Reference Electrodes

These compact, glass-bodied reference electrodes from BASi are available in two styles. The 7.5 cm long RE-5B reference electrode is used for electrochemistry experiments and is compatible with the C-3 Cell Stand, the CGME Controlled Growth Mercury Electrode Cell Stand, and the RDE-2 Rotating Disk Electrode Cell Stand. The RE-6 and RE-4 reference electrodes (3 cm) are designed for use with BASi Electrochemical Flow Cells. All electrodes have a 6 mm OD glass body, and use a porous junction (frit) made from a ceramic material (for the RE-6 and RE-4) or CoralPor™ (for the RE-5B, part number MF-2064). (Please note that due to the high resistance of the ceramic frit, the RE-6 and RE-4 electrodes are only recommended for aqueous electrolytes.)

Connection to the cell lead is via a gold-plated pin on the end of a flexible plastic-coated wire (for the RE-5B and RE-6). An O-ring is included with each electrode. Between uses, reference electrodes should be stored with junction tips in a MR-5275 vial filled with the appropriate storage solution (CF-3000 or CF-3001).

The MF-2030 double junction reference electrode can be set up using an RE-5B reference electrode with the glass chamber . This chamber also has a CoralPor™ frit, which must be maintained.

Silver/Silver Chloride (Ag/AgCl) Reference Electrodes


Part Number
RE-5B Ag/AgCl (3M NaCl) Reference Electrode with Flexible Connector
RE-5B Ag/AgCl (3M KCl) Reference Electrode with Flexible Connector
RE-6 Reference Electrode with Flexible Connector for Electrocemical Flow Cell
RE-4 Ag/AgCl Reference Electrode for Electrochemical Flow Cell

Other Aqueous Reference Electrodes

Part Number
Calomel Reference Electrode
Chloride Free Reference Electrode
Alkaline Reference Electrode                                                                                  
Copper/Copper Sulfate Reference Electrode 
Non-Aqueous Silver/Silver Ion (Ag/Ag+) Reference Electrode Kit
Part Number Description
MF-2062 Non-Aqueous Reference Electrode Kit***                                                               

***This kit contains the parts required for construction of a non-aqueous silver/silver ion reference electrode. The glass electrode body has a porous CoralPor™ tip attached with heat shrink tubing. The removable Teflon top contains a silver wire and 0.060 " gold-plated connecting pin for the cell lead. The kit also contains solid silver nitrate, extra heat shrink tubing, and extra porous CoralPor™ tips. Non-aqueous solvents must be supplied by the user. An instruction sheet illustrates easy assembly.

Silver/Silver Chloride (Ag/AgCl) Reference Electrode Parts and Accessories

Part Number Description
MF-2030  Double-Junction Reference Electrode Chamber                                                  
MF-2064 Porous CoralPor™ Tips, 1/8" long (5/pkg) with 1/2" lengths of Teflon heat shrink (6/pkg)
MF-2042 Glass Tube with Porous CoralPor™ Tip
MF-2017 Silver Wire, 0.5 mm dia., 12" (30 cm) long- 99.9% purity 
MF-2027 Teflon Heat Shrink Tubing, ~4 mm OD x 30 cm
MF-2044 O-ring, 1/4", 12/pkg. 
MR-3608 PEEK Reference Electrode Retainer
MF-2022 RE-4 Bushing, 10/pkg.
MF-2023 O-Ring for Non-aqueous solvent, RE-4 and RE-6
MR-1245 O-Ring for Non-aqueous solvent, RE-4

Non-Aqueous Reference Electrode Parts and Accessories

Part Number Description
MF-2030  Double-Junction Reference Electrode Chamber                                                  
MW-1085 Non-aqueous Reference Electrode: Glass tube with CoralPor™ Tip and Cap with Silver Wire
MF-2042 Glass Tube Porous CoralPor™ Tip, 6 mm OD 7.5 cm long
MF-2064 Porous CoralPor™ Tip, 1/8" long (5/pkg) wtih 1/2" lengths of Teflon heat shrink (6/pkg)
CF-1060 Silver Nitrate 1 g

Reference Electrode Storage and Solution Refill

Part Number Description
MR-5275 Storage vial for Ag/AgCl reference electrodes (Aqueous only)                                                  
CF-3000 3M Sodium Chloride Storage/Refill Solution 
CF-3001 3M Potassium Chloride Storage/Refill Solution
CF-3002 Saturated Copper Sulfate Storage/Refill Solution

Frequently Asked Questions

What properties are required for a reference electrode?

What are the differences between the silver/silver chloride reference electrode and the saturated calomel reference electrode?

What are liquid junction potentials, and how do they affect measured potentials?

What factors can affect the potential of a reference electrode?

How do I store reference electrodes?

Can I use aqueous reference electrodes for non-aqueous solutions?

I need to use anhydrous electrolyte, so an aqueous reference electrode is not suitable. What are the alternatives?

"Practical Problems in Voltammetry 3: Reference Electrodes for Voltammetry", A.W. Bott, Current Separations, 14 (1995) 64.