Laboratory Electrochemical Electrodes

Laboratory Electrochemical Electrodes

Glass Membrane 

Glass membrane is the most important part of pH electrode.

● LabSen pH electrodes are equipped with 4 types of glass membrane to meet various

applications: S membrane, H membrane, HF membrane and PHY membrane.

For example HF membrane is used for HF resistance electrode.

● LabSen glass membrane has good impact resistance. It will not be damaged by general

intensity impact, completely differentiating from conventional glass membranes.

● LabSen glass membrane with different shapes are shown as below:

1669272844048.jpg

Junction

Junction is the electrolyte interface between reference system and the solution to be

measured, LabSen electrode adopts the following types of junctions:

● Ceramic -- the most frequently used junction, easy to be blocked by protein-containing

or suspension solution.

● Pore without diaphragm -- it is used with solid electrolyte, no clogging, maintenance-free.

● Movable sleeve -- easy to clean, suitable for suspension, emulsion, low ion concentration

solution and nonaqueous solution. The infiltration rate of electrolyte is determined by the

tightness of the sleeve during installation.

● PTFE -- a kind of Teflon material with multi pores, hard to be contaminated.

Inner Solution

The inner solution of LabSen electrode is in a unique dark blue. With a special gel

treatment, the inner solution does not flow and will not cause air bubbles. The electrode can

work well even when being upside down.

Reference System

Besides routine Ag/AgCl reference electrode, LabSen pH electrodes are more likely to

adopt Long-life reference electrode and Silver-ion-trap reference electrode. 

1669272877366.jpg

Long-life reference system is composed of a glass tube, AgCl and reference silver wire.

The top end of the slim glass tube is stuffed with cotton, which will prevent reaction between

AgCl and electrolyte when temperature changes, improving the stability of reference

electrode and service life.

1669272901254.jpg

Based on the Long-life reference system, a Silver-ion-trap is added to prevent the contamination of the junction when testing

samples contains sulfides and proteins, significantly increasing the stability of the reference electrode.

Electrolyte

In addition to the conventional 3M KCl solution and gel type, LabSen pH electrode adopts the following special electrolyte:

● Polymer: a new type of polymer reference electrolyte. Main technical features: The reference electrode is with single pore or

multi-pore, without diaphragm. The polymer electrolyte directly contacts with test samples. The anti-pressure capacity

can reach 6 bars. It is suitable for almost all applications, including samples containing oil, low ion concentration, protein,

and suspension.

● Protelyte: suitable for testing samples containing protein, low temperature samples and viscous samples

Swiss patented Technology- pH/Temp. Combination Structure

1669272937411.jpg

The LabSen pH electrode adopts Swiss patented pH/Temp. combination structure. The conventional way to make the

glass pH/Temperature combination electrode is to place the temperature sensor inside the bulb or electrode. As the bulb and the electrodes are filled with solution, the temperature sensing is very slow. Adopting the patented structure, the temperature sensor is placed in an independent cavity under the pH glass membrane. With built-in heat conducting medium, the temperature sensing speed can be increased by 40%. The response rate and stability of the pH electrode are greatly improved.

Double Junction pH Electrode for Ultrapure Water

The following picture is the sketch of LabSen pH electrode for ultra-pure water. There are two junctions and two reference cavities.

It is Junction I in movable sleeve form that will be in contact with ultrapure water. The reference solution is 1M KCl. The density

gradient and polarization effect on the glass membrane will be decreased and the measuring stability will be greatly improved.

1669272970007.jpg

pH Electrode with Pre-pressure

The Pre-pressurized electrode is an electrode prefilled with certain pressure. Even in highly viscous samples, the electrolyte can still infiltrate well, preventing from clogging, ensuring the stability and repeatability of measurement. This type of electrode is especially suitable for testing highly viscous samples, like cosmetics, paint, resin, etc.

 

Technical parameters

 Model

LabSen211

LabSen213

Name

Routine   pH Electrode

Routine   3-in-1 pH Electrode

Picture

1669273063225.jpg



1669273215166.jpg

Application

routine   laboratory use

routine   laboratory use

Features

impact-resistant   glass membrane

impact-resistant glass membrane, patented ATC   structure.

Body

Lead-free   Glass

Lead-free Glass

Temp. Probe

No

NTC 30kΩ

Junction

Ceramic

Ceramic

Reference

Long-life

Long-life

Electrolyte

3M KCl

3M KCl

Length

120mm

120mm

Diameter

12mm

12mm

Membrane Shape

Hemispherical

Cylindrical

Range

0~14 pH

0~14 pH

Temperature

-5~100℃

-5~100℃

Connector

BNC/1m   cable

BNC/RCA   1m cable

 

 Model

LabSen231

LabSen221

Name

Premium   pH Electrode

Premium   pH Electrode

Picture

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Application

suitable for wastewater, emulsion, suspension,   effluent.

suitable for viscous and low ion concentration samples.

Features

with 2-pore and solid electrolyte, hard to be   contaminated, high compression-resistance.

with movable sleeve and BNC connector.

Body

Lead-free Glass

Lead-free Glass

Temp. Probe

No

No

Junction

2-pore

Movable Sleeve

Reference

Long-life

Long-life

Electrolyte

Polymer

3M KCl

Length

120mm

130mm

Diameter

12mm

12mm

Membrane Shape

Hemispherical

Cylindrical

Range

0~14 pH

0~14 pH

Temperature

-5~80℃

-5~80℃

Connector

BNC/1m   cable

BNC/1m   cable

 

 

 Model

LabSen223

LabSen331

Name

Precise   pH Electrode

Plastic   Premium pH Electrode

Picture


1669273469692.jpg


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Application

suitable for viscous   and low ion concentration samples, integrated ATC structure.

suitable for   wastewater, emulsion,suspension, effluent

Features

with movable sleeve   and BNC/RCA

With anti-corrosion   body, 1-pore, solid

Body

Lead-free   Glass

POM

Temp. Probe

NTC 30kΩ

No

Junction

Movable   Sleeve

1-pore

Reference

Long-life

Long-life

Electrolyte

3M KCl

Polymer

Length

130mm

120mm

Diameter

12mm

12mm

Membrane Shape

Cylindrical

Spherical

Range

0~14 pH

 0~14 pH

Temperature

 -5~80


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