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Dri-Ref Reference electrodes

Low electrolyte leakage, stable potential with low resistance

Features

• Extremely low electrolyte leakage
• Stable, reproducible potential with low resistance
• Chemically resistant to strong acids and bases

Benefits

• May be used with ion selective electrodes without contamination from the reference electrode

Applications

• Small volume, low salt concentration measurement (SDR)

Dri-Ref™ Electrodes

Dri-Ref reference electrodes were developed by WPI to have extremely low electrolyte leakage properties, hence the name “Dri-Ref.” In addition to this key feature, these electrodes exhibit stable and reproducible potential and low resistance. Stored in KCl when not in use, they have a long life expectancy. Low leakage is achieved by using KONBO™, a product combining modern ceramic and conductive polymer technology, as the liquid junction. Electrode resistance is low, an important consideration when making low-noise measurements.

Although the internal filling solution contains KCI, the low fluid leakage means Dri-Ref may be used in combination with ion selective electrodes, including those for K⁺ and Cl^-, without significant contamination from the reference electrode.

The Dri-Ref electrodes are chemically resistant to strong acids and alkalines. Dri-Ref electrodes are not suitable for use in organic solvents. In addition, the long, thin FLEXREF may be easily manipulated to accommodate a difficult experimental setup.

SUPER-Dri-Ref

With a diameter of 2-mm, SUPER-Dri-Ref does not leak electrolyte at all. Exhibiting the electrical stability of a classic flowing junction reference cell, this electrode exhibits low resistance and a stable half-cell potential essentially independent of sample electrolyte concentration. SUPER-Dri-Ref is ideal for small volume and low salt concentration measurements.

Micro-Reference Electrode

Only 450µm in diameter and 1inch long, WPI’s new DRIREF-450 reference electrode can be used along with other sensors in space-restricted areas and very small sample volumes.

Luer-Tip Reference

The male luer fitting at the front of the DRIREF-L allows it to be easily connected to a female luer port (see WPI’s luer fittings) to form a tight seal — a very convenient installation for a flow-through system.

Comparison Chart of DriRef Specifications

Electrode	Length	Diameter	Construction	Lead Length	Connector	Resistance (typical)	Filling Solution	Electrolyte Leakage (mL/hr)
DRIREF-450	2.54cm	450µm	Coated Glass	30 in. (76cm)	2mm pin	< 5KΩ	KCl	—
DRIREF-5	9cm	4.7mm	Epoxy	30 in. (76cm)	2mm pin	~500Ω	KCl	> ~7.4×10-7
DRIREF-2	13cm	2mm	Isoplast™	30 in. (76cm)	2mm pin	~2.7KΩ	KCl	~5.7×10-8
FLEXREF	13cm	1.5 mm	Teflon™	30 in. (76cm)	2mm pin	~2.7KΩ	KCl	~5.7×10-8
SDR2	9cm	2 mm	PVC	30 in. (76cm)	2mm pin	< 5KΩ	KCl	—
DRIREF-L	7.5cm	Standard Luer	Polypropylene	30 in. (76cm)	2mm pin	~500Ω	KCl	~7.4×10-7
DRIREF-5SH	3.5cm	4.7mm	Epoxy	30 in. (76cm)	2mm pin	~500Ω	KCl	~7.4×10-7
DRIREF-2SH	2cm	2 mm	Isoplast™	30 in. (76cm)	2mm pin	~2.7KΩ	KCl	~5.7×10-8

 

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