Search Results for: 4 to 20 milliamps

Difference between 2 wire & 4 wire transmitter current loops

The current loop uses DC power because the magnitude of the current represents the signal level that is being transmitted. If AC power was instead used in the loop, the magnitude of current would be continuously changing, making it difficult to discern the signal level being transmitted.In this session we are gonna discuss about Difference between …

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 Process switches and alarms

Introduction Another type of instrument commonly seen in measurement and control systems is the process switch. The purpose of a switch is to turn on and off with varying process conditions. Usually, switches are used to activate alarms to alert human operators to take special action. In other situations, switches are directly used as control devices. …

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Calibration of capacitance type level transmitter

Calibration principle: Calibration Setup Safety Link: Basic Safety and General Consideration While Executing Calibration Process in process industries Method of calibration  Range selection: Zero calibration: Span Calibration: Calibration verification:  Expected current (mA) = ((Actual liquid level / Full scale level) * 16) + 4 EC = {(AL/FL) X16} +4 EC = Expected current signal in …

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HOW TO CALIBRATE DIFFERENTIAL PRESSURE TRANSMITTER?

What is a Differential Pressure Transmitter? The Differential pressure transmitter is commonly used in industries as pressure measuring instrument. It is a device that measures two opposing pressures in a pipe or a vessel. This equipment will sense the difference in pressure between two ports and produce an output signal with reference to a calibrated pressure range. In the Differential pressure transmitter, as …

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What are the differences between transducer and transmitter?

What is Transmitter? Transmitters are instruments used to generate and send electromagnetic waves which includes message or signal. A transmitter produces radio waves with the help of Antenna. Transmitter itself combines a sensor and the sensor measures the process variable and generates proportional signal. What is the working principle of Transmitter? The working principle of …

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What is Zero suppression & Zero Elevation?

Zero suppression & Zero elevation are values that correspond to the 4-20mA transmitter range for level measurement using Differential pressure transmitter (DPT). In signal conditioners, in particular, zero suppression and zero altitudes relate to a reduction (deletion) or angle (altitude) of the nominal “zero” yield so that it is not at zero volts (or milliamps). …

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