There are measuring blocks, weights, pressure gauges, flow meters, ammeters and so on.
1, block
Block is a standard end gauge without scale. The manufacturing material for special alloy steel, rectangular in shape, six planes in two parallel to each other, extremely smooth and flat measuring surface;
The two measuring surfaces have precise working dimensions between the block, the block is mainly used as a size transfer system in the middle of the standard gauge, or in the relative method of measurement as a standard for adjusting the zero position of the instrument, but also can be used to measure the parts directly.
The gauge block is a high-precision gauge that determines its working length by the distance between two mutually parallel measuring surfaces, and its length is the length standard of the measuring instruments. By means of calibration of measuring instruments, gauges and measuring gauges, etc., the dimensions of the various manufactured products in the machining process can be traced back to the length reference.
According to the provisions of JJG2056-90 "Length Measuring Apparatus (Measurement Block Part) Checking System", the measurement block is divided into 1, 2, 3, 4, 5, 6, etc. and 00, 0, K, 1, 2, 3 levels. Measurement blocks have been implemented in the export product quality licensing system, without obtaining an export quality license products are not allowed to export.
2, weights
Weights are the quality of the value of the transfer of standardized gauges. The quality of the value of the International Bureau of Weights and Measures in France to save the platinum-iridium alloy kilograms of the original in kind as the only reference.
Countries will be divided into weights of the national kilogram benchmark, national kilogram sub-benchmark, kilograms of work benchmarks, as well as by the kilograms of the multiples and fractions of the composition of the work of the benchmark group and the work of the standard weights.
3, pressure gauge
Pressure gauge (English name: pressure gauge) refers to the elastic element as a sensitive element, measuring and indicating higher than the ambient pressure of the instrument, the application of the extremely common, it is almost all over the industrial process and scientific research areas.
In the heat pipe network, oil and gas transmission, water supply and gas supply system, vehicle maintenance store and other fields can be found everywhere. Especially in the industrial process control and technical measurement process, due to the mechanical pressure gauge of the elastic sensitive element has a high mechanical strength and production convenience and other characteristics, so that the mechanical pressure gauge is more and more widely used.
4, flowmeter
Flowmeter English name is flowmeter, the National Science and Technology Nomenclature Review Committee defined it as: indication of the measured flow rate and/or the total amount of fluid in the selected time interval instrument. Simply put, it is used to measure the flow of fluid in the pipeline or nullah in a meter.
Flowmeter is divided into differential pressure flowmeter, rotor flowmeter, throttling flowmeter, slit flowmeter, volumetric flowmeter, electromagnetic flowmeter, ultrasonic flowmeter and so on. Classification by medium: liquid flowmeter and gas flowmeter.
5, ammeter
Ammeter is used to measure the current in the alternating and direct current circuit instrumentation. In the circuit diagram, the ammeter symbol for "circle A". The current value is standardized in "A" or "A".
The ammeter is made according to the effect of magnetic force on an energized conductor in a magnetic field. Inside the ammeter there is a permanent magnet, which generates a magnetic field between the poles, and in the magnetic field there is a coil, with a spring at each end of the coil, and the springs are each connected to a terminal of the ammeter;
The spring is connected to the coil by a rotating shaft, and there is a pointer in the shaft relative to the front end of the ammeter. When there is a current through, the current along the spring, the spindle through the magnetic field, the current tangent magnetic induction, so by the magnetic field force, so that the coil deflection, driven by the spindle, pointer deflection.
Baidu Encyclopedia - Compulsory Inspection of Measuring Instruments
Baidu Encyclopedia - Measuring Instruments