Bourdon pressure transducer measure, pressure in a given instrument within some elastic limits. This is one of the varieties of pressure transducers. This transducer converts the applied force into a displacement. Therefore this is called as a force-summing device. The amount of displacement is a measure of the pressure exerted on this transducer. The range of pressure measurement depends on the material used and geometry of construction, namely circular tube or twisted tube.This tube deflects proportional to the applied pressure.

In Bourdon Pressure gauge, the measuring tube is arranged almost in a semi circular fashion. The arc of this near-semi-circular tube changes proportional to the applied pressure, causing large displacement at the farther end of this tube. A displacement transducer attached at this farther end is used to generate controlling signal to the indicating device. Bourdon pressure transducer demonstration module is an electronic instrument. This can measure pressures between 3 to 15 PSI. The output is 4 to 20mA. The current meter indicating this is linear representation of the measured pressure. The demonstration instrument has a pressure vessel. A foot pump (preferable to connect to a compressor) is used to increase air in the pressure vessel. The pressure vessel has a manually adjustable release valve to reduce the pressure, and set a predetermined pressure level.

A hand operated valve attached to the pressure vessel can also reduce the air pressure within the pressure vessel. This attachment significantly improves the understanding of the operation; this can be connected to a Data Acquisition instrument, Model DAS-1. An analog pressure gauge fitted to the vessel indicates the actual pressure for comparison. The electronics consists of power supply (to operate Bourdon pressure transducer), 4-20mA current meter, instrumentation amplifier, test points, and finally the analog output of the pressure transducer terminated on the two terminals for Data Acquisition purposes. A plot of an applied pressure Vs the analog output, or 4-20mA output gives the characteristics of the Bourdon pressure transducer. Hysterisis can be plotted. A useful attachment to this is I to P converter demonstration module.

Specifications:

• Input: 3-15 PSI (0.2 to 1Kg/cm2)
• Output: 4-20mA current.
• Built-in power supplies.
• Current meter to monitor output current.
• Air pressure by foot pump.
• 15 PJI Dial gauge.
• 2Lt Pressure vessel with manually adjustable relief valve.
• Pneumatic connections by FESTO make quick coupling connections.
• Built-in electronics.