Application Notes
Surge Protection

Isolation / Temperature / Pulse / Strain Gauge / Potentiometer / AC
Pneumatic / Function / Power Supply / Alarm / Power Mesurement
Trend & Log/Communication / Surge Protection / Other Topics

030039 Is there a way to protect electronic instruments from a direct lightning strike?
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030040 A remote field transmitter connected to a local indicator which is protected by a lightning surge protector begins to show inconsistent display values. What could be the trouble?
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030041 A control room instrument was damaged during a recent lightning strike. What can be done to prevent this damage in the future?
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030042 A transmitter that is attached to a panel located indoors was damaged by a recent lightning strike. Can you explain why this occurred?
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030043 Is a lightning surge protector necessary for a power source line?
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030044 During a recent lightning storm, the power was turned off but some instruments were still damaged. Can you explain this?
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030045 An instrument was blackened by a lightning strike via a lightning rod. Is there a reason for this?
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030046 It has been said that if you use buried cables, then that is enough protection from lightning. Is this a true statement?
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030047 How much resistance is appropriate when grounding the M-RESTER?
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030048 Is an instrument safe if the lightning surge protector on the power supply line is damaged?
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030049 A field transmitter was connected to a lightning surge protector, but it was still damaged by a lightning strike. Can you tell me why?
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030050 After a lightning storm, there was no input from the remote RTD sensor to the temperature transmitter. There is no detectable damage to the transmitter. What could have happened?
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032010 Use a Watchdog for Troubled Spots
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032011 M-Rester Application in Waterworks
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032077 We are using universal input transmitter, M3LU with 4-wire RTD sensor.
We’d like to install lightning surge protector for this system. Does M-System have any lightning protector for 4-wire RTD sensor signal use?
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032105 We plan to install a surge protector on the relay output circuit from the
host PLC. The load of this relay output is an electromagnetic valve. We
have an experience that we installed M-System Surge Protector, model MDP-24-1
but available load current for the MDP-24-1 is up to 100 mA.
We are looking for a surge protector for the above usage with load current
0.5 A. Does M-System have a suitable one?
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032132 We are going to install 4 units of 2-wire pressure transmitters at field.
We plan to use single DC power supply for these multiple transmitters with parallel connection. We will install lightning surge protectors to protect each signal line. If one of the protectors fails as short circuit mode, it could cause power shutdown and stop supplying power not only to the failure loop but also to all other transmitters. We need to avoid this situation by any means. Does M-System have any solution?
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032143 In our factory, there are communication devices, which communicate each other via RS-485 full duplex cable. We’d like to install a surge protector for protecting the devices from lightning surge. We know M-System lightning surge protector, model MDP-4R but it is used for RS-485 half duplex cable.
Do we need to install 2 pieces of MDP-4R on the full duplex RS-485 line?
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032144 We make a temperature measurement of high precision with 4-wire RTD sensor.
Since we know M-System universal type transmitter, model M3LU is applicable to 4-wire RTD sensor, we use this model for the measurement. We also like to install a lightning surge protector but can not find a suitable one for 4-wire RTD.
I’m aware that M-System lightning surge protector, model MDP-RB is used for 3-wire RTD but can we protect 4-wire RTD line with multiple units of the MDP-RB?
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Isolation / Temperature / Pulse / Strain Gauge / Potentiometer / AC
Pneumatic / Function / Power Supply / Alarm / Power Mesurement
Trend & Log/Communication / Surge Protection / Other Topics
 
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