The quality of the measuring instrument can be reflected by its accuracy, reproducibility, sensitivity, response time, zero drift, and range drift.
(1) Accuracy: Also called accuracy, that is, the accuracy of the instrument's measurement results close to the real value. Can be expressed as absolute error or relative error:
1 Absolute error = measured value - real value 2 Relative error = absolute error / true value Any instrument cannot measure the true value of the measured parameter absolutely and accurately, only the ability to make the measured value close to the true value. In practical applications, only the indicator value of the standard meter with higher accuracy is used as the actual value of the measured parameter, and the difference between the indication value of the measurement instrument and the indication value of the standard meter is the measurement error. The smaller the error value, the higher the reliability of the measuring instrument.
(2) Response time: When the measured parameter changes, the measured value indicated by the meter will always be accurately expressed after a period of time. The time when the measured parameter changes and the time delay is the reaction time of the instrument. Some use the time constant (such as thermal resistance temperature measurement), and some use the damping time (such as the current meter resistance measurement).
(3) Sensitivity: The degree of sensitivity of the meter . The ratio of the change in the output of a common instrument to the change in the measured parameter that caused the change.
(4) Zero drift and span drift: refers to the percentage of the average change value with respect to the range after multiple measurements of the relative zero point and maximum range confirmed by the instrument.
(5) Reproducibility: refers to the percentage of the difference between the measured value and the average value with respect to the maximum scale range when the same meter is used to repeatedly measure a certain parameter when the measurement condition is not changed. This is an important indicator of the stability of instruments and meters. It is generally required to carry out inspections at the time of commissioning and daily verification.
Changzhou Chengfeng flow meter is in the industry for 30 years. Chengfeng flowmeter has a footprint all over the country. The sales volume of glass rotor flowmeter flowmeter accounts for one-fifth of the country's sales volume. Such achievement is firstly the quality of Hefeng Fenghe flowmeter. Inextricable, but also inseparable from the service, in fact, it is very important to be inseparable from technological innovation, and the ability of the client to deal with the issue of the problem, a product from the selection to the production to use to the end of the end of life, in the middle or Or there will be some problems. How to solve these problems requires perfect pre-sale service, after-sales service and technical service. The pre-sales service includes the introduction and selection of our products. At this time, Chengfeng flowmeters must first understand the customer's situation, give them the best solution targeted, the most suitable product, and the right one is the best. Flowmeter problems can be directly found Chengfeng instrument.
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