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Ag/AgCl Electrode
VAR-2739 Ag/AgCl electrodes are sintered silver/silver chloride pellets designed for use as bath reference electrodes in electrophysiology, patch clamp, and similar life science applications. Available in seven size variants (EP05–EP12), these low-resistance, high-strength pellets maintain a stable and well-balanced potential in the presence of current. Compatible with standard chloride-based electrolytes such as KCl, NaCl, and CaCl₂, they are a cost-effective and easy-to-use solution for building custom reference half-cells.
Ag/AgCl Reference Electrode Pellets
WPI's VAR-2739 Ag/AgCl electrodes feature improved sintered pellets with lower resistance and high strength. They are stable and well-balanced in the presence of current, making them ideal as bath electrodes or reference half-cells in electrophysiology setups.
Each pellet maintains a stable potential when incorporated into electrode holders filled with chloride-based electrolytes (KCl, NaCl, CaCl₂). Available in seven size options ranging from 0.5 mm to 12 mm in diameter, they suit a wide range of experimental configurations.
Key Features
- Sintered Ag/AgCl construction for high stability and durability
- Lower resistance and high mechanical strength vs standard pellets
- Stable reference potential with minimal drift under current
- Compatible with KCl, NaCl, and CaCl₂ electrolytes
- Seven size variants (EP05–EP12) to match any electrode holder
- Small, inexpensive, and easy to incorporate into custom setups
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Size Variants
| Model | Dimensions (diameter × length) |
|---|---|
| EP05 | 0.5 × 20 mm |
| EP08 | 0.8 × 20 mm |
| EP1 | 1.0 × 3 mm |
| EP2 | 2 × 4 mm |
| EP4 | 4 × 1 mm |
| EP8 | 8 × 1 mm |
| EP12 | 12 × 1 mm |
Technical Properties
| Property | Value |
|---|---|
| Material | Silver / Silver Chloride (sintered) |
| Compatible Electrolytes | KCl, NaCl, CaCl₂ |
| Construction | Sintered pellet |
| Application | Bath electrode / reference half-cell |
Electro-Physiology
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Ag/AgCl sintered pellet electrodes are among the most widely used reference electrodes in electrophysiology. They appear across thousands of in vitro and in vivo studies involving patch clamp recordings, field potential measurements, extracellular multi-unit recordings, and electrochemical biosensing. Their low junction potential and high stability make them a standard component in virtually every electrophysiology rig.
What are Ag/AgCl electrodes used for?
VAR-2739 Ag/AgCl pellets are used as reference or bath ground electrodes in electrophysiology experiments, including patch clamp, voltage clamp, and current clamp recordings. They provide a stable, low-impedance reference potential for grounding the experimental setup.
Which electrolytes are compatible with VAR-2739 electrodes?
VAR-2739 electrodes are compatible with standard chloride-based electrolytes including KCl, NaCl, and CaCl₂. Filling microelectrode holders with any of these electrolytes ensures a stable, well-balanced reference potential throughout your recording session.
What do the model numbers (EP05, EP08, etc.) mean?
The model numbers indicate the electrode pellet dimensions. For example, EP05 is 0.5 mm × 20 mm and EP12 is 12 mm × 1 mm. The number corresponds to the pellet diameter, and each size has a specific wire length suited to different electrode holders or recording chambers.
Do VAR-2739 electrodes need to be chlorided before use?
No. WPI's Ag/AgCl pellets are manufactured using a sintering process that incorporates the silver chloride directly into the pellet. They are ready to use as supplied and do not require any additional electrochemical chloriding step.
What makes WPI's sintered Ag/AgCl pellets different?
WPI's improved sintered construction delivers lower electrical resistance and higher mechanical strength compared to standard Ag/AgCl pellets. This results in more stable, reproducible reference potentials and longer working life, even under continuous current-passing conditions.
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