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The DP-cell will indicate the relative difference between the pressure of the vessel (container) and the atmospheric pressure. This signal is often wired to an indicator that reads out locally, or remotely in a control room, and/or as a control (or feedback) signal to a valve, pump, or other control element to maintain a set pressure, or limit ...
The level measurement can be either continuous or point values. Continuous level sensors measure level within a specified range and determine the exact amount of substance in a certain place, while point-level sensors only indicate whether the substance is above or below the sensing point.
Diagram of the level instrumentation on a process vessel. The level measurement of liquids in pressure vessels and tanks in the petrochemical industry is undertaken by differential pressure level meters, radar, magnetostrictive, nucleonic, magnetic float and pneumatic bubbler instruments. [1] [9]
In the case of a DP flowmeter, size the primary element for a higher or lower differential pressure (higher DP's provide higher accuracy, at the expense of higher pressure loss). Select a flowmeter and pressure transmitter with faster or slower response. Use long or short interconnection (impulse) lines, or direct connect for fastest response.
A Precision Measurement Equipment Laboratory (PMEL) is a United States Air Force (USAF) facility in which the calibration and repair of test equipment takes place. This practice is also known as metrology: the science of measurement. Metrology is defined as the science of weights & measures, while a PMEL is the place where technicians perform ...
The formal definition of calibration by the International Bureau of Weights and Measures (BIPM) is the following: "Operation that, under specified conditions, in a first step, establishes a relation between the quantity values with measurement uncertainties provided by measurement standards and corresponding indications with associated measurement uncertainties (of the calibrated instrument or ...
IEC 62150 Fibre optic active components and devices – Test and measurement procedures; IEC 62151 Safety of equipment electrically connected to a telecommunication network; IEC TR 62152 Transmission properties of cascaded two-ports or quadripols – Background of terms and definitions; IEC 62153 Metallic communication cables test methods
P-Code GPS precision code PCN pavement classification number: PD Profile descent PDA performance degradation allowance: PDAS public domain aeronautical software PDC Pre-Departure Clearance PDG procedure design gradient: PDM pilot decision making: PDOP Position dilution of precision PDU power drive unit Flap actuation PET point of equal time PESA