CN219084264U - Transmitter calibrating device based on weak signal output - Google Patents
Transmitter calibrating device based on weak signal output Download PDFInfo
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- CN219084264U CN219084264U CN202222851820.4U CN202222851820U CN219084264U CN 219084264 U CN219084264 U CN 219084264U CN 202222851820 U CN202222851820 U CN 202222851820U CN 219084264 U CN219084264 U CN 219084264U
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Abstract
The utility model provides a transmitter calibration device based on weak signal output, which comprises a current signal acquisition unit and a signal output unit, wherein the current signal acquisition unit comprises a current signal acquisition terminal, an AD conversion chip and a calibration controller, the signal output unit comprises a signal output terminal and a DA conversion chip, the current signal acquisition terminal is connected with the input end of the AD conversion chip, the output end of the AD conversion chip is connected with the input end of the calibration controller, the output end of the calibration controller is connected with the input end of the DA conversion chip, and the output end of the DA conversion chip is connected with the signal output terminal. The utility model can calibrate the transmitter based on weak current output in real time and then output the calibrated value; simultaneously, output signals of a plurality of transmitters are output after real-time calibration; the calibration of the full-range output signal of the transmitter is realized; the fixed mounting is between changer and secondary instrument, and the installation is simple, the suitability is good.
Description
Technical Field
The utility model relates to the technical field of transmitter calibration equipment, in particular to a transmitter calibration device based on weak signal output.
Background
In thermodynamic systems, temperature transmitters and pressure transmitters are often used to detect the temperature and pressure information of the heating to adaptively adjust the heating parameters. When there is an error in the pressure transmitter or the temperature transmitter, the heating system may consume more energy, such as the expected heating water temperature is 50 ℃, but the temperature value output when the actual water temperature is 50 ℃ is 45.5 ℃ because the temperature transmitter is used for a long time, and the heating system needs to increase the energy consumption to compensate the water temperature difference of 0.5 ℃. Although the temperature difference is only 0.5 ℃, the increased energy consumption is very large due to the large heat supply range, and huge energy waste is caused.
A temperature transmitter currently used adopts a thermocouple and a thermal resistor as temperature measuring elements, signals output by the temperature measuring elements are sent to a transmitter module, are converted into 4-20 mA current signals which are in linear relation with temperature after being subjected to signal processing, and are then connected to a secondary instrument, so that measurement, indication and process adjustment are carried out. A pressure transformer used in thermodynamic system is to transform the physical pressure parameters of gas, liquid, etc. sensed by pressure measuring sensor into 4-20 mA current signal for the secondary instrument of indication alarm, recorder, regulator, etc. to measure, indicate and process regulation.
For temperature and pressure transmitters, they are typically calibrated periodically by a calibration device, but the calibration method uses a way to compensate for the measured value, i.e., add (or subtract) a fixed value over the full range, and shift the output value of the transmitter as a whole. The method can not calibrate the linearity of the output value of the transmitter and can not correct the nonlinearity problem of the output value. In addition, calibration of certain transmitters can be very difficult to operate due to the environment in which the transmitters are used and the location (e.g., overhead) in which the transmitters are installed, adding to the difficulty of calibration.
Disclosure of Invention
In order to solve at least one of the technical problems, the utility model provides a calibration device based on a weak current signal output transmitter.
The utility model provides a calibrating device based on low current signal output changer, includes current signal acquisition unit and signal output unit, current signal acquisition unit includes current signal acquisition terminal, AD conversion chip and calibration controller, signal output unit includes signal output terminal and DA conversion chip, current signal acquisition terminal with AD conversion chip's input is connected, AD conversion chip's output with calibration controller's input is connected, calibration controller's output with DA conversion chip's input is connected, DA conversion chip's output with signal output terminal is connected.
Preferably, the transmitter calibration device further comprises a communication interface, the communication interface being connected to the calibration controller.
Preferably, any of the above schemes is that the communication interface is an RS485 communication interface.
Preferably, in any of the above aspects, the communication interface is a wireless communication interface.
Preferably, in any of the above aspects, the transmitter calibration device further comprises an AC-DC power conversion unit and a DC-DC power isolation unit, and the AC-DC power conversion unit is connected to the DC-DC power isolation unit and is used for providing electric energy for the transmitter calibration device after converting AC power into DC power.
In any of the above schemes, preferably, each two current signal acquisition terminals are a group, and each group of current signal acquisition terminals is connected with one AD conversion chip to form a current signal acquisition channel; every two signal output terminals are in a group, and each group of signal output terminals is connected with one DA conversion chip to form a signal output channel.
In any of the above embodiments, the number of the current signal acquisition channels is preferably the same as the number of the signal output channels.
In any of the above embodiments, it is preferable that the number of the current signal acquisition channels and the number of the signal output channels be at least two.
In any of the above aspects, preferably, the number of the current signal acquisition channels and the number of the signal output channels are four.
The calibration device based on the weak current signal output transmitter has the following beneficial effects:
the transmitter based on weak current output can be calibrated in real time and then output a calibrated value, so that secondary instruments such as an indication alarm instrument, a recorder, a regulator and the like can receive more accurate signals to perform more accurate measurement, indication and process adjustment;
output signals of a plurality of transmitters can be calibrated in real time and then output;
the calibration of the full-range output signal of the transmitter can be realized;
the device is fixedly arranged between the transmitter and the secondary instrument, and is simple to install;
calibration data can be written in and changed through the communication interface, so that the applicability of the transmitter calibration device is improved.
Drawings
FIG. 1 is a schematic diagram of a calibration device based on a low current signal output transducer according to a preferred embodiment of the present utility model.
FIG. 2 is a schematic diagram of the circuit functional block diagram of the embodiment of FIG. 1 of a calibration device based on a low current signal output transducer in accordance with the present utility model.
Detailed Description
The utility model will be described in more detail with reference to specific examples.
Example 1
As shown in fig. 1 to 2, a calibration device based on a weak current signal output transmitter comprises a current signal acquisition unit 1 and a signal output unit 2, wherein the current signal acquisition unit 1 comprises a current signal acquisition terminal, an AD conversion chip and a calibration controller 10, the signal output unit 2 comprises a signal output terminal and a DA conversion chip, the current signal acquisition terminal is connected with the input end of the AD conversion chip, the output end of the AD conversion chip is connected with the input end of the calibration controller 10, the output end of the calibration controller 10 is connected with the input end of the DA conversion chip, and the output end of the DA conversion chip is connected with the signal output terminal.
The transmitter calibration device further comprises a communication interface 5, which communication interface 5 is connected to the calibration controller 10. In this embodiment, it is preferable that the communication interface is an RS485 communication interface.
The transmitter calibration device further comprises an AC-DC power supply conversion unit 3 and a DC-DC power supply isolation unit 4, wherein the AC-DC power supply conversion unit 3 is connected with the DC-DC power supply isolation unit 4 and is used for supplying electric energy for the transmitter calibration device after alternating current is converted into direct current.
Each two current signal acquisition terminals are in a group, and each group of current signal acquisition terminals is connected with one AD conversion chip to form a current signal acquisition channel; every two signal output terminals are in a group, each group of signal output terminals is connected with one DA conversion chip to form one channel of signal output channels, the number of current signal acquisition channels is the same as that of the signal output channels, and the number of current signal acquisition channels and the number of signal output channels are at least two.
In this embodiment, it is preferable that the number of the current signal acquisition channels and the number of the signal output channels be four. Specifically, as shown in fig. 1 and fig. 2, the total number of the current signal collecting terminals is eight, and each two adjacent current signal collecting terminals from left to right are a group, including a first current signal collecting channel terminal 111, a second current signal collecting channel terminal 121, a third current signal collecting channel terminal 131 and a fourth current signal collecting channel terminal 141; the first current signal collecting channel terminal 111 is connected with the first AD conversion chip 112 to form a first current signal collecting channel, the second current signal collecting channel terminal 121 is connected with the second AD conversion chip 122 to form a second current signal collecting channel, the third current signal collecting channel terminal 131 is connected with the third AD conversion chip 132 to form a third current signal collecting channel, and the fourth current signal collecting channel terminal 141 is connected with the fourth AD conversion chip 142 to form a fourth current signal collecting channel. The number of the signal output terminals is 8, and every two adjacent signal output terminals from left to right are in a group, and each signal output terminal comprises a first path of signal output channel terminal 212, a second path of signal output channel terminal 222, a third path of signal output channel terminal 232 and a fourth path of signal output channel terminal 242; the first signal output channel terminal 212 and the first DA conversion chip 211 are connected to form a first signal output channel 21, the second signal output channel terminal 222 and the second DA conversion chip 221 are connected to form a second signal output channel 22, the third signal output channel terminal 232 and the third DA conversion chip 231 are connected to form a third signal output channel 23, and the fourth signal output channel terminal 242 and the fourth DA conversion chip 241 are connected to form a fourth signal output channel 24.
In this embodiment, it is preferable that the signal output unit outputs a temperature signal/pressure signal. For example, the first current signal collecting channel is matched with the first signal output channel 21, so that the current output signal of the first transmitter can be calibrated and output, the second current signal collecting channel is matched with the second signal output channel 22, the current output signal of the second transmitter can be calibrated and output, the third current signal collecting channel is matched with the third signal output channel 23, the current output signal of the third transmitter can be calibrated and output, the fourth current signal collecting channel is matched with the fourth signal output channel 24, and the current output signal of the fourth transmitter can be calibrated and output. The first and second transmitters are temperature transmitters and the third and fourth transmitters are pressure transmitters. When the calibration device based on the weak current signal output transmitter is used, firstly, the transmitter to be calibrated is connected with a current signal acquisition channel terminal of the transmitter calibration device, each transmitter is connected with one path of current signal acquisition channel terminal, the current signal output by the transmitter is converted into digital quantity by an AD conversion chip connected with the current signal acquisition channel terminal after being acquired by the current signal acquisition channel terminal, then the calibrated value is obtained by the calibration controller 10, the calibrated value is converted into analog quantity by a DA conversion chip in a signal output channel matched with the current signal acquisition channel, and finally the calibrated analog quantity is output by the signal output channel terminal. For the first path signal output path 21 and the second path signal output path 22, the analog value is a temperature value. For the third signal output channel 23 and the fourth signal output channel 24, the analog value is a pressure value.
In this embodiment, it is preferable that the calibration device based on the weak current signal output transmitter can perform calibration parameter setting through the RS485 communication interface. According to the type of the transmitter connected with each channel, the measuring range, the calibration precision, the calibration rule and the like are set. If for the first transmitter, setting the collected current signal to be 4mA, and setting the calibrated temperature value to be Tmin; when the collected current signal is 20mA, the calibrated temperature value is Tmax, the calibration rule is linear interpolation, and when the collected current signal is I, the corresponding calibrated temperature value is obtained according to the linear interpolation and is output. The measuring range, the calibration precision and the calibration rule can be independently set for the transmitter connected with each channel, and can also be uniformly set. The calibration rules include, but are not limited to, linear interpolation, list lookup, calculus operation, curve fitting, and the like.
The transmitter based on weak current output is calibrated in real time and then the calibrated value is output, so that secondary instruments such as an indication alarm instrument, a recorder, a regulator and the like can receive more accurate signals to perform more accurate measurement, indication and process adjustment; output signals of a plurality of transmitters can be calibrated in real time and then output; the calibration of the full-range output signal of the transmitter can be realized; the device is fixedly arranged between the transmitter and the secondary instrument, and is simple to install; calibration data can be written in and changed through the communication interface, so that the applicability of the transmitter calibration device is improved.
Example 2
Unlike embodiment 1, the communication interface is a wireless communication interface. Through the wireless communication interface, through wireless connection's mode, through remote control to calibration parameter sets up based on the calibrating device of low current signal output transmitter is applicable to the condition that high altitude installation or other mounted positions are inconvenient for operation.
Example 3
Unlike embodiment 1, the signal output unit outputs a current signal.
Example 4
Unlike embodiment 1, the number of the current signal acquisition channels and the number of the signal output channels are two, eight, or other numbers, and the specific number may be specifically selected for the number of the devices of the field Jing Biansong. Or for the case where the number of transmitters requiring calibration is less than the number of current signal acquisition channels, the channels may be left idle.
Example 5
Unlike embodiment 1, the calibration device based on the weak current signal output transducer is used for a heat exchange station, and is installed in a control cabinet in the heat exchange station, and is used for calibrating a temperature transducer, a pressure transducer and other transducers based on weak current output inherent in the heat exchange station and then outputting more accurate signals.
It should be noted that, the technical solutions of the present application are all designed to be improved in terms of hardware, and not related to improvement of software; for each part of which the model is not indicated, the part can be selected from common parts in the prior art, and is not limited by the model; for each component of the model specified in the embodiments, only for describing the technical solution of the present application in detail, it should be understood that the technical solution to be protected by the present utility model is not limited by the model, and there are many alternatives in the prior art for replacing the component. For the parts of parameter setting and the like which need to be realized by means of the program, the method is realized by adopting the prior art after the adaptation change, and the creative improvement of the program is not involved.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting thereof; while the foregoing embodiments are illustrative of the present utility model in detail, those skilled in the art will appreciate that: the technical scheme described in the foregoing embodiments may be modified or some or all of the technical features may be replaced with equivalents, which do not depart from the scope of the technical scheme of the present utility model.
Claims (9)
1. The utility model provides a changer calibrating device based on weak signal output, includes current signal acquisition unit and signal output unit, its characterized in that: the current signal acquisition unit comprises a current signal acquisition terminal, an AD conversion chip and a calibration controller, the signal output unit comprises a signal output terminal and a DA conversion chip, the current signal acquisition terminal is connected with the input end of the AD conversion chip, the output end of the AD conversion chip is connected with the input end of the calibration controller, the output end of the calibration controller is connected with the input end of the DA conversion chip, and the output end of the DA conversion chip is connected with the signal output terminal.
2. The weak signal output based transmitter calibration device of claim 1, wherein: the device also comprises a communication interface, wherein the communication interface is connected with the calibration controller.
3. The weak signal output based transmitter calibration device of claim 2, wherein: the communication interface is an RS485 communication interface.
4. The weak signal output based transmitter calibration device of claim 2, wherein: the communication interface is a wireless communication interface.
5. The weak signal output based transmitter calibration device of claim 1, wherein: the transmitter calibration device further comprises an AC-DC power supply conversion unit and a DC-DC power supply isolation unit, wherein the AC-DC power supply conversion unit is connected with the DC-DC power supply isolation unit and is used for supplying electric energy to the transmitter calibration device after converting alternating current into direct current.
6. The weak signal output based transmitter calibration device of claim 1, wherein: each two current signal acquisition terminals are in a group, and each group of current signal acquisition terminals is connected with one AD conversion chip to form a current signal acquisition channel; every two signal output terminals are in a group, and each group of signal output terminals is connected with one DA conversion chip to form a signal output channel.
7. The weak signal output based transmitter calibration device of claim 6, wherein: the number of the current signal acquisition channels is the same as the number of the signal output channels.
8. The weak signal output based transmitter calibration device of claim 7, wherein: the number of the current signal acquisition channels and the number of the signal output channels are at least two.
9. The weak signal output based transmitter calibration device of claim 7, wherein: the number of the current signal acquisition channels and the number of the signal output channels are four.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222851820.4U CN219084264U (en) | 2022-10-28 | 2022-10-28 | Transmitter calibrating device based on weak signal output |
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| CN202222851820.4U CN219084264U (en) | 2022-10-28 | 2022-10-28 | Transmitter calibrating device based on weak signal output |
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| CN202222851820.4U Active CN219084264U (en) | 2022-10-28 | 2022-10-28 | Transmitter calibrating device based on weak signal output |
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