Medical Equipment Low Voltage Air Pumps

R

raymond02302

#1
Hello every fellows,
There are Low voltage(DC Voltage) powered air pumps in some medical equipments for its function (such as NIBP measurement etc.). It is commonly used in secondary circuit, the only hazard it maybe causes is heat and temperature. So, we can do the temperature test in normal condition and SFC( block pump ventilation hole).
Is analysis right ?
There is no temperature limit in the manufacturer 's sepecifiction or in the standard(IEC 60601-1), therefore, how can we determine the result for the test?
Or, we can do nothing for it just regarding the air pump not critical component

Any fellow has idea for it ?

thanks in advance.
 
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Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#3
Re: What should be concerned about Low Voltage Air Pump

Another quick "Bump". My Thanks in advance to anyone who can help with this one.
 

Peter Selvey

Staff member
Super Moderator
#4
Re: What should be concerned about Low Voltage Air Pump

From a normal condition (NC) point of view it is common that test labs attempt to measure the temperature of secondary motors by simply placing a thermocouple on the outer case. But, this is somewhat useless as the case temperature is not reflective of the winding temperature, and to measure the winding temperature would would be very difficult.

The focus on windings is a hangover from primary (mains) circuit testing: primary windings often work directly off the mains supply which is unregulated, and to limit weight (core material) they are often run close to the temperature limits at the extremes of supply voltage. Plus they usually contain safety related insulation (pri/sec; mains/earth). Thus every winding needs to be closely checked.

Secondary components operate off regulated circuits and are usually low power. They rarely run close to temperature limits. And, they don't contain safety insulation. So, an air pump used within it's ratings (voltage, pressure etc), would have no justification for checking the winding temperature under normal condition.

For secondary motors under single fault condition (SFC), the key point is fire. For this the standard (3rd edition) gives three effective options:

1) confirm < 15W or 900J avaliable in NC/SFC
2) confirm PCBs, wiring, connectors are flame proof, or
3) do SFC tests (i.e. locked rotor)

Use the option that is the easiest. If it is a simple DC motor, it may be possible to measure the resistance of the winding and use V-squared-R to confirm that 15W is simply not possible. Example: 12V motor, 10 ohm winding = 14.4W, no further action required.

And, it is normal that PCBs, wiring and connectors are flame proof anyway. If so, no further action.

Finally, many dc motor such as fans are easy to lock, and control circuits include overcurrent and locked rotor detection. So, it may be just a quick test.

For a air pump this may be difficult to access the "rotor" (or moving part). Just blocking the outlet is not locking the moving part. So, it is most likely to use (1) or (2).
 
R

raymond02302

#5
Re: What should be concerned about Low Voltage Air Pump

Thanks for peter selvey's suggestion and interpretation.
one question i have faced is that the power of air pump is more than 15 W. On your stand of point, the only way to evaluate the pump is locking the rotor, should i think of it? but doing this is very diffcult.

Thanks and best regards
 

Peter Selvey

Staff member
Super Moderator
#6
There is still the option (2) above to confirm that PCBs, wiring, connectors and nearby enclosures meet the requirements in 11.3 (e.g. are FV-2 + other fire enclosure requirements).

If Clause 11.3 is met, and there is no safety insulation involved, there is no need to perform fault tests.

But, since the pumps are low cost, it may also be an option to pull one apart and lock the moving parts. Air pumps sometimes don't have rotors, just a kind of solenoid part that moves back and forth.
 
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