SunYuan ISO 4-20mA-O is a two-wire passive 4-20mA to voltage signal isolation converter IC.，It can isolate the input active 4-20mA current signal into voltage signal output. The IC adopts two-wire input circuit power supply mode, unique high-efficiency signal circuit stealing technology, without external working power supply. It greatly simplifies the user's design and reduces the user's wiring cost. The module contains internal current signal modulation and demodulation circuits, signal coupling and isolation conversion circuits, power inversion circuits, subtraction circuits, and buffer processing output circuits. The very small input equivalent resistance enables the IC to collect current signals from the sensor signal output loop and achieve a voltage drop of ≤10V when inputting a 20mA signal to meet the user's need for long-distance, distortion-free signal transmission without an external auxiliary power supply.

         ISO 4-20mA-O is often used for isolation of 4-20mA current to voltage signals, eliminating the need for an external power supply to make wiring more simple, and low power consumption, low self-heat (basically no temperature rise), high reliability. The most important feature of the product is that it does not require an external auxiliary power supply and contains internal subtraction circuits and amplifier buffer output circuits, which bring the advantages of simplicity and reliability as well as limitations in use. Products for sensors, PLC output 4-20mA signal isolation and transmission, from another definition is the transmission of electrical power, so there must be internal power loss. This loss is expressed in the input current value and its own input voltage drop product. In this case the 4-20mA signal source must have the ability to drive a 500Ω load in order to make the two-wire passive 4-20mA to voltage signal isolation converter ISO 4-20mA-O work properly. At present, from the industrial field practical application experience, most of the field instruments and sensors, PLCDCS, etc. can meet the 4-20mA signal output has the ability to drive 500Ω load. If customers need to drive low load products on site, please contact Shunyuan Technology Company to solve the problem.

          In the industrial field practical applications, some although only use a I / V conversion sampling resistor, can be converted to the input current signal into a voltage signal. This circuit is simple but impractical. First of all, its practical significance is that when the zero signal is zeroed, there will be a zero current flowing through the sampling resistor, and if it is analyzed according to the conversion of the 4~20mA input current to the maximum 5V voltage, the zero is exactly 1V, and this 1V can be subtracted from it by the microcontroller software when the microcontroller has enough resources. But then, its useful voltage will be left with 5-1=4VDC instead of 5VDC. As the maximum input voltage of the microcontroller's A/D is the microcontroller's power supply voltage, which is usually 5 VDC, it is more troublesome to deal with this simple input conversion circuit, in order to achieve the number of bits of A/D conversion, which will lead to an increase in the cost of the chip. A simple way to solve the above problem is to configure the input of the microcontroller before an operational amplifier composed of subtraction and buffer processing circuitry to increase this level of circuitry can play on the processing of the zero point becomes more convenient, without the need to use up the internal resources of the microcontroller, especially the microcontroller is to use the A/D interface to accept this zero-point signals and the actual value of the zero-voltage inputs, you can ensure that the number of bits of the resources of the A/D converter can be fully applied to the useful signal.

Product Selection Example    

Example 1: Input signal: 4-20 mA; Output signal: 0-5V; Model No.: ISO 4-20mA-O4  

Example 2: Input signal: 4-20 mA; Output signal: 1-5V; Model No.: ISO 4-20mA-O6  

Example 3: Input signal: 4-20 mA; Output signal: 0-2.5V; Product Model: ISO 4-20mA-O2.5  

Example 4: Input signal: 4-20 mA; Output signal: 0-3.3V; Model No.: ISO 4-20mA-O3.3

IC Packaging Product External Dimensions and Typical Application Diagrams

DIN3 ISO 4-20mA-O Series Single Low Cost, Small Footprint Standard DIN35 DIN Rail Mount Product Pinout Function Description

The DIN3 ISO 4-20mA-O series utilizes an ultra-thin (12.5mm thickness), standard DIN35 rail mounting base. Embedded with the ISO 4-20mA-O series integrated module, the terminal blocks are used as input and output connections. The products are free of zero and fullness adjustments, making them easy to use.  

 Due to the limitation of product size, DIN3 series small size DIN rail mounting products can only realize one inlet and one outlet isolation conversion function.

Typical Applications for Multi-Channel DIN 1X1/2X2/3X3 Type I Products

        SUNYUAN I-type guide standard DIN35 rail-mounted multi-channel two-wire passive 4-20mA to voltage signal isolation converter, the internal use of the installation of a number of ISO 4-20mA-O series of integrated modules, the product does not need to be supplied with power to achieve a one-in&one-out (DIN1X1), two-in&two-out (DIN2X2), three-in&three-out (DIN3X3) and other multi-channel two-wire passive current to voltage isolation converter function. Isolated conversion function from current to voltage. The product meets the 3000VDC isolation between input/output and each channel without zero and fullness adjustment. The internal anti-surge suppression protection circuit is added to make the product more convenient to use, more safe and reliable.

Passive 2-wire analog signal current to voltage (IV conversion) transmitters: ISO 4-20mA-O/SY 4-20mA-O Series 

10KV high isolation passive two-wire analog signal current to voltage (IV conversion) isolation transmitter ISOH4-20mA-O series

Two-wire Passive Analog Signal Isolator|Isolation Amplifier|Isolation Transmitter New Product Introduction

Introduction: Passive, in terms of electronics, it means that the circuit can work when there is a signal without a power supply. Usually, devices that can work without a power supply are called passive devices. The commonly used passive components in circuits are mainly diodes and resistors. , Inductance and capacitance components. The devices in the circuit that require an external auxiliary power supply to work normally are called active devices. Active devices are generally used to isolate and amplify signals, convert and transmit, and so on. Commonly used active devices are transistors, power amplifiers, signal transmitters, isolation amplifiers, field effect transistors, thyristors and other devices. According to the current industrial Internet's matching needs of various sensors, transmitters and PLC, DCS systems in the industrial field, Shunyuan Technology has launched a series of new products of low-cost, small-volume passive (no external auxiliary power supply) analog signal isolators , Provided to sensor and instrument manufacturers and industrial Internet system integration design engineers to choose. The following recommend several new two-wire 4-20mA output passive analog signal isolation transmitter optional technical solutions, for manufacturers and industrial Internet system integration engineers on-site application reference.

Signal isolator new product 1: Passive DC unidirectional voltage current, electronic ruler displacement resistance signal to two-wire current signal isolator

Passive displacement resistance signal (ISO R-O), analog voltage signal (ISO U-O), analog current signal (ISO A-O) transmitter is the industry's smallest volume and low cost passive loop-fed analog signal isolation transmitter IC . The IC has a unique high-efficiency signal coupling transformer loop feeding technology, which provides power supply operation through the subsequent current output loop feeding mode, without the need for an external working power supply. The IC is matched with sensors, instrumentation, PLC/DCS in the design plan, can adapt to various specifications of analog voltage, current or displacement resistance signal input, and amplify the active signal of industrial field two-wire/three-wire/four-wire general sensor After conditioning and isolation and transmission, it outputs 4-20mA/2-10mA/4-12mA/4-8mA/12-20mA and other two-wire analog current signals with various parameters. The core components in the technical solution: Passive displacement resistance signal (ISO R-O), analog voltage signal (ISO U-O), current signal (ISO A-O) The transmitter is designed as a high-precision, small-volume standard SIP12 Pin flame-retardant IC package , It adopts a unique magnetic isolation coupling method and high-efficiency post-feeding technology, which can realize DC voltage, current, one-way signal and angular displacement, electronic ruler, potentiometer and other analog signals to the two-wire loop feed current The precise isolation conversion of the ring signal matches the standard analog input ports of various types of instruments (such as PLC, DCS, FCS). The core products of the solution include small-volume IC package PCB board mounting and DIN35 standard rail mounting. The DIN rail mounting method can realize signal one in and one out, one in and two out, one in and three out, and two in and two for industrial sites. Output, four-way, eight-way, and sixteen-way signal isolation conversion function, users can choose technical solutions according to site needs.

Detailed technical 

information: https://www.sunyuansz.com/uploads/soft/210811/2-210Q1103Q2.pdf
 

New product of signal isolator 2: Passive low-cost, small-sized two-wire 4-20mA (0-20mA) current loop analog signal isolator:
Two-wire passive ISO 4-20mA (SIP12 Pin package) and ISOS 4-20mA (SIP7 Pin package) 4-20mA current loop signal isolator. It is a front-end 4-20mA (0-20mA) current signal input , Passive signal isolation module with 4-20mA (0-20mA) current signal output. The solution uses a unique electromagnetic isolation mode and high-efficiency input loop power stealing technology, which effectively solves the dependence of the transmission current signal isolation between the instrumentation and the sensor on the power supply, and realizes the 4-20mA (0-20mA) standard signal High precision and high linearity isolation. In the scheme design, the passive signal isolator obtains energy from the current loop of the sensor, and outputs an active 4-20mA analog signal after isolation to drive or control instrumentation, PLC, and DCS devices. The core products of the solution include small-volume IC package PCB board mounting and DIN35 standard rail mounting. DIN rail mounting can realize multiple signals such as one in and one out, two in and two out, and three in and three out for industrial sites. With the isolation conversion function, the user can choose the scheme according to the needs of the scene.

Detailed technical information: http://0032.psznh.cn/static/upload/file/20230906/1693993393454775.pdf

New product of signal isolator 3: Passive low-cost, small-sized two-wire 4-20mA loop-fed analog signal isolator
ISO 4-20mA-F (SIP12 Pin) and ISOS 4-20mA-F (SIP7 Pin package) 4-20mA current loop signal isolation distributors are two-wire loop-powered isolation modules. Through the post-feeding mode, it supplies power to the front-level two-wire equipment, and receives the 4-20mA current signal output from the two-wire equipment, and outputs a 4-20mA current signal to the sensor after being isolated by the module. This solution adopts a unique electromagnetic isolation mode and high-efficiency post-feeding technology, which effectively solves the dependence of current signal isolation on the power supply, and realizes the accurate isolation and transmission of standard signals of 4-20mA, which can be connected to two-wire with various instruments. Control loop power supply analog input ports (such as PLC, DCS system, etc.) to match.

Detailed technical 

information: https://www.sunyuansz.com/uploads/soft/210811/2-210Q1102521.pdf
 
New signal isolator 4: Passive low-cost, small-size analog voltage to two-wire 4-20mA current signal V/I conversion signal isolator
ISO V-4-20mA (SIP12 Pin) and ISOS V-4-20mA (SIP 7Pin) passive V/I conversion analog signal isolation transmitter, is a voltage input, two-wire current output loop power supply signal Isolate the transmission module. Provides a set of 5V (3mA) functional expansion power supply to the input terminal through the power feeding mode of the back-end current loop to supply power to the front-end equipment, and receives the voltage signal output from the front-end equipment. Wire current signal. This solution uses a unique electromagnetic isolation mode and high-efficiency post-feed technology to achieve precise isolation conversion from voltage signals to 4-20mA standard signals, and can be connected to the analog input ports of various instruments (such as PLC, DCS systems, etc.) Match. This technical solution is very convenient to use, and can realize voltage signal input, displacement potentiometer, and other voltage signal isolation transmission that require power distribution type sensors or bridge (weighing) detection circuits without any additional components.。

Detailed technical 

information:  https://www.sunyuansz.com/uploads/soft/210811/2-210Q1103110.pdf

New signal isolator 5: Passive low-cost two-wire 4-20mA current to analog voltage signal I/V conversion signal isolator
ISO 4-20mA-O series (SIP12 Pin package) two-wire passive 4-20mA to voltage signal isolation converter, which can isolate the input active 4-20mA current signal and convert it into a voltage signal I/V conversion output. This solution uses a two-wire input loop power supply mode, unique high-efficiency signal loop power stealing technology, no external working power supply, greatly simplifies the user's design, and reduces user wiring costs. The module contains current signal modulation and demodulation circuit, signal coupling isolation conversion circuit, power inverter circuit, subtraction circuit, buffer processing output circuit, etc. The small input equivalent resistance enables the product to be from the sensor signal output loop Collect the current signal, and can reach the voltage drop ≤ 10V when the 20mA signal is input. In order to meet the needs of users to realize long-distance and distortion-free transmission and conversion of signals without an external auxiliary power supply.

Detailed technical 

information: https://www.sunyuansz.com/uploads/soft/210811/2-210Q1102952.pdf

New Signal Isolator 6: Passive low-cost, small-volume two-wire 4-20mA current loop signal isolator
ISO 4-20mA-E (SIP12 Pin package) and ISOS 4-20mA-E (SIP7 Pin) two-wire passive 4-20mA analog isolation conditioning controller, which can convert the input active 4-20mA current signal into Isolated passive control signal output, used to control the two-wire loop power supply (explosion-proof mode) 4-20mA current loop, to achieve the on-site matching of sensor signal acquisition and analog input interface active load, which effectively solves the problem of collecting active 4- The 20mA current signal conflicts with the power supply of the receiving port of the two-wire current loop power supply loop. This solution adopts high-efficiency loop power stealing technology, no independent power supply is needed, and it is very convenient to use. Users can adjust the potentiometer for ADJ correction.

Detailed technical 

information: https://www.sunyuansz.com/uploads/soft/210811/2-210Q1102924.pdf

New Signal Isolator 7: Passive low cost, small size two-wire PWM signal to analog signal isolator
ISO D-O1 series (SIP8 Pin package) is a passive type PWM pulse width modulation signal isolation and conversion to a two-wire 4-20mA transmitter IC. The working mode of this IC is to receive the PWM signal from the front-end device through the current loop feeding mode of the back stage (output end), and output the corresponding 4-20mA standard two-wire current signal after isolation conversion. The PWM pulse width transmitter solution is designed as a SIP8 Pin (single row 8-pin in-line package) small-size PCB board welding installation method. The IC contains a signal coupling high-speed isolation conversion circuit, a precision reference voltage source switch control circuit, and a low-pass filter. The circuit, drive amplifier circuit, VI conversion circuit, etc., have the characteristics of high PWM signal conversion accuracy, good linearity, and wide output loop power supply voltage range (12-36VDC). The highly integrated process structure and new technology isolation measures enable the core components in the program to achieve: signal input and output 3000VDC isolation, and can meet the requirements of industrial-grade harsh working environment with wide temperature, humidity and vibration.

Detailed technical 

information: https://www.sunyuansz.com/uploads/soft/210811/2-210Q1113501.pdf

New signal isolator 8: Passive two-wire Pt100/Cu50 thermal resistance temperature measurement signal loop feed signal isolator
ISO ZW-O1 small size (12-pin single in-line IC package SIP12 Pin) low-cost passive two-wire 4-20mA loop-fed thermal resistance signal isolation transmitter, mainly used for three-wire, four-wire or two-wire system Pt10 / Pt100 / Pt1000 or Cu50/Cu100 temperature sensor signal collection, isolation and transmission. The solution is used in the temperature detection of industrial sites, and the temperature signal collected by the thermal resistance sensor can be converted into a linearly proportional standard 4-20mA current signal output according to the amount of change.

ISO ZW-O1 adopts the electromagnetic isolation mode and the patented technology of high-efficiency post-feeding invention. It can realize the precise isolation conversion from the temperature signal output by the thermal resistance sensor to the 4-20mA standard signal without an independent power supply. It can be directly used with all kinds of common The analog input ports of instruments (such as PLC, DCS system, etc.) match. The IC contains signal modulation and demodulation circuit, signal coupling isolation conversion circuit, high-efficiency DC-DC boost circuit, signal zero point, full-scale calibration circuit and Pt100 thermal resistance linearization, long-line compensation, interference suppression circuit, etc. The output circuit has a wide power supply voltage range (12-36VDC), high conversion accuracy, and good linearity. The full scale and zero point can be adjusted and calibrated on-site by the user through an external potentiometer.

Detailed technical 

information: https://www.sunyuansz.com/uploads/soft/210811/2-210Q1104612.pdf

New signal isolator 9: Passive two-wire alternating current (AC) current and voltage signal to 4-20mA analog signal isolator

DIN ISO AC-O1 series AC to DC (AC/DC) passive two-wire signal isolation transmitter is an isolation transformer that can output the DC standard 4-20mA current signal in linear proportion to the measured AC current and voltage Sender. Equipped with corresponding indicating instruments or directly delivered to the DCS/FCS system to realize the system's measurement and control of AC voltage or current. The output of this module is designed for the two-wire power supply circuit connected in series with 24VDC and sampling resistance (two-wire instrument), which is the same as the analog input interface board (host computer), PLC, DCS or other instruments commonly used in the industrial field. The input ports match. The high-efficiency loop power stealing technology is selected in the scheme design without the need for independent power supply. The two-wire loop power supply output mode adopted can save two power lines, which greatly simplifies the user's system scheme design and reduces the user's wiring cost.
In the scheme design, the working power circuit of the indicating instrument, PLC or DCS in the system is fully used to completely isolate the input circuit device of the signal from the output detection control loop, which improves the reliability and stability of the system operation, and fully guarantees and improves The safety factor of equipment and staff, so this program is widely used in the fields of electric power remote monitoring, electric power instrumentation, medical equipment, industrial automatic control and so on.

Detailed technical information: https://www.sunyuansz.com/uploads/soft/210811/2-210Q1133U6.pdf