Multi-parameter flow transmitter

Abstract

The utility model discloses a multi-parameter flow transmitter, which comprises a multi-parameter flow transmitter body and a redundant power supply module, and the redundant power supply module comprises a main power supply unit, a standby power supply unit, a power failure detection module, a power supply switching module, a voltage conversion module and a power supply port, the power supply output ends of the main power supply unit and the standby power supply unit are connected with the input end of the voltage conversion module through the power supply switching module, the output end of the voltage conversion module is connected with the power supply port, and the power supply output ends of the main power supply unit and the standby power supply unit are further connected with the signal input end of the power failure detection module. The signal output end of the power failure detection module is connected with the detection signal input end of the power switching module, and the power supply port is used for supplying power to the multi-parameter flow transmitter body. According to the utility model, the power supply unit of the multi-parameter flow transmitter body can be automatically switched according to the detection result of the power failure detection module, so that the uninterrupted power supply to the multi-parameter flow transmitter body is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of flow detection, in particular to a multi-parameter flow transmitter. Background Art

[0002] Flow transmitter is also called flow sensor, or flow meter for short. Multi-parameter flow transmitter is an instrument that can measure multiple parameters at the same time and convert them into standard electrical signal output. It can usually measure multiple parameters such as flow, pressure, temperature, etc. of the fluid, and transmit these measured values ​​in a unified signal form (such as current, voltage signal). This transmitter has the characteristics of high precision, high stability and reliability.

[0003] Multi-parameter flow transmitters are widely used in the field of industrial automation control. For example, in the petrochemical, electric power, metallurgy, water treatment and other industries, they can provide accurate data support for process control, metering and settlement, etc., which helps to achieve the optimization and efficient operation of the production process.

[0004] Existing multi-parameter flow transmitters usually use a single power supply mode of AC power supply or battery power supply. When the AC power is off or the battery power is too low, the multi-parameter flow transmitter is in a power-off state, and thus it is impossible to ensure uninterrupted power supply to the multi-parameter flow transmitter. During the power-off period, the flow cannot be measured normally, resulting in the loss of measurement data, which may affect the accuracy of process control or measurement settlement data.

[0005] Therefore, how to achieve uninterrupted power supply for multi-parameter flow transmitters is a problem that needs to be solved urgently. Utility Model Content

[0006] In view of the defects in the prior art, the utility model aims to provide a multi-parameter flow transmitter capable of achieving uninterrupted power supply.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] The utility model provides a multi-parameter flow transmitter, comprising a multi-parameter flow transmitter body and a redundant power supply module, wherein the redundant power supply module comprises a main power supply unit, a backup power supply unit, a power failure detection module, a power supply switching module, a voltage conversion module and a power supply port, wherein:

[0009] The power supply output ends of the main power supply unit and the backup power supply unit are respectively connected to the input end of the voltage conversion module through the power switching module, and the output end of the voltage conversion module is connected to the power supply port. The power supply output ends of the main power supply unit and the backup power supply unit are also connected to the signal input end of the power-off detection module, and the signal output end of the power-off detection module is connected to the detection signal input end of the power switching module. The power supply port is used to power the multi-parameter flow transmitter body.

[0010] Preferably, the main power supply unit includes a mains input interface, a step-down transformer, a rectifier circuit and a filter circuit connected in sequence, the mains input interface is used to connect to a mains power supply, and the output end of the filter circuit is connected to the first power input end of the power switching module.

[0011] Preferably, the backup power supply unit comprises a battery, and the battery is connected to the second power input terminal of the power switching module.

[0012] Preferably, the battery is a rechargeable lithium battery.

[0013] Preferably, the backup power supply unit further includes a charge and discharge controller, the output ends of the storage battery and the filter circuit are respectively connected to the charge and discharge controller, and the charge and discharge controller is connected to the second power input end of the power switching module.

[0014] Preferably, the power switching module is an STS static transfer switch.

[0015] Preferably, the power switching module includes a first relay, a second relay and a switching control module, wherein:

[0016] One end of the coil of the first relay is connected to the first output end of the switching control module, and the other end of the coil of the first relay is grounded;

[0017] One end of the coil of the second relay is connected to the second output end of the switching control module through the normally closed contact of the first relay, and the other end of the coil of the second relay is grounded;

[0018] The output end of the power failure detection module is connected to the input end of the switching control module;

[0019] The power supply output terminal of the main power supply unit is connected to the input terminal of the voltage conversion module through the normally open contact of the first relay and the normally closed contact of the second relay connected in series;

[0020] The power supply output terminal of the backup power supply unit is connected to the input terminal of the voltage conversion module through the normally open contact of the second relay.

[0021] Preferably, the power-off detection module comprises a first resistor, a second resistor, a third resistor and a power-off detection chip, wherein:

[0022] The first end of the first resistor is connected to the power supply output ends of the main power supply unit and the backup power supply unit, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is grounded, the input end of the power-off detection chip is connected to the second end of the first resistor, and the output end of the power-off detection chip is connected to the detection signal input end of the power switching module through the third resistor as the signal output end of the power-off detection module.

[0023] Preferably, the redundant power supply module also includes a backflow prevention diode and a super capacitor, the positive pole of the backflow prevention diode is connected to the output end of the power switching module, the negative pole of the backflow prevention diode is connected to the input end of the voltage conversion module, the first end of the super capacitor is connected to the negative pole of the backflow prevention diode, and the second end of the super capacitor is grounded.

[0024] Preferably, the multi-parameter flow transmitter body includes a pressure sensor, a temperature sensor, a differential pressure transmitter, a signal conditioning circuit, an MCU controller, a communication module, a display module, a clock module, a memory and a key module.

[0025] The output ends of the pressure sensor and the temperature sensor are respectively connected to the input end of the signal conditioning circuit, and the output end of the signal conditioning circuit, the differential pressure transmitter, the communication module, the display module, the clock module, the memory and the key module are respectively connected to the MCU controller.

[0026] Beneficial effects of the utility model:

[0027] The utility model sets a redundant power supply module composed of a main power supply unit, a backup power supply unit, a power failure detection module, a power switching module, a voltage conversion module and a power supply port. The power failure detection module detects the voltages of the main power supply unit and the backup power supply unit in real time. When a power supply unit currently supplying power to the multi-parameter flow transmitter body fails, the power switching module switches the current power supply unit to another power supply unit to supply power to the multi-parameter flow transmitter body, thereby ensuring uninterrupted power supply to the multi-parameter flow transmitter body and avoiding the loss of metering data due to power failure. The utility model can be applicable to multi-parameter flow transmitters of differential pressure type, electromagnetic type, volumetric type, ultrasonic type, vortex type and other types.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0030] Figure 1 This is a circuit principle block diagram of a multi-parameter flow transmitter in one embodiment of the utility model;

[0031] Figure 2 It is a circuit schematic diagram of a redundant power supply module in one embodiment of the utility model. DETAILED DESCRIPTION

[0032] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0033] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which the utility model belongs.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0035] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] like Figure 1-2 As shown, this embodiment provides a multi-parameter flow transmitter, which includes a multi-parameter flow transmitter body 1 and a redundant power supply module 2, the redundant power supply module 2 includes a main power supply unit 21, a backup power supply unit 22, a power failure detection module 23, a power switching module 24, a voltage conversion module 25 and a power supply port 26, wherein,

[0039] The power output ends of the main power supply unit 21 and the backup power supply unit 22 are respectively connected to the input end of the voltage conversion module 25 through the power switching module 24, and the output end of the voltage conversion module 25 is connected to the power supply port 26. The power output ends of the main power supply unit 21 and the backup power supply unit 22 are also connected to the signal input end of the power failure detection module 23, and the signal output end of the power failure detection module 23 is connected to the detection signal input end of the power switching module 24. The voltage conversion module 25 is used to convert the voltage output by the main power supply unit 21 and the backup power supply unit 22 into the working voltage of the multi-parameter flow transmitter body 1, and the power supply port 26 is used to power the multi-parameter flow transmitter body 1.

[0040] The multi-parameter flow transmitter of this embodiment is provided with a redundant power supply module 2 consisting of a main power supply unit 21, a backup power supply unit 22, a power failure detection module 23, a power switching module 24, a voltage conversion module 25 and a power supply port 26. During the operation of the multi-parameter flow transmitter, the output voltages of the redundantly set main power supply unit 21 and the backup power supply unit 22 are detected in real time by the power failure detection module 23. When the power failure detection module 23 detects that the power supply unit currently supplying power to the multi-parameter flow transmitter body 1 fails (the output voltage is lower than the preset voltage), the power switching module 24 automatically switches the current power supply unit to another power supply unit to supply power to the multi-parameter flow transmitter body 1, thereby ensuring uninterrupted power supply to the multi-parameter flow transmitter body 1 and avoiding the loss of metering data due to power failure. The multi-parameter flow transmitter can be applied to differential pressure type, electromagnetic type, volumetric type, ultrasonic type, vortex type and other types of multi-parameter flow transmitters.

[0041] like Figure 2 As shown, in one embodiment, the main power supply unit 21 includes a mains input interface 211, a step-down transformer 212, a rectifier circuit 213 and a filter circuit 214 connected in sequence, the mains input interface 211 is used to connect the mains power supply, and the output end of the filter circuit 214 is connected to the first power input end of the power switching module 24. In this embodiment, the main power supply unit 21 is powered by the mains, which is convenient to obtain electricity and more stable and reliable. The mains input interface 211 through which the 220V AC power of the mains is connected to the main power supply unit 21 of the multi-parameter flow transmitter, and the 220V AC power is stepped down by the step-down transformer 212, rectified by the rectifier circuit 213 and filtered by the filter circuit 214 in sequence, and then the stable low-voltage DC power is output through the power switching module 24 to power the multi-parameter flow transmitter body 1. Under normal conditions, the main power supply unit 21 can be used to power the multi-parameter flow transmitter body 1.

[0042] like Figure 2 As shown, in one embodiment, the backup power supply unit 22 includes a battery 221, and the battery 221 is connected to the second power input terminal of the power switching module 24. In this embodiment, the backup power supply unit 22 is powered by the battery 221. When the main power supply unit 21 fails (such as a power outage), the battery 221 of the backup power supply unit 22 is used to temporarily power the multi-parameter flow transmitter body 1 to avoid loss of metering data. Specifically, the battery 221 is a rechargeable lithium battery, which has a higher energy density, a relatively small volume, and a long service life.

[0043] like Figure 2As shown, in one embodiment, the backup power supply unit 22 also includes a charge and discharge controller 222, and the output ends of the storage battery 221 and the filter circuit 214 are respectively connected to the charge and discharge controller 222, and the charge and discharge controller 222 is connected to the second power input end of the power switching module 24. The charging and discharging of the storage battery 221 is controlled by the charge and discharge controller 222. When the main power supply of the main power supply unit 21 is normal and the power of the storage battery 221 is lower than the set value, the charge and discharge controller 222 controls the main power supply unit 21 to charge the storage battery 221. It should be noted that the backup power supply unit 22 can also use other renewable clean energy such as solar power supply, wind power generation power supply, etc. according to needs and site conditions, and the utility model does not make specific restrictions on this.

[0044] like Figure 1 As shown, in one embodiment, the power switching module 24 is an STS static transfer switch. The STS static transfer switch can automatically switch the power supply unit for the multi-parameter flow transmitter body 1 from the current power supply unit (such as the main power supply unit 211) to another power supply unit (such as the backup power supply unit 22) when the current power supply unit fails, so as to realize the uninterrupted power conversion of the dual redundant power supply. The STS (Static Transfer Switch) is mainly composed of an intelligent control panel, a high-speed thyristor and a circuit breaker, and its standard switching time is ≤8ms, which will not cause the multi-parameter flow transmitter body 1 to be powered off. It can not only reliably supply power to the multi-parameter flow transmitter body 1, but also ensure the safety of the STS when switching between different power supplies.

[0045] like Figure 2 As shown, in one embodiment, the power switching module 24 includes a first relay, a second relay and a switching control module 241, wherein:

[0046] One end of the coil KA11 of the first relay is connected to the first output end of the switching control module 241, and the other end of the coil KA11 of the first relay is grounded;

[0047] One end of the coil KA21 of the second relay is connected to the second output end of the switching control module 241 through the normally closed contact KA12 of the first relay, and the other end of the coil KA21 of the second relay is grounded;

[0048] The output end of the power failure detection module 23 is connected to the input end of the switching control module 241;

[0049] The power supply output terminal of the main power supply unit 21 is connected to the input terminal of the voltage conversion module 25 through the normally open contact KA13 of the first relay and the normally closed contact KA22 of the second relay connected in series;

[0050] The power supply output terminal of the backup power supply unit 22 is connected to the input terminal of the voltage conversion module 25 through the normally open contact KA23 of the second relay.

[0051] Specifically, in this embodiment, a power switching module 24 using dual relays as switching power sources has simple wiring, low cost, reliable control and high safety. Specifically, under normal conditions, the main power supply unit 21 is used for power supply. At this time, the switching control module 241 controls the first output terminal connected to the coil KA11 of the first relay to output a preset voltage so that the coil KA11 of the first relay is energized, and then the normally open contact KA13 of the first relay is closed, and the normally closed contact KA12 of the first relay is disconnected, so that the main power supply unit 21 is connected to the power supply port 26 to provide power for the multi-parameter flow transmitter body 1. During the power supply process, the power supply status of the main power supply unit 21 is detected in real time by the power failure detection module 23 and transmitted to the switching control module 241; when the power failure detection module 23 detects that the main power supply unit 21 has a fault (such as a power outage), The switching control module 241 controls the control end connected to the coil KA11 of the first relay to not output voltage, so that the coil KA11 of the first relay loses power, then the normally closed contact KA12 of the first relay is closed, and the normally open contact KA13 of the first relay is disconnected, so that the connection between the main power supply unit 21 and the power supply port 26 is disconnected. At the same time, the switching control module 241 controls the second output end connected to the coil KA21 of the second relay to output a preset voltage, so that the coil KA21 of the second relay is energized, then the normally open contact KA23 of the second relay is closed, so that the backup power supply unit 22 is connected to the power supply port 26 to provide power for the multi-parameter flow transmitter body 1.

[0052] like Figure 2 As shown, in one embodiment, the power-off detection module 23 includes a first resistor 231, a second resistor 232, a third resistor 233 and a power-off detection chip 234, wherein:

[0053] The first end of the first resistor 231 is connected to the power supply output ends of the main power supply unit 21 and the backup power supply unit 22, the second end of the first resistor 231 is connected to the first end of the second resistor 232, the second end of the second resistor 232 is grounded, the input end of the power-off detection chip 234 is connected to the second end of the first resistor 231, and the output end of the power-off detection chip 234 is connected to the detection signal input end of the power switching module 24 through the third resistor 233 as the signal output end of the power-off detection module 23.

[0054] like Figure 2As shown, specifically, in this embodiment, a first resistor 231 and a second resistor 232 are connected in series at the power supply output ends of the main power supply unit 21 and the backup power supply unit 22, and the divided voltage is taken as the detection voltage and input to the power-off detection chip 234 for detecting whether the main power supply unit 21 and the backup power supply unit 22 are powered off. When the detection voltage is lower than a certain value, the output end of the power-off detection chip 234 outputs a low-level signal to the power switching module 24. When the power switching module 24 receives this low-level signal, it executes a power switching operation to switch the current power supply unit to another power supply unit.

[0055] like Figure 2 As shown, in one embodiment, the redundant power supply module 2 also includes an anti-backflow diode 27 and a super capacitor 28, the positive pole of the anti-backflow diode 27 is connected to the output end of the power switching module 24, the negative pole of the anti-backflow diode 27 is connected to the input end of the voltage conversion module 25, the first end of the super capacitor 28 is connected to the negative pole of the anti-backflow diode 27, and the second end of the super capacitor 28 is grounded.

[0056] Specifically, in this embodiment, the function of the anti-backflow diode 27 is to prevent the power of the supercapacitor 28 from flowing back and causing damage to the circuit. The function of the supercapacitor 28 is to store electrical energy. When the current power supply unit fails and is cut off, the electrical energy stored in the supercapacitor 28 can still be used to supply part of the circuit with power for a period of time, so that the metering data can be stored normally during the switching process of the power supply unit.

[0057] like Figure 1 As shown, in one embodiment, the multi-parameter flow transmitter body 1 includes a pressure sensor 11, a temperature sensor 12, a differential pressure transmitter 13, a signal conditioning circuit 14, an MCU controller 15, a communication module 16, a display module 17, a clock module 18, a memory 19 and a key module 20.

[0058] The output ends of the pressure sensor 11 and the temperature sensor 12 are respectively connected to the input ends of the signal conditioning circuit 14, and the output end of the signal conditioning circuit 14, the differential pressure transmitter 13, the communication module 16, the display module 17, the clock module 18, the memory 19 and the key module 20 are respectively connected to the MCU controller 15.

[0059] Specifically, in this embodiment, the clock module 18 is used to provide a clock signal, the button module 20 is used to set parameters and switch the display interface, the pressure sensor 11, the temperature sensor 12 and the differential pressure sensor are respectively used to detect the pressure signal, the temperature signal and the differential pressure value of the measured medium, the pressure signal and the temperature signal are transmitted to the signal conditioning circuit 14 for processing for signal amplification and analog-to-digital conversion, and then sent to the MCU controller 15, the differential pressure value is directly transmitted to the MCU controller 15 for processing to obtain the flow signal of the measured medium, and the MCU controller 15 can perform online temperature and pressure compensation on the flow signal of the measured medium according to the detected temperature signal and pressure signal, so as to obtain accurate instantaneous flow and cumulative flow. The MCU controller 15 can transmit the received and processed data to the display module 17 for display, and display the temperature, pressure, differential pressure, instantaneous flow and cumulative flow in real time through the display module 17. The MCU controller 15 can also transmit the received and processed data to the memory 19 for storage for subsequent viewing and calling. The MCU controller 15 can also communicate with an external monitoring device (such as a PC, smart mobile terminal and other host computers) through the wireless communication module 16, and send the received and processed data to the external monitoring device in real time. The MCU controller 15 also receives the control instructions sent by the external monitoring device through the wireless communication module 16 to modify the preset parameters inside the flow integrator, and controls the flow regulating mechanism and other actuators connected to it according to the control instructions.

[0060] Specifically, the communication module 16 can adopt wired communication modules such as RS485 module, HART module, etc., and / or can adopt wireless communication modules such as ZigBee module, 4G module, etc.; the display module 17 can adopt LED backlight LCD display or touch screen; the clock module 18 can adopt DS1302 clock chip; the memory 19 can adopt 24C02 storage chip; the MCU controller 15 can adopt MSP430F149 single chip microcomputer.

[0061] In the specification of the present utility model, a lot of specific details are described. However, it is understood that the embodiments of the present utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this specification.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A multi-parameter flow transmitter, comprising a multi-parameter flow transmitter body, characterized in that: It also includes a redundant power supply module, which includes a main power supply unit, a backup power supply unit, a power failure detection module, a power switching module, a voltage conversion module and a power supply port, wherein: The power supply output ends of the main power supply unit and the backup power supply unit are respectively connected to the input end of the voltage conversion module through the power switching module, and the output end of the voltage conversion module is connected to the power supply port. The power supply output ends of the main power supply unit and the backup power supply unit are also connected to the signal input end of the power-off detection module, and the signal output end of the power-off detection module is connected to the detection signal input end of the power switching module. The power supply port is used to power the multi-parameter flow transmitter body.

2. The multi-parameter flow transmitter according to claim 1, characterized in that: The main power supply unit includes a mains input interface, a step-down transformer, a rectifier circuit and a filter circuit which are connected in sequence. The mains input interface is used to connect to a mains power supply, and the output end of the filter circuit is connected to the first power input end of the power switching module.

3. The multi-parameter flow transmitter according to claim 2, characterized in that: The backup power supply unit includes a battery, and the battery is connected to the second power input terminal of the power switching module.

4. The multi-parameter flow transmitter according to claim 3, characterized in that: The storage battery is a rechargeable lithium battery.

5. The multi-parameter flow transmitter according to claim 4, characterized in that: The backup power supply unit also includes a charge and discharge controller, the output ends of the storage battery and the filter circuit are respectively connected to the charge and discharge controller, and the charge and discharge controller is connected to the second power input end of the power switching module.

6. The multi-parameter flow transmitter according to claim 1, characterized in that: The power switching module is an STS static transfer switch.

7. The multi-parameter flow transmitter according to claim 1, characterized in that: The power switching module includes a first relay, a second relay and a switching control module, wherein: One end of the coil of the first relay is connected to the first output end of the switching control module, and the other end of the coil of the first relay is grounded; One end of the coil of the second relay is connected to the second output end of the switching control module through the normally closed contact of the first relay, and the other end of the coil of the second relay is grounded; The output end of the power failure detection module is connected to the input end of the switching control module; The power supply output terminal of the main power supply unit is connected to the input terminal of the voltage conversion module through the normally open contact of the first relay and the normally closed contact of the second relay connected in series; The power supply output terminal of the backup power supply unit is connected to the input terminal of the voltage conversion module through the normally open contact of the second relay.

8. The multi-parameter flow transmitter according to claim 1, characterized in that: The power-off detection module includes a first resistor, a second resistor, a third resistor and a power-off detection chip, wherein: The first end of the first resistor is connected to the power supply output ends of the main power supply unit and the backup power supply unit, the second end of the first resistor is connected to the first end of the second resistor, the second end of the second resistor is grounded, the input end of the power-off detection chip is connected to the second end of the first resistor, and the output end of the power-off detection chip is connected to the detection signal input end of the power switching module through the third resistor as the signal output end of the power-off detection module.

9. The multi-parameter flow transmitter according to any one of claims 1 to 8, characterized in that: The redundant power supply module also includes a backflow prevention diode and a super capacitor, the positive pole of the backflow prevention diode is connected to the output end of the power switching module, the negative pole of the backflow prevention diode is connected to the input end of the voltage conversion module, the first end of the super capacitor is connected to the negative pole of the backflow prevention diode, and the second end of the super capacitor is grounded.

10. The multi-parameter flow transmitter according to any one of claims 1 to 8, characterized in that: The multi-parameter flow transmitter body includes a pressure sensor, a temperature sensor, a differential pressure transmitter, a signal conditioning circuit, an MCU controller, a communication module, a display module, a clock module, a memory and a key module. The output ends of the pressure sensor and the temperature sensor are respectively connected to the input end of the signal conditioning circuit, and the output end of the signal conditioning circuit, the differential pressure transmitter, the communication module, the display module, the clock module, the memory and the key module are respectively connected to the MCU controller.

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