Two-wire passive 4-20mA loop feed intelligent transmission meter:DIN 1X1 ISO 4-20mA-F (LED)
Product Category: Passive Intelligent Isolation Amplifier with LED Display
Input: 4-20mA Output: 4-20mA
Power: -- Isolation Voltage: 3000VDC
Package: DIN35 Traffic Watch: times
Remarks: Two-wire passive 4-20mA loop feed intelligent transmission meter
Product Description
Two-wire passive 4-20mA loop feed intelligent transmission meter:DIN 1X1 ISO 4-20mA-F (LED)

Features 
● High-precision and intuitive display of input loop current value for on-site debugging and monitoring
● Four LED digital display, high precision, display resolution at the end of ± 2 words
● Programmable setting of two-way lower limit isolated switch alarm signal output
● 4-20mA current input and output precision, accuracy level: 0.2, 0.5
● Non-linearity <0.2% in full scale
● Provide power distribution to the sensor: 12V ~ 18.5VDC
● Signal input and output 3KVDC high isolation
● Two-wire 4-20mA signal loop (explosion proof) input mode
● Two-wire 4-20mA distribution circuit active output mode
● Frequency response (small signal bandwidth): 100HZ (Io=20mA)
● Low cost, small size standard DIN35 rail mounting
● Industrial temperature range: - 25 ° C ~ + 70 ° C
 
typical application 
● Industrial site 4-20mA signal isolation and long-distance transmission
● PLC\DCS input channel signal acquisition isolation anti-interference
● Ground loop isolation and interference suppression
● Reliable transmission and reception monitoring between instrumentation signals and sensors
● Analog signal data acquisition isolation and long-line distortion-free transmission
● Power instrumentation, medical equipment monitoring isolation barrier
● Rail transit DC high voltage monitoring isolation safety barrier
● Two-wire passive sensor power supply and signal transmission
● Industrial equipment operation measurement, monitoring and remote control
● Oil, chemical, environmental protection, mining system control point monitoring
● Temperature, pressure, flow, liquid level signal monitoring display
● Sensor, transmitter working status display

SunYuan DIN 1X1 ISO 4-20mA-F (LED) is an intelligent two-wire passive sensor 4-20mA signal isolation display distributor that uses low-power loop stealing technology to display, alarm, and isolate transmissions. Power distribution in one, the product contains current signal modulation and demodulation circuit, signal coupling isolation conversion circuit, display and alarm control circuit, a high efficiency DC-DC circuit. The product can transmit 4-20 mA signals from PLC, DCS, PCC and other control systems to two-wire sensors or smart meters, which facilitates signal measurement, remote transmission, isolation, display and other functions of some two-wire passive sensors. The IC output is designed for a two-wire power supply loop (on-site explosion-proof function) in which 24VDC and sampling resistors (or load resistors) are connected in series. It is the same as the commonly used analog input interface board (host computer), PLC, DCS or other. The analog input and output interfaces of the meter match. The internal integrated process and new technology isolation measures enable the device to meet the harsh environmental requirements of 3KDC insulation voltage and industrial grade wide temperature, humidity and vibration. DIN1X1 ED-ISO 4-20mA-F series products are very convenient to use, adopt standard DIN35 rail type installation design, which is convenient for users to install and use. The product can realize 4-20mA current loop isolation and signal display function without external components.
   
  The DIN 1X1 ISO 4-20mA-F (LED) product is intelligently designed with a variety of functions not found in traditional products. The product is a passive design that isolates the 4-20 mA analog input in the input loop. Send, and display it in decimal digits according to the set range. The two-wire passive type working mode does not require other auxiliary power supply, so the wiring is simple and convenient, small in size, high in precision, and low in cost. The traditional embedded analog display meter is adjusted by a potentiometer, and the adjustment parameters are single, inflexible, and greatly affected by temperature. Compared with the traditional analog display table, this intelligent digital display table is operated by two key combinations and controlled by the central processing unit CPU, which can realize setting of various parameters such as zero point, full scale, decimal point, alarm and delay. , with strong flexibility and practicality. The digital display meter adopts an LED display panel, and each section of the display panel is driven by a constant current to make the brightness in the range of 4-20 mA uniform, and has a reverse and overcurrent protection function. The products are widely used in industrial control, petrochemical, environmental protection, smart home, mining and other industries to monitor the temperature, pressure, displacement, flow, liquid level and other physical quantity control points.
   
  DIN 1X1 ISO 4-20mA-F (LED) products are mainly used for isolation and display of 4-20mA current signals for sensor power distribution, PLC, DCS control loop. Its embedded digital display is used to measure the 4-20 mA signal and can be directly measured on the 4-20 mA loop signal without external power supply. The displayed number is not a direct current measurement, but a preset value of 4 mA, 20 mA, and the measured current value is linearly displayed relative to the two preset values. For example: 4mA is set to 0, 20mA is set to 8000, then the meter will display 2000 when inputting 8mA, 4000 will be displayed when inputting 12mA; if the 4mA is set to 1000, 20mA is set to -1000, when inputting 12mA, the watch will be 0 will be displayed, and the table will display -500 when 16 mA is input. The maximum display range of the digital display is 9999, which is four digits; the minimum is -1999. At the same time, it has alarm signal output function with two isolated switch outputs, which can display, control and alarm on the spot. Two alarm points are set and there are positive and negative alarm direction settings. The alarm object of the alarm point is for the display reading. The last decimal point of the LED panel flashes during the alarm, and the alarm information is isolated and output by the digital optocoupler. For products that need to set the alarm function, the upper or lower limit alarm value and alarm mode can be modified by the programmer. For detailed setting method, please refer to the “Display Table User Manual”.
Remark: The alarm signal is the OC gate (open collector) output. For the specific application, please refer to [Alarm Output and Application].

Alarm output and application
1. The DC level signal generated by the two-way alarm signal in the main CPU chip is isolated and output by the optocoupler. The output low level indicates the alarm state, and the output high level is the non-alarm state.
2. Because the display controller is passive two-wire system, the minimum working current is 3mA, so the alarm signal is also very weak, the minimum is only 0.5mA. The signal is isolated by a phototransistor type photocoupler with a strong current spreading capability, and an open collector (OC gate) output is used. The output is connected to the pull-up voltage, and the current can be expanded up to 120mA. The principle of this phototransistor type photocoupler is shown in the figure below: the instrument signal is isolated by optocoupler, 5, 6 "1H /1L", 7, 8 "2L /2 H" wiring port is optocoupler OC gate The output end of the signal is connected to the external power supply circuit of the instrument, and further amplifies and energizes the alarm signal, and finally reaches an actuator that can drive the required sound, light, electricity, refrigeration, heating, and motor. 5, 6 "1H / 1L" is the first alarm output, 7, 8 "2L /2 H" is the second alarm output, "1H", "2H" connected to the phototransistor collector, "1L", "2L emitter.


3. Due to the limitation of the maximum current of the phototransistor Ic, its expansion and driving load capacity is limited. If the user needs more driving current, it can be used to drive relays, solenoid valves, stepping motors and other devices on site, and can externally connect the power expansion circuit. The power amplifier tube or servo circuit is subjected to current amplification and special processing.
   
   
Order selection instructions
Please read the entire contents of this manual carefully before ordering to determine whether the product meets the user's on-site application and is correctly selected.
1. The factory default setting of this product is set to “0.0” by 4mA and “200.0” by 20 mA.
2. When ordering, the user should first put forward the display specification requirements. We will adjust the digital display meter before leaving the factory, which is convenient for users to use directly.
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