Digital Temperature Controller for Melt Flow Index Testers

Product Specifications

Technical details and manufacturing context for Digital Temperature Controller

Definition

The Digital Temperature Controller is a critical component of the Polymer Melt Flow Index Tester, responsible for precisely controlling the temperature of the heating barrel where the polymer sample is melted. It ensures the polymer reaches and maintains the specific test temperature (e.g., 190°C, 230°C) as required by standards like ASTM D1238 or ISO 1133, which is essential for obtaining accurate and repeatable melt flow rate (MFR) or melt volume rate (MVR) measurements. The controller operates within a temperature range of 0–400 °C, with a control accuracy of ±0.1 °C and a resolution of 0.1 °C. It uses a Pt100 sensor (Class A, per IEC 60751) to measure the actual temperature. The device accepts universal input power of 100–240 V AC (50/60 Hz) and consumes no more than 5 W. It features a solid-state relay (SSR) output for heater control and employs an auto-tuning PID control method for stable regulation. The controller is designed for an ambient operating temperature of 0–50 °C and a non-condensing humidity range of 20–85% RH. It has an ingress protection rating of IP54 (per IEC 60529) and is equipped with a red LED display (4 digits). For data logging and remote monitoring, it offers an RS485 communication interface supporting Modbus RTU. The unit dimensions are 48×48×80 mm, with a panel cutout of 45×45 mm. This component is intended for integration into melt flow index testers; users must verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

The controller uses a temperature sensor (typically a thermocouple or RTD) embedded in the heating barrel to measure the actual temperature. This measured value is compared to the user-set target temperature. Based on the difference (error), the controller's microprocessor calculates and sends a control signal (often via Pulse Width Modulation - PWM) to a solid-state relay (SSR) or similar device, which regulates the power supplied to the heating elements. This feedback loop continuously adjusts the heat output to minimize temperature deviation and maintain stable, precise thermal conditions.

Common Materials

Electronic components (microprocessor, resistors, capacitors), PCB (Printed Circuit Board), Plastic/Metal enclosure, Display (LCD/LED), Connectors and wiring

Technical Parameters

Parameter	Typical range	Notes & selection driver
Temperature Range	0–400 °C	Covers typical polymer melt temperatures
Control Accuracy	±0.1 °C	Ensures precise melt index measurements
Resolution	0.1 °C	Display resolution
Sensor Type	Pt100	Class A platinum resistanceIEC 60751
Input Power	100–240 V AC	Universal input, 50/60 Hz
Power Consumption	≤5 W	Low power for continuous operation
Output Type	SSR	Solid state relay for heater control
Control Method	PID	Auto-tuning PID for stable control
Ambient Temperature	0–50 °C	Operating environment
Humidity Range	20–85 % RH	Non-condensing
Ingress Protection	IP54	Dust and splash protectionIEC 60529
Display Type	LED	Red LED, 4 digits
Communication Interface	RS485	Modbus RTU for data logging
Dimensions	48×48×80 mm	Panel cutout 45×45 mm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Microprocessor/CPU
Processes sensor input, runs control algorithm (PID), and generates output signals.

Material: Semiconductor (Silicon)
Temperature Sensor Input Part
Accepts and conditions the signal from the thermocouple or RTD for the microprocessor.

Material: Electronic components
User Interface (Keypad & Display)
Allows the operator to set the temperature and view current/ setpoint values.

Material: Plastic, glass (LCD)
Power Control Output
Switches the power to the heating elements (often via a Solid-State Relay driver).

Material: Electronic components (transistors, optocouplers)
Power Supply
Converts mains AC voltage to the low-voltage DC required by the controller's electronics.

Material: Electronic components (transformers, rectifiers, regulators)

Manufacturers of Digital Temperature Controller

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Xiamen Maxwell Automation Limited

Fujian, CN

Founded 2011

Also makes: PID Temperature Controller, Signal Processor, Temperature Controller and 9 more

Listed on the company's own website · profile compiled by CNFX from public sources

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Frequently Asked Questions

What is the temperature range of this controller?

The controller has a temperature range of 0–400 °C, covering typical polymer melt temperatures. However, the actual usable range may depend on the specific model and application; always verify with the manufacturer.

What type of temperature sensor does it use?

It uses a Pt100 sensor, which is a Class A platinum resistance thermometer per IEC 60751. This sensor provides accurate temperature measurement for precise control.

How does the controller maintain stable temperature?

It employs an auto-tuning PID control method. The controller continuously compares the measured temperature to the setpoint and adjusts the power to the heating elements via a solid-state relay (SSR) output, minimizing deviation.

Can this controller be integrated into existing systems?

It offers an RS485 communication interface with Modbus RTU protocol, allowing integration with data logging or monitoring systems. However, compatibility should be confirmed with the manufacturer or supplier.

Data Basis

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Preliminary Technical Classification

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pressure:	Atmospheric to 5 bar (for barrel heating system)
other spec:	Control accuracy: ±0.5°C, Response time: <2 seconds for 10°C step change
temperature:	Ambient to 400°C (typical polymer processing range)

Digital Temperature Controller

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