Stable Wide-Range Electrode：E-202

E-202 pH composite electrode is a universal pH detection tool suitable for laboratory and on-site scenarios. It adopts gel KCl electrolyte+double liquid junction structure, and has the characteristics of wide range and high stability, which can meet the demand for accurate pH measurement of conventional water quality and solution.

★★★★★

  • Short delivery time
  • Better price
  • Customizable parameters

Core product advantages

  • Wide adaptation scenarios: pH range covering 0-14, able to withstand temperatures of 0-60 ℃ and pressures of 0-0.3MPa, suitable for various testing needs such as laboratory water samples and on-site process fluids.
  • High stability: gel KCl electrolyte+double liquid junction structure, strong anti-interference ability, theoretical percentage slope ≥ 95% (25 ℃), accurate and reliable test data.
  • Easy to maintain: When idle, it only needs to be soaked in a 3.3mol/L KCl solution for storage, with simple daily cleaning and suitable for high-frequency use scenarios.
  • Easy installation: equipped with 5-meter-long coaxial wire and BNC plug, supporting quick connection to most pH instruments, with low operating threshold.

Specifications

ParameterValue
Measurement Range0-14 pH
Temperature Range0-60℃
Pressure Range0-0.3M Pa
Thread Size3/4 inch NPT
Zero Potential7±0.5
Internal resistance (25 ℃) ≤ 100 M Ω
Theoretical percentage slope≥ 95%(25℃）
Cable configuration5-meter coaxial wire+BNC plug

Scope of Application

Laboratory routine testing: suitable for pH measurement of water samples and reagent solutions in scientific research and quality inspection laboratories, with a wide range covering most experimental needs.

On site process fluid monitoring: It can be used for pH detection of process fluids in small and medium-sized production scenarios (such as solution pH control in light industry and food industry), can withstand a pressure of 0.3MPa, and is suitable for low-pressure pipeline/container environments.

Rapid water quality detection: Suitable for rapid pH screening of surface water, tap water and other water quality in the fields of environmental protection and water management, with easy operation and stable data.

Usage, maintenance and precautions

Preparation before measurement:

Clean the electrode with distilled water or deionized water before use, absorb the water with filter paper, and ensure that the sensitive membrane and liquid interface are submerged in the measured liquid at the same time.

Idle storage:

When the electrode is not in use, it needs to be soaked in a protective cover of 3.3mol/L KCl solution. It is strictly prohibited to soak it in distilled water, protein solution, or acidic chloride solution for a long time to avoid contact with organic silicone oil.

Cleaning and Calibration:

It is recommended to clean the electrode once a week. If the sensitive film appears semi transparent/deposited, it can be soaked in dilute hydrochloric acid and rinsed; Coordinate instrument calibration once a week to ensure testing accuracy.

Fault handling:

If the electrode cannot complete calibration, it indicates that the performance has deteriorated and needs to be replaced with a new one.

Sensor diagram illustration

  1. After opening the packaging, check whether there is mechanical damage to the sensitive bulb and electrode body of the sensor;
  2. Remove the sensor protective cover and check if there are any bubbles in the sensitive bulb of the electrode. If so, gently shake the electrode in a vertical plane to remove the bubbles;
  3. Select the corresponding sensor sleeve or cable head for installation according to different sensors;
  4. The connection between the sensor wire and the sensor is not waterproof, please make sure to do a good job of waterproofing.

Wire stripping instructions

Attention

  • The outer layer of the transparent central axis is covered with a conductive rubber layer and a metal mesh layer. When stripping, first strip the metal mesh layer into the metal mesh as shown in the picture, and be sure to removal of conductive black skin on the transparent central axis;
  • The cable extends to the host without any contact points except for a dedicated junction box.

Technical Support

BNC is a universal plug type for pH instruments. As long as the instrument interface is BNC specification, it can be directly connected without the need for additional adapter accessories.

The dual liquid interface structure is equivalent to adding a “buffer isolation layer” between the electrode and the measured liquid: the outer liquid interface directly contacts the measured liquid and can block most impurities from entering; The inner layer liquid interface is connected with the gel KCl electrolyte, which can not only maintain the stability of ion conduction, but also prevent the pollutants in the measured liquid from directly eroding the core sensing components of the electrode. This design can significantly reduce the adhesion speed of impurities at the sensitive membrane and liquid interface, reduce cleaning frequency, and extend the stable working time of the electrode.

A 5-meter-long coaxial wire can meet the scenario requirements of “electrodes at the detection point and instruments in the operation area” without the need for additional extension cables, which not only avoids signal attenuation but also enhances the operational flexibility of on-site detection.

The rated temperature range of E-202 is 0-60 ℃. When used within this range, the internal resistance and response speed of the electrode may fluctuate slightly, but it can still maintain stable detection performance (note: high temperature will accelerate electrode loss, it is recommended to shorten the calibration cycle appropriately in high temperature scenarios); If the temperature exceeds this range, the sensitive membrane activity of the electrode will significantly decrease, and even physical damage may occur, resulting in serious distortion of the detection data. Therefore, it is strictly prohibited to use it in environments below 0 ℃ or above 60 ℃.

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Whether it is precise reagent pH calibration in the laboratory or process liquid monitoring in low-pressure containers on the production site, the E-202 pH composite electrode can adapt to these scenarios with stable performance – it has no complex operating threshold, but can continuously output reliable data in daily high-frequency use, making it a typical representative of “practical detection tools”.

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