First, the main content of the temperature sensor included in the AMS2750D "High Temperature Measurement" specification
(1) The AMS2750D "High Temperature Measurement" specification has general requirements for temperature sensors, including the following: requirements and requirements for temperature sensor certification, and the requirements and requirements for conversion between degrees 毫-millivolts, Specification and requirements for temperature sensor calibration, regulations and requirements for temperature sensor use, provisions and requirements for compensation wires for temperature sensors, regulations and requirements for verification of wire coils for temperature sensor wires, and temperature sensor wires Regulations and requirements for the maximum allowable length of the wire coil, the requirements and requirements for the repeated use of the K-type and E-type temperature sensors as the secondary standard or system accuracy check temperature sensor, and the requirements and requirements for repeated use of the temperature sensor. The "U" formula for the low-cost metal test temperature sensor and the requirements and requirements for recalibration of the test temperature sensor.
(2) Regulations and requirements for reference standard sensors.
(3) Regulations and requirements for Class 1 standard sensors.
(4) Regulations and requirements for secondary standard sensors.
(5) Specification and requirements for temperature uniformity test sensors.
(6) Regulations and requirements for system accuracy verification sensors.
(7) Regulations and requirements for the control, monitoring, and recording of sensors.
(8) Regulations and requirements for load cells.
Second, the general requirements for temperature sensors in the AMS2750D "High Temperature Measurement" specification
1. General requirements
The temperature sensor should meet the requirements of Table 1. Temperature sensors for special applications should be implemented in accordance with the relevant regulations.
The temperature sensor specified in the AMS2750D High Temperature Measurement specification or other temperature sensor with the same or better accuracy (maximum allowable error) should be used to measure the temperature.
The temperature sensor can be made of a bare wire or a coated wire, or it can be made of a MIMS (ceramic insulating sheath, metal sheath + insulating material) coated wire.
The calibration method shall be performed in accordance with ASTM E 220, ASTM E 207 or other national standards.
The correction value (correction factor) obtained by the initial or subsequent calibration of the temperature sensor can be used to improve the accuracy of the temperature (corrected temperature accuracy) and is used when required by the AMS2750D "High Temperature Measurement" specification.
2. Analysis and discussion
In order to obtain temperature or continuously measure a temperature change, proper selection and maintenance of the temperature sensor (thermocouple) is the basic guarantee for the success of the process control. The form and function of the temperature sensor is simple, but it needs to be carefully selected and used to get the best results and accuracy. If you want to choose the right temperature sensor, you must be clear about its purpose and ensure that the type of sensor selected matches its purpose.
The following factors will directly affect the success of the temperature sensor: the purity of the sensing material, the quality of the temperature sensor, the temperature used, the period of use, the chemical environment used, the method of protection, and the possibility of abuse of the temperature sensor.
If you want to choose the temperature sensor correctly, you must consider the following questions: What is the highest and lowest temperature of the temperature sensor operation; what is the atmosphere (environment) of the furnace (equipment); what are the requirements of the process specification; what is the maximum allowable error? How long does the expected test process take; how long the life of the temperature sensor is expected; whether there is a cost limit in the test process; whether the user has the correct management of the temperature sensor.
Note: (1) Temperature and temperature sensors with the same accuracy or higher precision (maximum allowable error) are allowed.
(2) The percentage of reading or the correction value in degrees, whichever is greater.
(3) T-type temperature sensor is usually used for temperatures below 0 °C, tolerance (maximum allowable error) is: ± 0.6 ° C or ± 0.8% of reading, whichever is greater.
(4) The requirements for recalibration are clearly defined in the corresponding sections of the AMS2750D High Temperature Measurement specification.
(5) The reference standard temperature sensor can be used to verify any low level temperature sensor.
(6) NIST or equivalent national standards.
(7) The verification requirements for exceptions are clearly defined in the corresponding sections of the AMS 2750D High Temperature Measurement specification.
(8) The requirements for consumable and inexpensive metal temperature sensors and durable metal temperature sensors are carried out in the corresponding chapters of the AMS2750D "High Temperature Measurement" specification.
Clear regulations.
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