working principle:

first instrument or transmitter signal semiconductor devices through the modulation transform, and then through optical or magnetic sense of a sense of isolation devices to carry out the conversion, and then transform back to the demodulator to carry out before the isolation of the original signal, and at the same time the isolation of the signal after the power supply For dealing with isolation. After the transformation to ensure that the signal, power supply, between absolute independence.

features:

one: the protection of the lower control loop.

Second: to weaken environmental noise impact on the test circuit.

three: to contain public ground, inverter, solenoid valves and equipment for impulse unknown interference; at the same time the lower limit of pressure equipment, the amount of flow is a function of the transmitter, the instrument, inverter, solenoid valve PLC / DCS input and output Communications interface and a loyal protection. Standard Series rail structure, easy to install, can be an effective isolation: input, output and power between the earth and potential. Converter will be able to overcome all kinds of high-low-frequency noise and interference pulse.

signal isolators What are the main types?

1) isolation: industrial production in order to increase capacity and ensure the instrument connected to the same instrument among non-interfering signals to improve electrical safety. The need to input voltage, current or frequency, resistance signals, such as acquisition, amplification, computing, and anti-treated, and then isolate the output current and voltage signal to the security or instrument War plc \ dcs use.

2) electrical distribution: the industrial scene in general require a two-wire transmission, it is necessary for the transmitter, and other instruments to provide a 24V power distribution, while at the same time on the current input signal acquisition, amplification, computing, and Anti-treated, and then isolate the output current and voltage signal for the back of the second instrument or other instruments to use.

3) An Quanshan: some of the special industrial site (such as chemical plants and gas company) need to not only the two-wire transmission, provided both power and signal distribution function of isolation, but also need to have a spark-proof safety performance, reliable Power to curb the power to prevent the supply, and the signal between the ignition, current limiting, double step-down and supply restrictions signal loop, to enter dangerous places restrictions on energy in a safe quotas.

signal isolators should pay attention to the maintenance of the installation of what?

as a result of different manufacturers, the isolator production process, the wiring does not have the same definition, but essentially the same occasion, the products of the requirements for protecting and safeguarding the same.

1. Should be used carefully read the prospectus before.

2. As a signal the use of isolation, should be input into the string loop circuit, the output sample loop termination.

3. The use of isolation as a distribution, should be input into the power circuit, the transmitter output termination.

4. If the work should check whether the wiring is correct, the attention of any power anyway, and polarity.

why sometimes PLC received on-site error signal and stability of the big difference?

the problems are caused a lot of different instruments signal reference point between the potential difference is an important factor. Due to this "gap" caused by instrument signal interference between the current PLC led to large errors and poor stability. Therefore, different equipment, the instrument signal a common reference point is the best situation. Separation allows / O electrical completely isolated in the PLC analog interface board to form a common reference point to achieve the ideal situation to solve the problem.

on the 4-20mA channel isolation, and the cabinet did not put the power of space, how do?

a passive signal isolation, it can achieve 4-20mA signal isolation and without external power supply. PH1033 that such products. Now the market there are so many brands of isolation, the price varied, how the choice? Isolator system located in the channel between the two, so I chose to first determine the isolator input and output functions at the same time to input and output isolators mode (voltage, current-mode, loop-powered, and so on) meet the client before and after the channel interface mode. In addition there are precision Power       noise insulation strength   bus communications and many other important functions related to product performance parameters, such as: noise and the accuracy, reliability and thermal power, these users need to selection. In short, to apply, reliable and cost-effective product is the choice of the main principles of the isolator.

DCS received at the scene of the second-line pressure transmitter signal instability in the system, how to solve?

second transmitter system in the field of industrial automation in the use of high frequency, and other industrial equipment at the scene the same as second-line system transmitter there and anti-interference. DCS simulation based on the plate interface model (or current-loop-powered) selection of features different distribution of electrical isolation, in principle, it can require the provision of isolation transmitter power to ensure that each transmitter has an independent power supply, Transmitter signal can be transmitted to the isolation DCS. PLC simulation is the second-board interface circuit of the power supply, and signals the need for isolation, how to choose products? Second-line loop power supply is a common analog interface. And the interface with products known for second-line circuit-isolation products. This isolation within the transmitter device using isolation transformers way, on the one hand, the transmission of signals, and on the other side of the power supply will also be sent to the importation of some of the power to make the importation of various parts of the circuit to work properly. PH2217 cases, such as electrical distribution products. There are several common second-line electrical distribution system? Commonly used second-line electrical distribution system of separation of two species have the option series. The two series have in common is that all external power supply by the separation after the two-wire transmitter to provide an independent power isolation; distribution depends on the transmitter site allocated by the PLC, DCS analog transmission.

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