EMC Testing for Medical Device with Solenoid Valves

J

jayanthi

#1
Hi all,
We are planning to do EMC testing IEC60601-1-2 for one of our Medical device, Dialyser cleaning system. This system has lot of solenoid valves which will open & close during cleaning process.
in this regard, i have following doubts
1. Is there any specific test for these devices?
2. Is there any shielding / precaution we need to adopt for solenoid valves for EMC testing.


Thanks in advance,
Jaya
 
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Peter Selvey

Staff member
Super Moderator
#3
For immunity side of EMC, nothing special is expected for the solenoid valve itself.

For emissions, it is possible that when the relay contact opens, transient RF noise can be created, especially for larger inductive loads. This is usually controlled by using a snubber circuit (e.g. RC) around around the switch contacts.

See http://www.emcuk.co.uk/awareness/Pages/MitigationTechniques/Design/SuppressArcSpark.htm

for an example.
 
J

jayanthi

#4
Thanks Peter & Stijloor;
We already have snubber circuit across each solenoid .Hopefully we have better shielding.
Regards
jaya
 
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