Pressure instruments are used to measure, monitor, record, transmit or control pressure. There are several types of devices. Recorders are used to measure values or accumulate totals. Controllers are used to regulate positive or negative (vacuum) pressure. They receive sensor inputs, provide control functions, and output control signals. Complete pressure instruments are self-contained devices that provide an output such as a display. Analog meters use a simple visual indicator such as a needle. Digital displays present numeric or application-specific values. Cathode ray tubes (CRT), liquid crystal displays (LCD), and other multi-line displays are also available. Some pressure instruments are suitable for measuring the pressure of liquids or gases. Others are rated for hazardous duty. Import specifications to consider include working pressure range, accuracy, vacuum range, and operating temperature. Temperature outputs, temperature compensation, negative pressure outputs, alarm indicators, and transistor-transistor logic (TTL) switches are commonly available.
Pressure instruments use many different sensing technologies. Mechanical deflection devices such as diaphragms, Bourdon tubes or bellows consist of an elastic or flexible element that is deflected mechanically by a change in pressure. Sealed pistons or cylinders are also available. Strain gauges are bonded to a larger structure that deforms as pressure changes. Piezoresistive devices sense shifts of electrical charges within a resistor. Piezoelectric pressure instruments measure dynamic and quasi-static pressures. Their common modes of operation are charge mode, which generates a high-impedance charge output; and voltage mode, which uses an amplifier to convert the high-impedance charge into a low-impedance output voltage. Thin film devices consist of an extremely thin layer of material, usually titanium nitride or polysilicon, deposited on a substrate. Pressure instruments that use microelectromechanical systems (MEMS), variable capacitance, and vibrating elements are commonly available.
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