How To Calibrate a P/I Transmitter in a Classified Location- With a built-in hand pump, precision measurement of both pressure and current, the Fluke 718Ex Pressure Calibrator is a complete, self-contained tool for the calibration of P/I transmitters. To calibrate a 3 psi to 15 psi/4 mA to 20 mA transmitter using a Fluke 718Ex 30G Pressure Calibrator :
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Three-Phase AC Induction Motors Construction
Three-phase AC induction motors Construction - Three-phase AC induction motors are commonly used in industrial applications. This type of motor has three main parts, rotor, stator, and enclosure. The stator and rotor do the work, and the enclosure protects the stator and rotor.
Relationship of Speed, Torque, and Horsepower | Motor Application
Relationship of Speed, Torque, and Horsepower | Motor Application - Constant horsepower applications require a constant force as radius changes. A lathe, for example, starts out with a certain diameter object. As the object is cut and shaped the diameter is reduced. The cutting force must remain constant. Another example of a constant horsepower application is a winder where radius increases as material is added to a roll and decreases as material is removed.
Applications, such as lathes, that are driven in a continuous Torque, and Horsepower circular motion are sometimes referred to as spindle drives. Horsepower will remain constant in a spindle drive application. The surface speed in feet per minute (FPM) is equal to 2π times the radius (in feet) of the material times the speed in RPM. Surface speed will remain constant as the material is shaped and the radius reduced. Torque is equal to force times radius.
Horsepower is equal to torque times speed.
Surface Speed (FPM) = 2π x Radius x Speed (RPM)
Torque = Force x Radius
HP = Torque x Speed
The drive increases the speed (RPM) of the material as the radius is reduced. If the cutting tool has cut away half of the radius, for example, the RPM must double to maintain a constant surface speed (FPM). Reducing the radius by half will cause a corresponding reduction in torque. A doubling of speed (RPM) and a reduction of torque by half causes horsepower to remain constant.
A smaller radius requires less torque to turn. Because torque decreases with a smaller radius, motors operating a constant horsepower application can be run above base speed. A 60 Hz motor, for example, could be run at 90 Hz when the radius is at minimum. RPM must increase to keep surface speed constant. An increase of speed (RPM) and a decrease in torque means horsepower will remain constant.
Keyword : Relationship of Speed, Torque, and Horsepower | Motor Application
Applications, such as lathes, that are driven in a continuous Torque, and Horsepower circular motion are sometimes referred to as spindle drives. Horsepower will remain constant in a spindle drive application. The surface speed in feet per minute (FPM) is equal to 2π times the radius (in feet) of the material times the speed in RPM. Surface speed will remain constant as the material is shaped and the radius reduced. Torque is equal to force times radius.
Horsepower is equal to torque times speed.
Surface Speed (FPM) = 2π x Radius x Speed (RPM)
Torque = Force x Radius
HP = Torque x Speed
The drive increases the speed (RPM) of the material as the radius is reduced. If the cutting tool has cut away half of the radius, for example, the RPM must double to maintain a constant surface speed (FPM). Reducing the radius by half will cause a corresponding reduction in torque. A doubling of speed (RPM) and a reduction of torque by half causes horsepower to remain constant.
Surface Speed (FPM) = 2π x (Radius/2) x 2 x Speed (RPM)
Torque = Force x (Radius/2)
HP = (Torque/2) x Speed
A smaller radius requires less torque to turn. Because torque decreases with a smaller radius, motors operating a constant horsepower application can be run above base speed. A 60 Hz motor, for example, could be run at 90 Hz when the radius is at minimum. RPM must increase to keep surface speed constant. An increase of speed (RPM) and a decrease in torque means horsepower will remain constant.
Keyword : Relationship of Speed, Torque, and Horsepower | Motor Application
How To Read AC Motor Nameplate Data
How To Read AC Motor Nameplate Data - The nameplate of a motor provides important information necessary when applying a motor to an AC drive. The following drawing illustrates the nameplate of a sample 20 horsepower AC motor.
Selecting The Right Flowmeter Size
Selecting The Right Flowmeter Size - There are certain factors which affect the measurement of a fluid’s
flow rate with a rotameter. The fluid’s temperature, pressure and specific gravity all impact gas flow measurements.
Turbine Flowmeter (Rotameter) Basic Principles
Turbine Flowmeter Basic Principles - Flowmeters are used in fluid systems (liquid and gas) to indicate
the rate of flow of the fluid. They can also control the rate of flow if they are equipped with a flow control valve. Rotameters are a particular kind of flowmeter, based on the variable area principle. They provide a simple, precise and economical means of indicating flow rates in fluid systems.
This variable area principle consists of three basic elements: A uniformly tapered flow tube, a float, and a measurement scale. A control valve may be added if flow control is also desired.
the rate of flow of the fluid. They can also control the rate of flow if they are equipped with a flow control valve. Rotameters are a particular kind of flowmeter, based on the variable area principle. They provide a simple, precise and economical means of indicating flow rates in fluid systems.
This variable area principle consists of three basic elements: A uniformly tapered flow tube, a float, and a measurement scale. A control valve may be added if flow control is also desired.
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