Instrument and meter plant to let you know: why need signal isolator control system in the process of production, control system and monitoring system, are likely to face a complex environment interference, or short circuit, over voltage, the condition of unknown pulse, etc.
Therefore, protective fixation of control circuit, weaken the influence of environmental noise, the inhibition of earthing interference or equipment, has a limited pressure, flow, input and output protection control system and the communication interface of isolator, become an indispensable part of control system.
Signal isolator, the principle of the principle of signal isolator is the transmitter or instrument signal, through modulation conversion semiconductor devices, and then through the optical or magnetic induction device isolation switch, and then back to isolation before the original signal demodulation, at the same time for separate signal after the power supply of quarantine treatment, to ensure that the transformed signal, power supply, between absolute independence.
To overlay on the measured value at the same time the interference signal filtering, and in accordance with the requirements of control system input and output signals for matching, as a result, isolation, amplification, filter and matching is the role of signal isolator.
Some DCS module with photoelectric isolation function, in some systems can meet the demand of the normal work;
But the normal work of the system could not always, in the event of accident device is damaged, replace the isolator saving time and money for more than replace DCS module.
Instrument control your advice or need according to the actual situation to determine whether installing isolator.
The classification of signal isolator signal isolator points of passive and active signal isolator signal isolator.
Active signal isolator active signal isolator by an independent power supply, to ensure that the isolator work well, the module on the input side need active signal, they provided in the output test after filtering and amplification of signal, according to the application of isolation between the input/output and power supply.
Active signal isolator includes three end isolated, input and output end segregation.
Three-terminal isolated three-terminal only need a power, the power supply from the measurement circuit, using this technology isolation modules, they are all connected to the input, output, or the power components are not interfere with each other on three end between electrical isolation from each other.
Input isolation using this isolation technology module should protect the output side of the connection of electronic equipment (
For example, the controller input card)
From the scene of the various interference.
So, the input and the output of the equipotential and power partly electrical isolation.
Output isolation using this isolation technology module should protect the input side of the connection of electronic equipment (
For example, the controller output card)
From the scene of the various interference.
So, the output terminal and the input and the power of the equipotential partly electrical isolation.
Passive signal isolator passive signal isolator provides an additional and substantial convenience, no additional power supply, the module of the working power supply is provided through the input or output circuit, the internal circuit of current consumption, does not affect the correct signal transmission.
According to the power supply way of signal isolator input side power supply, the output side of power supply, passive feeder, etc.
Input side power supply using the isolation technology, these modules from active input circuit (
Such as the electromagnetic flowmeter or control system output card)
To obtain the energy needed for signal transmission and electrical isolation, after processing of current signal output side that are used to control or adjust.
Output side power supply using the isolation technology, these modules from the active output circuit (
The best use of auxiliary power supply control system input CARDS)
To obtain the energy needed for signal transmission and electrical isolation.
Passive feed isolator using the isolation technology, these modules from active output circuit to obtain the energy needed for signal transmission and electrical isolation, passive feed to this from the output circuit isolator for supply of energy is also a connection in the input side of the passive detection probe (
Such as pressure transmitter
, detecting probe signal a active, by means of providing energy by passive feed isolator electrical isolation and output from the output side.
Signal isolator how to choose the isolator is located between two systems channel, so select isolator must first determine the input and output function, at the same time to make the isolator input/output mode (
Power supply voltage, current, loop type, etc. )
To adapt to the front and back side channel 1:3 model.
In addition, there are accuracy, power consumption, noise, dielectric strength, bus communication function involves many important parameters, such as product performance, such as: heat noise associated with precision, power consumption and reliability, these users need to choose.
In a word, applicable, reliable, cost-effective products are the main principles of choosing isolator.
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