Eurotherm P304C / Dynisco ATC880 Melt Pressure Controller — 1/4 DIN, PID, Modbus

Eurotherm P304C — Melt Pressure Controller (Replaces Dynisco ATC880)

The Eurotherm P304C is a precision melt pressure controller manufactured by Eurotherm (now part of Schneider Electric / Watlow). It serves as the direct replacement for the legacy Dynisco ATC880 melt pressure controller, offering backward-compatible functionality with enhanced features including improved PID algorithms, faster loop update, and modern digital communications. The P304C is designed for continuous monitoring and closed-loop control of melt pressure in plastics processing equipment.

Technical Specifications

Key Features

• Direct ATC880 Replacement — Drop-in replacement for the Dynisco ATC880 with compatible strain gauge input wiring, panel cutout dimensions, and process functionality; minimizes downtime during controller upgrade

• Precision PID Control — Advanced PID algorithm with auto-tune (from manual mode) and adaptive tuning (in auto mode) delivers fast, stable pressure control with minimal overshoot

• 50ms Loop Update — Rapid 50ms control loop cycle time ensures responsive pressure regulation in high-speed extrusion and injection molding processes

• Three-Color LED Display — High-visibility red/green/amber 5-digit display provides at-a-glance process status indication, with color changes configurable for alarm conditions

• Modbus RTU Communications — RS-485 Modbus RTU enables integration with PLC/SCADA systems, data loggers, and plant-wide monitoring networks

• iTools Configuration — Full software configuration, parameter cloning, data logging, and process monitoring via Eurotherm's free iTools PC software with USB Configuration Clip

P304C vs. Dynisco ATC880 — Key Differences

Typical Applications

• Plastics Extrusion — Melt pressure monitoring and closed-loop control at the extruder head, die, or screen changer to ensure consistent product quality and protect against overpressure

• Injection Molding — Cavity pressure measurement and control for precision molding of automotive, medical, and consumer plastic parts

• Blow Molding — Parison pressure control for consistent wall thickness in bottles, containers, and industrial tanks

• Compounding & Pelletizing — Die face pressure monitoring during polymer compounding and pelletizing operations

• Rubber Processing — Melt pressure control in rubber extrusion and calendering lines

• Food & Pharma Extrusion — Pressure monitoring in food-grade and pharmaceutical extrusion processes requiring validated control loops

Condition & Warranty

This is a new, original Eurotherm product in factory packaging. Each unit is inspected before shipment. A 3-month warranty covers manufacturing defects (in addition to Eurotherm's standard 3-year product warranty). User manual and iTools configuration software available for download. Technical support via WhatsApp and email.