Technical Specifications of PT100 Acid-Base Resistant Temperature Sensor: Material, Accuracy and Installation Method
In environments with strong corrosiveness such as in chemical industries, electroplating, metallurgy, and wastewater treatment, ordinary stainless steel Temperature Sensors often get corroded and perforated within just a few months, resulting in signal drift and equipment shutdown. How to choose a truly acid-base resistant, corrosion-resistant, and long-term stable temperature sensor? This article starts from the three core parameters of material, accuracy, and installation method, and provides you with detailed explanations on the selection points of PT100 acid-base resistant Temperature Sensors.
- Why choose the PT100 acid and alkali resistant Temperature Sensor?
PT100 is the most widely used thermal resistance sensor in the industrial field, featuring good linearity, high accuracy, and strong stability. The acid and alkali resistant PT100 is based on the ordinary platinum resistance and is enhanced by special protective tube materials and sealing processes, enabling it to work continuously in strong corrosive media such as sulfuric acid, hydrochloric acid, sodium hydroxide, electroplating solutions, and electrolytes. It is an ideal choice for scenarios such as chemical reaction vessels, electroplating tanks, and acid washing lines.
- Core Parameter 1: Liquid Contact Material (Key to Corrosion Resistance)
The service life of the acid-base temperature sensor is 90% dependent on the material of the protective tube that comes into contact with the medium. Different acid-base media, concentrations, and temperatures require different material choices:
| Material | Applicable Scenarios | Temperature Range | Characteristics |
| PTFE (Polytetrafluoroethylene / Teflon) | Strong acids, strong bases, organic solvents, suitable for most corrosive media | -50℃~ 260℃ | Excellent corrosion resistance, hardly reacts with any chemical substances, high cost performance ℃ |
| Titanium Alloy (TA2) | Electroplated chromium, seawater, chlorine alkali, nitric acid and other oxidizing acid environments | -50℃~ 300℃ | Excellent resistance to chloride ion corrosion, suitable for media containing chlorine
|
| Hayes Alloy (C276/B3) | Extreme corrosive environments such as high-temperature hydrochloric acid, sulfuric acid, wet chlorine gas | -50℃~ 400℃ | Optimal corrosion resistance, suitable for high-temperature and high-concentration strong acids
|
| 316L Stainless Steel | Weak acids and bases, neutral media, or inner core support of fluorine-encapsulated structure | -50℃~ 500℃ | Basic corrosion-resistant material, not recommended for direct use in strong acid and base media
|
- Selection Recommendation:For common electroplated solutions and chemical media, PTFE (tetrafluoroethylene) wrapped type is the most cost-effective choice; if the medium contains chloride ions and the temperature is high, titanium alloy is recommended; if it is high-temperature concentrated sulfuric acid or hydrochloric acid, Hayes alloy should be selected.
Teflon temperature sensor
Acid and alkali resistant and temperature-sensing sensor
- Core Parameter 2: Accuracy Grade (Guarantee of Measurement Accuracy)
The accuracy of the PT100 temperature sensor directly affects the quality of process control. According to the IEC 60751 standard, the commonly used accuracy grades are as follows:
| Accuracy Class | Allowable deviation (at 0℃) | Applicable scenarios |
| Class A | ±0.15℃ | For precise temperature control, temperature control of reaction vessels, and laboratory-level requirements
|
| Class B | ±0.30℃ | For industrial routine temperature measurement, such as electroplating tanks, storage tanks, and pipelines
|
| 1/3 Class B | ±0.10℃ | For high-precision measurement, such as in pharmaceuticals and bioreactors
|
- Selection suggestion:For most industrial acid and alkali-resistant scenarios, Grade B is sufficient to meet the requirements; if the process is highly sensitive to temperature (such as in fine chemicals or when the quality of electroplating layers is sensitive to temperature), it is recommended to choose Grade A.
Ⅳ. Core Parameter 3: Installation Method (Adapted to On-site Conditions)
The installation method of the sensor determines its sealing performance, ease of replacement, and compatibility with existing equipment interfaces. Common installation methods include:
| Installation method | Structural features | Applicable scenarios
|
| Threaded installation | Standard threads (such as M20×1.5, G1/2), directly screwed into the equipment interface | For pipelines, small reactors, and storage tanks, installation is simple and sealing is reliable |
| Flange installation | With flange disc, fixed by bolts | For large reactors and tanks, with strong pressure-bearing capacity, and convenient for disassembly and maintenance
|
| Clamp installation | Hygienic quick-connect interface | For the pharmaceutical and food industries, or scenarios requiring frequent disassembly and cleaning
|
| Insertion/Intrusion type | Probe directly inserted into the medium, without fixed interface | For open liquid surface scenarios such as electroplating tanks and wastewater ponds, flexible and convenient
|
- Selection suggestion:Threaded installation is suitable for the vast majority of industrial pipelines and tanks; Flange installation is suitable for large-sized openings or high-pressure environments; For open liquid surface scenarios such as electroplating tanks, it is recommended to choose the insertion type + PTFE protective sleeve structure.
- Summary: How to Select the Model Quickly?
- Based on the on-site conditions,follow the following three steps to quickly determine the model:
- Material selection:Choose the protective tube material (PTFE/titanium/hastelloy) based on the type, concentration and temperature of the medium.
- Accuracy level:Select A-level or B-level based on the temperature control requirements.
Installation method: Select the appropriate connection type (thread, flange or insert type) based on the equipment interface.
About Us
We specialize in the research and production of corrosion-resistant Temperature Sensors. We have extensive experience in the fields of chemical engineering, electroplating, and environmental protection. Our products support non-standard customization, and we can provide one-on-one selection solutions based on your medium concentration, temperature range, and installation dimensions.
If you need assistance with product selection or product quotations, please feel free to contact us. We offer free technical support.