Apera LabSen 241-180 Refillable Micro pH Electrode

Apera LabSen 241-180 Refillable Micro pH Electrode for NMR Tubes and Deep Containers

Product Overview

The Apera LabSen 241-180 Refillable Micro pH Electrode is a specialized laboratory pH electrode designed for accurate measurement of micro-volume samples in narrow, deep, and slim containers such as NMR tubes. Developed with Apera’s proprietary pH sensor technology and premium materials from Switzerland, the electrode combines a long, ultra-slim glass membrane with a stable refillable reference system for reliable laboratory measurements.

With a 180 mm long × 3 mm diameter cylindrical glass membrane, the LabSen 241-180 can reach deep into narrow containers while requiring a minimum sample volume of approximately 50 μL. Its low-resistance glass membrane helps achieve fast stabilization, while the long-life reference system improves reference stability and extends electrode service life.

Key Features

• Specialized micro pH electrode for NMR tubes and deep containers
• Designed for micro-volume samples with a minimum volume of approximately 50 μL
• Ultra-long 180 mm cylindrical glass membrane
• Slim 3 mm diameter for narrow sample vessels
• Low-resistance glass membrane with impedance below 450 MΩ
• Long-Life Reference System for improved stability and durability
• Refillable reference design
• Ceramic junction for reliable reference contact
• 3M KCl electrolyte
• Lead-free glass construction
• Suitable for high-temperature measurements up to 100°C (212°F)
• Standard BNC connector for broad compatibility
• 3 ft cable for convenient laboratory use
• No built-in temperature sensor

Technical Specifications

pH Measurement

• Measuring Range: 0–13 pH
• Temperature Range: 0–100°C (32–212°F)
• Minimum Sample Volume: Approximately 50 μL

Electrode Construction

• Housing Material: Lead-free glass
• Membrane Shape: Cylindrical
• Membrane Length: 180 mm
• Membrane Diameter: 3 mm
• Glass Impedance: <450 MΩ
• Junction: Ceramic
• Reference System: Long-Life, refillable
• Electrolyte: 3M KCl
• Temperature Sensor: Not included

Connection

• Connector: Standard BNC
• Cable Length: 3 ft
• Compatibility: pH meters equipped with a BNC pH electrode input

Temperature Compensation

The LabSen 241-180 does not include a built-in temperature sensor. For automatic temperature compensation (ATC), a separate temperature probe such as the Apera MP500 can be used. Alternatively, the sample temperature can be manually entered into a compatible pH meter.

Applications

• NMR tube pH measurement
• Micro-volume sample analysis
• Deep and narrow laboratory containers
• Pharmaceutical research
• Chemical research
• Biotechnology applications
• Research and development laboratories
• Specialized laboratory testing
• Samples with limited available volume

Summary

The Apera LabSen 241-180 Refillable Micro pH Electrode is engineered for specialized pH measurement where sample volume and container dimensions are limited. Its 180 mm × 3 mm cylindrical glass membrane, refillable Long-Life Reference System, low-resistance sensor, and minimum sample volume of approximately 50 μL make it particularly suitable for NMR tubes, deep containers, and other narrow laboratory vessels. The standard BNC connector provides compatibility with a wide range of professional pH meters.