Laboratory pH meter PH-900

for water analysisbenchtopsalinity

Overview
The Benchtop Multiparameter Water Quality Meter is an analytical instrument for comprehensive laboratory and industrial water analysis. It measures pH, ORP, ion concentration (ISE), conductivity/TDS/salinity/resistivity and dissolved oxygen, and supports data export via USB.

Features
pH:

• 6.5 inches backlit LCD display; 1 to 5 point calibration with automatic recognition for USA, NIST and DIN buffers.
• Automatic electrode diagnosis displays pH slope and offset; selectable resolution 0.001/0.01/0.1 pH.
• Calibration points: 1–5; accuracy ±0.002 pH.

ORP:

• 1 point offset calibration to adjust to a known standard.
• Relative and absolute millivolt modes for reliable ORP measurements; range ±1999.9 mV; resolution 0.1/1 mV; accuracy ±0.2 mV.

Ion Concentration (ISE):

• 2 to 5 point calibration with up to 8 selectable concentration points; direct ion concentration readout.
• Selectable units: ppm, mg/L, mol/L, mmol/L; supports ionic valency selection.
• Range 0.001–19999 (depends on ISE); accuracy ±0.5% F.S. (monovalent), ±1% F.S. (divalent).

Conductivity / TDS / Salinity / Resistivity:

• 1 to 5 point calibration with automatic conductivity standard recognition; selectable cell constant K = 0.1 / 1 / 10 or custom.
• Reference temperatures 20/25°C; TDS factor adjustable (0.1–1.0); modes for pure water and seawater salinity.
• Multiple ranges up to 200 mS/cm; accuracy ±0.5% F.S.

Dissolved Oxygen (DO):

• 1 or 2 point calibration using air-saturated water or zero-oxygen solution.
• Salinity and barometric pressure compensation to reduce measurement error; range 0.00–20.00 mg/L, 0.0–200.0% saturation; resolution 0.01 mg/L.

Other Features:

• Automatic or manual temperature compensation (0–100°C); Auto-Read function locks measurement endpoint.
• Calibration-due alarm and reset to factory defaults.
• Expanded memory: store/recall up to 500 data sets; USB interface for data transfer and timed interval readings.
• Setup menu: calibration points, resolution, stability criteria, temperature unit, date/time, etc.

Accessories

• pH, conductivity and dissolved oxygen electrodes; temperature probe.
• pH buffer sachets; conductivity standard solutions; DO electrolyte solution; membrane cap; electrode holder.
• USB cable and DC5V power adapter.

Technical Parameters (table summary)
Model: PH-900
pH - Range: -2.000 ~ 20.000 pH; Resolution: 0.001, 0.01, 0.1 selectable; Accuracy: ±0.002 pH; Calibration: 1–5 points; Buffers: USA, NIST, DIN, 2 custom.
ORP (Optional) - Range: ±1999.9 mV; Resolution: 0.1, 1 mV; Accuracy: ±0.2 mV; Calibration: 1 point.
Ion (Optional) - Range: 0.001–19999 (ISE dependent); Resolution: 0.001–1; Accuracy: ±0.5% F.S. (monovalent), ±1% F.S. (divalent); Units: ppm, mg/L, mol/L, mmol/L; Calibration: 2–5 points.
Conductivity - Range: 0.1 μS/cm ~ 200 mS/cm depending on cell constant; Resolution: 0.001–1; Accuracy: ±0.5% F.S.; Calibration: 1–5 points; Calibration solutions: 10, 84, 1413 μS/cm; 12.88 mS/cm; 111.8 mS/cm; Temperature coefficient linear 0.0–10.0%/°C; Reference temperature 20/25°C; Cell constant K = 0.1, 1, 10 or custom.
TDS - Multiple ranges and resolutions; Accuracy ±1% F.S.; TDS factor 0.1–1.0 (default 0.5).
Salinity - Range: 0.00–42.00 psu, 0.00–80.00 ppt; Resolution 0.01; Accuracy ±1% F.S.
Resistivity - Range: 0.00–20.00 MΩ; Resolution 0.01; Accuracy ±1% F.S.
DO - Range: 0.00–20.00 mg/L, 0.0–200.0% sat; Resolution: 0.01 mg/L; Accuracy: ±0.2 mg/L, ±2.0%; Calibration: 1 or 2 points; Barometric correction: 60.0–112.5 kPa manual; Salinity correction: 0.0–50.0 g/L manual.
Other - Temperature compensation 0–100°C (manual/auto); Memory: 500 data sets; USB interface; Power: DC5V adapter; Dimension: 210 × 188 × 60 mm; Net weight: 1.5 kg; Packing size: 300 × 250 × 200 mm; Gross weight: 1.7 kg.

Characteristics / Technical Specifications

• Model: PH-900
• Brand: BIOBASE
• pH range: -2.000 ~ 20.000 pH; Accuracy ±0.002 pH
• ORP range: ±1999.9 mV; Accuracy ±0.2 mV
• Ion concentration (ISE): Units ppm/mg/L/mol/L/mmol/L; Accuracy ±0.5%FS / ±1%FS
• Conductivity: 0.1 μS/cm – 200 mS/cm depending on cell constant; Accuracy ±0.5%FS
• TDS/Salinity/Resistivity: Multiple ranges; Typical accuracy ±1%FS
• Dissolved Oxygen: 0.00–20.00 mg/L; Resolution 0.01 mg/L; Accuracy ±0.2 mg/L
• Memory & Communication: 500 data sets; USB interface
• Power: DC5V adapter; Dimensions: 210 × 188 × 60 mm; Net weight: 1.5 kg