|
US$619.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJF 1049-2024: Calibration Specification for Temperature Sensors'' Dynamic Response
Status: Valid JJF 1049: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| JJF 1049-2024 | English | 619 |
Add to Cart
|
5 days [Need to translate]
|
Calibration Specification for Temperature Sensors'' Dynamic Response
| Valid |
JJF 1049-2024
|
| JJF 1049-1995 | English | 349 |
Add to Cart
|
3 days [Need to translate]
|
Calibration Specification of Temperature SensorDynamic Response
| |
JJF 1049-1995
|
Basic data | Standard ID | JJF 1049-2024 (JJF1049-2024) | | Description (Translated English) | Calibration Specification for Temperature Sensors'' Dynamic Response | | Sector / Industry | Metrology & Measurement Industry Standard | | Word Count Estimation | 30,390 | | Date of Issue | 2024-09-18 | | Date of Implementation | 2025-03-18 | | Issuing agency(ies) | State Administration for Market Regulation | JJF 1049-2024: Calibration Specification for Temperature Sensors'' Dynamic Response---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Metrology Technical Specifications of the People's Republic of China
Temperature Sensor Dynamic Response Calibration Specifications
Released on 2024-09-18
2025-03-18 Implementation
The State Administration for Market Regulation issued
Temperature Sensor Dynamic Response Calibration Specifications
Sensors' Dynamic Response
Replace JJF 1049-1995
Responsible unit. National Temperature Measurement Technical Committee
Main drafting unit. China Aviation Industry Corporation Beijing Great Wall Metrology and Testing Technology
graduate School
Shanghai Instrument and Automation System Inspection and Testing Institute Co., Ltd.
Participating in the drafting. China Institute of Metrology
Shenyang Dongda Sensing Technology Co., Ltd.
This specification is entrusted to the National Temperature Metrology Technical Committee for interpretation
The main drafters of this specification are.
Zhao Jian (Beijing Great Wall Metrology and Testing Technology Co., Ltd., Aviation Industry Corporation of China
graduate School)
Hu Lintao (Beijing Great Wall Metrology and Testing Technology Co., Ltd., Aviation Industry Corporation of China
graduate School)
Guo Aihua (Shanghai Instrument and Automation System Inspection and Testing Institute Co., Ltd.)
Participating drafters.
Liao Li (Beijing Great Wall Metrology and Testing Technology Co., Ltd., Aviation Industry Corporation of China
graduate School)
Zheng Wei (China National Institute of Metrology)
Wang Kuihan (Shenyang Dongda Sensing Technology Co., Ltd.)
Table of contents
Introduction (II)
1 Scope(1)
2 References(1)
3 Terms and definitions (1)
4 Overview(1)
4.1 Structure and Principle (1)
4.2 Purpose(2)
5 Metering characteristics (2)
6 Calibration conditions(2)
6.1 Laboratory Environmental Conditions (2)
6.2 Measurement standards and other equipment (2)
7 Calibration items and calibration methods (5)
7.1 Calibration Items(5)
7.2 Calibration method (5)
8 Expression of calibration results (9)
9 Recalibration interval (10)
Appendix A Thermal Response Time Calculation by Graphical Method (11)
Appendix B Evaluation of measurement uncertainty of calibration results (13)
Appendix C Original Record of Calibration Results (23)
Appendix D Calibration Certificate Format (24)
Introduction
JJF 1071 "Rules for the Preparation of National Metrology and Calibration Specifications", JJF 1001 "General Metrology Terms and Definitions" and
JJF 1059.1 "Evaluation and Expression of Uncertainty in Measurement" together constitute the basic series supporting the preparation of this specification
specification.
This specification replaces JJF 1049-1995 "Temperature Sensor Dynamic Response Calibration Specification".
Compared with the previous version, in addition to editorial changes, the main technical changes of this specification are as follows.
--- Added a calibration method using laser as dynamic temperature excitation source;
--- Modified the water flow environment to liquid flow environment (see 6.2.1);
--- Added measurement uncertainty assessment content (see Appendix B).
The previous versions of this specification are as follows.
---JJF 1049-1995.
Temperature Sensor Dynamic Response Calibration Specifications
1 Scope
This specification applies to contact temperature sensors with a time constant of not less than 1ms at room temperature ~ 1700℃ and air flow
Dynamic response (thermal response time) calibration for Mach numbers below 0.95 or liquid flow rates below 1m/s, temperature sensors
Mainly includes thermocouples and thermal resistance temperature sensors.
2 References
This specification has no referenced documents.
3 Terms and definitions
3.1 Thermal response time
When the temperature changes step by step, the output of the temperature sensor changes to a certain value equivalent to the temperature step.
The time required to change to 10%, 50%, and 90% of the temperature step amount, respectively.
Denoted as τ0.1, τ0.5, and τ0.9.
3.2 Time constant
The thermal response time for the output of the temperature sensor to change to 63.2% of the temperature step. The symbol is τ.
3.3 Temperature step temperaturestep
The difference between the steady-state temperature after a temperature step change and the previous steady-state temperature.
A system or device used to produce a change in temperature.
3.5 Ejection mechanism
A mechanism that uses mechanical means to complete ejection and ultimately achieve a temperature step change.
A device that generates lasers of different amplitudes and pulse widths to achieve temperature step (or pulse) changes.
The temperature at which a gas flow comes to a state of adiabatically isentropic stagnation with a velocity of zero.
The pressure at which a gas flow comes to a state of adiabatically isentropic stagnation with zero velocity.
4 Overview
4.1 Structure and Principle
A temperature sensor usually consists of a sensitive element, a housing, leads, etc. The typical structural diagram is shown in Figure 1.
Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of JJF 1049-2024_English be delivered?Answer: Upon your order, we will start to translate JJF 1049-2024_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time. Question 2: Can I share the purchased PDF of JJF 1049-2024_English with my colleagues?Answer: Yes. The purchased PDF of JJF 1049-2024_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. If you need your currency to be printed on the invoice, please write an email to [email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay. Question 5: Should I purchase the latest version JJF 1049-2024?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJF 1049-2024 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.
|