How to Measure Electric Motor Insulation Resistance

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To prolong the life of electrical systems and motors, regular insulation resistance testing is required. Over the years, after many cycles of operation, electric motors are exposed to environmental factors such as dirt, grease, temperature, stress, and vibration. These conditions can lead to insulation failure, resulting in loss of production or even fires.

An effective motor insulation resistance system has high resistance, usually (at an absolute minimum) greater than a few mega ohms (MΩ).  A poor insulation system has lower insulation resistance. The optimal insulation resistance for an electric motor is often determined by the manufacturer’s specifications, the criticality of the application where the motor is used, and the environment where it is located.

It is practically impossible to

Basics of Control Valve Sizing – Key Terms & concepts

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Pressure Drop
The difference in pressure between upstream and downstream the control valve, caused by resistance to flow. Pressure drop is pressure loss across the valve created by system demand - NOT by the valve alone.

How to Determine Pressure Drop
To determine ΔP across a valve, subtract the outlet pressure (P2) from the inlet pressure (P1).
ΔP = P2 – P1

Importance of Pressure Drop in Valve Sizing
Pressure drop is a critical element in valve sizing and valve application. Pressure drop must be known by the engineer designing the system to ensure proper valve selection

What Determines Valve Pressure Drop?

The critical factors are orifice size and internal flow paths of the valve.

Relationship between the Flow Rate and Pressure Drop across a Control Valve
Pressure drop and flow rate are dependent on one another. The higher the flow rate through a restriction(control valve), the greater the pressure drop. Conversely, the lower the flow rate, the

How Multivariable Transmitters Work

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A multivariable transmitter is a differential pressure transmitter that is capable of measuring a number of independent process variables, including differential pressure, static pressure, and temperature. When used as a mass flow transmitter, these independent values can be used to compensate for changes in density, viscosity and other flow parameters. A typical multivariable transmitter installation and setup for flow measurement is shown below:
Multivariable Transmitter Installation & SetUp
A Multivariable transmitter delivers unprecedented performance and capabilities by providing three separate
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