Foxboro flowmeter

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1. Instrument Exercise

Empty: 1. In the thermocouple temperature measurement circuit, as long as the temperature at both ends of the instrument and the connecting wire is the same, the thermocouple (total potential value) will not change due to their connection. This is a conclusion drawn based on the law of (intermediate conductor). The conditions for a thermocouple to generate thermoelectric potential are (different materials of the two hot electrodes) and (different temperatures at the two junctions). In the three thermocouples with scale marks S, K, and E, the potentials at 100 ℃ are (0.645mv), (4.095mv), and (6.317mv), respectively. When measuring temperature with a thermocouple, the connecting wire should use a compensating wire. 5. The compensating wire is an extension of the thermocouple, but the compensation for the cold end of the thermocouple must be considered. 6. An elastic pressure gauge operates based on the principle that the deformation of the elastic element is proportional to the applied pressure. 7. Commonly used elastic pressure gauges include diaphragm type, bellows type, and spring tube type. 8. The diaphragm pressure gauge mainly consists of (measurement system), (transmission system), (indication system), and (case connector) parts. 9. Precision pressure gauges have high accuracy levels, generally including (0.6), (0.4), and (0.25) levels. 10. The electric contact pressure gauge can emit an alarm signal when the pressure is below the lower limit or above the upper limit. 11. Piston pressure gauges are generally divided into two types: single piston and double piston, and their working principle is (static pressure balance). The weight mark on the piston pressure gauge is (pressure). 13

. Gas pressure transmitters can be divided into two categories, namely pressure transmitters constructed based on the principle of displacement balance and pressure transmitters constructed based on the principle of force balance. 14.1 kilogram force=(9.8) Newton 1MPa=(10 × 6) Pa15. The volume of fluid flowing through a unit of time is called (volumetric flow rate), represented by (Q). The density of gas decreases with increasing temperature and increases with increasing pressure. 17. Pneumatic differential pressure transmitters generally operate based on the principle of torque balance. The pneumatic differential pressure transmitter consists of two parts in structure: (measurement) and (force air conversion). The diaphragm box of the differential pressure transmitter is filled with silicone oil, which not only transmits pressure, but also has a damping effect, so the instrument output is stable. 20. The glass level gauge works based on the principle of (connector). 21. Static pressure level gauges work based on the principle of fluid (static pressure) equilibrium. 22. The model of the flange type differential pressure transmitter is marked with "A" to indicate (positive) migration, and with "B" to indicate (negative) migration. 23. The float type liquid level gauge measures liquid level based on the Archimedes principle. 24. The float level gauge is based on the principle of constant buoyancy. If a resistor of 10 is loaded with 220VAC voltage, the theoretical current flowing through this resistor should be (22A). Due to the different impurities added to semiconductors, impurity containing semiconductors can be divided into two categories: (N) type semiconductors and (P) type semiconductors. The characteristics of a PN

1. Instrument Exercise

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