pHG-3081 Online pH Meter
**Model NO.:** PHG-3081
**Trademark:** BOQU
**Origin:** Shanghai, China
**HS Code:** 90278099
The **PHG-3081 Industrial pH Meter** is a state-of-the-art microprocessor-based instrument designed for continuous and accurate online monitoring of pH levels. Featuring an English display, menu-driven operation, and advanced functionality, this meter offers high intelligence, multi-function capabilities, and excellent environmental adaptability. It integrates the sensor and transmitter into one unit, making it ideal for a wide range of industrial applications such as thermal power plants, chemical fertilizers, metallurgy, environmental protection, pharmaceuticals, biochemistry, food processing, and water treatment systems.
**Key Features:**
- **Modern Design:** Sleek aluminum casing with a metallic texture for durability and aesthetics.
- **Intelligent Technology:** Utilizes high-precision AD conversion and single-chip microcomputer technology to measure pH, temperature, and automatically compensate for temperature variations.
- **High Reliability:** All components are mounted on a single circuit board, eliminating complex switches and potentiometers.
- **Dual High-Impedance Input:** Offers input impedance up to 10¹² Ω, ensuring strong resistance to interference.
- **Solution Grounding:** Effectively eliminates disturbances from ground loops.
- **Isolated Current Output:** Uses optoelectronic isolation for long-distance transmission and improved immunity to interference.
- **Communication Interface:** Supports RS485 or RS232 connectivity for easy integration with computers and control systems.
- **Automatic Temperature Compensation:** Works efficiently within a temperature range of 0–99.9°C.
- **IP54 Protection Rating:** Waterproof and dustproof design suitable for outdoor use.
- **User-Friendly Interface:** Menu-driven operation similar to computer navigation, allowing intuitive control without the need for a manual.
- **Multi-Parameter Display:** Simultaneously shows pH value, mV reading (or current output), temperature, time, and system status.
**Technical Specifications:**
1. **Measuring Range:**
- pH: 0–14.00 pH, resolution: 0.01 pH
- Electric Potential: ±1999.9 mV, resolution: 0.1 mV
- Temperature: 0–99.9°C, resolution: 0.1°C
2. **Temperature Compensation Range:** 0–99.9°C (with 25°C as reference; optional up to 150°C)
3. **Water Sample Testing Conditions:** 0–99.9°C, 0.6 MPa
4. **Automatic Temperature Compensation Error:** ±0.03 pH
5. **Repeatability Error:** ±0.02 pH
6. **Stability:** ±0.02 pH/24h
7. **Input Impedance:** ≥1×10¹² Ω
8. **Clock Accuracy:** ±1 minute/month
9. **Isolated Current Output:** 0–10 mA (load <1.5 kΩ), 4–20 mA (load <750 Ω)
10. **Output Current Error:** ≤±1% FS
11. **Data Storage Capacity:** 1 month (1 point every 5 minutes)
12. **Alarm Relays:** AC 220V, 3A
13. **Communication Interface:** RS485 or RS232 (optional)
14. **Power Supply:** AC 220V±22V, 50Hz±1Hz; optional 24VDC
15. **Protection Grade:** IP54, aluminum housing for outdoor use
16. **Dimensions:** 146 (L) × 146 (W) × 150 (D) mm; hole size: 138 × 138 mm
17. **Weight:** 1.5 kg
18. **Operating Conditions:** Ambient temperature: 0–60°C, relative humidity <85%
19. **Electrode Options:** Can be equipped with 3-in-1 or 2-in-1 electrodes for various installation requirements.
The **PHG-3081 pH Meter** is a reliable and versatile solution for real-time pH monitoring in demanding industrial environments. Its advanced features, user-friendly interface, and robust construction make it an essential tool for maintaining process efficiency and quality control.
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