JP2018160511A - Monitoring apparatus, automatic cash dispenser, monitoring method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring device for detecting a clogging degree of a filter.SOLUTION: A monitoring device 50B includes a calculation unit 52 that calculates the clogging degree of a filter that removes a foreign matter contained in a gas sent by a fan that sends gas outside the machine to the interior of the machine based on a difference between the external air pressure and the internal air pressure and outputs an output signal related to the calculated clogging degree of the filter, and an output control unit 54 that permits output of the output signal in a state in which a door partitioning the outside and the inside is closed and prohibits output of the output signal in a state in which the door opens.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a monitoring device, an automatic teller machine, a monitoring method, and a program for detecting the degree of filter clogging.

  Inside a machine such as an automatic teller machine (ATM), air is forcibly sent from the outside by a fan. Thereby, the inside of the machine is cooled. A dustproof filter for removing dust is provided at the inlet to the inside of the machine. The fan introduces air into the machine through this filter. Thereby, the air from which dust has been removed is introduced into the machine. The dustproof filter is clogged by dust adhering thereto.

  A dust detection device that detects a clogged state of a dustproof filter is known (see Patent Document 1). The dust detection device includes a dustproof filter, a sensor that detects a pressure outside the machine, and a sensor that detects a pressure inside the machine. The dust detection device further includes a detection unit for detecting clogging of the filter based on a difference between the pressure outside the machine and the pressure inside the machine, and a notification notifying when a filter clogging is detected. A part.

JP 2001-252513 A

  Machines such as automatic teller machines are provided with doors. When the door is closed, the pressure inside the machine is higher than the pressure outside the machine. This is because air is sent in by the fan. On the other hand, when the door is open, the inside and outside of the machine communicate with each other, so that the air pressure inside the machine decreases. Therefore, when the door is open, even if the dust filter is not clogged, the pressure difference between the pressure outside the machine and the pressure inside the machine becomes small.

  In the dust detection apparatus described in Patent Document 1, when the difference between the pressure outside the machine and the pressure inside the machine is equal to or greater than a predetermined value, it is determined that the dust filter is clogged. Therefore, in this dust detection device, there is a possibility that the dust filter is determined to be clogged when the difference between the pressure outside the machine and the pressure inside the machine is small due to the door being opened. There is. Therefore, in this dust detection device, there is a possibility that the filter clogging is detected even though the filter is actually not clogged. For this reason, it has been desired to prevent the notification that the filter is clogged by mistake.

  An example of an object of the present invention is to provide a technique for preventing notification of erroneous information related to filter clogging.

  In the monitoring apparatus according to the first embodiment of the present invention, the degree of clogging of the filter that removes foreign matters contained in the gas fed by the fan that feeds the gas outside the machine to the inside of the machine is determined based on the external pressure and the internal pressure. When the calculation unit that outputs the output signal related to the calculated degree of clogging of the filter and the door that partitions the outside and the inside is closed An output control unit that permits the output of the output signal and prohibits the output of the output signal when the door is open.

  The automatic teller machine according to the second embodiment of the present invention includes the above monitoring device.

  In the monitoring method according to the third embodiment of the present invention, the degree of clogging of the filter that removes foreign matters contained in the gas fed by the fan that feeds gas outside the machine into the inside of the machine is determined based on the external atmospheric pressure and the internal pressure. And calculating an output signal related to the calculated degree of clogging of the filter, and when the door separating the outside and the inside is in a closed state, the output signal Allowing output, and prohibiting output of the output signal when the door is open.

  According to a fourth embodiment of the present invention, there is provided a program for determining the degree of clogging of a filter that removes foreign matters contained in a gas fed by a fan that feeds gas outside the machine into the machine, and the external pressure and the internal pressure. Calculate based on the difference from the atmospheric pressure, output an output signal related to the calculated degree of filter clogging, and output the output signal when the door separating the outside and the inside is in a closed state And prohibiting the output of the output signal when the door is open.

  According to the present invention, since the output of a signal is prohibited when the door is in an open state, it is possible to prevent notification of erroneous information regarding filter clogging.

It is a schematic diagram which shows the automatic teller machine which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the monitoring apparatus which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the specific example of the flow of a process by the monitoring apparatus shown in FIG. It is a block diagram which shows the monitoring apparatus which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the monitoring apparatus which concerns on the 3rd Embodiment of this invention.

(First embodiment)
FIG. 1 is a schematic diagram showing an automatic teller machine (ATM) A according to a first embodiment of the present invention. The automatic teller machine A is a machine that enables transactions such as cash receipt and payment by customer operations. The automatic teller machine A is an example of a machine. The automatic teller machine A is installed in a financial institution or the like. The automatic teller machine A has an active ventilation (ventilation) function that sucks outside air into the housing, cools internal devices while increasing the internal pressure, and discharges air (gas) to the outside through gaps in various places in the housing . The active ventilation function is generally employed as a device cooling method in a dusty environment.

  The automatic teller machine A is communicably connected to the external device B. The external device B is, for example, a terminal such as a personal computer of a trader who performs maintenance and maintenance of the automatic teller machine A. The automatic teller machine A includes a housing 11, an air filter (dust-proof filter) 12, a fan 13, a first door sensor 14, a second door sensor 15, an external air pressure sensor 16, an internal air pressure sensor 17, and a monitoring device 50. ing. Hereinafter, the air filter 12 may be simply referred to as a filter 12.

  The housing | casing 11 is comprised by the wall which partitions the inside and the exterior of the automatic teller machine A. The housing 11 includes a first door 111 and a second door 112. The doors 111 and 112 can be opened and closed freely. The doors 111 and 112 are, for example, a cover, a shutter, and a maintenance door. In a normal operation state, the doors 111 and 112 are closed. In a normal operation state, the atmospheric pressure inside the automatic teller machine A is set to be higher than the atmospheric pressure outside the automatic teller machine A. This is to prevent dust from entering the automatic teller machine A. The doors 111 and 112 are opened when a bill or coin is inserted or removed, or when a medium is replenished or maintained. In a state where the doors 111 and 112 are opened, airflows F1 and F2 flowing through openings formed by opening the doors 111 and 112 are generated. Since the atmospheric pressure inside the automatic teller machine A is higher than the external atmospheric pressure, the airflows F <b> 1 and F <b> 2 are airflows that exhaust the air inside the housing 11 to the outside of the housing 11.

  The filter 12 removes foreign matters such as dust. The filter 12 is clogged due to accumulation of foreign matter. The fan 13 is attached to the housing 11. The fan 13 faces the filter 12 and is provided on the inner side of the automatic teller machine A than the filter 12. The fan 13 generates an air flow F <b> 3 that takes in external air (gas) from which foreign matter has been removed by the filter 12 into the housing 11. When air is taken into the housing 11, the air pressure in the housing 11 rises and the interior of the housing 30 is cooled.

  The housing 11 further includes an exhaust pressure adjustment mechanism 113. The exhaust pressure adjusting mechanism 113 has a plurality of (three in the example of FIG. 1) exhaust ports 113a, 113b, and 113c that exhaust the air inside the housing 11 to the outside. The exhaust ports 113a to 113c are, for example, a card insertion port, a receipt discharge port, and a power supply exhaust port. Since the atmospheric pressure inside the automatic teller machine A is higher than the external atmospheric pressure, air leaks from the plurality of exhaust ports 113a to 113c. That is, the plurality of exhaust ports 113a to 113c generate an air flow F4 that exhausts the air inside the housing 11 to the outside.

  The 1st door sensor 14 is attached to the surface inside the housing | casing 11, for example. The first door sensor 14 detects whether the first door 111 is in an open state or a closed state. As a specific example, a case where the first door sensor 14 is a magnetic sensor and the first door 111 and the first door sensor 14 are provided with magnets will be described. In this case, the magnetic sensor detects whether or not the magnet provided on the first door 111 has approached the magnet of the first door sensor, so that the first door sensor 14 is open or closed. Detect whether it is in a state. The first door sensor 14 outputs a first door signal U5 indicating whether the first door 111 is in an open state or a closed state. The 2nd door sensor 15 is attached to the surface inside the housing | casing 11, for example. The second door sensor 15 detects whether the second door 112 is in an open state or a closed state. The second door sensor 15 outputs a second door signal U6 indicating whether the second door 112 is open or closed.

  The external air pressure sensor 16 is provided outside the housing 11. It is preferable that the external air pressure sensor 16 is provided in the vicinity of the fan 13 and at a position that is not significantly affected by the airflow F3 generated by the fan 13. The external air pressure sensor 16 is attached to, for example, the outer surface of the housing 11. The external air pressure sensor 16 detects a pressure (hereinafter referred to as an external air pressure Pe) outside the housing 11 (the automatic teller machine A) and outputs an external air pressure signal U1 indicating the value of the external air pressure Pe to the monitoring device 50.

  The internal pressure sensor 17 is provided inside the housing 11. The internal pressure sensor 17 is preferably provided in the vicinity of the fan 13 and at a position that is not significantly affected by the airflow F3 generated by the fan 13. The internal pressure sensor 17 is attached to, for example, the inner surface of the housing 11. The internal pressure sensor 17 detects a pressure value (hereinafter referred to as internal pressure Pi) inside the housing 11 (the automatic teller machine A) and outputs an internal pressure signal U2 indicating the value of the internal pressure Pi to the monitoring device 50. To do.

  The monitoring device 50 receives an external air pressure signal U1, an internal air pressure signal U2, a first door signal U5, and a second door signal U6. The monitoring device 50 generates an output signal U4 based on the external atmospheric pressure signal U1 and the internal atmospheric pressure signal U2. The monitoring device 50 determines whether or not to output the output signal U4 to the outside (external device B) based on the first door signal U5 and the second door signal U6. When the monitoring device 50 determines to output the output signal U4 to the outside, the monitoring device 50 transmits the output signal U4 to the external device 5 by wire or wirelessly. The monitoring device 50 may be realized by executing a predetermined program using a processor and other hardware. Details of the monitoring device 50 will be described later.

  The external device B notifies the user of the external device B of the degree of clogging of the filter 12 based on the output signal U4 from the monitoring device 50 by at least one of voice output, display of characters and pictures, and light of the light source. May be. The external device B determines that the filter 12 needs to be replaced or cleaned based on the output signal U4 from the monitoring device 50. The external device B uses at least one of audio output, display of characters and pictures, and light of the light source. The user of B may be notified.

  FIG. 2 is a block diagram showing details of the monitoring device 50 shown in FIG. The monitoring device 50 includes a differential pressure detection unit 51, a clogging degree calculation unit 52, an open / close determination unit 53, and an output control unit 54. The clogging degree calculation unit 52 may be simply referred to as a calculation unit 52 below.

  The differential pressure detector 51 receives the external air pressure signal U1 from the external air pressure sensor 16 and receives the internal air pressure signal U2 from the internal air pressure sensor 17. The differential pressure detector 51 calculates a differential pressure ΔP between the external air pressure Pe and the internal air pressure Pi based on the external air pressure signal U1 and the internal air pressure signal U2. For example, the differential pressure detection unit 51 obtains the differential pressure ΔP by subtracting the internal pressure Pi from the external pressure Pe.

  By generating the air flow F3, the air pressure inside the housing 11 increases. This increase in atmospheric pressure is expressed as intake pressure Ps. The intake pressure Ps takes a positive value when the air pressure inside the housing 11 is increased by the airflow F3. Due to the generation of the air flow F4, the atmospheric pressure inside the housing 11 decreases. This decrease in atmospheric pressure is expressed as exhaust pressure Px. The exhaust pressure Px takes a positive value when the air pressure inside the housing 11 decreases due to the airflow F4.

The external air pressure Pe, the internal air pressure Pi, the differential pressure ΔP, the intake pressure Ps, and the exhaust pressure Px have the relationship of the following formulas 1-3.
Internal pressure Pi = External pressure Pe + (Intake pressure Ps−Exhaust pressure Px) (Formula 1)
Differential pressure ΔP = External pressure Pe−Internal pressure Pi (Formula 2)
Differential pressure ΔP = − (Intake pressure Ps−Exhaust pressure Px) (Formula 3)

When the filter 12 is clogged, it becomes difficult for air to pass through the filter 12. For this reason, the airflow F3 becomes smaller as the filter 12 becomes clogged. As the air flow F3 decreases, the absolute value of the differential pressure ΔP decreases. Therefore, the relationship that the degree of clogging of the filter 12 is small when | ΔP | is large and the degree of clogging of the filter 12 is large when | ΔP | is small. Therefore, the following (Formula 4) is established.
δ = f (ΔP) (Formula 4)

  Here, “δ” indicates the degree of clogging of the filter 12 by foreign matter. Equation 4 is a function in which the value of the clogging degree δ increases as the absolute value of the differential pressure ΔP decreases. The function of Expression 4 may be obtained by using data obtained by actually measuring the clogging degree δ of the filter 12 every time the differential pressure ΔP changes by a predetermined value.

  The computing unit 52 computes the degree of clogging of the filter 12 using Equation 4. That is, the calculation unit 52 calculates the degree of clogging of the filter 12 by substituting the differential pressure ΔP (or the absolute value of the differential pressure ΔP) into Equation 4. The calculation unit 52 outputs an output signal U4 related to the degree of clogging of the filter 12. The output signal U4 is a signal indicating the degree of clogging of the filter 12 calculated by the calculation unit 52, for example.

  The calculation unit 52 may determine whether the calculated degree of clogging of the filter 12 is greater than or equal to a predetermined value. The predetermined value may be a value indicating the degree to which the filter 12 needs to be replaced or cleaned. The arithmetic unit 52 may output a signal indicating that the filter 12 needs to be replaced or cleaned as the output signal U4 when it is determined that the calculated degree of clogging of the filter 12 is equal to or greater than a predetermined value. Good.

  The open / close determining unit 53 receives the first door signal U5 from the first door sensor 14 and receives the second door signal U6 from the second door sensor 15. The open / close determining unit 53 determines whether or not the first door 111 is open based on the first door signal U5. The opening / closing determination unit 53 determines whether the second door 112 is open based on the second door signal U6. When the opening / closing determination unit 53 determines that at least one of the first door 111 and the second door 112 is open, it indicates that at least one of the first door 111 and the second door 112 is open. Output of the determination signal U7 shown is started. When it is determined that both the first door 111 and the second door 112 are closed, the opening / closing determination unit 53 stops the output of the determination signal U7. That is, the open / close determination unit 53 outputs the determination signal U7 during a period in which at least one of the first door 111 and the second door 112 is open. On the other hand, the open / close determining unit 53 stops outputting the determination signal U7 during a period in which both the first door 111 and the second door 112 are closed. Alternatively, when the open / close determining unit 53 determines that both the first door 111 and the second door 112 are closed, both the first door 111 and the second door 112 are closed as the determination signal U7. A signal indicating this may be output. In this case, the open / close determination unit 53 is in a state in which at least one of the first door 111 and the second door 112 is open during a period in which at least one of the first door 111 and the second door 112 is open. A determination signal U7 indicating this is output. On the other hand, the open / close determination unit 53 outputs a determination signal U7 indicating that both the first door 111 and the second door 112 are closed during a period in which both the first door 111 and the second door 112 are closed. To do.

  The output control unit 54 receives the output signal U4 from the calculation unit 52. The output control unit 54 receives the determination signal U <b> 7 from the open / close determination unit 53. The output control unit 54 determines whether at least one of the first door 111 and the second door 112 is open based on whether or not the determination signal U7 is received. Alternatively, the output control unit 54 indicates that the determination signal U7 indicates that at least one of the first door 111 and the second door 112 is open based on the content of the determination signal U7. Based on whether or not, it may be determined whether at least one of the first door 111 and the second door 112 is open. When the output control unit 54 determines that the doors 111 and 112 are in the closed state, the output control unit 54 permits the output of the output signal U4, and when it is determined that at least one of the doors 111 and 112 is in the open state. The output of the output signal U4 is prohibited. Specifically, when the output control unit 54 does not receive the determination signal U7 from the open / close determination unit 53, the output control unit 54 permits the output signal U4 to be output to the external device B (external). That is, the output control unit 54 outputs the output signal U4 to the external device B during a period in which the determination signal U7 is not received from the open / close determination unit 53. On the other hand, when the output control unit 54 receives the determination signal U7 from the opening / closing determination unit 53, the output control unit 54 prohibits the output signal U4 from being output to the external device B. That is, the output control unit 54 stops the output of the output signal U4 to the external device B during the period in which the determination signal U7 is received from the open / close determination unit 53. Alternatively, the output control unit 54 may permit the output signal U4 to be output to the external device B during the period when the determination signal U7 is a signal indicating that the doors 111 and 112 are closed. Good. Further, the output control unit 54 prohibits the output signal U4 from being output to the external device B during a period in which the determination signal U7 is a signal indicating that at least one of the doors 111 and 112 is open. Also good.

  FIG. 3 is a flowchart showing a specific example of the flow of processing by the monitoring device 50. First, the differential pressure detector 51 calculates a differential pressure ΔP between the external air pressure Pe and the internal air pressure Pi based on the external air pressure signal U1 and the internal air pressure signal U2 (step S1). Next, the calculation unit 52 calculates the clogging degree by substituting the obtained differential pressure ΔP into a function (expression 4) indicating the relationship between the differential pressure and the clogging degree, and relates to the clogging degree of the filter 12. A signal to be output is output (step S2). Next, the output control unit 54 determines whether at least one of the first door 111 and the second door 112 is open (step S3). When all of the doors 111 and 112 are closed (step S3: NO), the output control unit 54 permits the output of a signal (output signal U4) related to the degree of clogging of the filter 12 (step S4). . On the other hand, when at least one of the doors 111 and 112 is open (step S3: YES), the output control unit 54 prohibits output of a signal related to the degree of clogging of the filter 12 (step S5). With the above processing, the processing shown in FIG. 3 ends. While the monitoring device 50 is activated, the process shown in FIG. 3 is repeated.

  Advantages of the monitoring device 50 and the automatic teller machine A according to the first embodiment of the present invention will be described. In a state where the doors 111 and 112 are opened, airflows F1 and F2 flowing through openings formed by opening the doors 111 and 112 are generated. The atmospheric pressure inside the automatic teller machine A decreases due to the influence of the airflows F1 and F2. For this reason, regardless of the degree of clogging of the filter 12, the difference between the atmospheric pressure outside the housing 11 and the internal atmospheric pressure decreases. Therefore, when the doors 111 and 112 are opened, the correlation between the degree of clogging of the filter 12 and the difference between the atmospheric pressure outside the housing 11 and the internal atmospheric pressure is lost. Therefore, the value indicating the degree of clogging of the filter 12 calculated based on the value of the pressure difference obtained when the doors 111 and 112 are opened may not reflect the actual state of the degree of clogging of the filter 12. There is. Therefore, if a value related to the calculated value is output to the outside, the filter 12 may be misidentified as clogged. Here, according to the first embodiment of the present invention, the output control unit 54 outputs the output signal U4 related to the degree of clogging of the filter 12 when at least one of the doors 111 and 112 is open. Prohibit output to. Therefore, it is possible to prevent notification of erroneous information regarding clogging of the filter 12.

  As mentioned above, although the monitoring apparatus 50 and cash automatic teller machine A which concern on the 1st Embodiment of this invention were demonstrated with reference to FIGS. 1-3, unless it deviates from the summary of this invention, it is various in said structure. You can make changes.

  For example, in the first embodiment, two doors 111 and 112 are provided. However, the number of doors is not limited to two. The number of doors monitored by the monitoring device 50 may be one or three or more. As a specific example, the case where only the first door 111 among the doors 111 and 112 is a door that monitors the open / closed state will be described. In this case, the output control unit 54 permits the output of the output signal U4 when the first door 111 is in a closed state. On the other hand, the output control unit 54 prohibits the output of the output signal U4 when the first door 111 is in an open state.

(Second Embodiment)
FIG. 4 is a block diagram showing a monitoring device 50A according to the second embodiment of the present invention. The monitoring device 50A is different from the monitoring device 50 according to the first embodiment in that the monitoring device 50A includes a notification unit 55 and the output control unit 54 transmits an output signal U4 to the notification unit 55 instead of the external device B. . Among the configurations of the monitoring device 50A, the same components as those of the monitoring device 50 are denoted by the same reference numerals, and detailed description is omitted. The automatic teller machine including the monitoring device 50A is the same as the automatic teller machine A shown in FIG. 1 except that it is not connected to the external device B.

  The notification unit 55 includes at least one of a display, a speaker, and a light source. Based on the output signal U4 from the output control unit 54, the notification unit 55 notifies the degree of clogging of the filter 12 by at least one of sound output from the speaker, display of characters and pictures on the display, and lighting of the light source. Based on the output signal U4 from the output control unit 54, the notification unit 55 indicates that the filter 12 needs to be replaced or cleaned, that the speaker outputs sound, displays characters or pictures on the display, and turns on the light source. You may notify by at least one. According to the second embodiment of the present invention, the output control unit 54 notifies the notification unit 55 of the output signal U4 related to the degree of clogging of the filter 12 when at least one of the doors 111 and 112 is open. Prohibit output. Therefore, it is possible to prevent notification of erroneous information regarding clogging of the filter 12.

(Third embodiment)
FIG. 5 is a block diagram showing a monitoring device 50B according to the third embodiment of the present invention. Among the configurations of the monitoring device 50B, the same configurations as those of the monitoring device 50 according to the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The automatic teller machine including the monitoring device 50B is the same as the automatic teller machine A shown in FIG.

  The clogging degree calculation unit 52 determines the degree of clogging of the filter 12 that removes foreign substances contained in the gas sent by the fan 13 that sends the gas outside the casing 11 into the casing 11 and the atmospheric pressure outside the casing 11 and the casing. Calculation is performed based on the difference in atmospheric pressure inside the body 11, and an output signal U4 related to the calculated degree of clogging of the filter is output. The output control unit 54 permits the output signal U4 to be output when the doors 111 and 112 that partition the outside and the inside are closed. The output control unit 54 prohibits the output signal U4 from being output when any of the doors 111 and 112 is open.

  The embodiment of the present invention has been described above. Each of the monitoring devices 50 to 50B and the automatic teller machine A described above may have a computer system therein. The process described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing this program. Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  The program may realize part of the functions described above. Further, the program may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

Automatic teller machine A
External device B
Monitoring device 50-50B
Differential pressure detector 51
Clogging degree calculation unit 52
Open / close judgment unit 53
Output control unit 54
Notification unit 55

Claims (10)

The degree of clogging of the filter that removes foreign matters contained in the gas sent by the fan that sends the gas outside the machine to the inside of the machine is calculated based on the difference between the external atmospheric pressure and the internal atmospheric pressure. A calculation unit that outputs an output signal related to the degree of clogging of the filter,
An output control unit that permits output of the output signal when the door that partitions the exterior and the interior is closed, and prohibits output of the output signal when the door is open; ,
A monitoring device comprising: When a door signal indicating whether the door is open or closed is received from a door sensor, and the door signal indicates that the door is open An opening / closing determination unit that transmits a determination signal indicating that the door is open to the output control unit;
The monitoring apparatus according to claim 1, wherein the output control unit prohibits output of the output signal when the determination signal is received. The door includes a plurality of doors,
The output control unit permits the output of the output signal when all of the plurality of doors are in a closed state;
The output control unit prohibits output of the output signal when at least one of the plurality of doors is open;
The monitoring apparatus according to claim 1 or 2. The monitoring device according to claim 1, wherein the calculation unit outputs a signal indicating a degree of clogging of the filter as the output signal. The calculation unit determines whether the degree of clogging of the filter is a predetermined value or more,
The said calculating part outputs the signal which shows that the replacement | exchange or cleaning of the said filter is required as said output signal, when it determines with the clogging degree of the said filter being more than the said predetermined value. The monitoring device according to any one of the above. The monitoring device according to claim 5, further comprising a notification unit that notifies that the filter needs to be replaced or cleaned in response to receiving a signal indicating that the filter needs to be replaced or cleaned. .   An automatic teller machine comprising the monitoring device according to any one of claims 1 to 6. The fan;
The filter;
The automatic teller machine according to claim 7, further comprising: Calculate the degree of clogging of the filter that removes foreign substances contained in the gas sent by the fan that sends the gas outside the machine into the machine based on the difference between the external pressure and the internal pressure,
Output an output signal related to the calculated degree of filter clogging,
Permitting the output of the output signal when the door separating the exterior and the interior is closed;
Prohibiting the output of the output signal when the door is open;
Monitoring method including that. Calculate the degree of clogging of the filter that removes foreign substances contained in the gas sent by the fan that sends the gas outside the machine into the machine based on the difference between the external pressure and the internal pressure,
Output an output signal related to the calculated degree of filter clogging,
Permitting the output of the output signal when the door separating the exterior and the interior is closed;
Prohibiting the output of the output signal when the door is open;
A program that causes a computer to execute.

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