YOKOGAWA 866257000 high-precision temperature controller

YOKOGAWA 866257000 high-precision temperature controller

Product Overview

YOKOGAWA 866257000 high-precision temperature controller is an industrial grade precision temperature control equipment launched by Yokogawa Electric in Japan, belonging to the OpreX series of industrial control products. Its core is used for precise acquisition, real-time monitoring, and closed-loop control of temperature parameters in industrial production processes. This controller adopts advanced temperature detection and algorithm control technology, supports the integration of various temperature sensors such as thermocouples and thermal resistors, and can adapt to industrial scenarios with different temperature ranges and accuracy requirements. It has an intuitive operating interface and flexible communication expansion capabilities, and can seamlessly integrate with mainstream DCS systems and third-party industrial automation equipment in Yokogawa. It is widely used in fields such as petrochemicals, electronic manufacturing, new energy, and precision machining that require strict temperature control accuracy. The equipment adopts industrial grade high stability hardware design, with good resistance to electromagnetic interference and environmental fluctuations, and can operate stably for a long time in complex industrial environments, providing core guarantees for temperature consistency and process reliability in the production process.

Specification parameters

1. Core temperature control parameters

-Measurement range: Supports -200 ℃~1800 ℃, can automatically match the corresponding range according to the type of sensor connected; Among them, thermocouple type adaptation (K/J/S/R/B/E/T, etc.) covers a range of -200 ℃~1800 ℃; Thermistor type adaptation (Pt100/Pt1000/Ni100, etc.), with a range covering -200 ℃~850 ℃.

-Control accuracy: The measurement accuracy is ± 0.1 ℃ (connected to Pt100 sensor in a standard environment of 0 ℃~100 ℃), and the temperature resolution reaches 0.01 ℃; The control accuracy is ± 0.2% FS ± 1 digit, ensuring the precision and stability of temperature control.

-Control mode: Supports multiple modes such as PID (proportional integral derivative) control, self-tuning control, manual control, program segment control, etc; The program segment control can set up to 30 programs, with each program supporting a time setting of 0-9999 minutes, meeting the requirements of complex heating, insulation, and cooling processes.

2. Input and output parameters

-Input channel: 1-channel temperature signal input, supporting multiple signal types such as thermocouple (TC), thermistor (RTD), analog (4-20mA/0-10V), etc. Input impedance ≥ 10M Ω (analog input).

-Output channel: Standard configuration includes 3 control outputs, including 2 relay outputs (contact capacity: AC250V/5A, DC30V/5A) and 1 analog output (4~20mA DC, load resistance ≤ 500 Ω); Optional extension of 1 pulse output (used to drive SSR solid-state relays) to meet the driving needs of different actuators.

-Alarm output: 2 independent alarm outputs, supporting multiple alarm types such as high temperature alarm, low temperature alarm, sensor fault alarm, etc., with the same contact capacity as the control output relay.

3. Electrical and Communication Parameters

-Power requirements: Operating voltage is AC100~240V, 50/60Hz, power consumption ≤ 15VA; supports wide voltage input, compatible with industrial power supply standards in different regions.

-Communication interface: Standard RS-485 communication interface, supporting Modbus RTU communication protocol; Optional Ethernet interface, supporting Modbus TCP/IP protocol, can achieve remote data exchange and control with the upper computer system.

-Response time: The temperature measurement response time is ≤ 50ms (after the sensor is connected), and the control output response time is ≤ 100ms to ensure rapid response and timely adjustment to temperature fluctuations.

4. Physical and environmental parameters

-Installation method: Panel type installation, with installation holes that meet industrial standards (specific dimensions: 48mm × 96mm × 110mm, width × height × depth), suitable for installation in standard industrial control cabinets.

-Working environment: Operating temperature range of 0-40 ℃, relative humidity range of 25% -80% (without condensation); Storage environment temperature -30~70 ℃, relative humidity 10%~90% (no condensation).

-Protection level: IP65 (front panel), with good dust-proof and splash proof capabilities; The body is made of flame-retardant ABS material, which meets industrial safety standards.

-Anti interference capability: Compliant with anti-interference standards such as IEC 61000-4-2 (electrostatic discharge), IEC 61000-4-3 (radiated electromagnetic field), IEC 61000-4-4 (electrical fast transient pulse group), etc., suitable for complex industrial electromagnetic environments.

Performance characteristics

1. Ultra high precision temperature control and stability performance

The high-precision temperature acquisition circuit and adaptive PID algorithm independently developed by Yokogawa can achieve a measurement accuracy of ± 0.1 ℃ and a control accuracy of ± 0.2% FS, with a temperature resolution of 0.01 ℃. It can accurately capture small temperature fluctuations and adjust the control output in a timely manner. Equipped with sensor fault self diagnosis function, it can monitor the connection status of sensors in real time. When sensor disconnection, short circuit or other faults occur, it will immediately trigger an alarm and output a protection signal to avoid production accidents caused by temperature control. By selecting industrial grade high stability components and undergoing rigorous environmental adaptability testing, stable temperature control performance can be maintained even in complex environments such as high and low temperatures, humidity fluctuations, and electromagnetic interference, reducing equipment failure rates.

2. Flexible signal adaptation and expansion capabilities

Supporting multiple types of thermocouples, thermal resistors, and analog temperature signal inputs, it can meet the temperature detection needs of different scenarios without the need for additional conversion modules, greatly improving the device's versatility and adaptability. It has rich output interfaces and can directly drive various actuators such as relays, solenoid valves, SSR solid-state relays, etc. It also supports alarm output and communication expansion, and can flexibly configure control and monitoring links according to actual production needs. Optional Ethernet communication module is available to upgrade communication from RS-485 to Ethernet, meeting the integration requirements of industrial automation systems at different levels.

3. Intelligent control and convenient operation experience

Built in self-tuning function, which can automatically identify the thermal inertia parameters of the controlled object, intelligently optimize PID control parameters, and achieve the best temperature control effect without the need for manual debugging by professionals, reducing the operating threshold. Supports up to 30 program segment controls, can preset complex temperature change curves (such as multi-stage processes of heating insulation cooling), and has functions such as program pause, jump, and cycle, suitable for complex temperature control process requirements such as precision machining and material heat treatment. Equipped with a large-sized LCD backlit display screen, real-time display of key parameters such as measured temperature, set temperature, control status, alarm information, etc; The operation panel adopts a waterproof button design, with clear button feedback and support for parameter password locking to prevent accidental operation.

4. Reliable security protection and system compatibility

Equipped with comprehensive safety protection functions, in addition to sensor fault alarm, it also supports over temperature alarm, overload protection, power abnormal protection, etc. When abnormal situations occur, the control output is immediately cut off and an alarm signal is issued to ensure the safety of the production process and equipment. The front panel has a protection level of IP65, which can effectively resist dust and splash erosion in industrial sites and extend the service life of equipment. Deeply compatible with the Yokogawa Centum series DCS system and supporting standard Modbus communication protocol, it can seamlessly integrate into existing industrial automation systems, achieve centralized monitoring and remote control of temperature data, and reduce system upgrade and renovation costs.

Working principle

The core working logic of YOKOGAWA 866257000 high-precision temperature controller is to achieve precise control of the controlled object temperature through a closed-loop link of "temperature acquisition signal processing logic judgment control output", which is divided into three core links.

1. Temperature signal acquisition and conversion

Firstly, real-time temperature signals of the controlled object are collected through temperature sensors such as thermocouples and thermal resistors that are connected. Sensors convert temperature physical quantities into corresponding electrical signals (such as thermoelectric potential signals of thermocouples and resistance change signals of thermal resistors), and transmit them to the input channel of the controller. The signal conditioning circuit inside the controller filters, amplifies, and processes the input electrical signal to remove electromagnetic interference signals in industrial environments; Subsequently, the conditioned analog electrical signal is converted into a digital signal through a high-precision A/D (Analog/Digital) converter and transmitted to the core control unit.

2. Temperature judgment and control logic processing

After receiving the temperature digital signal, the core control unit compares it with the target temperature value preset by the user, and combines it with the preset control mode (such as PID control, program segment control) for logical operation. If PID control mode is adopted, the control unit will calculate the corresponding control quantity through PID algorithm based on parameters such as the deviation between the current temperature and the target temperature, the rate of deviation change, etc; If the program segment control mode is adopted, the control unit will execute the temperature target and time setting of each stage in sequence according to the preset program segment curve, and dynamically adjust the control quantity. In addition, the control unit monitors the real-time status of sensor signals and equipment operation status. If any abnormalities occur (such as temperature exceeding the threshold or sensor failure), the alarm logic is immediately triggered.

3. Control output and closed-loop regulation

The control unit sends control signals to the actuator (such as relays, solenoid valves, SSR solid-state relays, etc.) through output channels based on the calculated control quantity, driving the actuator to operate (such as controlling the start and stop of heating devices, adjusting the power of refrigeration equipment, etc.), and achieving temperature adjustment of the controlled object. At the same time, the temperature sensor continuously collects and adjusts the temperature of the controlled object, and feeds back the new temperature signal to the control unit, forming a closed-loop regulation link. The control unit continuously optimizes the control output based on feedback signals until the temperature of the controlled object stabilizes within the preset target range, ensuring the accuracy and stability of temperature control.