CN209570216U - Facilitate the transmitter of the two-wire system loop power supply of test, maintenance - Google Patents
Facilitate the transmitter of the two-wire system loop power supply of test, maintenance Download PDFInfo
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- CN209570216U CN209570216U CN201920517452.5U CN201920517452U CN209570216U CN 209570216 U CN209570216 U CN 209570216U CN 201920517452 U CN201920517452 U CN 201920517452U CN 209570216 U CN209570216 U CN 209570216U
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- transmitter
- test
- power supply
- maintenance
- decompression device
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Abstract
The utility model relates to the transmitter technical fields of loop power supply, more particularly to a kind of transmitter for the two-wire system loop power supply for facilitating test, maintenance, including sequentially connected sensor signal input module, input and output conversion module and 4-20mA current signal output module, it further include decompression device D1 and TEST point, TEST point and decompression device D1 are connected between 4-20mA current signal output module and transmitter power end, and decompression device D1 is located between TEST point and the power end of transmitter.The utility model passes through TEST point, so that not needing to disconnect transmitter output loop i.e. power supply, can directly measuring the current value in output loop in this way in malfunction elimination, maintenance and test calibration loop current, overhaul it is very convenient, solve the problems, such as execute-in-place difficulty.
Description
Technical field
The utility model relates to the transmitter technical field of loop power supply more particularly to a kind of two for facilitating test, overhauling
The transmitter of line loop power supply.
Background technique
The transmitters such as the transmitter of two-wire system loop power supply such as temperature, humidity, pressure are the widely applied instrument of industry spot
Table, it is directly exporting the converted output 4-20mA current signal of sensor signal to the system control equipments such as DCS, PLC
Energy is intercepted on circuit as working power.
As shown in fig. 6, the transmitter failure when two-wire system loop power supply needs to overhaul, or need test calibration
When, often the power positive end (port 1) of the transmitter of two-wire system loop power supply or negative terminal (port 2) wiring are disconnected, sealed in
Ammeter carries out malfunction elimination, maintenance, test calibration, and such maintenance mode is not only not easy to operate in industry spot, but also
The output loop i.e. power supply for needing to disconnect the transmitter of two-wire system loop power supply brings great inconvenience to maintenance, has
Industry spot do not allow then that the disconnection of the transmitter of two-wire system loop power supply is tested and overhauled.
Utility model content
The utility model provides a kind of transmitter of two-wire system loop power supply for facilitating test, maintenance, do not need by
Transmitter power supply (i.e. output loop) can directly measure the current signal on output loop in the case where disconnecting, solve existing
The problem of field operating difficulties.
In order to realize the purpose of this utility model, used technical solution is: facilitating the two-wire system circuit of test, maintenance
The transmitter of power supply, including sequentially connected sensor signal input module, input and output conversion module and 4-20mA electric current letter
Number output module, further includes decompression device D1 and TEST point, it is defeated that TEST point and decompression device D1 are connected on 4-20mA current signal
Out between module and transmitter power end, decompression device D1 is located between TEST point and the power end of transmitter.
As the prioritization scheme of the utility model, decompression device D1 is when the voltage at its both ends is less than the threshold voltage of itself
When, the device of the small Mr. Yu's value of the electric current that no current passes through or passes through.
As the prioritization scheme of the utility model, decompression device D1 is TVS pipe.
As the prioritization scheme of the utility model, decompression device D1 is diode.
As the prioritization scheme of the utility model, decompression device D1 is triode, emitter and the TEST point phase of triode
Even, the base stage of triode and the collector of triode are connected with the power end of transmitter.
The utility model has the effect of positive: 1) the utility model is by test point so that malfunction elimination, maintenance and
When test calibration loop current, do not need to disconnect transmitter output loop i.e. power supply, in transmitter work, directly measurement output
Current value in circuit, maintenance is convenient, solves the problems, such as execute-in-place difficulty；
2) the utility model structure is simple, easy to produce, while saving maintenance and testing time.
Detailed description of the invention
Utility model will be further described in detail below with reference to the attached drawings and specific embodiments.
Fig. 1 is the whole functional block diagram of the utility model；
Fig. 2 is the structural schematic diagram of the utility model；
Fig. 3 is that the decompression device of the utility model is the partial test equivalent circuit diagram of TVS pipe；
Fig. 4 is the partial test equivalent circuit diagram for the TVS pipe that the decompression device of the utility model is reversal connection；
Fig. 5 is that the decompression device of the utility model is the partial test equivalent circuit diagram of triode；
Fig. 6 is the connection figure of the test that the utility model is not used, the transmitter of maintenance two-wire system loop power supply.
Wherein: 1, sensor signal input module, 2, input and output conversion module, 3,4-20mA current signal output mould
Block, 4, TEST point.
Specific embodiment
As shown in Figs. 1-2, the utility model discloses a kind of pick-ups of two-wire system loop power supply for facilitating test, maintenance
Device, including sequentially connected sensor signal input module 1, input and output conversion module 2 and 4-20mA current signal export mould
Block 3, further includes decompression device D1 and TEST point 4, and TEST point 4 and decompression device D1 are connected on 4-20mA current signal output module
Between 3 and transmitter power end, decompression device D1 is located between TEST point 4 and the power end of transmitter.Wherein, the electricity of transmitter
Source includes the power positive end of transmitter and the power supply negative terminal of transmitter；Sensor signal input module 1 is for input temp, wet
The sensor signals such as degree or pressure.
The characteristics of decompression device D1 is when the voltage at its both ends is less than the threshold voltage V of itselfZWhen, electric current cannot pass through
Or the electric current small Mr. Yu's value passed through will not influence measuring accuracy when testing at this time using ammeter or other measuring devices.Due to
The internal resistance of ammeter or measuring device is smaller, and when no measuring device accesses, electric current is flowed through from decompression device D1；When measurement is set
When standby access, in certain current range, the pressure drop at measuring device both ends is smaller, and the pressure drop at measuring device both ends is less than decompression
The threshold voltage of device D1, therefore measuring device can accurately reflect current value in circuit.Wherein, the threshold values of decompression device D1
Voltage VZ, by applying voltage at the both ends decompression device D1, measurement is by the electric current of decompression device D1, when thinking that current value is less than
A certain value, and the value is considered sufficiently small when not influencing loop current measurement accuracy, voltage is the valve of decompression device D1 at this time
Threshold voltage VZ。
As shown in figure 3, decompression device D1 is TVS pipe.R1 is the internal resistance of measuring device, and the threshold voltage of TVS pipe, which is greater than, to be surveyed
The pressure drop of equipment is measured, when not connecing measuring device, loop current flows through decompression device D1；When accessing measuring device, in circuit
Electric current all flowed through from measuring device, decompression device D1 no current passes through.In addition, it is also possible to the forward voltage drop conduct of TVS pipe
Decompression device, as shown in Figure 4.
Decompression device D1 is diode, and when accessing measuring device, the electric current in circuit is all flowed through from measuring device, drop
Voltage device D1 no current passes through.
As shown in figure 5, decompression device D1 is triode, the emitter of triode is connected with TEST point 4, the base stage of triode
It is connected with the power supply of transmitter with the collector of triode.R1 is the internal resistance of measuring device, and the threshold voltage of triode is greater than
The pressure drop of measuring device, when not connecing measuring device, loop current flows through decompression device D1；When accessing measuring device, circuit
In electric current all flowed through from measuring device, decompression device D1 no current passes through.
When needing the electric current in malfunction elimination, maintenance and test calibration circuit, multimeter or other measurements are set
Then two test pencils are coupled with transmitter power positive end and TEST point 4, circuit by the standby test mode for being set as DC current
In electric current can simultaneously be shown in multimeter or measuring device.
Particular embodiments described above has carried out into one the purpose of this utility model, technical scheme and beneficial effects
Step is described in detail, it should be understood that being not limited to this foregoing is merely specific embodiment of the utility model
Utility model, within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done should all wrap
Containing being within the protection scope of the utility model.
Claims (5)
1. facilitating the transmitter of the two-wire system loop power supply of test, maintenance, including sequentially connected sensor signal input module
(1), input and output conversion module (2) and 4-20mA current signal output module (3), it is characterised in that: further include decompression device
D1 and TEST point (4), the TEST point (4) and decompression device D1 are connected on 4-20mA current signal output module (3) and become
It send between device power end, the decompression device D1 is located between TEST point (4) and the power end of transmitter.
2. the transmitter of the two-wire system loop power supply according to claim 1 for facilitating test, maintenance, it is characterised in that: drop
Voltage device D1 be when the voltage at its both ends is less than itself threshold voltage, the small Mr. Yu's value of the electric current that no current passes through or passes through
Device.
3. the transmitter of the two-wire system loop power supply according to claim 1 or 2 for facilitating test, maintenance, it is characterised in that:
The decompression device D1 is TVS pipe.
4. the transmitter of the two-wire system loop power supply according to claim 1 or 2 for facilitating test, maintenance, it is characterised in that:
The decompression device D1 is diode.
5. the transmitter of the two-wire system loop power supply according to claim 1 or 2 for facilitating test, maintenance, it is characterised in that:
The decompression device D1 is triode, and the emitter of triode is connected with TEST point (4), the base stage of triode and triode
Collector is connected with the power end of transmitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920517452.5U CN209570216U (en) | 2019-04-17 | 2019-04-17 | Facilitate the transmitter of the two-wire system loop power supply of test, maintenance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920517452.5U CN209570216U (en) | 2019-04-17 | 2019-04-17 | Facilitate the transmitter of the two-wire system loop power supply of test, maintenance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209570216U true CN209570216U (en) | 2019-11-01 |
Family
ID=68336137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920517452.5U Active CN209570216U (en) | 2019-04-17 | 2019-04-17 | Facilitate the transmitter of the two-wire system loop power supply of test, maintenance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209570216U (en) |
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2019
- 2019-04-17 CN CN201920517452.5U patent/CN209570216U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211012 Address after: 211100 No. 19, Jinxin Middle Road, Jiangning District, Nanjing, Jiangsu Province (Jiangning Development Zone) Patentee after: Nanjing youbei Electric Technology Co.,Ltd. Address before: 211112 puliu Road, Liuhe Economic Development Zone, Nanjing, Jiangsu Patentee before: NANJING NEW POWER ELECTRIC Co.,Ltd. |
|
| TR01 | Transfer of patent right |