Burdon tube in gauges
The tube bearing is an elastic deforming element. The elastic element of this barometer is made in three types of tubes: C-shaped, spring and screw, which make it possible to measure pressure locally as well as remotely. Borden pressure gauges have many advantages, which have been extended to their applications in industry.
Some of the advantages of this sphygmomanometer are:
* Cheap price
* Long life
* High pressure range
* Good accuracy
* High safety at high pressure
* Ability to easily communicate with transducers and send pressure by standard signals Precision instrument cutting tubes despite the advantages
They also have many disadvantages, which include:
– Low measurement accuracy at pressures below 50 psi
– Their sensitivity to shock and vibration
– High hysteresis (inability to return to zero in the return path of the signal)
1 -) Bourdon C-shaped tube (C – Bourdon)
The C-shaped tube is the most common type of sphygmomanometer used in the industry. The gauge is shaped like a 250 degree arc. One side of the pipe is closed and the other side is connected to the pressure tank by a valve. When pressure is applied to the inside of the tube, the tube opens due to its elastic property, the amount of opening of which depends on the pressure inside the tube, and the pressure can be measured by measuring the amount of opening of the tube. This can be done by connecting the pipe to a gear hand according to the figure.
The C-shaped tube has a high accuracy (from + 0.5% / + to 2% / + or less) and can be used for pneumatic systems and electronic transmission systems. To increase the sensitivity of the pressure gauge, instead of the gear mechanism can be In this method, the deformation of the tube causes the core to be displaced in the LVDT and a voltage proportional to the input pressure is generated at the LVDT output, which can be measured by measuring the voltage with the help of a transmitter. The standard signal form sent the instrument to the pressure monitor control equipment.
2 -) Spiral tube
When the free end motion of the C-shaped tube does not have the necessary and sufficient force, the spiral element can be created by increasing the length and deforming the C-tube.
The spiral element creates a larger movement at the free end of the tube, which in most cases does not require mechanical reinforcement, so this element has a higher sensitivity and accuracy than the C-shaped tube.
Helical edging elements are very similar to helical elements, except that the twist increases in helical form, which causes significant movement, thus having more reinforcement than the helical element. Usually a central shaft is installed in the middle of the helical element and a pointer attached to this shaft is also driven by it.
The advantages of the helical element are:
* High suffering capacity
* Stability in oscillating and variable pressure services
* Good coordination in high pressure services
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