CN217443119U - Novel respirator respiratory resistance test device - Google Patents

Abstract

The utility model provides a novel respirator respiratory resistance testing arrangement, a serial communication port, include: the respirator comprises a machine shell, a head die and a differential pressure sensor, wherein the head die is arranged on a workbench of the machine shell in a swinging mode, and a respirator is worn on the face of the head die and forms a test space with the face; the shell is also provided with an air source interface, the air source interface is communicated with the test space through a first pipeline, the air source interface is communicated with the test space through a vacuum generator on a second pipeline, and one end of the differential pressure sensor is communicated with the test space. The utility model discloses the gas circuit structure is simpler, more convenient operation and maintenance, need not frequently switch over the running state of air pump during the operation to can ensure testing arrangement steady operation, in addition, the utility model discloses a different gestures when the respirator is worn to the head mould can the anthropomorphic dummy, thereby test the respiratory resistance of respirator under the different gestures.

Description

Novel respirator respiratory resistance test device

Technical Field

The utility model belongs to the technical field of the respirator test, specifically say so and relate to a novel respirator resistance to respiration test device.

Background

Respiratory protective articles mainly include two types, one is a filtering type respiratory protective article, which uses a filtering material to filter toxic and harmful substances in air, and converts polluted air into clean air for people to breathe, such as dust masks, gas masks and filtering gas masks. The other is an isolated respiratory protection product, which is based on the isolation principle, so that the respiratory organs, eyes and faces of people are isolated from the outside polluted air, and the air is supplied by using an air source carried by the people or clean air outside the polluted environment introduced by an air duct to ensure the normal respiration and respiratory protection of the people, and is also called an isolated gas mask, an oxygen-generating gas mask, a long-tube respirator, a diving mask and the like.

At present, in order to simulate the actual human body wearing state of a respiratory protection article as truly as possible, an inspiration pipeline system and an expiration pipeline system generally need to adopt a positive pressure air source and a negative pressure vacuum pump to be matched with each other, simulate the respiratory action of a human body, test the numerical value of the pipeline pressure change caused by the obstruction of the protective mask to air flow, and judge whether the air permeability of the mask is qualified or not. However, with such a structure, the operating states of the positive pressure air source and the negative pressure vacuum pump need to be changed continuously, the air pump and the whole pipeline system are prone to failure, and the stability of the instrument during operation is poor. In addition, the head model cannot simulate different postures in actual wearing, so that the breathing resistance of the respirator in different states cannot be effectively tested.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel respirator respiratory resistance test device, solved among the prior art the problem of the different gestures of testing arrangement structure complicacy fragile, when unable effective simulation worn the respirator.

The utility model provides a novel respirator respiratory resistance testing arrangement, a serial communication port, include: the respirator comprises a machine shell, a head die and a differential pressure sensor, wherein the head die is arranged on a workbench of the machine shell in a swinging mode, and a respirator is worn on the face of the head die and forms a testing space with the face; the shell is also provided with an air source interface, the air source interface is communicated with the test space through a first pipeline, the air source interface is communicated with the test space through a vacuum generator on a second pipeline, and one end of the differential pressure sensor is communicated with the test space.

The utility model discloses an in the embodiment, set up fixing support on the workstation, fixing support is connected with the head mould through joint bearing.

Preferably, the spherical plain bearing has an outer ring with an inner spherical surface fixed on the fixed support and an inner ring with an outer spherical surface connected with the head die through the connecting rod, the head die being detachably connected with the connecting rod.

Preferably, the head end of the first pipeline and the head end of the second pipeline are communicated with the first pipeline through a three-way joint, the tail end of the first pipeline and the tail end of the second pipeline are communicated with the tail pipeline through a three-way joint, and the tail pipeline extends to an airflow interface and a test interface outside the shell through the forward and reverse flow sensors.

Preferably, the workbench is also provided with a flow display connected with the forward and reverse flow sensors and a differential pressure display connected with the differential pressure sensor.

Preferably, the head die is provided with a breathing channel and a testing channel which penetrate through the face of the head die and are communicated with the inside and the outside of the testing space, the airflow interface is communicated with the breathing channel outside the testing space, one end of the differential pressure sensor is communicated with the testing space through the testing channel outside the testing space, and the other end of the differential pressure sensor is communicated with the last pipeline through the testing interface.

Preferably, the first pipeline is sequentially provided with a first pressure regulating valve for regulating air pressure and a first flow regulating valve for regulating flow, and the workbench is provided with a first pressure regulating knob connected with the first pressure regulating valve, a first flow regulating knob connected with the first flow regulating valve, and a first pressure display meter for displaying pressure of the first pipeline.

Preferably, the second pipeline is sequentially provided with a second pressure regulating valve for regulating air pressure and a second flow regulating valve for regulating flow, and the workbench is provided with a second pressure regulating knob connected with the second pressure regulating valve, a second flow regulating knob connected with the second flow regulating valve, and a second pressure display meter for displaying the pressure of the second pipeline.

Preferably, the workbench is further provided with a first on-off valve for controlling the on-off of the first pipeline and a second on-off valve for controlling the on-off of the second pipeline.

Preferably, the device further comprises a controller, and the first on-off valve, the second on-off valve, the first flow regulating valve, the first pressure regulating valve, the second flow regulating valve, the second pressure regulating valve, the forward and reverse flow sensor, the differential pressure sensor, the first pressure display meter and the second pressure display meter are all electrically connected with the controller.

The utility model discloses set up vacuum generator in the second pipeline, can change the positive pressure gas source into the negative pressure very easily and conveniently, compare in current device, the utility model discloses a gas circuit structure is simpler, more convenient operation and maintenance, does not need the running state of frequent switching air pump during operation to can ensure testing arrangement steady operation, in addition, the utility model discloses a different gestures when the respirator is worn to the head model can the anthropomorphic dummy, thereby test the respiratory resistance of respirator under the different gestures.

Drawings

Fig. 1 is an elevation view of the overall structure of the testing device in the embodiment of the present invention.

Fig. 2 is a side sectional view of a head die according to an embodiment of the present invention.

Fig. 3 is a schematic view of the gas flow according to the embodiment of the present invention.

Wherein the reference numerals are: 10. a housing; 11. a work table; 12. an air source interface; 13. fixing a support; 14. a knuckle bearing; 15. a connecting rod; 16. an air flow interface; 17. a test interface; 181. a first pressure regulating knob; 182. a first flow adjustment knob; 183. a first pressure display gauge; 184. a second pressure regulating knob; 185. a second flow adjustment knob; 186. a second pressure display gauge; 187. a first on-off valve; 188. A second on-off valve; 191. a flow display; 192. a differential pressure display; 20. a head die; 21. a breathing passage; 22. a test channel; 30. a respirator; 40. a test space; 41. a first pipeline; 411. a first pressure regulating valve; 412. a first flow regulating valve; 42. a second pipeline; 421. a second pressure regulating valve; 422. a second flow regulating valve; 43. a vacuum generator; 44. a first pipeline; 45. a last pipeline; 46. a forward and reverse flow sensor; 47. a differential pressure sensor.

Detailed Description

In order to more clearly illustrate the technical features of the present invention, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Fig. 1 is a front view of an overall structure diagram of a testing device according to an embodiment of the present invention. Fig. 2 is a side sectional view of a head die according to an embodiment of the present invention. Fig. 3 is a schematic view of the gas flow according to the embodiment of the present invention.

Referring to fig. 1 to 3, the present invention provides a novel respirator respiratory resistance testing device, a respirator respiratory resistance testing device, comprising: the device comprises a machine shell 10, a head die 20 and a differential pressure sensor 47, wherein the head die 20 is arranged on a workbench 11 of the machine shell 10 in a swinging mode, and a respirator 30 is worn on the face of the head die 20 and forms a test space 40 together with the face; the casing 10 is further provided with an air source interface 12, the air source interface 12 is communicated with the test space 40 through a first pipeline 41, the air source interface 12 is communicated with the test space 40 through a vacuum generator 43 on a second pipeline 42, and one end of a differential pressure sensor 47 is communicated with the test space 40.

Wherein, the vacuum generator 43 is a novel, efficient, clean, economical, small vacuum component that utilizes a positive pressure gas source to generate negative pressure, which makes it very easy and convenient to obtain negative pressure in a place with compressed air or a place that needs positive and negative pressure in a pneumatic system. The vacuum pump is a machine for pumping gas, the suction inlet of which forms negative pressure, the exhaust outlet of which is directly communicated with the atmosphere and the pressure ratio of two ends of which is very large. The vacuum generator 43 is a pneumatic element that forms a certain vacuum degree by utilizing the flow of compressed air, and compared with a vacuum pump, it has simple structure, small volume, light weight, low price, convenient installation, easy combination with a matching set, quick generation and release of vacuum, and is suitable for intermittent work with small flow, and is suitable for scattered use.

The utility model discloses set up vacuum generator 43 in second pipeline 42, can change the positive pressure gas source into the negative pressure very easily and conveniently, compare in current device, the utility model discloses a gas circuit structure is simpler, more convenient operation and maintenance, does not need the running state of frequent switching air pump during the operation to can ensure testing arrangement steady operation, in addition, the utility model discloses a different gestures when respirator is worn to head model 20 can the anthropomorphic dummy, thereby test the respiratory resistance of respirator 30 under the different gestures.

Referring to fig. 1 and 2, in an embodiment of the present invention, a fixing support 13 is disposed on the work table 10, and the fixing support 13 is connected to the head die through a joint bearing 14. The spherical plain bearing 14 has a sliding contact surface of an inner spherical surface and an outer spherical surface, can rotate and swing at any angle during movement, and is manufactured by adopting a plurality of special processing methods such as surface phosphating, blasting, padding and spraying. The oscillating bearing 14 has the characteristics of large load capacity, impact resistance, corrosion resistance, wear resistance, self-aligning, good lubrication and the like.

Referring to fig. 1 and 2, the spherical plain bearing 14 has an outer race having an inner spherical surface fixed to the fixed support 13 and an inner race having an outer spherical surface connected to the head die 20 through the connecting rod 15. Specifically, it may be provided that the outer ring of the joint bearing 14 is welded to the fixed support, the inner ring of the joint bearing 14 is welded to the end of the connecting rod 15, or the joint bearing 14 is integrally formed with the connecting rod 15.

Referring to fig. 1 and 2, in the present invention, a head mold 20 is detachably coupled to the connecting rod 15. Specifically, a screw thread may be provided at the end of the connecting rod 15, and the connecting rod 15 and the head die 20 may be detachably connected by the screw thread, or may be detachably connected by a snap connection, a bolt connection, or the like. The snap connection and the bolt connection are common connection modes in the field and are not described in detail. Can dismantle the connection and can conveniently change head die 20, the utility model discloses a testing arrangement can adapt S, M, L the silica gel head die of three kinds of different models to respiratory resistance state when respirator 30 is worn to the head that can simulate not unidimensional, perhaps can choose for use the head die 20 of laminating most with respirator 30 shape, thereby can accurately measure respirator 30's respiratory resistance. In one embodiment, the breathing resistance of the mask may be tested by the operator wearing the mask over the face of the headform 20, clasping the nose clip, fitting the face and chin, and then activating the test device to simulate the person's breathing.

Referring to fig. 3, in the embodiment of the present invention, the head end of the first pipeline 41 and the head end of the second pipeline 42 are communicated with the first pipeline 44 through a three-way joint, the end of the first pipeline 41 and the end of the second pipeline 42 are communicated with the last pipeline 45 through a three-way joint, and the last pipeline extends to the air flow interface 16 and the test interface 17 outside the casing 10 through the forward and reverse flow sensor 46. The forward and reverse flow sensors 46 can measure flow in two different states of inspiration and expiration, the number of the forward and reverse flow sensors 46 can be reduced, the gas path structure is simplified, cost is reduced, and maintenance is facilitated.

Referring to fig. 2, in the embodiment of the present invention, the head mold 20 is provided with a breathing passage 21 penetrating the head mold surface and communicating with the inside and the outside of the testing space 40, and the airflow interface 16 communicates with the breathing passage 21 outside the testing space 40. The air flow interface 16 is communicated with the breathing passage 21 through an air pipe which is arranged outside the testing space 40, so that the air pipe can be prevented from influencing the air tightness of the respirator 30 and the face of the head die 20, and the testing result is more accurate.

Referring to fig. 2, in order to bring the test results closer to the actual state of the person using the respirator, a breathing passage 21 is generally provided through to the oronasal position of the headpiece 20.

Referring to fig. 3, in the embodiment of the present invention, the head mold 20 is provided with a testing channel 22 penetrating the face of the head mold 20 and communicating the interior and the exterior of the testing space 40, one end of the differential pressure sensor 47 is communicated with the testing space 40 through the testing channel 22 outside the testing space 40, and the other end of the differential pressure sensor 47 is communicated with the end pipeline 45 through the testing interface 17. The differential pressure sensor 47 is arranged outside the testing space 40, so that the differential pressure sensor 47 can be prevented from influencing the air tightness of the respirator 30 and the face of the head die 20, and the testing result is more accurate.

Referring to FIG. 2, in order to bring the test results closer to the actual situation when a person is using the respirator, the test channel 22 is typically provided through to the oronasal location of the headpiece 20.

Referring to fig. 1 and 3, in an embodiment of the present invention, a first pressure regulating valve 411 for regulating air pressure and a first flow regulating valve 412 for regulating flow are sequentially disposed on the first pipeline 41, a first pressure regulating knob 181 connected to the first pressure regulating valve 411, a first flow regulating knob 182 connected to the first flow regulating valve 412, and a first pressure display gauge 183 displaying first pipeline pressure are disposed on the workbench. The second pipe 42 is sequentially provided with a second pressure regulating valve 421 for regulating the air pressure and a second flow rate regulating valve 422 for regulating the flow rate, and the table 11 is provided with a second pressure regulating knob 184 connected to the second pressure regulating valve 421, a second flow rate regulating knob 185 connected to the second flow rate regulating valve 422, and a second pressure display gauge 186 for displaying the pressure in the second pipe 42. In the present invention, a first on-off valve 187 for controlling on-off of the first pipeline 41 and a second on-off valve 188 for controlling on-off of the second pipeline 42 are further provided on the table 11. The worktable 11 is also provided with a flow display 191 connected with the forward and reverse flow sensor 46 and a differential pressure display 192 connected with the differential pressure sensor.

The stepless and accurate adjustment can be achieved by adjusting the flow and pressure in the first and second lines 41 and 42 in the form of knobs, and the flow display 191, which displays the flow in the lines in a digital form, can accurately display the flow. So that the flow in the line can be accurately adjusted to the predetermined requirements. The utility model discloses a pressure differential display 192 comes direct display pressure differential numerical value, compares in the instrument can show the test result more accurately.

In an embodiment of the present invention, the flow display 191 may display the flow values in two different directions, namely, the forward direction and the reverse direction.

Referring to fig. 1 and 3, in actual use, when the resistance of exhalation needs to be tested, the first flow rate adjustment valve 412 should be adjusted to be in a clockwise screwing (closing) state, the first on-off valve 187 should be set to be in a vertical (closing) state, the air flow port 16 should be connected to the inhalation port 212 of the breathing passage 21 using a silicone bellows breathing tube, and the test port 17 of the housing 10 should be connected to the test port 221 of the test passage 22 of the head mold 20 using a silicone piezometer tube. The exhalation port 211 of the breathing passage 21 of the head mold 20 should be sealed with a silicone cap. Then, the pressure of the air source is adjusted to be equal to or more than 0.6MPa by operating the first pressure adjusting valve 411 until the first pressure display gauge 183 displays that the pressure is equal to or more than 0.6MPa, then the respirator 30 needs to be worn on the head model 20, the head harness is adjusted to be in a normal tightness state, the periphery of the respirator 30 and the head model 20 are subjected to air tight treatment, the first air flow cut-off valve 187 is opened, the first flow adjusting knob 412 is adjusted until the flow display 191 stably displays the preset flow (such as 30L/min, 85L/min and 95L/min), and then the indication value of the pressure difference display 192 is read, namely the exhalation resistance value.

Referring to fig. 1 and 3, in actual use, when resistance during inhalation needs to be tested, the second flow regulating valve 422 should be adjusted to be in a clockwise screwing (closing) state, the second shut-off valve 188 should be set to be in a vertical (closing) state, the air flow port 16 should be connected with the exhalation port 211 of the breathing passage 21 by using a silicone bellows, and the test port 17 should be connected with the test port 221 of the test passage 22 of the head mold 20 by using a silicone piezometer tube. The inhalation interface 212 of the breathing passage 21 of the head die 20 should be sealed with a silicone cap. Then, the pressure of the air source is adjusted to 0.2 to 0.3MPa displayed by the second pressure display meter 186 by operating the second pressure adjusting valve 421, then the respirator 30 is worn on the head model 20, the head is adjusted to be in a normal tightness state, the periphery of the respirator 30 and the head model 20 are subjected to air tight treatment, the second air flow shutoff valve 188 is opened, the second flow adjusting knob 422 is adjusted until the flow display 191 stably displays the required flow (such as-30L/min, -85L/min, -95L/min), and then the indication value of the differential pressure display 192 is read, namely the inhalation resistance value.

Referring to fig. 1, in actual use, a compressed air source is connected to the air source interface 12 and air tightness is ensured. The air which is reduced in volume and improved in pressure by the mechanical work of the air compressor is called compressed air, and the compressed air is an important power source. Compared with other energy sources, the compressed air is convenient to convey, has no special harmful performance, has no fire danger, is not afraid of overload, and can work in a plurality of adverse environments. Of course, the utility model discloses also can use suction formula air supplies such as vacuum pump as the power supply of tester.

The utility model discloses an in the embodiment, the compressed air supply requires: the pressure is more than or equal to 0.6MPa, and the flow is more than or equal to 200L/min. In practical application, the used compressed air source needs to be subjected to oil-water separation and particulate matter filtration so as to avoid damaging elements such as a pressure display meter and the like. When connecting the compressed air source to the air source interface 12, air tightness needs to be ensured.

Referring to fig. 1 and 2, in an embodiment of the invention, before the test is performed. The position of the head model 20 may be swung in various directions, such as forward facing, vertically upward, vertically downward, left side lying, right side lying, etc., according to the standard, and the exhalation and inhalation resistances may be recorded according to the above-described test after the swing.

It is worth noting that in order to avoid damaging the testing device, the operator should pay attention to checking the status of each pipe connection and control valve before testing; during the test process, the breathing pipeline is not required to be pinched and blocked by hands or other articles, so that the pressure difference is prevented from exceeding the measuring range.

In order to ensure the accuracy of the test, the device needs to be calibrated periodically, and before restarting after long-term non-use, the device also needs to be calibrated.

The embodiment of the present invention provides a testing device, which further comprises a controller, wherein the first on-off valve 187, the second on-off valve 188, the first flow regulating valve 412, the first pressure regulating valve 411, the second flow regulating valve 422, and the second pressure regulating valve 421 are electrically operated valves, all electrically operated valves, the forward and reverse flow sensor 46, the differential pressure sensor 47, the first pressure display meter 183, and the second pressure display meter 186 are electrically connected to the controller, and a power switch for controlling the on-off of the electrical connection is further disposed on the working table 11. Therefore, the electric valve can be automatically adjusted to reach a preset value through a preset control program, and automatic testing is carried out.

The testing device is started up by connecting a 220V power supply, the forward and reverse flow sensor 46 and the differential pressure sensor 47 are preheated for two minutes, at the moment, the flow display 191 displays that the pressure should be (0 +/-0.5) L/min, and the differential pressure display 192 displays that the pressure should be (0 +/-2) Pa.

Wherein, the differential pressure sensor 47, the forward and reverse flow sensor 46, the first pressure display gauge 183, the second pressure display gauge 184 and the like all adopt advanced inlet elements, which are the prior art and the working principle of the differential pressure sensor is not repeated, and the pressure adjusting range of the compressed air is 0.1-0.6 Mpa; the measuring range of the forward and reverse flow sensor is 0-300L/min; the precision is 2.0%; the measuring range of the differential pressure sensor is +/-500 Pa/+/-750 Pa; the accuracy was 1% F.S.

The technical features that the utility model has not been described can be realized through or adopt prior art, and no longer give unnecessary details here, and of course, the above-mentioned explanation is not right the utility model discloses a restriction, the utility model discloses also not only be limited to the above-mentioned example, ordinary skilled person in this technical field is in the utility model discloses a change, modification, interpolation or replacement made in the essential scope also should belong to the utility model discloses a protection scope.

Claims (10)

1. A respirator respiratory resistance testing device, comprising: the respirator comprises a machine shell, a head die and a differential pressure sensor, wherein the head die is arranged on a workbench of the machine shell in a swinging mode, and the respirator is worn on the face of the head die and forms a test space with the face;

the shell is also provided with an air source interface, the air source interface is communicated with the test space through a first pipeline, the air source interface is communicated with the test space through a vacuum generator on a second pipeline, and one end of the differential pressure sensor is communicated with the test space.

2. The respirator respiratory resistance testing device of claim 1, wherein a fixed support is arranged on the workbench and is connected with the head die through a joint bearing.

3. The respirator respiratory resistance testing device of claim 2, wherein the spherical plain bearing has an outer race with an inner spherical surface that is fixed to the fixed support and an inner race with an outer spherical surface that is connected to the head die by a connecting rod, the head die being detachably connected to the connecting rod.

4. The respirator respiratory resistance testing device of claim 1, wherein the head end of the first pipeline and the head end of the second pipeline are communicated with the head pipeline through a three-way joint, the tail end of the first pipeline and the tail end of the second pipeline are communicated with the tail pipeline through a three-way joint, and the tail pipeline extends to the air flow interface and the testing interface outside the shell through the forward and reverse flow sensors.

5. The respirator respiratory resistance testing device of claim 4, wherein the workbench is further provided with a flow display connected with the forward and reverse flow sensors and a differential pressure display connected with the differential pressure sensor.

6. The respirator respiratory resistance testing device of claim 4, wherein the head die is provided with a breathing passage and a testing passage which penetrate the face part of the head die and are communicated with the inside and the outside of the testing space, the airflow interface is communicated with the breathing passage outside the testing space, one end of the differential pressure sensor is communicated with the testing space through the testing passage outside the testing space, and the other end of the differential pressure sensor is communicated with the tail pipeline through the testing interface.

7. The respirator respiratory resistance testing device of claim 4, wherein the first pipeline is sequentially provided with a first pressure regulating valve for regulating air pressure and a first flow regulating valve for regulating flow, and the workbench is provided with a first pressure regulating knob connected with the first pressure regulating valve, a first flow regulating knob connected with the first flow regulating valve, and a first pressure display meter for displaying the pressure of the first pipeline.

8. The respirator respiratory resistance testing device of claim 7, wherein the second pipeline is sequentially provided with a second pressure regulating valve for regulating air pressure and a second flow regulating valve for regulating flow, and the workbench is provided with a second pressure regulating knob connected with the second pressure regulating valve, a second flow regulating knob connected with the second flow regulating valve, and a second pressure display meter for displaying the pressure of the second pipeline.

9. The respirator respiratory resistance testing device of claim 8, wherein the workbench is further provided with a first on-off valve for controlling on-off of the first pipeline, and a second on-off valve for controlling on-off of the second pipeline.

10. The respirator respiratory resistance testing device of claim 9, further comprising a controller, wherein the first on-off valve, the second on-off valve, the first flow regulating valve, the first pressure regulating valve, the second flow regulating valve, the second pressure regulating valve, the forward and reverse flow sensor, the differential pressure sensor, the first pressure indicator gauge, and the second pressure indicator gauge are all electrically connected to the controller.

Images