System for signal transmission from sensors with analogue output via a two-wireless line (options)

FIELD: measuring equipment.

SUBSTANCE: invention relates to devices for transmitting signals from analog sensors to a measuring system and can be used in stationary complexes of continuous monitoring of various physical quantities. System for transmitting signals from sensors with an analog output over a two-wire communication line contains a sensor with an analog output, control input node with controlled resistance, whose output is connected to the first end of one of the wires of the two-wire line, whose second ends are connected to the first and second contacts of the receiving unit, which contains a current collector resistor, as well as a source of constant voltage, whose negative bus is the common bus of the receiving node, and the first end of the second wire of the two-wire line is connected to the common terminal of the sensor with an analog output, whose power output is connected to the first end of the first wire of the two-wire line. Receiving unit comprises a current collector amplifier, whose inputs are connected to the terminals of the current collector resistor, and the output is the output of the signal.

EFFECT: technical result is increased noise immunity, reliability, reliability of functioning of elements having lower operating voltages.

21 cl, 10 dwg

 



 

Same patents:

FIELD: physics, signalling.

SUBSTANCE: invention relates to remote signalling systems. The system includes n measurement channels as part of sensors (1), converters (2), filters (3), amplifiers (4) level comparators (5), as well as a level setter (6), two switches (7, 10), a control device (8), m integrators (91-9m), a power supply with a converter (12, 13), an output data unit (17), a transmitter (18), a communication channel (19) and a receiver (20). The system includes: a selector (11), a zero-level comparator (14), a controlled count pulse generator (15) and a counter (16) - for analogue-to-digital conversion of alarm signals with controlled repetition frequency of count pulses; an error analyser (22), a comparison unit (23), an additional transmitter (24), a return communication channel (25) and an additional receiver (26) - for generating and transmitting an analogue-to-digital conversion circuit commands for controlling the duration of alarm signal elements, transmitted over the communication channel in interference conditions; a unit for displaying the state of objects (21) - for displaying the alarm signal level with refinement of the object and commands to change the repetition frequency of count pulses.

EFFECT: high noise-immunity of transmitting alarm information signals over a communication channel.

1 dwg

FIELD: instrumentation.

SUBSTANCE: invention relates to a divider of signal passage. For this purpose a divider of measurement signals passage is proposed with dead zero or live zero, which comprises: an inlet (IN) at the primary side, an outlet (OUT) at the secondary side, a DC converter (100) for transmission of inlet current Iin of the measurement signal at the primary side, an outlet cascade (200), comprising a transistor (T1), for provision of the outlet current Iout of the measurement signal at the secondary side, a power supply circuit (400) for supply of the auxiliary energy of the primary side and secondary side, a control device (300) for provision of the adjusted outlet voltage (UR), at the same time the auxiliary voltage of the power supply circuit (400) with auxiliary energy is adjusted at the secondary side by the controlled device (300) with the help of the measurement device (500) on the basis of the outlet voltage (UR) so that the loss of energy of the transistor (T1) of the outlet cascade (200) does not depend on the load (Rb), connected in the working condition, at the same time the measurement device (500) is configured to detect a collector potential of the transistor (T1) of the outlet cascade.

EFFECT: simplified design of a divider of signal passage and reduction of faults.

8 cl, 3 dwg

4-20ma transceiver // 2546576

FIELD: electricity.

SUBSTANCE: invention relates to the methods of measurement of the process parameters and remote transmission of obtained data. The invention offers 4-20 mA transceiver, containing series-connected into the current loop a receiver part comprising a current sensor, connected to an analogue-to-digital converter, parallel stabiliser, connected to the current sensor output, transmitting a part comprising a current source, connected to a parallel stabiliser output, and digital-to-analogue converter controlling a current source, a microcontroller with external power supply or powered from the parallel stabiliser for determination of a configuration of the analogue-to-digital converter and digital-to-analogue converter, meanwhile the analogue-to-digital converter and digital-to-analogue converter are connected to the parallel stabiliser output, and their digital interfaces directly or through a galvanic separation are connected to the microcontroller, and the transceiver input is the input of the current sensor, and the transceiver output is the output of the current source.

EFFECT: creation of reliable simple device functioning both as the 4-20 mA receiver, and the 4-20 mA sensor, powered from the current loop of this interface.

3 cl, 1 dwg

FIELD: radio engineering.

SUBSTANCE: system of data transfer with nanoresistors comprises a transmitter, a receiver and a wire communication line, the receiver is made in the form of a matrix from series-parallel connected nanoresistors connected at the outlet of the communication line and matched in resistance with a wave resistance of the communication line, the receiver comprises an infrared temperature metre, to a receiving optical element of which the infrared radiation of the active area in the matrix of nanoresistors is projected, at the same time the output of the infrared temperature metre is the output of the data transfer system.

EFFECT: expansion of functional capabilities of a device, improved linearity and accuracy of characteristics of amplitude modulators and amplitude detectors, increased sensitivity of a receiving part of a device.

2 cl, 2 dwg

FIELD: information technology.

SUBSTANCE: bus instrument (10) configured to predictively limit power consumption and adapted for use with a two-wire instrumentation bus is provided. The bus instrument (10) includes a sensor (13), a shunt regulator (14) and a controller (20). The controller (20) is configured to generate a predicted available power Ppredicted which will be available to the bus instrument (10) after a change in the loop current IL, compare the predicted available power Ppredicted to a present time power Pt0 comprising a controller power Pcontroller plus a sensor power Psensor, and reduce the sensor power Psensor if the total available power Pavailable is less than the controller power Pcontroller plus the sensor power Psensor.

EFFECT: high reliability of bus instrument.

10 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: device includes the first transceiving system (1), DC transmitter (4) in short-circuit mode, operating amplification device (5) and second transceiving system (2) with sensor (9) of information signal.

EFFECT: possibility of simultaneous bidirectional transfer of signals from two transceiving systems.

18 cl, 10 dwg

FIELD: electricity.

SUBSTANCE: device (12) of process control is configured for connection to double-wire circuit (18) of process control. Circuit (60) of process control is configured to apply outlet current to double-wire circuit (18) of process control. Circuit (64) of circuit current verification is connected to double-wire circuit (18) of process control and configured to detect errors in applied outlet current. At least part of circuit (64) of circuit current verification is independent on circuit (60) of circuit current withdrawal.

EFFECT: improved accuracy of process control.

22 cl, 16 dwg

FIELD: information technologies.

SUBSTANCE: wireless device for the manufacturing process, which is used in control and management system of the manufacturing process, includes power supply made with the possibility of feeding power to the device for the manufacturing process, a diagnostic scheme made with the possibility of performing diagnostic of power supply operation of the device for the manufacturing process and providing diagnostic output signal, a wireless communication scheme transmitting the information via wireless communication line.

EFFECT: performing diagnostics of power supply operation of process parametre transmitter.

42 cl, 4 dwg

FIELD: physics; control.

SUBSTANCE: present invention relates to automation, particularly to remote control of industrial processes. A two-conductor process transmitter (12) for use in controlling an industrial process (10) contains a communication circuit (82) on HART protocol and a communication circuit (86) on Fieldbus protocol for joining a two-conductor circuit (18) for controlling the process. The first pair of electrical leads (52) provides for connection of communication circuit (82) on HART protocol with the two-conductor circuit (18) for controlling the process in the first configuration, and the second pair of electrical leads (54) provides for connection of communication circuit (86) on Fieldbus protocol with the two-conductor circuit (18) for controlling the process in an alternative second configuration.

EFFECT: more functional capabilities of the device.

23 cl, 3 dwg, 1 tbl

FIELD: electricity.

SUBSTANCE: application: for field instrument powering. Electronic unit of field instrument contains current stabiliser with current flowing in it under action of supply voltage provided by external current source, internal operating-analysing circuit for field instrument control and internal feed circuit. Feed circuit comprises voltage regulator through which at least temporarily the first partial feed current flows and which provides electronic unit of field instrument with the first internal useful voltage which is essentially constantly adjusted and is kept on preset level, and the second voltage regulator over which at least temporarily the second partial feed current flows which provides electronic unit of field instrument with the second useful voltage varying within preset range, and voltage stabiliser through which at least temporarily the third partial feed current flows and which serves for adjusting and keeping internal input voltage on preset level. In operating-analysing circuit at least temporarily both the first useful current under action of the first useful voltage and the second useful current under action of the second useful voltage flows.

EFFECT: increase in efficiency factor of field instrument with power consumption optimization.

41 cl, 13 dwg

FIELD: electricity.

SUBSTANCE: electronic current transformer comprises an input measuring current transformer 2 with primary 3, measuring 4 and feedback 5 windings, a pre-amplifier 6, a phase changer 7, a controlled amplifier 8, a power amplifier 9, a current-limiting resistor 10, an output matching transformer 11 with primary 12 and secondary 13 windings. At that in the device there are also a current-setting resistor 14, an operational amplifier 15, a reference amplifier 16, a measuring resistance 17 and a comparison circuit 18.

EFFECT: reduced current and angular error, reduced weight, dimensions and costs of used basic specifications, expanding the range of measured currents, invariability of an electronic current transformer to change in the load resistance, increased temperature and timing stability.

1 dwg

FIELD: electricity.

SUBSTANCE: circuit contains an amplifier which has an inverting and non-inverting inputs and is designed with a possibility of amplification of difference of voltages of the first input signal and the second input signal. The first input signal is supplied to the non-inverting input through the first input section, the second input signal is given on the inverting input through the second input section. The circuit also contains the first signal line connecting the first input section to the amplifier; the second signal line connecting the second input section to the amplifier; the first capacitor, one end of which is connected to the first signal line; the second capacitor, one end of which is connected to the second signal line; the first filtering element with an inductive element and a resistive element and connected between the first capacitor and the amplifier series with the first signal line; and the second filtering element with an inductive element and a resistive element and connected between the second capacitor and the amplifier series with the second signal line.

EFFECT: prevention of worsening of accuracy of voltage measurement at the output of the amplifier.

4 cl, 2 dwg

FIELD: measurement equipment.

SUBSTANCE: invention relates to metrology and may be used to control energy quality. A device comprises a voltage transformer, signal level matchers by phases A, B and C, an ADC of phases A, B and C; temporary storage registers, a reference value storage register, circuits of comparison of the measurement result with the reference value, a mechanism of sample intervals setting, a reference value shaper for analogue-digital converters. The device also comprises a frequency measurement channel, which includes a level matcher, a mechanism of sample intervals setting, a reference voltage shaper, a level comparator, a timer-counter, circuits of comparison with the reference value. The channel for measurement of battery voltage comprises comparators of level by lower and upper voltage limit, reference voltage shapers, circuits of fault detection. Also the device comprises a channel of real-time clock. The device is controlled with a control unit that controls a controller of recording into a memory. Data arrives either to an electrically reprogrammable nonvolatile memory or to a controller of USB interface and RS-232 interface. The indication unit is made in the form of a panel of single indicators.

EFFECT: expansion of functional capabilities of a device.

4 cl, 1 dwg

FIELD: measurement equipment.

SUBSTANCE: substance of the proposed method and device of automated monitoring of technical condition of electrical equipment consists in provision of diagnostic space containing information criteria of electrical equipment failures in the form of vectors of digital sequence, from which the technical condition matrix is formed. Identification of technical condition and place of failure in electrical equipment is carried out on the basis of analysis of changes in digital sequences of formed matrices of technical condition. At the same time it is suggested to monitor technical condition of electrical equipment in two stages: at the first stage (analysis) they generate a library of reference descriptions of possible technical conditions of electrical equipment (information criteria of failures), and save them as reference matrices of technical condition, and the signal measured from the sensor of intensity of magnetic field converted into the matrix of technical condition is also saved; at the second stage (identification) they compare element by element the produced matrix of technical condition with reference matrices of technical condition, identify technical condition of electrical equipment by highest number of matches of elements of compared matrices.

EFFECT: increased efficiency and validity of identification of technical condition of electrical equipment.

8 cl, 9 dwg

FIELD: measurement equipment.

SUBSTANCE: invention relates to metrology, namely to current sensors. A shielded current sensor includes a magnetic conductor of a sensitive element with windings, which is placed in a magnetic shield representing a container of a wall, a base and a cover plate with holes, and an internal wall, which are connected to each other. The internal wall configuration corresponds to an outline of holes made in the base and the cover plate, and the base, the wall, the cover plate and the internal wall are made in the form of stranded magnetic conductors from a strip with a nanocrystalline structure.

EFFECT: improving accuracy of measurements under conditions of increased electromagnetic interference.

2 dwg

FIELD: measurement equipment.

SUBSTANCE: actual temperature of the fixing device and input voltage are detected. The value of change of actual temperature for the given period of time is calculated. The detected input voltage is compared with the pre-set voltage. The calculated actual temperature change and the first reference temperature change are compared, if the input voltage is more, than given voltage. The malfunction of the temperature sensor is identified, if the value of change of actual temperature is less, than value of change of first reference temperature. The calculated actual temperature change and the second reference temperature change are compared, if the input voltage is less than or equal to the given voltage. The malfunction of the temperature sensor is identified, if the actual temperature change is less than the second reference temperature change.

EFFECT: improvement of accuracy of determination of malfunction of a temperature sensor.

14 cl, 5 dwg

FIELD: measurement equipment.

SUBSTANCE: sensor comprises a measurement shunt, connected in series with a load, an operational amplifier (OA), a transformer, four interchanged switching links, an integrator, a control transistor of p-n-p type. The first output of the shunt is connected to the second output of the load. The second output of the shunt is connected to the switching contact of the second link. The first output of the load is connected to the switching contact of the first link. Normally open contacts of the first and fourth link are connected with a normally closed contact of the second link and a plus bus. The base of the transistor via the resistor is connected to the outlet of the OA and via the other resistor with the emitter of the transistor, and the emitter is connected to the plus output of the OA power supply and the plus bus. The minus output of the OA power supply is connected with the common bus. The collector of the transistor is connected to the inlet of the RC-filter, the outlet of which is connected to the buses of power supply of the introduced blocking generator, assembled with usage of the transistor, two resistors, a capacitor, a diode and two windings of the transformer. Two other windings with identical transformation ratios are connected to the introduced voltage multipliers. The outlet of the first multiplier is connected to the device outlet. The positive outlet of the second multiplier via the feedback resistor is connected to a non-inverting inlet of the OA, and the negative one - to an inverting inlet of the OA. The first divider is connected between the plus bus and the switching contact of the third link, and its outlet is connected to the inverting inlet of the OA. The second divider is connected between the switching contact of the fourth link and the common bus, and its outlet is connected to the non-inverting inlet of the OA. The balancing resistor with taps, which is connected to the balancing outputs of the OA. The fifth interchanged link is connected between the plus bus and one of the outlets of the balancing resistor.

EFFECT: simplification and increased reliability of a device.

1 dwg

Vibration meter // 2536097

FIELD: measurement equipment.

SUBSTANCE: vibration meter comprises a vibration converter, a parallel RC-circuit, the first operational amplifier, the first and second resistive dividers. To achieve the technical result, the second operational amplifier, the first, second and third capacitors, the serial RC-circuit, the resistor, the first, second and third diodes, the circuit of back-to-back diodes, an integrating circuit are introduced, being connected in accordance with the circuit on fig. 1.

EFFECT: expansion of functional capabilities during minimisation of a number of serially connected cascades.

3 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: according to the method data on the working state of power production equipment are obtained. Measured useful currents for each phase of the power production equipment are used as data characterising the working state of the power production equipment. At that the output of control commands for switching on increment of the run time meter is made only provided that the operating currents consumed by the power production equipment comply with their rated values for each specific mode with a deviation complying with the permitted rates. Besides readings of the incremented meter of the total no-failure run time are compared with the rated average run time values of the power production equipment specified in its certificate, and when the value is exceeded then ending of the run time for the power production equipment is signalled. Additionally the temperature of the monitored equipment and values of voltage supplied to it are measured. At that transfer of data on the total run time of the power production equipment, input of data on an average time between failures and the rated current values consumed by the power production equipment, as well as limit values of input voltage and temperature of the equipment is made through a wireless modem through a GSM channel and a cellular phone is used as a remote control panel. In case of emergency or upon request, upon transmitting an SMS message through the GSM channel all monitored data will be transferred to the remote control panel and recorded to the extracted flash memory. An apparatus which carries out the said method is also disclosed.

EFFECT: improved objectivity of the operating status control for the power production equipment and effective use of its work resource.

3 cl, 1 dwg

FIELD: measurement equipment.

SUBSTANCE: insulated current sensor comprises a sensitive element and a magnetic conductor. At the same time the sensitive element is a uniaxial integral current sensor. Also in the sensor they use a magnetic conductor of plate type, which is installed above the current-conducting bus in a plastic body fixed directly to the current-conducting bus with the help of a threaded fastening element.

EFFECT: increased efficiency and accuracy of measurements.

1 dwg

FIELD: electrical engineering.

SUBSTANCE: method comprises measuring instantaneous values of sinusoidal voltage and nonsinusoidal current in the circuit. The power averaged over the period and effective values of voltage and current can be judged from the digital readings of instantaneous values of sinusoidal voltage and nonsinusoidal current in the circuit. The phase of the equivalent sinusoid is determined from the ratio of the power to the product of their effective values.

EFFECT: enhanced accuracy of determining.

3 dwg, 2 tbl

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