Th2 Pressure Measurement and Calibration
PRESSURE MEASUREMENT AND CALIBRATION
YEDĐTEPE UNIVERSITY DEPARTMENT OF MECHANICAL ENGINEERING
1
YEDITEPE UNIVERSITY ENGINEERING FACULTY
MECHANICAL ENGINEERING LABORATORY
Pressure Measurement and Calibration
1. Objective:
To convert an arbitrary scale of pressure sensor output into engineering units. To calibrate a semiconductor pressure sensor.
2. Equipment:
The equipment comprises a Dead-weight Pressure Calibrator (DPC), Bourdon gauge and diaphragm-type pressure sensor.
The DPC consists of a precision ground piston and cylinder with a set of weights. In normal use, the required combination of weights is applied to the piston to produce the required pressure, and the piston is then spun to reduce vertical friction while the readings from the sensors are taken.
The Bourdon gauge is a traditional instrument with a rotary scale and mechanical indicator. The clear dial face allows observation of the mechanism. The dial is calibrated both in arbitrary units (degrees of rotation) and engineering units of pressure (kN/m² or kPa).
The electronic pressure sensor incorporates a semi-conductor diaphragm that deflects when pressure is applied by the working fluid. The deflection generates a voltage output that is proportional to the deflection, and hence to the applied pressure.
The two pressure sensors are mounted on a manifold block with a reservoir to contain the hydraulic fluid. An isolating valve allows the water flow to be restricted, to demonstrate the effect of damping.
The voltage from the electronic pressure sensor is displayed on a digital meter on the electrical console. An additional conditioning circuit incorporates zero and span adjustments, and allows the voltage output from the pressure sensor to be converted and displayed as a direct pressure reading. The zero and span controls are mounted on the front of the console, and a selector switch allows the voltage output or the direct reading to be displayed as required.
3.
YEDĐTEPE UNIVERSITY DEPARTMENT OF MECHANICAL ENGINEERING
1
YEDITEPE UNIVERSITY ENGINEERING FACULTY
MECHANICAL ENGINEERING LABORATORY
Pressure Measurement and Calibration
1. Objective:
To convert an arbitrary scale of pressure sensor output into engineering units. To calibrate a semiconductor pressure sensor.
2. Equipment:
The equipment comprises a Dead-weight Pressure Calibrator (DPC), Bourdon gauge and diaphragm-type pressure sensor.
The DPC consists of a precision ground piston and cylinder with a set of weights. In normal use, the required combination of weights is applied to the piston to produce the required pressure, and the piston is then spun to reduce vertical friction while the readings from the sensors are taken.
The Bourdon gauge is a traditional instrument with a rotary scale and mechanical indicator. The clear dial face allows observation of the mechanism. The dial is calibrated both in arbitrary units (degrees of rotation) and engineering units of pressure (kN/m² or kPa).
The electronic pressure sensor incorporates a semi-conductor diaphragm that deflects when pressure is applied by the working fluid. The deflection generates a voltage output that is proportional to the deflection, and hence to the applied pressure.
The two pressure sensors are mounted on a manifold block with a reservoir to contain the hydraulic fluid. An isolating valve allows the water flow to be restricted, to demonstrate the effect of damping.
The voltage from the electronic pressure sensor is displayed on a digital meter on the electrical console. An additional conditioning circuit incorporates zero and span adjustments, and allows the voltage output from the pressure sensor to be converted and displayed as a direct pressure reading. The zero and span controls are mounted on the front of the console, and a selector switch allows the voltage output or the direct reading to be displayed as required.
3.