In the world of precision plastics manufacturing, every fraction of pressure counts. ZHYQ’s PT124B Series Melt Pressure Transmitter provides real-time insight into melt pressure fluctuations—helping manufacturers achieve stable molding quality, reduced defects, and greater production efficiency.
⚙️ 1. Application Scenarios & Core Functions
💡 Real-Time Pressure Monitoring
During the injection stage, molten plastic is pushed into the mold cavity at pressures typically between 80–120 MPa.
The melt pressure transmitter continuously monitors and feeds this data to the control system, ensuring proper filling, preventing under-injection or overload, and enabling closed-loop compensation during the holding stage to reduce shrinkage marks and internal stress.
⚙️ Process Optimization
By integrating melt pressure, mold temperature, and screw speed data, the system dynamically adjusts molding parameters, shortening the cycle time by 5–10% and improving consistency.
🔄 Closed-Loop Control Integration
Traditional machines rely on hydraulic pressure as an indirect indicator, leading to large deviations.
The PT124 series directly measures true melt pressure and outputs a 4–20mA or 0–10V signal to the PLC, enabling precise closed-loop control and increasing product yield to 99.99%.
🧪 Special Process Adaptation
- Gas-Assisted Injection Molding: Real-time pressure tracking helps optimize gas penetration, minimizing “fingerprint” and flow mark defects.
- Thin-Walled & Precision Parts: With ±0.05%FS/°C temperature drift, even the smallest pressure fluctuations are captured to prevent warpage and ensure dimensional accuracy.
🧠 2. Technical Principle & Design Features
Working Principle
The transmitter employs a high-temperature-resistant diaphragm (316L stainless steel or PTFE-coated) that converts melt pressure into electrical signals via the piezoresistive effect.
A temperature-compensation algorithm corrects for thermal drift from –10°C to 450°C, ensuring ±0.5%FS accuracyunder high-heat conditions.
Structural Design Highlights
- Diaphragm Isolation: Prevents melt solidification and blockage, ideal for high-viscosity materials (nylon, polyester).
- Rugged Construction: IP65-rated enclosure for oil, dust, and impact resistance in harsh production environments.
- Fast Response: 5ms rise time for instant pressure feedback—eliminating process lag.
🏆 3. Core Advantages of the PT124B Series
Since its founding in 1999, Shanghai ZHYQ Pressure Instrument Co., Ltd. has been a leading force in melt pressure measurement.
The PT124B Series has become a trusted choice across China’s injection molding sector, renowned for its reliability and precision.
🔹 High Precision & Stability
- Long-term stability: 0.1%FS/year
- Vibration resistance: Operates stably under 20Hz–1kHz mechanical vibration
- Wide range: 0–300MPa with 150%FS overload protection
🌍 4. Intelligent Manufacturing Advantages
🌱 Energy Saving & Cost Control
By optimizing injection pressure, the system reduces clamping force requirements and overall energy consumption, while cutting material waste by 15–30% in gas-assisted processes.
🤖 Smart Integration & IoT Connectivity
Supports HART protocol and industrial IoT systems, enabling remote monitoring, predictive maintenance, and mold life extension (reduces screw wear by ~20%).
With the integration of AI algorithms and industrial IoT, real-time pressure data now drives adaptive optimization, pushing injection molding toward high efficiency, low carbon, and intelligent production.
🧩 5. Selection & Installation Recommendations
- Range Selection: Choose a range based on maximum injection pressure (typically 100–200MPa) with 20% safety margin.
- Temperature Adaptation: For melt temperatures above 350°C, select an alloy-filled model (resistant up to 450°C).
- Installation: Use standard M14×1.5 threaded interface, directly mounted on the nozzle or barrel to minimize delay. Shield signal cables to prevent EMI interference.
💬 ZHYQ — Precision in Every Measurement
With more than two decades of innovation, ZHYQ continues to empower manufacturers with high-precision sensing technology.
The PT124B Series Melt Pressure Transmitter is not just a component — it’s the data-driven heart of intelligent injection molding, ensuring every product is consistent, efficient, and defect-free.