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Calibration of A pressure Gauge Apparatus

DESCRIPTION

Description:

A precision-machined stainless-steel piston and cylinder using
predetermined weights applied on the upper end of the piston
rod. An assembly gauge is connected to the cylinder, subject to
known pressures for comparison with Bourdon gauge reading. Test weights included.

The apparatus is a Bourdon gauge connected to a dead weight
tester. 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. 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.

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. The piston has a known area, so students can calculate the pressure. A flexible tube containing oil transfers the pressure on the piston to the Bourdon tube. Students add the
weights in increments, recording pressure readings from the gauge at each increment. They then remove the weights and record gauge readings. By working out theoretical results they can work out gauge error and discuss possible causes.

Technical Specification:
• Diameter of the piston: 16 mm.
• Two area of the piston: 0.000254469 m.
• Weight of the piston: 0.5 Kg.
• Set of weights:
• 10 weights of 500 g
• Bourdon Gauge 2.5 bar

EXERCISES AND PRACTICAL POSSIBILITIES:

1.- Study of the concept of pressure (force/area).

2.- Study of the function of a dead-weight pressure calibrator.

3.- Study of the concepts of measurement and calibration (gauge and
absolute pressures, zero error, non-linearity, scale error, conversion of
arbitrary scale into engineering units).

4.- Study of pressure scales.

5.- Study of the operation and characteristic behavior of a Bourdon type
manometer.

6.- Checking the readings of a Bourdon type manometer using a standard set
of calibrated weights.

7.- Calibration of a Bourdon type manometer in engineering two units
(kN/m²).

8.- Calibration of a Bourdon type manometer in arbitrary units (angular
displacement of needle).

9.- Study of the operation and characteristic behavior of a pressure sensor.

10- Calibration of a pressure sensor (output voltage of the sensor).

11.- Calibration of a pressure sensor and signal conditioning circuit in
engineering units.

12.- Study of the sources of error in measuring and calibration (signal
conditioning, manufacturing tolerances, display resolution, friction and
backlash…)