Abstract: the one-piece electromagnetic flowmeter
scale related technologies and protection measures of lightning protection information produced by excellent flow meter
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Electromagnetic flow meter used outdoors, sometimes need lightning-proof, now under the Shanghai beauty river small make up for everybody finishing lightning-proof technology and protective measures of electromagnetic flowmeter, in industrial production, the use of electrical equipment of the transient voltage.
More flow meter manufacturers choose model price quote you are welcome to inquire, here is a one-piece electromagnetic flowmeter scale related technologies and protection measures of lightning protection article details.
Electromagnetic flow meter used outdoors, sometimes need lightning-proof, now under the Shanghai beauty river small make up for everybody finishing lightning-proof technology and protective measures of electromagnetic flowmeter, in industrial production, the use of electrical equipment of the voltage transient and surge are everywhere, grid, lightning, demolition, even people walking on the carpet will produce tens of thousands of volts electrostatic induction voltage, these, are instrumentation one-piece electromagnetic flowmeter stealth deadly killer.
Instruments in use are often encountered unexpected voltage transient and surge, which can lead to damage of the electronic equipment, instrument and meter is the cause of damage of the semiconductor devices,
Including diodes, transistors, SCR and integrated circuit, etc. )
Have been burned or breakdown.
According to statistics, instrument and meter of failure is 75% caused by transient and surge.
Therefore, in order to improve the reliability of the instrument and the body's own security, must take the voltage transient and surge protection measures.
Just as test and measurement below small make up together to get to know the related content.
Electrostatic discharge (
And electrical transient bursts (
The harm of instrumentation system will produce different degrees.
Electrostatic discharge in 5 ~ 200 MHZ frequency range to produce strong radiofrequency radiation.
The radiation energy peak often appear in the 35 MHZ ~ 45 MHZ self-excited oscillation.
Many of the information transmission the resonant frequency of the cable is usually in this frequency range, as a result, cable and string into a large number of electrostatic discharge radiation energy.
Electrical transient bursts also generate a strong radiation emission, which coupled to the cable and casing line.
When the cable is exposed to 4 ~ 8 kv electrostatic discharge environment, information transmission cable terminal can be measured on the load induced voltage 600 v, the voltage is more than a typical digital instrument of threshold voltage value of 0.
4 v, the typical induction pulse duration is about 400 nanoseconds.
A lightning protection port according to the instrument, instruments and meters one-piece electromagnetic flowmeter application of engineering practice, instruments and meters by lightning strike can be roughly divided into direct lightning, transmission induction lightning and thunder.
But no matter in which kind of form to equipment can be summarized as from the following four parts of the invasion of lightning surge, in this call these parts lightning protection port, instrument and meter is given for illustration.
Port 1, shell, for example, we can make any big or small instrument shell or system as a whole, such as sensors, transmission lines, signal relay, field instrument, DCS system and so on, they are likely to completely exposed to the environment by direct lightning, cause equipment damage.
Standard regulation, when a device shell by 4 kv lightning electrostatic discharge, affect the normal operation of the instrument or system.
Such as sensors placed in outdoor terminal box may contact by lightning discharge;
Located within the room DCS cabinet could be building column discharge of the air discharge.
2, line port (
Including day feeder, data line, line, etc. )
In the control system, in order to realize one-piece electromagnetic flowmeter signal or information transfer is always have a connection with the outside world, such as the process control system and signal transition is the main distribution frame, data transmission network of terminals, microwave equipment to the antenna feeder and so on, then the receiving or transmitting signal from the outside world out of the interface is likely to be hit from the lightning surge.
Surge signal port came in from outside because buildings often by long cable, so use 10/700 & mu;
S waveform, the standard rules between line and line surge voltage is 0.
5 kv, wire to the ground between the surge voltage of 1 kv.
And transmit signals between the instrument and meter inside the building of the port of surge equivalent to hit the power line surge, use 1.
S combination wave, line to line and line to surge voltage limit is the same.
Once more than the limit, the signal after port and port equipment could be damaged.
3, power supply port power supply port is zui widely distributed also zui easy induction or conduction lightning wave area, from these power distribution box to the power outlet port can be in any position.
Standard in 1.
S wave rolled off the production line and the line between the surge voltage limit of 0.
5 kv, line to surge voltage limit to 1 kv.
But the surge voltage is indicated here working voltage is 220 v ac, if low working voltage is not based on this standard, the power cord is impacted by the smaller surge may not immediately on the damage to the equipment, but at least have an impact on life.
4, grounding port although not specifically mentioned in the standard port of indicators, the actual port information technology equipment is very important.
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