Product Description
The Monitor pH/C-900 is an integrated unit designed to deliver precise, real-time monitoring of pH and conductivity across a diverse range of liquid chromatography applications. It concurrently measures pH and conductivity with temperature compensation, enhancing accuracy. This system complements UV monitoring by offering genuine elution conditions, proving invaluable for optimizing gradients, ensuring reproducibility over multiple runs, and maintaining sample, buffer, and data quality from other instruments.
Featuring a broad dynamic range from 0-14 pH units and 1 µS/cm to 999.9 mS/cm, it eliminates the need for range adjustments and is well-suited for applications spanning low conductivity reversed-phase to high salt separations. Its high-performance flow cells can accommodate flow rates up to 100 ml/min.
The Monitor pH/C-900 precisely gauges the elution conditions in chromatographic separations, whether integrated within ÄKTAdesign systems or used as a standalone instrument. It provides clear readings of pH, conductivity, and temperature, compensating for temperature fluctuations that can impact pH and conductivity. Continuous self-diagnostics ensure reliable and reproducible results. The low cell volume and high linearity of both the pH and conductivity/temperature flow cells guarantee accurate measurements.
Specifications
| Accuracy | The greater of ± 2% of full scale or ± 10 µS/cm in the range 1 µS/cm-300 mS/cm ± 0.1 pH unit, temperature compensated Max. 0.1 pH units within 0–10 ml/min (pH measurement) |
| Operating pressure max. | 50 bar (5 MPa) (725 psi) |
| Conductivity | 1 µS/cm-999.9 mS/cm |
| Operating Temperature | 4°C-40°C |
| Relative humidity | 20%-95% (non condensing) |
| Wetted Part | No |
| pH Stability Long Term | 2-12 |
| Baseline noise | ± 0.5% of full scale calibrated range |
| Drift | Max. 0.02 pH/h (measured at pH 4.0) ±0.5 °C per 10 h 0.1 pH unit deviation/10 h |
| Cell Constant | 50 ± 20 cm-1 |
| Response Time | Max. 10 s (0–95% of step) (pH measurements) Max. 3 s (0–95% of step) (Conductivity measurement) |
| Width | 260 mm |
| Depth | 370 mm |
| Height | 100 mm |
| Weight | 8.5 kg |
| Voltage | 100-120/220-240 VAC |
| Protection class | IP 20 (Housing) IP 44 (Flow cell) |
| Material | Glass Perfluororubber (FFKM) Polyetheretherketone (PEEK) Polytetrafluoroethylene (PTFE) Titanium alloy (Ti alloy) Chlorotrifluoroethylene (CTFE) |









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