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Calibration of a Pressure Gauge
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Calibration of a Pressure Gauge
• Pressure gauge with visible working mechanism to demonstrate how this type of pressure gauge works and how to calibrate it.
• The apparatus is a gauge connected to a dead weight tester.
• Gauge has a transparent dial that allows students to see the working mechanism.
• The mechanism is a thin walled tube with an oval cross-section, bent into an arc.
• One end of the tube is held rigidly.This end admits pressure.
• To calibrate the gauge, students add weights to a platform on a dead weight tester.
• The weights put a known force on to a piston.
• They then remove the weights and record gauge readings.
• The piston has a known area, so students can calculate the pressure.
• A flexible tube containing water transfers the pressure on the piston to the tube.
• Students add the weights in increments, recording pressure readings from the gauge at each increment.
• The other end of the tube, connected to a dial and pointer mechanism, is free to move.
• When the pressure in the tube increases, it tries to straighten and so moves the pointer by an amount proportional to the pressure increase.
• The apparatus is a gauge connected to a dead weight tester.
• Gauge has a transparent dial that allows students to see the working mechanism.
• The mechanism is a thin walled tube with an oval cross-section, bent into an arc.
• One end of the tube is held rigidly.This end admits pressure.
• To calibrate the gauge, students add weights to a platform on a dead weight tester.
• The weights put a known force on to a piston.
• They then remove the weights and record gauge readings.
• The piston has a known area, so students can calculate the pressure.
• A flexible tube containing water transfers the pressure on the piston to the tube.
• Students add the weights in increments, recording pressure readings from the gauge at each increment.
• The other end of the tube, connected to a dial and pointer mechanism, is free to move.
• When the pressure in the tube increases, it tries to straighten and so moves the pointer by an amount proportional to the pressure increase.
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