CN207976224U - A kind of temperature transmitter - Google Patents
A kind of temperature transmitter Download PDFInfo
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- CN207976224U CN207976224U CN201820226224.8U CN201820226224U CN207976224U CN 207976224 U CN207976224 U CN 207976224U CN 201820226224 U CN201820226224 U CN 201820226224U CN 207976224 U CN207976224 U CN 207976224U
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Abstract
The utility model discloses a kind of temperature transmitters, including Acquisition Circuit, ADC analog to digital conversion circuits, room temperature detection circuit, processor, 4 20mA loop currents circuits and HART communication circuit, Acquisition Circuit is connected with the communication of ADC analog to digital conversion circuits, ADC analog to digital conversion circuits, room temperature detection circuit and 4 20mA loop currents circuits, which are communicated with processor, to be connected, HART communication circuit is connect with processor both-way communication, 4 20mA loop currents circuits also connect to form circuit loop with HART communication circuit, the utility model can support the access of more multi signal, and it can realize remote debugging.
Description
Technical field
The utility model is related to the acquisitions of industrial data and pick-up to export field, particularly relate to a kind of temperature transmitter.
Background technology
Temperature transmitter converts instrument as a kind of temperature signal, is installed in a meter housing on temperature sensor top,
It is mainly used for receiving the temperature signal of temperature sensor acquisition and the temperature signal that temperature sensor acquires is converted into standard
Analog signal such as 4-20mA signal.The fixed temperature transmitter of temperature sensor and its top is mostly operated in hot environment
In, operating personnel are generally difficult to close, this brings great trouble to later stage debugging efforts, and big in existing temperature transmitter
All using the bridge-type sample circuit being made of temperature sensor, however bridge-type sample circuit is unrelated with other signals sample circuit
Connection, therefore, the bridge-type sample circuit of temperature transmitter cannot achieve the access of multi-signal, and accessible signal is single, in addition, defeated
The temperature signal for entering temperature transmitter is easily interfered by industrial forceful electric power, and the temperature of measurement is finally made to generate deviation or bounce.
Invention content
The purpose of this utility model is to provide a kind of temperature transmitters.
A kind of temperature transmitter, including the Acquisition Circuit of temperature sensor electricity, ADC analog to digital conversion circuits, room temperature detection electricity
Road, processor, 4-20mA loop currents circuit and HART communication circuit, Acquisition Circuit are connected with the communication of ADC analog to digital conversion circuits,
ADC analog to digital conversion circuits, room temperature detection circuit and 4-20mA loop currents circuit are communicated with processor and are connected, HART communication electricity
Road is connect with processor both-way communication, and 4-20mA loop currents circuit also connect to form circuit loop with HART communication circuit,
In：
The influence value that Acquisition Circuit is used to vary with temperature temperature sensor and change is converted into voltage value；
ADC analog to digital conversion circuits are used to convert the analog signal for the voltage value that Acquisition Circuit acquires to digital signal；
Room temperature detection circuit is used to detect the ambient temperature signal of temperature sensor tie point, is thermoelectricity in temperature sensor
When even, it is used as the cold junction compensation temperature value of thermocouple, in the calculating of final temperature value；
Processor is used to receive ADC analog to digital conversion circuits, the signal that room temperature detection circuit conveys and carries out calculation processing, root
Coherent signal is sent according to the result of calculating and gives 4-20mA loop current circuits, is led to external equipment by HART communication circuit
News；
4-20mA loop current circuits receive the coherent signal that processor is sent, and the coherent signal is converted to simulation letter
Number, to generate the loop current signal changed linearly with detection temperature change in 4-20mA, and the loop current signal stream
Through HART communication circuit；
HART communication circuit is for going out the loop current signal transmission that 4-20mA loop current circuits generate, Yi Jishi
The mutual transmission of existing digital signal between processor and external equipment.
Further, between ADC analog to digital conversion circuits and processor be equipped with photoelectric isolating circuit, photoelectric isolating circuit for pair
The digital signal of ADC analog to digital conversion circuits output carries out isolation transmission, reduces interference signal.Compared to existing temperature transmitter, increase
If photoelectric isolating circuit, reinforce anti-interference ability, weakens industrial forceful electric power interference so that the temperature value finally detected is more acurrate.
Further, Acquisition Circuit is partial pressure Acquisition Circuit, and Acquisition Circuit includes concatenated temperature sensor R1 and ground connection
A fixed voltage, the middle point voltage of temperature sensor R1 and ground resistance R2 are accessed in the free end resistance R2, temperature sensor R1
Output voltage as Acquisition Circuit.The utility model Acquisition Circuit can be bridge-type Acquisition Circuit or partial pressure Acquisition Circuit, preferably
Ground, for the utility model using partial pressure collector, partial pressure collector is simple in structure, and compares bridge-type Acquisition Circuit, because being passed in temperature
The free terminal voltages of sensor R1 are fixed, and thermocouple signal, thermal resistance signal can share the fixed voltage, and therefore, this practicality is new
There are the shared resources of unlike signal for type, can support the access of more multi signal.
Temperature transmitter described in the utility model, has the following advantages：
1）Provided with room temperature detection circuit, the ambient temperature signal of temperature sensor tie point is constantly detected, in access
When temperature sensor is thermocouple, it is used as the cold junction compensation temperature of thermocouple, the ambient temperature value of room temperature detection circuit detection is used
In the calculating of final temperature value, when the temperature sensor of access is thermal resistance, the environment temperature of room temperature detection circuit detection
It will not be used in by processor in the calculating of final temperature value, compared to existing without room temperature detection circuit, the temperature sensor of access
It is only the temperature transmitter of thermal resistance, the temperature sensor of the utility model access may be either thermal resistance or thermocouple,
Or the linear resistance for measuring liquid level, in this way, being suitable for the access of more unlike signals；
2）It, can be long-range to realize with peripheral device communication by HART communication circuit provided with HART communication circuit
Debugging, to carry out the modification of parameter, meanwhile, the loop current signal that can will be generated on 4-20mA loop current circuits（Represent
The signal of final temperature value）It transfers out, in this way, existing temperature transmitter is avoided on-line scheduling and can only can not closely to read
Embarrassment, keep detection work especially later stage debugging efforts more convenient.
Description of the drawings
Fig. 1 is the functional block diagram of the utility model temperature transmitter；
Fig. 2 is the circuit diagram of the Acquisition Circuit of the utility model temperature transmitter.
Specific implementation mode
The better embodiment of the utility model temperature transmitter is described in detail below in conjunction with the accompanying drawings.Such as Fig. 1 and
Shown in Fig. 2, a kind of temperature transmitter, including the detection of Acquisition Circuit 1, ADC analog to digital conversion circuits 2, photoelectric isolating circuit 3, room temperature
Circuit 4, processor 5,4-20mA loop currents circuit 6 and HART communication circuit 7, Acquisition Circuit 1 are partial pressure Acquisition Circuit, acquisition
Circuit 1 includes concatenated temperature sensor R1 and ground resistance R2, and a fixed voltage, temperature are accessed in the free ends temperature sensor R1
Output voltage of the middle point voltage of sensor R1 and ground resistance R2 as Acquisition Circuit 1, Acquisition Circuit 1 successively with ADC moulds
Number conversion circuit 2, the communication connection of photoelectric isolating circuit 3, photoelectric isolating circuit 3, room temperature detection circuit 4,4-20mA loop currents
Circuit 6 is connected with the communication of processor 5, and HART communication circuit 7 is connect with 5 both-way communication of processor, 4-20mA loop currents circuit 6
Also it connect to form circuit loop with HART communication circuit 7, wherein：
The influence value that Acquisition Circuit 1 is used to vary with temperature temperature sensor and change is converted into voltage value；
ADC analog to digital conversion circuits 2 are used to convert the analog signal for the voltage value that Acquisition Circuit 1 acquires to digital signal；
Photoelectric isolating circuit 3 is used to carry out isolation transmission to the digital signal that ADC analog to digital conversion circuits 2 export, and reduces dry
Disturb signal；
Room temperature detection circuit 4 is used to detect the ambient temperature signal of temperature sensor tie point, is heat in temperature sensor
When galvanic couple, it is used as the cold junction compensation temperature value of thermocouple, in the calculating of final temperature value；
Processor 5 is used to receive photoelectric isolating circuit 3, the signal that room temperature detection circuit 4 conveys and carries out calculation processing, root
Coherent signal is sent to 4-20mA loop currents circuit 6 according to the result of calculating, is carried out by HART communication circuit 7 and external equipment
Communication；
4-20mA loop currents circuit 6 receives the coherent signal that processor 5 is sent, and the coherent signal is converted to simulation
Signal, to generate the loop current signal changed linearly with detection temperature change in 4-20mA, and the loop current signal
Flow through HART communication circuit 7；
HART communication circuit 7 is used to go out the loop current signal transmission that 4-20mA loop currents circuit 6 generates, and
Realize the mutual transmission of digital signal between processor 5 and external equipment.
In the utility model temperature transmitter better embodiment, after Acquisition Circuit 1 detects temperature signal, it is delivered to ADC
Analog to digital conversion circuit 2, and digital signal, the number letter that ADC analog to digital conversion circuits 2 convert are converted by ADC analog to digital conversion circuits 2
Isolation transmission number through photoelectric isolating circuit 3, is sent into processor 5, and processor 5 is according to the temperature sensor R1 signals of access
Type detects in conjunction with room temperature detection circuit 4 and is sent into the ambient temperature signal of the temperature sensor R1 tie points of processor 5, into
Row calculates, and sends coherent signal to 4-20mA loop currents circuit 6 further according to the result of calculating, makes 4-20mA loop current circuits
With detecting temperature change and the loop current signal that changes linearly in 6 generation 4-20mA, HART communication circuit 7 is by 4-
Loop current signal on 20mA loop currents circuit 6 transfers out, so that operating personnel are read out, and when that need to debug,
Complete the communication between processor 5 and external equipment.
The utility model temperature transmitter, has the following advantages：
1）Provided with room temperature detection circuit 4, the ambient temperature signal of temperature sensor tie point is constantly detected, is being accessed
Temperature sensor be thermocouple when, be used as thermocouple cold junction compensation temperature, room temperature detection circuit 4 detect ambient temperature value
In calculating for final temperature value, when the temperature sensor of access is thermal resistance, the environment temperature of the detection of room temperature detection circuit 4
Angle value will not be used in the calculating of final temperature value by processor 5, compared to existing without room temperature detection circuit 4, the temperature of access
Sensor is only the temperature transmitter of thermal resistance, and the temperature sensor of the utility model access may be either thermal resistance, or
Thermocouple, or the linear resistance for measuring liquid level, in this way, being suitable for the access of more unlike signals；
2）It, can be remote to realize with peripheral device communication by HART communication circuit 7 provided with HART communication circuit 7
Journey is debugged, to carry out the modification of parameter, meanwhile, the loop current signal that can will be generated on 4-20mA loop currents circuit 6（That is generation
The signal of table final temperature value）It transfers out, in this way, existing temperature transmitter is avoided on-line scheduling and can only can not closely to read
Several embarrassments keeps detection work especially later stage debugging efforts more convenient.
In the above-mentioned preferred embodiment of the utility model temperature transmitter, set between ADC analog to digital conversion circuits 2 and processor 5
There are photoelectric isolating circuit 3, the digital signal that photoelectric isolating circuit 3 is used to export ADC analog to digital conversion circuits 2 to carry out isolation biography
It is defeated, reduce interference signal.Compared to existing temperature transmitter, it is additionally arranged photoelectric isolating circuit 3, reinforces anti-interference ability, weakens work
Industry forceful electric power interferes so that the temperature value finally detected is more acurrate.
The utility model temperature transmitter, Acquisition Circuit can be point described in bridge-type Acquisition Circuit or above-mentioned preferred embodiment
Acquisition Circuit is pressed, preferably, Acquisition Circuit is partial pressure Acquisition Circuit, Acquisition Circuit includes concatenated temperature sensor R1 and ground connection
A fixed voltage, the middle point voltage of temperature sensor R1 and ground resistance R2 are accessed in the free end resistance R2, temperature sensor R1
Output voltage as Acquisition Circuit.For the utility model Acquisition Circuit using partial pressure collector, partial pressure Acquisition Circuit is simple in structure,
And bridge-type Acquisition Circuit is compared, because being fixed in the free terminal voltages of temperature sensor R1, thermocouple signal, thermal resistance signal can be total to
With the fixed voltage, therefore, there are the shared resources of unlike signal for the utility model, can support the access of more multi signal.
The utility model temperature transmitter, when processor 5 do not receive ADC analog to digital conversion circuits 2 convert after through photoelectricity every
When signal value from circuit 3, coherent signal can be transmitted to 4-20mA loop currents circuit 6 in processor 5, makes 4-20mA loop currents
Circuit 6 exports a fixed loop current signal not within the scope of 4-20mA.In this way, to remind user's acquisition circuit disconnected
Line.
Claims (3)
1. a kind of temperature transmitter, it is characterised in that：Include include the Acquisition Circuit of temperature sensor, ADC analog to digital conversion circuits,
Room temperature detection circuit, processor, 4-20mA loop currents circuit and HART communication circuit, Acquisition Circuit and ADC analog-to-digital conversion electricity
Road communication connection, ADC analog to digital conversion circuits, room temperature detection circuit and 4-20mA loop currents circuit, which are communicated with processor, to be connected
It connects, HART communication circuit is connect with processor both-way communication, and 4-20mA loop currents circuit also connect shape with HART communication circuit
At circuit loop, wherein：
The influence value that Acquisition Circuit is used to vary with temperature temperature sensor and change is converted into voltage value；
ADC analog to digital conversion circuits are used to convert the analog signal for the voltage value that Acquisition Circuit acquires to digital signal；
Room temperature detection circuit is used to detect the ambient temperature signal of temperature sensor tie point, is thermocouple in temperature sensor
When, it is used as the cold junction compensation temperature value of thermocouple, in the calculating of final temperature value；
Processor is used to receive ADC analog to digital conversion circuits, the signal that room temperature detection circuit conveys and carries out calculation processing, according to meter
The result of calculation sends coherent signal and gives 4-20mA loop current circuits, is communicated with external equipment by HART communication circuit；
4-20mA loop current circuits receive the coherent signal that processor is sent, and the coherent signal is converted to analog signal,
To generate the representative loop current signal changed linearly with detection temperature change in 4-20mA, and the loop current signal stream
Through HART communication circuit；
HART communication circuit be used for by the loop current signal transmission that 4-20mA loop current circuits generate go out and realization at
Manage the mutual transmission of digital signal between device and external equipment.
2. temperature transmitter according to claim 1, it is characterised in that：It is equipped between ADC analog to digital conversion circuits and processor
Photoelectric isolating circuit, photoelectric isolating circuit are reduced for carrying out isolation transmission to the digital signal that ADC analog to digital conversion circuits export
Interference signal.
3. temperature transmitter according to claim 1, it is characterised in that：Acquisition Circuit is partial pressure Acquisition Circuit, acquisition electricity
Road includes concatenated temperature sensor R1 and ground resistance R2, and a fixed voltage is accessed in the free ends temperature sensor R1, and temperature passes
Output voltage of the middle point voltage of sensor R1 and ground resistance R2 as Acquisition Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820226224.8U CN207976224U (en) | 2018-02-08 | 2018-02-08 | A kind of temperature transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820226224.8U CN207976224U (en) | 2018-02-08 | 2018-02-08 | A kind of temperature transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207976224U true CN207976224U (en) | 2018-10-16 |
Family
ID=63767342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820226224.8U Active CN207976224U (en) | 2018-02-08 | 2018-02-08 | A kind of temperature transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207976224U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110806226A (en) * | 2019-09-27 | 2020-02-18 | 中国一冶集团有限公司 | Wireless transmitter and inspection system, verification method and debugging method thereof |
| CN116026486A (en) * | 2023-01-29 | 2023-04-28 | 中国长江电力股份有限公司 | But human-computer interaction's multi-output temperature changer |
-
2018
- 2018-02-08 CN CN201820226224.8U patent/CN207976224U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110806226A (en) * | 2019-09-27 | 2020-02-18 | 中国一冶集团有限公司 | Wireless transmitter and inspection system, verification method and debugging method thereof |
| CN116026486A (en) * | 2023-01-29 | 2023-04-28 | 中国长江电力股份有限公司 | But human-computer interaction's multi-output temperature changer |
| CN116026486B (en) * | 2023-01-29 | 2024-03-12 | 中国长江电力股份有限公司 | But human-computer interaction's multi-output temperature changer |
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