Apera LabSen 831 Refillable pH Electrode for HF Acid and Strong Acidic Solutions

Product Overview

The Apera LabSen 831 Refillable pH Electrode is a professional-grade pH electrode specifically designed for accurate measurement of solutions containing hydrofluoric acid (HF) and other strong acidic samples. Featuring Apera’s proprietary Swiss sensor technology and premium materials, this electrode combines excellent chemical resistance, measurement stability, and mechanical durability.

The specialized LabSen HF glass membrane is resistant to hydrofluoric acid corrosion and is suitable for repeated measurements in HF-containing solutions under specified conditions. Its hemispherical glass membrane is also designed to withstand accidental impact better than conventional glass membranes.

The electrode uses a Silver Ion Trap Reference System to help prevent junction clogging and extend measurement reliability. A blue gel electrolyte further minimizes the possibility of air bubbles inside the reference system.

Key Features

• Designed specifically for HF (Hydrofluoric) acid-containing solutions and strong acidic solutions.
• Proprietary LabSen pH sensor technology developed with premium materials from Switzerland.
• LabSen HF glass membrane provides accurate measurement in strong acid samples.
• Resistant to hydrofluoric acid corrosion.
• Suitable for up to approximately 1,000 measurements under specified HF conditions.
• Recommended HF measurement conditions:
  • Measurement time: less than 1 minute per measurement.
  • HF concentration: less than 0.1 mol/L or 2,000 ppm.
• Rugged hemispherical glass membrane is approximately 10 times stronger than traditional glass membranes.
• Silver Ion Trap Reference System helps prevent silver-ion contamination and junction clogging.
• Blue gel electrolyte reduces the possibility of air bubbles inside the sensor.
• Refillable reference system using 3M KCl electrolyte.
• Ceramic junction for reliable electrolyte contact.
• BNC connector for broad compatibility with pH meters equipped with a BNC input.
• No built-in temperature sensor.
• Temperature compensation can be performed using a separate temperature probe or by manually entering the sample temperature.

Technical Specifications

pH Measurement

• pH Range: 0–12 pH
• Application: HF-containing solutions and strong acidic solutions
• Membrane Type: LabSen HF glass
• Membrane Shape: Hemispherical
• Membrane Impedance: <400 MΩ

Temperature

• Temperature Range: 0–100°C (32–212°F)
• Temperature Sensor: No built-in sensor
• Temperature Compensation: Manual temperature input or external temperature probe required for ATC

Reference System

• Reference Type: Silver Ion Trap
• Reference System: Long-Life Reference with Silver Ion Trap
• Electrolyte: 3M KCl
• Junction: Ceramic
• Electrolyte Type: Blue gel

Physical Specifications

• Housing Material: Lead-free glass
• Length: 120 mm
• Diameter: 12 mm
• Membrane Shape: Hemispherical
• Connector: BNC
• Cable Length: 3 ft

HF Measurement Capability

The LabSen 831 is specially engineered for measurements involving hydrofluoric acid. Its HF-resistant glass membrane provides reliable pH measurement while reducing corrosion-related deterioration of the sensing element.

For extended electrode life, measurements should follow the specified conditions:

• HF concentration below 0.1 mol/L or 2,000 ppm.
• Measurement duration less than 1 minute per measurement.
• Under these conditions, the electrode is rated for approximately 1,000 measurements.

Temperature Compensation

The LabSen 831 does not include a built-in temperature sensor. For automatic temperature compensation (ATC), an external temperature probe such as the Apera MP500 can be used. Alternatively, the sample temperature can be measured separately and manually entered into a compatible pH meter.

Compatibility

• Compatible with pH meters equipped with a standard BNC pH electrode connector.
• Suitable for laboratory pH meters, benchtop pH meters, and portable pH meters with BNC input.
• An external temperature probe is required when ATC is needed.

Applications

• Hydrofluoric acid-containing solutions
• Strong acidic solutions
• Chemical laboratories
• Industrial chemical processing
• Research and development
• Laboratory quality control
• Chemical analysis
• Acidic sample testing

Summary

The Apera LabSen 831 Refillable pH Electrode is a specialized solution for professional pH measurement in HF-containing and strongly acidic samples. Its HF-resistant LabSen glass membrane, reinforced hemispherical design, Silver Ion Trap Reference System, refillable 3M KCl electrolyte, and BNC connector make it a durable and reliable choice for demanding laboratory and industrial applications.