Experiments
Calibrating a Bourdon type pressure gauge.
Specification
Pressure Gauge
Diameter: 6” or 150mm
Bourdon Tube Pressure Range: 0~400kN/m2 Pressure Least Count: 10kN/m2
Alternate Scale: PSI / bar
Description
Calibration is a process for detecting deviations in a measuring instrument compared to a reference instrument or universally accepted standard value. This observed deviation is taken into account in the subsequent use of the calibrated measuring instrument and adjusted if necessary.
Dead Weight Pressure Calibrator is a device designed as an introduction to the basics of checking and calibrating a manometer (Pressure gauges/transmitter). Dead Weight Pressure Calibrator apparatus consists of a precision machined piston and cylinder assembly mounted on leveling screws. A Bourdon gauge is supplied for calibration.
A defined force is applied by loading the piston with dead weights. The ratio of force / piston cross-sectional area results in a defined test pressure. Hydraulic oil is used to transfer the force. If the pressure in the system rises, the force acts against the spring of the Bourdon tube pressure gauge. The test pressure that is produced can be read on the manometer’s dial. The Bourdon Tube mechanism of a pressure gauge working is clearly visible through the transparent dial. Loading the calibrated piston manometer with weights produces a very accurate, reproducible calibration pressure, which can be used to check and calibrate the manometer.
The weights supplied are added to the upper end of the piston rod which is rotated to minimize friction effects. The gauge is thus subject to known pressures which may be compared with the gauge readings and an error curve drawn.
