Monitor pH/C-900 - Good Condition

pH/C-900: High-Reliability pH and Conductivity Monitoring

The pH/C-900 monitor from Amersham is a sophisticated in-line measurement device designed for biotechnology laboratories and liquid chromatography applications. It is specifically engineered to continuously monitor critical parameters such as pH and conductivity throughout chromatographic processes, ensuring optimal performance at every stage.

The instrument is capable of measuring conductivity across a wide range—from 1 µS/cm to 999.9 mS/cm—with outstanding accuracy enabled by precise calibration, a titanium dual-electrode cell, and an integrated temperature sensor. This sensor provides automatic thermal compensation, maintaining consistent accuracy. pH is measured using a sealed double-junction electrode, delivering reliable and reproducible results within a 0 to 14 pH range.

Its modular design allows seamless integration into ÄKTA platforms, with communication via UniNet 1 and an intuitive dual-line display. Calibration can be performed manually or via UNICORN software, using standard buffers for precise adjustment. Users can configure the conductivity scale, select the interface language (including French), and even adjust the display angle for enhanced visual comfort.

Maintenance is straightforward, with minimal intervention required. The pH/C-900 is designed with clear service guidelines: periodic cleaning, semi-annual pH electrode replacement, and well-defined regeneration procedures. The measurement cells are resistant to most common chromatography chemicals, excluding aggressive organic solvents such as hexane or pure THF.

The system includes programmable alerts (countdown timers or hourly alarms), automatic restart after power failure, and a user-friendly interface with a navigation wheel and OK/ESC buttons. With its intelligent calibration system, integrated thermal management, and robust construction, the pH/C-900 is a reliable and precise solution for continuous process monitoring.

• pH Measurement Range: 0 to 14 (specifications valid between pH 2 and 12)
• pH Accuracy: ±0.1 pH (temperature-compensated), ±0.2 to ±0.5 pH (non-compensated, depending on temperature)
• pH Response Time: < 10 seconds
• pH Drift: max. 0.02 pH/hour
• Conductivity Range: 1 µS/cm to 999.9 mS/cm
• Conductivity Accuracy: ±2% of full scale or ±10 µS/cm
• Conductivity Response Time: < 3 seconds
• Temperature Sensor Accuracy: ±2 °C
• Temperature Drift: 0.5 °C / 10 hours
• Maximum Flow Rate (cells): 100 mL/min
• Maximum Pressure: 5 MPa (conductivity cell), 0.5 MPa (pH measurement)
• System Compatibility: Stand-alone or PC-controlled (UNICORN software version ≥ 2.20)
• Display: 2 lines × 20 characters
• Dimensions: 100 × 260 × 370 mm
• Weight: 8.5 kg
• Power Supply: 100–240 V AC, 50–60 Hz
• Analog Outputs: 0–1 V and 4–20 mA