Measuring Instrument

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Measuring Instrument


a device that makes possible direct reading of values of a quantity being measured.

In analog instruments the readout is from a scale; in digital instruments, from a digital reading device. Indicating instruments are intended only for visual readings, whereas recording instruments are equipped with a device for recording the readings, mainly on paper. Recording instruments are subdivided into automatic types, which produce a record of readings in the form of a diagram, and printing types, which provide readings in digital form. In direct-action instruments (such as a manometer or ammeter), one or more conversions of the measured quantity are performed and its value is found without comparison with a known like quantity. In comparison instruments the quantity being measured is compared directly with a like quantity reproduced by a standard (examples are an equal-arm balance, an electric potentiometer, and a comparator for linear measures). Integrating instruments (electric or gas meters), in which the quantity is integrated in time or with respect to another independent variable, and summation instruments, which provide the value of two or more quantities fed through different channels (wattmeters, which total the power of several electrical generators), are among the varieties of measuring instruments.

To automate the control of industrial processes, measuring instruments are often equipped with additional recording, calculating, and control devices that function according to predetermined programs.


References in periodicals archive ?
As the square-section shaft rotated, the nut on the shaft causing the gate connected to it to move forward and backward, which, in turn, opened and closed the gate of metering device. This procedure allowed to simultaneously changing the position of gates.
It is strongly recommended that maintenance technicians measure and adjust superheat to the manufacturer's specifications for equipment with a fixed orifice metering device, or subcooling for equipment with a thermal expansion valve (TXV).
The metering device is controlled by a proprietary hardware key which fits into the printer port of the PC.
In this study, first two types of fertilizer metering device control systems were separately mounted on a fertilizer applicator (Tarashkadeh Company), and then their accuracies were evaluated.
The design features clamp joints and clamped flange connections at the feed hoppers and the material conduits to the metering devices and the silos that can be loosened without tools.
The adhesive supply to the metering device is isolated from the application point and eliminates the requirement of exact metering from the adhesive supply unit.
Request for quotations : replacement of heat metering devices in grabovskoy aop and tereshkovichskaya aop
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Request for quotations : selection of a contractor to carry out maintenance work on group heat metering devices, automatic control systems for heat energy consumption, remote sensing systems and heating system pumps, cold and hot water supply in residential buildings, transferred for servicing to the state-owned enterprise leninsky housing and communal services district of minsk
Smart metering devices can be a great utility in ensuring the transparency and theft identification", MianZahid Hussain, President Businessmen and Intellectual Forum (PBIF) proposed the solution in a meeting.
The project, worth $207.4 million involves installation of 1 million metering devices by 2018.
Summary: Paris: Itron, the largest US maker of metering devices that save energy and cut waste, ...