ATSL-RN Automatic Temperature Calibration System

1. System Overview

The ATSL-RN group-controlled thermal automatic system is the latest product developed by our company through the introduction of advanced technology. The ATSL-RN group-controlled thermal automatic system is a measurement and control system composed of a high-end microcomputer as the core, equipped with high-precision imported digital multimeters, intelligent low-potential scanning switches, and management software. The operator can conveniently perform the entire process operation with the mouse under the operating system. The microcomputer system displays in real time the temperature control curve of the calibration furnace (or oil bath, low-temperature bath, etc.), the measured temperature, the calibration running time, output power, cold end temperature, temperature fluctuation, and other parameters. The system processes data completely in accordance with the current national metrological verification regulations, and can print various record forms and verification certificates, and also retain original records for future reference. The system fully realizes the full automation of the verification process for thermocouples and thermal resistances, namely: automatic temperature control, automatic verification, automatic data processing, automatic printing of verification results, and automatic saving of heating curves. This greatly reduces the labor intensity of the operator and improves the quality of verification work. This device also provides the system's certification procedures and data file management programs, providing convenience for operators to certify the system and archive, retrieve, and query verification results.

Purpose: The ATSL-RN group-controlled thermal automatic system can be used to verify various types of industrial thermocouples, thermal resistances, second-class standard thermocouples, expansion thermometers, glass liquid thermometers, bimetallic thermometers, and pressure thermometers.

2. Technical Specifications

1) Parasitic potential of scanning switch:≤0.2μV；

2) Accuracy:

Uncertainty of potential measurement ≤0.01%；

Uncertainty of resistance measurement ≤0.01％；

Uncertainty of thermocouple calibration ≤1.2℃；

Uncertainty of RTD calibration ≤0.05℃；

Potential measurement error: ≤±0.005%；

Resistance measurement error: ≤±0.01%；

3) Resolution: potential: 0.01μV ; resistance: 0.01mΩ；

4) Temperature control accuracy: when calibrating thermocouples, the temperature deviation from the calibration point shall not exceed ±2℃; when calibrating thermal resistances, the temperature deviation from the calibration point shall not exceed ±0.5℃；

5) Temperature stability: After the thermocouple calibration process reaches a constant temperature, the furnace temperature change rate≤0.2℃/min; After the RTD calibration process reaches a constant temperature, the oil bath temperature change rate≤0.04℃／10min；

6) Calibration temperature: Thermocouple300～1600℃ Any point; Low-temperature thermocouple, RTD-100～300℃ Any point;

7) Verification count: Each module of thermocouple (resistance) can verify 1 to 10 pieces simultaneously.

8) Thermocouple graduation numbers that can be verified: S, K, E, R, B, T, N, J;

9) Thermal resistance graduation numbers that can be verified:Pt100、Pt50、Pt10、Cu100、Cu50、BA1、BA2、G；

10) Average calibration heating and calibration time per point: about 30 minutes.

3. Main configuration

The ATSL-RN group-controlled thermal automatic system mainly consists of the main control module chassis, digital multimeter, calibration furnace, low-temperature bath, oil bath, thermal measurement management system software, and other parts. (See figure)

1) Main control module chassis: The main control module chassis is composed of subsystems such as the intelligent low-thermal EMF scanner/control system and temperature control instruments. It adopts a low-thermal EMF silver-plated scanning switch, with small and stable parasitic EMF; uses silicon controlled rectifier (SCR) with phase-shift triggering, providing stable temperature control and strong anti-interference; adopts Japan Shima DenkiSR23Temperature controller, ten-segment PID control, precise temperature control, fast stabilization speed. Strong anti-interference. The main control chassis is composed of subsystems such as low-thermal-EMF scanner/controller and temperature control instrument. It uses Shimaden temperature controller for temperature control, with ten-segment PID adjustment, fast temperature control speed, and stable temperature control.

2) It has self-tuning and adaptive temperature control functions, no need to manually adjust temperature control parameters. Turning on the self-tuning function can automatically match optimized temperature control parameters.

3) Japan-imported low-thermal-EMF silver-plated scanning switch, with small and stable parasitic EMF; the silver-plated scanning switch is in a sealed environment and is not easily oxidized.

4) It uses imported silicon-controlled rectifier (SCR) and adopts phase-shift triggering method, with stable temperature control and strong anti-interference; (some manufacturers use zero-crossing triggering temperature control method, where the voltage applied to the equipment during heating is 0,220V, phase-shift triggering is0-220V a smooth transition between

5) The module power input and output use waterproof plugs to avoid exposed wiring terminals,

6) All measurement wires connected to the scanning switch are tin-plated to reduce contact potential caused by connections.

7) Rear panel: Power input and output use Weipu plugs to avoid exposed power supply

4. Main system features

1) The whole machine introduces advanced foreign technology, and the product is matched with high-configuration imported components and chips: imported low-thermal-EMF silver-plated scanning switches; imported thyristors with strong anti-interference; data transmission is more reliable and stable.

2) Intuitive display and easy operation: fully runs under the computer operating platform, with mouse click operation. It conforms to Windows operating habits, with window interface and pull-down menus. Use the mouse to select input parameters and perform process operations. It is powerful, convenient, flexible, and fast. During the verification process, the display real-time shows the temperature change curve of the verification furnace (or oil bath, water bath, etc.), the temperature of the verification furnace (oil bath, water bath), the verification point temperature, the verification process, the cold end temperature, the millivolt value of the temperature control thermocouple (the resistance value of the temperature control thermal resistance), and the verification time.

3) Complete functions and flexible configuration: can verify various indexing numbers of base metal thermocouples and precious metal thermocouples as well as various indexing numbers of thermal resistances; can verify two-wire (four-wire) and three-wire thermal resistances; has multiple cold junction compensation methods, providing zero point, input room temperature, and automatic cold junction tracking compensation for operator selection; making verification results more accurate; has manual/automatic switching function, providing operation means under special circumstances.

4) High precision and high resolution: equipped with original computer and imported six-and-a-half-digit, seven-and-a-half-digit, eight-and-a-half-digit digital multimeters, with accuracy reaching0.005%. The data transmission between the meter and computer is reliable, data processing speed is fast, and the interface is clear and easy to understand.

5) High degree of automation, high degree of standardization, and short verification time: the verification process continuously and automatically controls temperature, automatically verifies, automatically processes data, and automatically prints various verification records and certificates. The verification process, data processing, verification records, and certificates for thermocouples and thermal resistances fully comply with national metrological verification regulations.JJF1637-2017; Requirements of JJG-229-2010 regulation and the 90 temperature scale implementation manual.

6) With system certification test function: The system is equipped with a certification test module for the thermocouple and thermal resistance calibration device itself, which can automatically test the total uncertainty, repeatability error of the device for calibrating thermocouples and thermal resistances, as well as the temperature field of the calibration furnace and oil bath, and print out certification reports. This brings great convenience to operators for system standard establishment and system review.

7) The system technology is mature, advanced, and highly reliable: The product is strictly manufactured according to regulations. All parts and the whole machine must pass environmental (temperature and humidity) and mechanical (vibration) test screening. Before leaving the factory, burn-in and periodic debugging are carried out to ensure product reliability and stability.

8) Complete protection measures: Equipped with a system self-check program, which can self-check the digital meter, main control box, temperature controller, special interface card, and wire connections. When over-temperature, broken thermocouple, or short circuit of the thermocouple occurs, the system will automatically turn off the thyristor power regulator, cut off the heating current, and prompt an alarm. When the main control box or computer crashes, the system will also automatically turn off the thyristor power regulator and cut off the heating current.

9) Possess continuation inspection function: when power outage, crash, or mid-way exit occurs, reopening the software can continue the inspection from where it was not completed last time.

10) Temperature control mode selectable: standard couple temperature control and control couple temperature control

5. Standards met

The inspection program of this system is strictly written and implemented according to relevant national inspection regulations and executes the ITS-90 international temperature scale, meeting relevant standards and regulations including:

JJG 141-2000 "Working Precious Metal Thermocouple";

JJG 351-1996 "Working Base Metal Thermocouple";

JJG 229-2010 "Industrial Platinum and Copper Resistance Thermometer";

JJG 130-2004 "Working Glass Liquid Thermometer";

JJG 978-2003 "High-Precision Glass Mercury Thermometers for Petroleum Use";

JJG 310-2002 "Pressure-Type Thermometers";

JJG 226-2001 "Bimetallic Thermometers";

JJG115-1999"Standard Copper-Copper Nickel Thermocouple"

JJG 75-1995 "Standard Platinum Rhodium 10-Platinum Thermocouple";

JJG 368-2000 "Working Copper-Copper Nickel Thermocouple";

JJF1098-2013"Calibration Specification for Automatic Measurement Systems of Thermocouples and Thermal Resistances".

JJF1637-2017"Calibration Specification for Base Metal Thermocouples"

JJF 1262-2010 Calibration Specification for Sheathed Thermocouples

6. Equipment operating conditions:

1) Ambient temperature:20℃±5℃；

2) Relative humidity:≤75% RH；

3) Use power supplyAC220V±10% 50±1HZ；

4) Ground resistance required to be ≤4Ω;

5) There should be no high-concentration dust and corrosive gases in the surrounding area; it cannot be used or stored in flammable or explosive atmospheres, and certain ventilation conditions should be provided.

7. Standard configuration scheme

This is a recommended configuration solution; users can select options based on actual needs.