Instruments & Measurement

Figure 1: Bellows Pressure Gauge. Working and Construction of Bellows Pressure Gauge The bellows pressuree gauges are used for the measurement of absolute pressure. It is more sensitive than Bourdon tube gauges. It is generally used for the range down to 155.1 mm Hg (3 psi). It may be used for even lower pressures upto […]

Figure 1: Float Level Sensor. Working and Construction of Float Level Sensor The float type level indicator is shown in Fig. 1. A float rests on the surface of liquid and follows the changing level of liquid. The movement of the float is transmitted to the pointer by a stainless steel or phosphor-bronze flexible cable

Diaphragms are widely used for pressure measurements particularly in a very low ranges (0 to 4 mmHg). They can be flat, corrugated or dished plates and the choice depends on the strength and amount of deflection desired.

Figure 1: Bourdon Tube Pressure Gauge. Working and Construction of Bourdon Tube Pressure Gauge The Bourdon tube is the most frequently used pressure gauge because of its simplicity and rugged construction. It covers ranges from 0-15 psig to 0-100,000 psig, as well as vacua from 0 to 30 inches of mercury. It consists of a

Figure 1: Capacitance Level Sensor.

The eddy current tachometer converts the angular speed (ω) of the rotor into pointer deflection ϕ. The diagram of the eddy current type tachometer is shown in figure 1. The eddy current tachometer is also referred as drag-up tachometer.