with minimal interference, supported by an isolated power supply.
It automatically defaults to manual temperature compensation at 25°C if the integrated sensor fails, ensuring continued operation. Calibration is efficient, compatible with USA, NIST, or user-defined buffers, and can be performed remotely through RS-485 commands for convenient adjustments.
The composite electrode performs well in clean to moderately contaminated water, with a recommended replacement interval of one year or when the slope falls below 70%.
Maintenance involves gentle cleaning of the glass bulb with water or a soft swab, and proper storage in a moist environment to prevent dehydration. Installation is straightforward in tanks or pipes via 3/4 NPT threads, with support for device addresses from 1 to 255 and standard baud rates such as 9600 for easy system integration.
Working principle
Step 1: Sensing Changes
The composite electrode picks up voltage shifts from hydrogen ions (pH) or redox reactions (ORP) in the water, using a glass tip and reference to create a raw signal.
Step 2: Processing and Fixing
Built-in circuits amplify the signal, apply temp corrections (auto or manual at 25°C default), and convert it to digital values with options like USA or NIST standards.
Step 3: Sending Data
The RS-485 interface packages the info via Modbus RTU protocol, letting you read or set registers for pH, ORP, temp, and calibration over distances with low noise.
Key Features
This pH sensor keeps things straightforward for reliable use:
- Digital Output — RS485 Modbus RTU for easy remote access and commands like reading registers or calibration.
- Temperature Compensation — Auto or manual fixes, with auto-switching if the probe fails, covering 0-60°C.
- Flexible Calibration — Supports USA (4/7/10 pH), NIST (4/6.86/9.18 pH), or custom buffers; stores zero, slope, and points.
- Anti-Interference — Isolated power and low-noise cable for stable signals, even over long runs.
- Easy Setup — 3/4 NPT threads for direct pipe or tank mount; compact with 5m cable (custom lengths available).
- Low Power — Just 30mA at 12V, with 6-30V DC range and overload protection.
- Status Checks — Registers display system health, including temperature faults and calibration state.
Specification
| Product | Digital pH sensor |
| Model | SUP-PH8001 |
| Measurement range | 0.00-14.00pH; ±1000.0mV |
| Resolution | 0.01pH,0.1mV |
| Heat resistance | 0 ~ 60℃ |
| Output | RS485 (MODBUS-RTU) |
| ID | 9600，8，1， N (Standard) 1-255 |
| Power supply | 12VDC |
| Power consumption | 30mA @12VDC |
Applications
The PH8001 plastic pH sensor is well-suited for scenarios where consistent water pH and ORP monitoring is essential for quality control and system health:
- Aquaculture — Continuously checks pH levels in fish tanks or ponds to maintain optimal conditions that promote healthy growth and prevent stress or disease in aquatic life.
- IoT water quality — Integrates into smart networks to track pH and ORP in streams, pools, or reservoirs, enabling real-time alerts and data sharing for environmental or recreational management.
- Industrial testing — Measures pH in lightly contaminated process fluids or laboratory samples, supporting quality assurance in manufacturing or research settings with reliable digital outputs.
- Data collection — Captures ongoing pH, ORP, and temperature readings for remote applications or logging systems, facilitating analysis in monitoring stations or automated reports.
