The Apera PH850-HF (AI5529) is a professional handheld pH meter designed for strong acidic and hydrofluoric acid (HF)-containing solutions. It features the Swiss-engineered LabSen 833 electrode with a specialized HF-resistant glass membrane and Silver Ion Trap reference system to reduce corrosion and junction clogging. Its foldable stand supports benchtop testing, while IP57 protection makes it suitable for field use.
• Brand: Apera Instruments
• Model / SKU: PH850-HF / AI5529
• pH Range / Accuracy: 0–14 pH / ±0.01 pH
• Included Electrode: Swiss LabSen 833 pH/temperature electrode
• Electrode Features: HF-resistant glass membrane, Silver Ion Trap, and blue gel electrolyte
• HF Service Life: Approximately 1,000 measurements at ≤0.1 mol/L (0.2% by weight), with less than 1 minute per measurement
• Temperature Range / Accuracy: 0–100°C / ±0.5°C
• Calibration: Automatic 1–3-point calibration; recognizes five standard buffers
• Protection Rating: IP57 — waterproof and dustproof
• Power Supply: Standard AA batteries
• Additional Features: Foldable stand, electrode self-diagnostics, and slope display
• Certifications / Warranty: CE and RoHS; 3 years for meter and 6 months for electrode
Key Advantage: Its specialized HF-resistant electrode supports strong-acid measurements where conventional pH probes can deteriorate quickly. The foldable stand, replaceable electrode, and rugged housing make it practical for both laboratory and field testing. HF concentration and measurement-time limits must be strictly observed.