Keywords: measurement system, temperature, differentiator, time, high frequency, filtering, voltage, recording instrument, cooling rate, sensitivity,

table  Technical requirements for each component of the measuring and setting system
　　name technical requirements
　　(1) should be able to receive a minimum input of 20mV/s
　　(2) when inputting 20mV/s, the output should not be less than 10OmV, and the temperature differentiator coefficient of the time constant should not be greater than±100x10-6/℃
　　(3) shall be equipped with a high-frequency filter device with a time constant of not more than 0.1s
　　(4) the drift of the output voltage shall not exceed 1% of the full scale within the range of 15min
　　recording instrument
　　(1) a X-Y recorder that records the functional relationship between cooling speed and temperature the following minimum criteria shall be met
　　① Sensitivity. Temperature: 0.2mV/mm
　　Speed: 5mV/s or 10mV/s or 20mV/s shall account for 250mm
　　② Linearity. Not less than 0.1%
　　③ Repeatability. Not less than 0.5%
　　④ recording speed, minimum 200 mm/s
　　(2) a Y-t recorder that records the functional relationship between temperature and time shall meet the following minimum index
　　① sensitivity. Not less than 0.2mV/mm
　　② Linearity. Not less than 0.1%
　　③ Accuracy. Not less than 0.5%
　　④ Recording speed. Minimum 200 mm/s
　　⑤ Curve speed accuracy. 1%
　　⑥ The instrument should be equipped with an event recorder to record the moment when the probe touches the quenching oil
　　(3) A two-stroke or two-stroke Y-t recorder can be used as an alternative System use. The recorder should have the above functions and accuracy

More Technical requirements for each component of the measuring and setting system: www.quenchtank.com/view-321.html