بدضعیفمتوسطخوبعالی (بدون رتبه)


Ohmmeter: A device used to measure electrical resistance.

One-to-one repeater: A diaphragm-operated device which detects process pressure and generates an air (or nitrogen) output signal of equal pressure.

Optical isolation: Two networks or circuits in which an LED transmitter and receiver are used to maintain electrical discontinuity between the circuits.

Output settling time: The time required for an analog output voltage to reach its final value within specified limits.

Output signal: A signal delivered by a device, element or system.

Output slew rate: The maximum rate of change of analog output voltage from one level to another.

Overtravel: That part of a stroke which falls between the end of the calibrated range and the travel stop.


Phase: A time-based relationship between a periodic function and a reference.

Phase shift: The angle in degrees between an energizing voltage waveform and an output signal waveform.

Polarity: In electricity, the quality of having two charged poles, one positive and one negative.

Port: A communications connection on an electronic or computer-based device.

Power supply: A separate unit or part of a system that provides power (pneumatic, electric, etc.) to the rest of a system.

Pressure, ambient: The pressure of the medium surrounding a device.

Pressure, design: The pressure used in the design of a vessel or other item of equipment for the purpose of determining the minimum permissible wall thickness or size of parts for a given maximum working pressure (MWP) at a given temperature.

Pressure, maximum working: The maximum permissible operating pressure at a specified temperature. This is the highest pressure to which the device will be subjected during regular use.

Pressure, operating: The actual (positive or negative) pressure at which a device operates under normal conditions.

Pressure, rupture: The burst pressure of a device (determined by testing).

Pressure, static: The steady-state pressure applied to a device.

Pressure, supply: The pressure at which a utility (such as air) is supplied to a device.

Pressure, surge: Operating pressure plus the increment to which a device can be subjected for a very short time during temporary pressure surges caused by such phenomena as pump start-up or valve shut-off.

Pretravel: That part of a stroke which falls below the calibrated range, between zero and the travel stop.

Primary element: An element that converts a measured variable into a force, motion or other form suitable for measurement.

Process: Physical or chemical change of matter or conversion of energy.

Process measurement: The acquisition of information that establishes the magnitude of process quantities.

Programmable logic controller (PLC): Computer-based industrial monitoring and control package with applications mostly in the areas of safety, sequential or logical operations, where control actions are based on equipment and alarm status.

Proportional control: A control mode which generates an output correction in proportion to error (the process variable’s deviation from setpoint).

Proportional-integral-derivative (PID): Also referred to as a 3-mode controller, combining proportional, integral, and derivative control actions.

psia: Pounds per square inch absolute; the unit of pressure used when the zero reference is full vacuum.

psig: Pounds per square inch gauge; the unit of pressure used when the zero reference is the barometric pressure of the atmosphere.

نوشته های مرتبط

دیدگاهتان را بنویسید

نشانی ایمیل شما منتشر نخواهد شد. بخش‌های موردنیاز علامت‌گذاری شده‌اند *