STURDY pH/ORP SENSOR GRT1120PDW

The GRT1120PDW differential pH sensor has new differential technology and is built to last, so it can correctly monitor in tough conditions. It fixes the problems that traditional dual electrode pH sensors often have when measuring acidic/alkaline substances, alcohol, hydrocarbons, and other chemicals. These problems include reference electrode contamination and closed-loop interference, which lead to wrong data and the need for frequent maintenance. Offer stable and dependable ways to measure a wide range of complicated chemical media.

★★★★★

  • Short delivery time
  • Better price
  • Customizable parameters

Features

  • It adopts gel dielectric and two-point ceramic core liquid interface, double salt bridge reference structure, and can be directly used in industrial processes with high viscosity suspension, emulsion, protein and other liquid parts that are easy to block;
  • No need to supplement dielectric, low maintenance required;
  • Adopting PG13.5 threaded socket, it can be used for electrode exchange abroad;
  • Electrode lengths of 120, 150, 200, 250, and 300mm can be selected as needed;
  • Used in conjunction with PVC sheath or PP sheath

Specifications

ParameterValue
pH Range0-14
ORP Range-1500—+1500mV
SensitivitypH：±0.01pH ORP：±0.5mV
Temperature Range0-60℃
Pressure resistance3bar

Core product advantages

Differential technology empowerment:

Three electrodes replace traditional dual electrodes, reducing reference pollution, eliminating closed-loop circulation, and improving measurement accuracy and reliability;

Extended lifespan:

3/4 “plastic shell models support salt bridge replacement, reducing usage costs;

Strong adaptability:

PG13.5 threaded interface, can be installed with corresponding protective sleeve/cable head, suitable for various working conditions.

Accurately adapting to the scene

  • Chemical production: pH/ORP monitoring of acid-base substances, organic solvents, hydrocarbons and other media;
  • Industrial wastewater: parameter control of high concentration organic and acid-base wastewater treatment process;
  • Fine chemicals/pharmaceuticals: high-precision measurement of aromatic compounds and special solvents;
  • Petrochemical industry: monitoring of hydrocarbon and ketone production/recovery processes;
  • Special materials: chemical property testing for the production of lipids and special resins.

Usage and Maintenance Guide

To maximize the performance and extend the lifespan of GRT1120DW, it is important to pay attention to these practical points:

  • Before measurement, clean the sensor with distilled water and absorb the moisture to ensure that the bulb and the liquid junction are submerged in the measured liquid at the same time, avoiding impurities from entering and affecting the data;
  • Soak in 3.3Mol/L KCL solution when idle, and avoid long-term immersion in distilled water, protein solution, or acidic chloride solution. Keep away from organic silicon oils and fats;
  • Clean and calibrate once a week, wash the glass film sediment with dilute hydrochloric acid, and prohibit scratching the sensitive film with a hard brush;
  • Strictly follow the HF concentration resistance specifications to avoid sensor damage caused by over concentration and over temperature conditions.

Sensor diagram illustration

  1. After opening the packaging, check whether there is mechanical damage to the sensitive bulb and electrode body of the electrode;
  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 sensor in a vertical plane to remove the bubbles;
  3. Select the corresponding sensor sleeve or cable head for installation according to different electrodes;
  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

The core advantage lies in differential measurement technology – using a three electrode design instead of traditional dual electrodes, which can effectively reduce reference electrode connection pollution, eliminate closed-loop circulation problems, not only improve measurement accuracy (pH ± 0.01pH) and reliability, but also reduce failure time and maintenance costs, and better adapt to harsh chemical environments.

In conventional concentrations of water-based or organic media, the electrode response time is ≤ 30 seconds, which can meet the needs of industrial real-time monitoring; Even in high viscosity or high concentration organic solvents, the response time will only be slightly extended to 60 seconds without visible stuttering. This is thanks to the advantages of its differential measurement technology, where the three electrode structure optimizes ion conductivity efficiency. Compared to traditional dual electrodes, it has more advantages in complex media, and can quickly provide pH/ORP values even when facing viscous or high concentration media, without affecting the timeliness of process regulation.

This electrode can be adapted for short-term measurement of low concentration chlorine containing or strongly oxidizing media, but its core adaptation scenario is the conventional harsh working conditions of various chemicals, not specifically customized for high concentration strongly oxidizing environments.

When used in such media for a long time, it is recommended to use a dedicated anti-corrosion sheath and shorten the cleaning and calibration cycle – high concentrations of strong oxidants may accelerate the aging of electrode surface materials and salt bridge losses, and timely maintenance can effectively delay performance degradation. Immediately rinse the electrode thoroughly with distilled water after use to avoid residual corrosion of the reference system and ensure measurement stability.

60 ℃ is the rated maximum working temperature of the electrode. Long term continuous use at this temperature will slightly accelerate the aging of internal components of the electrode. Under normal working conditions, the theoretical lifespan of 1-2 years may be shortened to about 1 year, depending on the corrosiveness of the medium and maintenance frequency.

If the lifespan needs to be extended, it is recommended to use a cooling jacket to control the medium temperature below 50 ℃, and increase maintenance frequency: clean the electrode once a week, calibrate it once a month, and replace the damaged salt bridge of the 3/4 “plastic shell model in a timely manner to avoid double damage to the electrode caused by high temperature combined with medium corrosion.

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Whether it is organic solvent monitoring in chemical production or pH/ORP measurement of various acidic and alkaline substances, the GRT1120PDW differential pH electrode can confidently respond to harsh working conditions with its advantages of precision, durability, and low maintenance. Its differential technology solves the core pain points of traditional sensors, and the replaceable design of the salt bridge further reduces the cost of use, making it a cost-effective choice for monitoring complex chemical environments in industry. Consult now to obtain exclusive selection and installation guidance, making monitoring in harsh working conditions more worry free and reliable!

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