Post Tagged with: "measurement"

Filling material level measurement.

Filling material level measurement.

Basic, Instrumentations 23 Tháng Sáu, 2014 at 5:57 chiều

The “classical approach” to measuring the filling level With ball mills this working point is linked directly to the level of the material being ground in the mill. A mill that is too empty, i.e. one that has been underfed, operates extremely uneconomically from the energy point of view while a mill that is too full, i.e. has been overfed,Read More

Ultrasonic Level Measurement

Ultrasonic Level Measurement

Basic, Instrumentations 23 Tháng Sáu, 2014 at 5:53 chiều

Ultrasonic level instruments operate on the basic principle of using sound waves to determine liquid/ solid/slurries level. In addition to standard level or volume measurement, they can monitor open channel flow, determine the actual volumetric throughput in lift stations, measure differential level and control the pumps. Ultrasonic Level Transmitters consist of two elements; 1) a high efficiency transducer and, 2)Read More

Pitot Tube Flow Detectors

Pitot Tube Flow Detectors

Basic, Instrumentations 23 Tháng Sáu, 2014 at 5:50 chiều

The pitot tube, illustrated in Figure 5, is another primary flow element used to produce a differential pressure for flow detection. In its simplest form, it consists of a tube with an opening at the end. The small hole in the end is positioned such that it faces the flowing fluid. The velocity of the fluid at the opening ofRead More

Venturi & Dall Tube Flow Detectors

Venturi & Dall Tube Flow Detectors

Basic, Instrumentations 23 Tháng Sáu, 2014 at 5:46 chiều

HEAD FLOW METERS Flow measurement is an important process measurement to be considered in operating a facility’s fluid systems. For efficient and economic operation of these fluid systems, flow measurement is necessary. Head flow meters operate on the principle of placing a restriction in the line to cause a differential pressure head. The differential pressure, which is caused by theRead More

Orifice Plate Flow Detectors

Orifice Plate Flow Detectors

Basic, Instrumentations 23 Tháng Sáu, 2014 at 5:43 chiều

HEAD FLOW METERS Flow measurement is an important process measurement to be considered in operating a facility’s fluid systems. For efficient and economic operation of these fluid systems, flow measurement is necessary. Head flow meters operate on the principle of placing a restriction in the line to cause a differential pressure head. The differential pressure, which is caused by theRead More

Differential Pressure Level Detectors

Differential Pressure Level Detectors

Basic, Instrumentations 23 Tháng Sáu, 2014 at 5:13 chiều

The differential pressure (ΔP) detector method of liquid level measurement uses a ΔP detector connected to the bottom of the tank being monitored. The higher pressure, caused by the fluid in the tank, is compared to a lower reference pressure (usually atmospheric). This comparison takes place in the ΔP detector. Figure 9 illustrates a typical differential pressure detector attached toRead More

Float Level Detector

Float Level Detector

Basic, Instrumentations 23 Tháng Sáu, 2014 at 5:08 chiều

Ball Float The ball float method is a direct reading liquid level mechanism. The most practical design for the float is a hollow metal ball or sphere. However, there are no restrictions to the size, shape, or material used. The design consists of a ball float attached to a rod, which in turn is connected to a rotating shaft whichRead More

Bourdon Tube-Type Pressure Detectors

Bourdon Tube-Type Pressure Detectors

Basic, Instrumentations 12 Tháng Sáu, 2014 at 1:01 chiều

The bourdon tube pressure instrument is one of the oldest pressure sensing instruments in use today. The bourdon tube (refer to Figure 2) consists of a thin-walled tube that is flattened diametrically on opposite sides to produce a cross-sectional area elliptical in shape, having two long flat sides and two short round sides. The tube is bent lengthwise into anRead More

Bellows-Type Pressure Detectors

Bellows-Type Pressure Detectors

Basic, Instrumentations 10 Tháng Sáu, 2014 at 8:35 chiều

The need for a pressure sensing element that was extremely sensitive to low pressures and provided power for activating recording and indicating mechanisms resulted in the development of the metallic bellows pressure sensing element. The metallic bellows is most accurate when measuring pressures from 0.5 to 75 psig. However, when used in conjunction with a heavy range spring, some bellowsRead More