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:

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.　

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.

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

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.

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
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	LabSen223	LabSen331
Name	Precise   pH Electrode	Plastic   Premium pH Electrode
Picture
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