KR200456696Y1 - Active supply pressure control display device of compressed air - Google Patents

Abstract

The present invention can check the change of the flow rate of compressed air by displaying the supply air pressure and demand air pressure together in the device which stabilizes the demand pressure by adjusting the supply flow rate of the compressed air on the supply side according to the demand of the compressed air. It relates to a supply pressure control and display device of compressed air.

The supply pressure control and display device of the compressed air according to the present invention is installed between the outlet side of the storage tank 15 located in the compressor chamber 10 and the header line 30 to determine the opening angle of the on / off valve provided therein. Flow rate control means 20 for controlling the supply flow rate of the compressed air supplied to the head line 30 by varying and the compressed air supplied to the header line 30 side is installed on the outlet side of the flow rate control means 20 According to the difference between the downstream pressure sensor 300 for measuring the supply pressure of the pressure, the pressure value measured through the downstream pressure sensor 300 and the predetermined pressure value through the control unit 120 of the flow rate control means 20 In the compressed air supply pressure control device having a controller 100 for controlling the drive to adjust the supply flow rate of the compressed air supplied to the header line 30 side, the compressor chamber (10) at the inlet side of the flow rate control means (20) From Upstream pressure sensor 200 is installed to measure the supply pressure of the compressed air supplied from the air to the controller 100, the controller 100 through the upstream pressure sensor 200 and the downstream pressure sensor 300 Characterized in that the screen control unit 112 for outputting the amount of change over time of the measured pressure value to the LCD display unit 130 in the form of a graph with a predetermined pressure value set by the operation unit 120 is characterized in that it is provided.

Compressed Air, Supply Pressure, Flow Control, Flow Control, Flow Display

Description

Active supply pressure control display device of compressed air}

The present invention relates to a supply pressure control and display device of the compressed air, in particular in the device to stabilize the pressure on the demand side by adjusting the supply flow rate of the compressed air on the supply side in accordance with the demand of the compressed air The present invention relates to a supply pressure control and display device for compressed air for displaying the air pressure together so that the flow rate of the compressed air can be confirmed.

In line with the automation trend of production facilities, pneumatic devices using pneumatics as the main energy source are widely used throughout the industry. These pneumatic devices are safer and have higher energy density per unit volume than those using electricity as an energy source. It is used as a main energy source for various production equipment.

However, the conventional pneumatic device supplies compressed air at the maximum pressure to prevent the sudden drop of the supply air pressure caused by the sudden change in the demand for pneumatic pressure, the pressure loss caused by the supply of the compressed air occurs to cause energy waste The supply of high pressure compressed air causes a problem of shortening the life of the device.

In accordance with this problem, the present applicant has proposed a patent registration No. 644751, "Active Servo Control System for Compressed Air Supply Pressure." Actively regulated through the control means to stabilize the pressure on the demand side to prevent unnecessary power loss.

In addition, the registered patent is equipped with a pressure sensor on the outlet side of the flow rate control means is adjusted by the flow rate control means to measure the pressure of the compressed air supplied to the demand side and outputs it in the form of a graph on the LCD display to the user of the device This makes it easy to see changes in operating conditions and supply pressures.

However, the registered patent does not provide a change in the air pressure supplied from the compressor chamber before being controlled by the flow regulating means, but provides only the pressure of the compressed air supplied by the flow regulating means and supplied to the demand side, thereby changing the overall air pressure. It was difficult to grasp the pattern. That is, the registered patent shows the air pressure adjusted by the flow rate adjusting means, and since the adjusted air pressure has a constant value, it is difficult to accurately grasp the performance of the device because it is displayed in a monotonous straight form.

In addition, the registered patent is not provided with a means for warning when the air pressure supplied to the consumer side due to a malfunction of the system or the compressor down falls below a certain pressure.

Therefore, the present invention has been proposed to solve the above-mentioned problems of the prior art, and an object of the present invention is to monitor and measure both the air pressure supplied from the compressor chamber and the air pressure supplied to the demand side through the flow rate adjusting means. To provide a supply pressure control and display device of the compressed air.

Another object of the present invention is to provide a supply pressure control and display device for compressed air that can warn the outside when the air pressure supplied to the consumer side due to a malfunction of the system or the compressor down falls below a certain pressure.

The supply pressure control and display device of the compressed air according to the present invention for achieving the above object is provided between the outlet side and the header line of the storage tank located in the compressor chamber by varying the opening angle of the on-off valve provided therein A flow rate adjusting means for adjusting a supply flow rate of the compressed air supplied to the headline side, a downstream pressure sensor installed at an outlet side of the flow rate adjusting means to measure a supply pressure of the compressed air supplied to the header line side, and the downstream pressure sensor Compressed air supply pressure control device having a controller for controlling the flow of the compressed air supplied to the header line by controlling the driving of the flow control means according to the difference between the pressure value measured through the pressure value and the preset pressure value through the operation unit In the inlet side of the flow rate control means is supplied from the compressor chamber An upstream pressure sensor is installed to measure and transmit a supply pressure to a controller, and the controller has a preset pressure value set by the operation unit to change the time-based change of the pressure value measured through the upstream pressure sensor and the downstream pressure sensor. In addition, a screen control unit for outputting the LCD in the form of a graph is provided.

The screen control unit separates the change amount over time and the set pressure value of the pressure value measured by the upstream pressure sensor and the downstream pressure sensor, respectively, and outputs the graph to the LCD display in a graph every 10 minutes. It will move and display the change amount for 50 minutes.

In addition, the controller is provided with a warning control unit for outputting a warning signal to the warning unit equipped with a lamp and a buzzer when the pressure value measured by the downstream pressure sensor falls below the preset warning reference pressure value by the operation unit, the warning The negative buzzer may be limited in driving depending on the setting of the operation unit.

The screen control unit displays the warning reference pressure value set by the operation unit in a graphic form on the LCD display along with the change amount over time and the set pressure value of the pressure value measured by the upstream pressure sensor and the downstream pressure sensor. Values and warning reference pressure values are displayed in dotted lines on the LCD display, and changes over time of pressure values measured by the upstream pressure sensor and the downstream pressure sensor are displayed in solid lines on the LCD display.

The operation unit of the controller includes a basic setting menu for allowing a user to change a setting value arbitrarily, and a security setting menu for allowing a user to change a setting after authentication through a password when selecting an item.

The supply pressure control and display device of the compressed air according to the present invention can be controlled by measuring both the air pressure supplied from the compressor chamber and the flow rate adjusting means so that the user can monitor and monitor the overall change of air pressure. There is an effect that can be easily identified.

In addition, the supply pressure control and display device of the compressed air according to the present invention can warn the outside when the air pressure supplied to the consumer side is lowered below a certain pressure due to a malfunction of the system or the compressor down, etc. It is effective to prevent serious disruption in production.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Since the supply pressure control and display device for compressed air according to the present invention uses the configuration of the applicant's patent registration No. 644751 "Compressed Air Active Servo Control System", detailed description of the same configuration and operation will be omitted.

1 is a configuration diagram of a compressed air supply device to which a supply pressure control and display device of compressed air according to an embodiment of the present invention is applied.

As shown in FIG. 1, the compressed air supply device of a large plant to which the compressed air supply pressure control and display device according to the present invention is applied is a compressor 11 for compressing air, and foreign substances such as dust contained in compressed air. The primary filter 12 and the secondary filter 13 to remove the air, an air dryer 14 to remove moisture from the compressed air, a storage tank 15 to store the compressed air, and the storage tank 15 The flow rate control means 20 for adjusting the flow rate of the compressed air stored in the, the header line 30 for supplying compressed air to the demand side, and the flow rate control means 20 of the compressed air supplied to the demand side It comprises a controller 100 for adjusting the flow rate. Hereinafter, in the exemplary embodiment of the present invention, the compressor 11, the primary filter 12, the secondary filter 14, the air dryer 14, and the storage tank 15 may be referred to as a compressor chamber 10. Since the structure of the compressor chamber 10 follows a known structure, detailed description thereof will be omitted.

Flow control means 20 according to an embodiment of the present invention is installed in the connection pipe connecting between the outlet side and the storage line 15 of the storage tank 15 of the compressor chamber 10 is a control input from the controller 100 The supply flow rate of the compressed air supplied to the header line 30 from the outlet side of the storage tank 15 is adjusted according to the signal. To this end, the flow control means 20 is composed of a valve positioner equipped with a pneumatic actuator and a butterfly valve which is an open / close valve. The valve positioner drives the pneumatic actuator according to a control signal input from the controller 100 to connect the pipe. The opening and closing angle of the butterfly valve installed inside is adjusted.

Upstream pressure sensor 200 for measuring the pressure of the supply compressed air supplied from the compressor chamber 10 and the pressure of the compressed air supplied to the header line 30 at the inlet side and the outlet side of the flow rate control means 20 and Downstream pressure sensors 300 are respectively installed. The pressure signal measured through the upstream pressure sensor 200 and the downstream compression sensor 300 is transmitted in real time to the controller 100, in the embodiment of the present invention the upstream pressure sensor 200 and the downstream pressure sensor 300 The small size and light weight is applied to the capacitive semiconductor sensor which is very resistant to vibration.

The controller 100 controls the driving of the flow rate adjusting means 20 according to the measured pressure value input from the downstream pressure sensor 300 installed at the outlet side of the flow rate adjusting means 20, and the upstream pressure sensor 200 and The pressure value measured by the downstream pressure sensor 300 is controlled to display in the form of a graph over time through the LCD display 130. In addition, the controller 100 warns to the outside through the warning unit 140 when the pressure value measured through the downstream pressure sensor 300 falls below the warning reference pressure value.

Figure 2 shows a block diagram of a controller according to an embodiment of the present invention.

As shown in FIG. 2, the controller 100 according to the present invention includes an operation unit 120 receiving a user's operation signal, an LCD display unit 130 displaying a supply pressure control state of compressed air, and compressed air. Warning unit 140 to warn the outside when the supply pressure falls below the reference value, the microcomputer 110 for controlling the driving of the overall device, the pressure input from the upstream pressure sensor 200 and the downstream pressure sensor 300 Amplification unit 160 for amplifying the signal and transmitting it to the microcomputer 110, and a signal converter 150 for converting the control signal output from the microcomputer 110 into an electrical signal and transmitting to the flow rate control means 20 And a communication unit 170 for performing communication with an external device under the control of the microcomputer 110.

The operation unit 120 is composed of various function setting keys provided on the lower portion of the LCD display unit 130 installed on the front of the controller 100. The operation unit 120 has a △ · ▽ direction key and direction key operation for selecting a function setting menu. There is provided a selection key for selecting a menu moved by. The function setting menu of the operation unit 120 according to an embodiment of the present invention includes a main menu, a basic setting menu, and a security setting menu, and the main menu is a main graphic screen displayed on the LCD display 130 as a supply pressure setting function. Use the arrows on the screen to adjust. The basic setting menu allows the user to change the setting value arbitrarily, and the security setting menu is configured to change the setting after authentication through a password when selecting an item so that the user cannot change the setting arbitrarily. 3 is an example of an operation screen set through an operation unit according to an embodiment of the present invention, and a basic setting menu includes an alarm sound setting an ON / OFF operation of an alarm sound, an alarm setting setting an alarm driving reference value, and a screen brightness setting. , Time setting, etc., and the security setting menu includes functions such as zero pressure measurement, gain adjustment, normally open / close setting, valve installation, etc. to compensate for pressure measurement according to the surrounding environment.

The microcomputer 110 calculates an actual pressure value for the pressure measurement values input from the upstream pressure sensor 200 and the downstream pressure sensor 300 according to an operation signal input from the operation unit 120, and calculates the calculated actual pressure measurement value. The screen signal is output to the LCD display 130 according to the change of time. In addition, the microcomputer 110 outputs a control signal for controlling the driving of the flow control means 20 according to the difference between the actual pressure measurement value and the preset pressure set value through the downstream pressure sensor 300, the downstream pressure sensor When the actual pressure value measured through the 300 falls below the warning reference pressure value, the driving of the entire apparatus is controlled to warn the outside through the warning unit 140.

To this end, the microcomputer 110 includes a memory 111, a timer 114, an AD (analog / digital) converter 117, a data correction unit 115, a flow control controller 116, a screen controller 112, The warning control unit 113 and the central processing unit 118 are provided.

The memory 111 is a pressure setting value input from the various programs and the control unit 120 to control the driving of the overall device, pressure measurement values and pressure correction values input from the pressure sensors 200, 300, for warning Alarm reference pressure value is saved.

The AD converter 117 converts an electrical signal, which is an analog signal input from the upstream pressure sensor 200 and the downstream pressure sensor 300, to a digital signal. Since the output signal of the pressure sensor is weak, a pressure sensor ( An amplification unit 160 is further provided between the 200 and 300 and the AD converter 117 of the microcomputer 110 to amplify the input signal.

The pressure measured value converted into the digital signal by the AD converter 117 is corrected to the actual measured value through the data correction unit 115 under the control of the central processing unit 118. The data correction unit 115 calculates an actual pressure measurement value for the pressure measurement value input from the AD converter 117 using the pressure correction value stored in the memory 111. That is, the data correction unit 115 removes the noise component due to the surrounding environment included in the pressure measurement value to calculate the actual pressure measurement value.

The flow rate control unit 116 is the flow rate control means 20 according to the difference between the actual pressure measurement value of the downstream pressure sensor 300 output from the data correction unit 115 and the pressure set value stored in the memory 111 Outputs a control signal to control the driving of the. In the embodiment of the present invention, the flow control controller 116 is a proportional calculus controller, and generates a differential signal according to a difference between an actual pressure measurement value and a pressure set value, and a control signal corresponding to the differential signal through a proportional calculus control scheme. Generates and outputs the pulse width modulated to the signal converter 150. On the other hand, the signal conversion unit 150 converts a pulse width modulation (PWM) signal, which is a control signal output from the flow rate control controller 116, into an electrical signal and outputs it to the flow rate control means 20.

The warning control unit 113 outputs a warning signal to the warning unit 140 when the pressure value measured through the downstream pressure sensor 300 falls below the reference pressure value set through the operation unit 120. That is, when the air pressure supplied to the downstream side drops below a predetermined pressure, serious disruption may occur in the production of the device or the product, so that the warning control unit 113 is supplied to the downstream side measured through the downstream pressure sensor 300. If the value falls below the warning threshold, the user will be alerted to take the necessary action. The warning unit 140 driven by the warning control unit 113 includes a lamp 141 which blinks when a warning occurs and a buzzer 142 which generates a warning sound, and the lamp 141 and the buzzer 142 The driving may be limited by the operation unit 120. In other words, the control device according to the present invention is generally not turned off until the end of the life of the device once installed, many companies turn off the compressor (11) at night, the compressed air 11 at the moment of turning off the compressed air If the supply of is stopped and the lamp 141 and the buzzer 142 are operated at the same time, there is a possibility of causing great confusion, so it is necessary to limit the operation of the lamp 141 and the buzzer 142. In particular, even though the lamp 141 operates, the user sees only the blinking of the light, but there is no big problem in the work. Therefore, in the embodiment of the present invention, it is possible to limit the operation of the buzzer 142 through the function setting of the operation unit 120. Meanwhile, the warning unit 140 driven by the warning control unit 113 may be manufactured integrally with the controller 100 or may be manufactured separately from the controller 100.

The screen control unit 112 outputs an output screen output to the LCD display unit 130, for example, a pressure set value and a warning reference pressure value set by a user's operation, an upstream pressure sensor 200, and a downstream pressure sensor 300. The screen signal is generated and transmitted to the LCD display unit 130 so as to output a text and a graph screen for the measured supply pressure measurement value. In the embodiment of the present invention, the screen control unit 112 refers to the actual pressure measurement value output from the data correction unit 115 and time information input from the timer 114 and the pressure setting value stored in the memory 111. The screen signal is generated to output the screen in the form of a graph according to time change. In particular, the screen controller 112 displays the pressure set value and the warning reference pressure value stored in the memory 111 in a dotted line, and the pressure measured value and the downstream pressure of the upstream pressure sensor 200 output from the data correction unit 115. The screen signal is output to display the pressure measurement value of the sensor 300 in a solid line.

4 is an example of a graphic screen of the variation of the compressed air displayed on the LCD screen through the screen control unit according to an embodiment of the present invention, the screen control unit 112 is a pressure set value and the warning reference pressure set through the control unit 120 The value, the pressure value measured through the upstream pressure sensor 200 and the pressure value measured through the downstream pressure sensor 300 are simultaneously displayed on one screen, so that the user can check the fluctuation of the compressed air at once. In addition, the screen controller 112 moves the graph back by 1/6 pitches every 10 minutes on the graphic screen displayed on the LCD display 130 so that the pressure change state of the past 50 minutes can always be identified on the graph. To help. As such, through the screen control unit 112 of the microcomputer 110 outputs a screen signal for realizing the actual pressure to the pressure value measured by the upstream pressure sensor 200 and the downstream pressure sensor 300 as a real-time pressure change graph By virtue of this, it is possible to monitor the change in supply pressure.

The communication unit 170 as a wired / wireless communication interface by outputting the actual pressure measurement value output from the data correction unit 115 to the outside, and can grasp the supply pressure data measured in the field via wired / wireless on an office monitor located remotely. Make sure

Hereinafter, a process of operating the supply pressure control and display device of the compressed air according to the present invention having the above configuration will be described.

First, when the pressure measurement value is input to the controller 100 from the upstream pressure sensor 200 and the downstream pressure sensor 300 installed at the inlet side and the outlet side of the flow rate adjusting means 100, the input pressure measurement value is AD The conversion unit 117 converts the digital data. The data correction unit 115 corrects and calculates the actual pressure measurement value.

The flow rate control unit 116 included in the microcomputer 110 of the controller 100 includes the pressure set value stored in the memory 111 and the actual pressure of the downstream pressure sensor 300 input from the data correction unit 115. The driving signal of the flow rate control means 20 corresponding to the difference between the measured values is output so that the supply flow rate of the compressed air supplied to the header line 30, which is the demand side, can be adjusted.

On the other hand, the screen control unit 112 provided in the microcomputer 110 is stored in the memory 111 and the actual pressure measurement value of the upstream pressure sensor 200 and the downstream pressure sensor 300 input from the data correction unit 115 The screen signal is output so that the set pressure value and the warning reference pressure value are displayed in the form of a graph on the LCD display 130. That is, the screen controller 112 displays the change value of the actual measured pressure values of the upstream pressure sensor 200 and the downstream pressure sensor 300 output from the data correction unit 115 in a graphic form of a solid line on the LCD display unit ( 130, and at the same time, the set pressure value and the warning reference pressure value are displayed on the LCD display unit 130 in the form of a dotted line. In addition, the screen controller 112 updates the screen signal so that the pressure fluctuation for 50 minutes is displayed by moving the graph backward by 1/6 pitches every 10 minutes on the graph screen displayed on the LCD display 130. .

While the above process is in progress, the warning control unit 113 provided in the microcomputer 110 checks whether the measured pressure value of the downstream pressure sensor 300 falls below the warning reference pressure value, and the measured pressure value is the warning reference pressure. When falling to the value through the lamp 141 and the buzzer 142 of the warning unit 140 to warn the outside.

Through the above process, the LCD display unit 130 supplies the compressed air supply pressure of the compressor chamber 10 measured through the upstream pressure sensor 200 and the header line side 30 measured through the downstream pressure sensor 300. The variation of the supply pressure of the compressed air with time, the set pressure value and the warning reference pressure value are displayed. In addition, when the pressure value measured through the downstream pressure sensor 300 falls below the warning reference pressure value, the warning to the outside through the warning unit 140.

1 is an installation configuration diagram of a compressed air supply device to which the supply pressure control and display device of the compressed air according to the present invention is applied,

2 is a block diagram of a controller according to the present invention,

3 is an example of an operation screen set through the operation unit according to the present invention;

Figure 4 is an example of the fluctuation situation graphic screen of the compressed air displayed on the LCD screen through the screen control unit according to an embodiment of the present invention.

[Description of Drawings]

10: compressor room 20: flow rate control means

30: header line 100: controller

110: microcomputer 111: memory

112: screen control unit 113: warning control unit

114: timer 115: data correction unit

116: flow control unit 117: AD conversion unit

118: central processing unit 120: operation unit

130: LCD display unit 140: warning unit

150: signal conversion unit 160: amplification unit

170: communication unit 200: upstream pressure sensor

300: downstream pressure sensor

Claims (7)

delete Compressed air is provided between the outlet side of the storage tank 15 located in the compressor chamber 10 and the header line 30 to change the opening angle of the on / off valve provided therein to be supplied to the header line 30. A flow rate adjusting means 20 for adjusting a supply flow rate, a downstream pressure sensor 300 installed at an outlet side of the flow rate adjusting means 20 and measuring a supply pressure of compressed air supplied to a header line 30; Compressed air supplied to the header line 30 by controlling the driving of the flow rate adjusting means 20 according to the difference between the pressure value measured through the downstream pressure sensor 300 and the preset pressure value through the operation unit 120. In the compressed air supply pressure control device is provided with a controller 100 for adjusting the supply flow rate of An upstream pressure sensor 200 is installed at the inlet side of the flow rate control means 20 to measure the supply pressure of the compressed air supplied from the compressor chamber 10 and transmit it to the controller 100. The controller 100 has an LCD in the form of a graph with a set pressure value set by the operation unit 120 with a change amount over time of the pressure value measured through the upstream pressure sensor 200 and the downstream pressure sensor 300. The screen controller 112 outputs to the display unit 130 is provided, the screen controller 112 is a change amount and the set pressure over time of the pressure value measured through the upstream pressure sensor 200 and the downstream pressure sensor 300 Display and control the display pressure of the compressed air, characterized in that the value is separated and output to the LCD display unit 130 as a graph, the change amount of 50 minutes by moving the graph backward by 1/6 pitch at intervals of 10 minutes. . Compressed air is provided between the outlet side of the storage tank 15 located in the compressor chamber 10 and the header line 30 to change the opening angle of the on / off valve provided therein to be supplied to the header line 30. A flow rate adjusting means 20 for adjusting a supply flow rate, a downstream pressure sensor 300 installed at an outlet side of the flow rate adjusting means 20 and measuring a supply pressure of compressed air supplied to a header line 30; Compressed air supplied to the header line 30 by controlling the driving of the flow rate adjusting means 20 according to the difference between the pressure value measured through the downstream pressure sensor 300 and the preset pressure value through the operation unit 120. In the compressed air supply pressure control device is provided with a controller 100 for adjusting the supply flow rate of An upstream pressure sensor 200 is installed at the inlet side of the flow rate control means 20 to measure the supply pressure of the compressed air supplied from the compressor chamber 10 and transmit it to the controller 100. The controller 100 has an LCD in the form of a graph with a set pressure value set by the operation unit 120 with a change amount over time of the pressure value measured through the upstream pressure sensor 200 and the downstream pressure sensor 300. The screen controller 112 outputs to the display unit 130 is provided, and when the pressure value measured by the downstream pressure sensor 300 falls below the preset warning reference pressure value by the operation unit 120 lamp 141 And a warning control unit 113 for outputting a warning signal to the warning unit 140 equipped with a buzzer 142. The method of claim 3, The buzzer 142 of the warning unit 140, the drive pressure control and display device of the compressed air, characterized in that the driving is limited according to the setting of the operation unit (120). The method of claim 3, The screen control unit 112 may display a warning reference pressure value set by the operation unit 120 together with an amount of change over time and a set pressure value of the pressure value measured through the upstream pressure sensor 200 and the downstream pressure sensor 300. Supply pressure control and display device of the compressed air, characterized in that displayed on the LCD display 130 in the form of a graph. The method of claim 5, The screen control unit 112 displays the set pressure value and the warning reference pressure value by a dotted line on the LCD display unit 130, according to the time of the pressure value measured through the upstream pressure sensor 200 and the downstream pressure sensor 300. Supply amount control and display device of the compressed air, characterized in that the change amount is displayed in a solid line on the LCD display unit (130). Compressed air is provided between the outlet side of the storage tank 15 located in the compressor chamber 10 and the header line 30 to change the opening angle of the on / off valve provided therein to be supplied to the header line 30. A flow rate adjusting means 20 for adjusting a supply flow rate, a downstream pressure sensor 300 installed at an outlet side of the flow rate adjusting means 20 and measuring a supply pressure of compressed air supplied to a header line 30; Compressed air supplied to the header line 30 by controlling the driving of the flow rate adjusting means 20 according to the difference between the pressure value measured through the downstream pressure sensor 300 and the preset pressure value through the operation unit 120. In the compressed air supply pressure control device is provided with a controller 100 for adjusting the supply flow rate of An upstream pressure sensor 200 is installed at the inlet side of the flow rate control means 20 to measure the supply pressure of the compressed air supplied from the compressor chamber 10 and transmit it to the controller 100. The controller 100 has an LCD in the form of a graph with a set pressure value set by the operation unit 120 with a change amount over time of the pressure value measured through the upstream pressure sensor 200 and the downstream pressure sensor 300. The screen controller 112 outputs to the display unit 130 is provided. The control unit 120 of the controller 100 includes a basic setting menu for allowing a user to change a setting value arbitrarily, and authentication through a password when a user selects an item. Supply pressure control and display device for compressed air characterized in that it comprises a security setting menu to change the setting after.

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