Intrinsically Safe Explosion-Proof Capillary Melt Pressure Transmitter PT124B-125/125T Series

Introduction – Intrinsically Safe Explosion-Proof Capillary Melt Pressure Transmitter PT124B-125/125T Series

The Intrinsically Safe Explosion-Proof Capillary Melt Pressure Transmitter PT124B-125/125T Series is a high-precision, high-reliability instrument engineered for pressure measurement and control in hazardous, high-temperature environments. Manufactured by ZHYQ, this model features a full-welded stainless-steel construction with intrinsically safe explosion-proof protection, ensuring reliable operation in flammable and explosive atmospheres.

Designed with a capillary structure, it effectively isolates the electronic housing from extreme process heat, making it ideal for use in plastic and rubber extrusion, chemical fiber spinning, and petrochemical processing systems. The PT124B-125T version integrates a temperature sensor (J, K, E, or PT100) to allow simultaneous measurement of pressure and temperature at the same point.

With its ±0.5% FS accuracy, 80% internal calibration, and anti-interference circuitry, this transmitter provides consistent, repeatable, and stable readings even under severe industrial conditions. Its 15-5PH stainless-steel diaphragm and mercury-filled capillary design enhance durability, corrosion resistance, and longevity.

Widely used in industrial automation, the PT124B-125/125T Series offers excellent compatibility with PLC systems and control instruments. As part of Dubai Sensor’s comprehensive range of melt pressure transmitters, it serves industries across the UAE and MENA region requiring dependable pressure solutions in challenging high-temperature and explosive environments.

Key Features & Benefits

• Intrinsically safe and explosion-proof all-welded design
  
• High measurement accuracy of ±0.5% FS
  
• Excellent stability, repeatability (±0.2% FS), and anti-interference
  
• Stainless steel wetted parts with 15-5PH diaphragm for durability
  
• Capillary design protects electronics from process heat
  
• 80% internal calibration signal simplifies setup and maintenance
  
• Zero and full-scale adjustment supported
  
• Wide pressure range: 0 … 100 bar to 0 … 1500 bar
  
• Maximum operating temperature up to 400 °C
  
• IP65-rated protection ensures resistance to harsh environments
  
  

Technical Specifications – Intrinsically Safe Explosion-Proof Capillary Melt Pressure Transmitter PT124B-125/125T Series

Standards & Certifications

• Explosion-proof construction – Intrinsically safe design for hazardous areas
  
• Ingress Protection: IP65
  
• Quality compliance: Built in accordance with industrial instrumentation standards ensuring accuracy, stability, and repeatability in demanding applications
  
  

Applications & Industries

• Chemical fiber drawing and spinning equipment
  
• Plastic and rubber extrusion and molding machinery
  
• Steam and petrochemical process control systems
  
• Food packaging and medical processing equipment
  
• High-temperature and explosive industrial environments across the UAE and MENA region
  
  

Installation, Commissioning & Maintenance

• Keep the protective cap on until installation; verify correct mounting hole dimensions.
  
• Use an aluminum gasket to ensure proper sealing.
  
• Install the transducer only when polymer is molten; clean the diaphragm immediately after removal.
  
• Keep the electronic housing below 80 °C to ensure long service life.
  
• Avoid pressure overload beyond the rated range to maintain accuracy and prevent damage.
  
• Use shielded cables and ground one end only to prevent signal interference.
  
  

Why Choose Intrinsically Safe Explosion-Proof Capillary Melt Pressure Transmitter PT124B-125/125T Series

The PT124B-125/125T Series series stands out for its precision, safety, and long-term reliability. With its explosion-proof welded design, advanced anti-jamming electronics, and robust 15-5PH stainless-steel diaphragm, it delivers dependable performance in extreme conditions.

Its capillary isolation, high repeatability, and intrinsic safety make it a trusted choice for automation systems that demand both accuracy and resilience. Supported by Dubai Sensor’s technical expertise and regional availability, this transmitter ensures optimal productivity and operational safety across high-temperature industrial sectors.

Ordering Guide

To purchase or specify the correct configuration, refer to the pressure range, output signal, and process thread requirements.
Dubai Sensor is the official distributor of the PT124B-125/125T Series series in the region.

FAQ – Intrinsically Safe Explosion-Proof Capillary Melt Pressure Transmitter PT124B-125/125T Series

Q1: What is the difference between PT124B-125 and PT124B-125T?
A: The PT124B-125 is the standard intrinsically safe explosion-proof melt pressure transmitter, while the PT124B-125T model includes a built-in temperature sensor (J, K, E thermocouple or PT100) for simultaneous temperature and pressure measurement at the same point.

Q2: What pressure ranges are available for the PT124B-125/125T Series?
A: The transmitter is available in pressure ranges from 0 to 10 MPa up to 150 MPa, equivalent to 0 to 100 bar up to 1500 bar, depending on the model configuration.

Q3: Can this transmitter operate at high temperatures?
A: Yes. The PT124B-125/125T Series can withstand medium temperatures up to 400 °C, while the electronic housing should be kept below 80 °C to maintain long-term accuracy and stability.

Q4: What is the accuracy of this melt pressure transmitter?
A: It offers a comprehensive accuracy of ±0.5% full scale, including linearity, repeatability, and hysteresis, with repeatability of ±0.2% FS.

Q5: What are the available output signals?
A: The device supports 4–20 mA (2-wire), 0–10 V, and 0–5 V output signals, allowing compatibility with PLC systems and digital controllers.

Q6: What materials are used in the wetted parts?
A: The wetted diaphragm and housing are made of stainless steel coated with 15-5PH, providing excellent corrosion and wear resistance.

Q7: What type of filling medium is used?
A: The internal filling medium is mercury, chosen for its stable transmission characteristics in high-temperature environments.

Q8: What are the process connection options?
A: Available threads include ½″-20 UNF, M14×1.5, M18×1.5, M22×1.5, and G¾, suitable for different installation standards.

Q9: How is calibration performed?
A: Each transmitter includes an 80% internal calibration signal, allowing easy verification and zero/full-scale adjustment during commissioning.

1. Q10: Is the PT124B-125/125T Series certified for explosion-proof applications?
   A: Yes. It is an intrinsically safe explosion-proof design, engineered for use in hazardous zones with flammable or explosive gases, ensuring safe operation under such conditions.