CN209689816U - Multi-form output digital pressure transducer - Google Patents

Abstract

The utility model discloses multi-form output digital pressure transducers, including the extraneous pressure sensor of connection and the numeric display unit for display and key and power supply for operation, the output end of the pressure sensor is unidirectionally electrically connected with pre-amplification circuit, the output end of the pre-amplification circuit is unidirectionally electrically connected with A/D converter, and the output end of the A/D converter is unidirectionally electrically connected with CPU.The utility model is exported by pressure sensor, numeric display unit, key, pre-amplification circuit, A/D converter, CPU, the first driving circuit, the second driving circuit, D/A converter, first switch amount, second switch amount exports and the setting of V/I converter, it is limited to solve pressure gauge function in the prior art, cannot be provided simultaneously with pressure show, export 4-20mA unified signal and switching value and RS485 communication requirement the problem of, the multi-form output digital pressure transducer, have the advantages of band two-way switching value output, is worthy to be popularized.

Description

Multi-form output digital pressure transducer

Technical field

The utility model relates to pressure automatic control technology field, specially multi-form output digital pressure transducer.

Background technique

Pressure measurement in terms of industrial production, especially the portions such as chemical industry, petroleum, power generation be in industrial automation it is indispensable Few control parameter, in order to guarantee that production is gone on smoothly, process flow can safely and reliably be run, and use various Instrument for Pressure Instruments and meters, come a series of requirements such as the measurements, control, display that meet parameter.

Pressure tool instrument in the prior art has following several: pressure gauge, digital display manometer, pressure switch, intelligent number Aobvious table and pressure transmitter, modern enterprise about the measurement of pressure parameter, do not require nothing more than in many occasions in process of production Display also requires to export unified 4-20mA electric signal and digital output modul signal, but the function of above-mentioned single instrument has Limit cannot be provided simultaneously with the requirement that pressure shows, exports 4-20mA unified signal and switching value and RS485 communication, this is practical There is provided a kind of digital display type pressure transmitters with two-way switching value output for the novel technical issues that need to address, it is intended to solve Above-mentioned problem.

Utility model content

The purpose of this utility model is to provide multi-form output digital pressure transducers, have band two-way switching value and export The advantages of, it is limited to solve pressure gauge function in the prior art, cannot be provided simultaneously with that pressure is shown, to export 4-20mA unified The problem of requirement of signal and switching value and RS485 communication.

To achieve the above object, the utility model provides the following technical solutions: multi-form output digital pressure transducer, packet Include the extraneous pressure sensor of connection and the numeric display unit for display and key and power supply for operation, the pressure The output end of force snesor is unidirectionally electrically connected with pre-amplification circuit, and the output end of the pre-amplification circuit is unidirectionally electrically connected with A/D converter, the output end of the A/D converter are unidirectionally electrically connected with CPU, the unidirectional electrical connection respectively of the output end of the CPU There are the first driving circuit, the second driving circuit and D/A converter, the output end of first driving circuit is unidirectionally electrically connected with One output switch parameter, the output end of second driving circuit are unidirectionally electrically connected with the output of second switch amount, the D/A converter Output end be unidirectionally electrically connected with V/I converter, the output end of the V/I converter is unidirectionally electrically connected with standard current signal.

Preferably, the output end of the power supply respectively with pre-amplification circuit, second switch amount output, D/A converter and The input terminal of V/I converter is unidirectionally electrically connected.

Preferably, the output end of the pressure sensor is opened with numeric display unit, A/D converter, CPU and first respectively The two-way electrical connection of input terminal of pass amount output.

Preferably, the output end of the CPU is unidirectionally electrically connected with the input terminal of numeric display unit, the output of the CPU End with the input terminal of key is two-way is electrically connected.

Preferably, the output end of first switch amount output with the input terminal of numeric display unit is two-way is electrically connected, institute State the output end of the first driving circuit with the input terminal of the second driving circuit is two-way is electrically connected.

Preferably, the output end of the CPU is unidirectionally electrically connected with communication interface, and the communication interface is RS485 interface.

Preferably, the current value range of the standard current signal is 4-20mA.

Compared with prior art, the beneficial effects of the utility model are as follows:

1, the utility model by pressure sensor, numeric display unit, key, pre-amplification circuit, A/D converter, CPU, the first driving circuit, the second driving circuit, D/A converter, the output of first switch amount, the output of second switch amount and V/I turn The setting of parallel operation, it is limited to solve pressure gauge function in the prior art, cannot be provided simultaneously with pressure and show, exports 4-20mA The problem of requirement of unified signal and switching value and RS485 communication, which has band The advantages of two-way switching value exports, is worthy to be popularized.

2, the utility model is by the setting of key, one is being used to the on-off value of configuration switch amount；The second is being used to change Parameter word display pattern, which simultaneously there is pressure on the number to show, the output of 4-20mA signal and two-way switch amount export Function and RS485 communication, are able to satisfy industrial requirement, and since the transmitter has multiple functions, an instrument can support three Platform or two other pressure gauges, overcome the insufficient defect of their functions, reduce installation space and pressure interface, improve In addition the reliability of measurement can also reduce the acquisition expenses of measuring instrumentss.

Detailed description of the invention

Fig. 1 is Tthe utility model system schematic diagram.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work Every other embodiment obtained, fall within the protection scope of the utility model.

Referring to Fig. 1, multi-form output digital pressure transducer, including the extraneous pressure sensor of connection and for showing Numeric display unit and key and power supply for operation, digital display pattern have three classes: one kind is the corresponding pressure of display Force value；One kind be display with by the corresponding 4-20mA current value of measuring pressure；The percent value of another kind of display measurement pressure, pressure The output end of sensor is unidirectionally electrically connected with pre-amplification circuit, and the output end of pre-amplification circuit is unidirectionally electrically connected with A/D and turns Parallel operation, the output end of A/D converter are unidirectionally electrically connected with CPU, and the output end of CPU is unidirectionally electrically connected with the first driving electricity respectively Road, the second driving circuit and D/A converter, the output end of the first driving circuit are unidirectionally electrically connected with the output of first switch amount, the The output end of two driving circuits is unidirectionally electrically connected with the output of second switch amount, and the output end of D/A converter is unidirectionally electrically connected with V/I Converter, the output end of V/I converter are unidirectionally electrically connected with standard current signal, and the output end of power supply is electric with preposition amplification respectively Road, the output of second switch amount, D/A converter and V/I converter input terminal be unidirectionally electrically connected, the output end point of pressure sensor The input terminal not exported with numeric display unit, A/D converter, CPU and first switch amount is two-way to be electrically connected, the output end of CPU It is unidirectionally electrically connected with the input terminal of numeric display unit, the output end of the CPU and input terminal of key is two-way is electrically connected, first switch Measure the output end of output with the input terminal of numeric display unit is two-way is electrically connected, the output end of the first driving circuit drives with second The two-way electrical connection of the input terminal of circuit, the output end of CPU are unidirectionally electrically connected with communication interface, and communication interface is RS485 interface, mark The current value range of quasi- current signal is 4-20mA, by the setting of key, one is being used to the on-off value of configuration switch amount；Its Second is that being used to change digital display pattern, which simultaneously there is pressure on the number to show, 4-20mA signal exports and two tunnels Output switch parameter function and RS485 communication, are able to satisfy industrial requirement, since the transmitter has a multiple functions, one Instrument can support three or two other pressure gauges, overcome the insufficient defect of their functions, reduce installation space and pressure Interface improves the reliability of measurement, in addition can also reduce the acquisition expenses of measuring instrumentss, aobvious by pressure sensor, number Showing device, key, pre-amplification circuit, A/D converter, CPU, the first driving circuit, the second driving circuit, D/A converter, One output switch parameter, second switch amount export and the setting of V/I converter, and solving pressure gauge function in the prior art has Limit cannot be provided simultaneously with pressure and show, export the problem of requirement that 4-20mA unified signal and switching value and RS485 are communicated, The multi-form output digital pressure transducer has the advantages of band two-way switching value output, is worthy to be popularized.

Working principle: under the action of measuring pressure, pressure sensor is deformed, so as to cause the bridge of its measuring bridge Arm resistance changes, and output one voltage signal related with measurement pressure, this voltage signal puts big processing of circuit before menstruation After send to A/D converter, analog physical amount (voltage) is converted digital quantity by A/D converter, and digital quantity is after CPU is handled, one Road shows measured pressure value to numeric display unit, all the way to the first driving circuit and to be transferred to first switch amount defeated Out, to the second driving circuit and it is transferred to the output of second switch amount all the way, there are also all the way to D/A converter, again by D/A converter Conversion to analog quantity, analog quantity is converted into the corresponding magnitude of current again through V/I converter, and then output is corresponding with measurement pressure 4-20mA standard current signal.

While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art, It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.

Claims (7)

1. multi-form output digital pressure transducer, including the extraneous pressure sensor of connection and for the number display dress of display Set and for operation key and power supply, it is characterised in that: the output end of the pressure sensor is unidirectionally electrically connected with preposition Amplifying circuit, the output end of the pre-amplification circuit are unidirectionally electrically connected with A/D converter, the output end of the A/D converter It unidirectionally is electrically connected with CPU, the output end of the CPU is unidirectionally electrically connected with the first driving circuit, the second driving circuit and D/A respectively Converter, the output end of first driving circuit are unidirectionally electrically connected with the output of first switch amount, second driving circuit Output end is unidirectionally electrically connected with the output of second switch amount, and the output end of the D/A converter is unidirectionally electrically connected with V/I converter, The output end of the V/I converter is unidirectionally electrically connected with standard current signal.

2. multi-form output digital pressure transducer according to claim 1, it is characterised in that: the output end of the power supply It is unidirectionally electrically connected with the input terminal of pre-amplification circuit, the output of second switch amount, D/A converter and V/I converter respectively.

3. multi-form output digital pressure transducer according to claim 1, it is characterised in that: the pressure sensor The input terminal that output end is exported with numeric display unit, A/D converter, CPU and first switch amount respectively is two-way to be electrically connected.

4. multi-form output digital pressure transducer according to claim 1, it is characterised in that: the output end of the CPU It is unidirectionally electrically connected with the input terminal of numeric display unit, the output end of the CPU and input terminal of key is two-way is electrically connected.

5. multi-form output digital pressure transducer according to claim 1, it is characterised in that: the first switch amount is defeated Output end out with the input terminal of numeric display unit is two-way is electrically connected, the output end of first driving circuit and the second driving The two-way electrical connection of the input terminal of circuit.

6. multi-form output digital pressure transducer according to claim 1, it is characterised in that: the output end of the CPU It is unidirectionally electrically connected with communication interface, the communication interface is RS485 interface.

7. multi-form output digital pressure transducer according to claim 1, it is characterised in that: the standard current signal Current value range be 4-20mA.