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Variable area meters are special form of head meters. Where in the area of flow restrictor is varied. So as to HOLD the differential pressure CONSTANT. The rota meter consists of a vertical tapered tube through which the metered fluid flows in UPWARD direction. As the flow VARIES the ‘float’ rises or falls to VARY the area of the passages that the differential across it balances the gravitational force on the ‘float’. The differential pressure is maintained constant. The position of the ‘float’ is the measure of the rate of flow.

Variable area meters are special form of head meters. Where in the area of flow restrictor is varied. So as to hold the differential pressure constant. The rota meter consists of a vertical tapered tube through which the metered fluid flows in upward direction. As the flow varies the ‘float’ rises or falls to vary the area of the passages that the differential across it balances the gravitational force on the ‘float’. The differential pressure is maintained constant. The position of the ‘float’ is the measure of the rate of flow.

In numerous applications, it is neither desirable nor practical to expose a temperature sensor directly to a material. Wells are THEREFORE used to protect against damage corresion, arosion, aborsion and high pressure processes. A thermo well is also useful in protecting a sensor from physical damage during handling and normal operations.
Materials used in thermo wells: Stainless steel, INCONEL, Monel, ALLOY Steel, Hastelloy

In numerous applications, it is neither desirable nor practical to expose a temperature sensor directly to a material. Wells are therefore used to protect against damage corresion, arosion, aborsion and high pressure processes. A thermo well is also useful in protecting a sensor from physical damage during handling and normal operations.
Materials used in thermo wells: Stainless steel, Inconel, Monel, Alloy Steel, Hastelloy

BURNOUT provides the warnsug feature of driving indicator at the end of scale, if the INPUT circuit is OPEN. A burnout resistor is provided which develops a voltage drop between the measuring circuit and amplifier. The polarity of the SIGNAL determines the direction of the servo drive upon an open circuit in the input.

UPSCALE burnout: R value 10 M
Downscale burnout: R value 22 M

Burnout provides the warnsug feature of driving indicator at the end of scale, if the input circuit is open. A burnout resistor is provided which develops a voltage drop between the measuring circuit and amplifier. The polarity of the signal determines the direction of the servo drive upon an open circuit in the input.

Upscale burnout: R value 10 M
Downscale burnout: R value 22 M

Bernoulli’s theorem states that the ‘total energy of a LIQUID flowing from one point to another remains constant’. It is applicable for non-compressible liquids. For different types of liquid flow Bernoulli’s equation changes. There is direct proportion between speed of fluid and its dynamic pressure and its KINETIC energy. It can be used in various real LIFE situations like measuring pressure on aircraft wing and calibrating the airspeed indicator. It can also be used to low pressure in the VENTURI tubes PRESENT in carburetor.

Bernoulli’s theorem states that the ‘total energy of a liquid flowing from one point to another remains constant’. It is applicable for non-compressible liquids. For different types of liquid flow Bernoulli’s equation changes. There is direct proportion between speed of fluid and its dynamic pressure and its kinetic energy. It can be used in various real life situations like measuring pressure on aircraft wing and calibrating the airspeed indicator. It can also be used to low pressure in the venturi tubes present in carburetor.