Centrifuge Calibration using Photo Tachometer - SOP Needed

M

Mohammed Gouda

#1
Dear Sirs,

Please i need to help me about you try to found to me the SOP for the
calibration of the Centrifuge using photo tachometer, but please must be based on the international reference.

Thanks.

Best Regards,
 
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Hershal

Metrologist-Auditor
Staff member
Super Moderator
#2
Folks may not be able to post specific procedures here regarding this, but those who are more knowledgable should reply shortly.
 

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#3
This may end up being such a specialized type of calibration that few, if any, visitors here will be able to help with. I would expect the manufacturer of the centrifuge to have some type of recommended procedure.
 

BradM

Staff member
Admin
#4
Hello Mohammed!

As far as an international standard, I am unaware of such an item. Most procedures I have seen for a centrifuge are home grown, and are based on specific mfg. specifications.

There are many different centrifuges; notably ones with a speed display, and ones without a speed display. There is typically a temperature indicator which may need to be verified also.

Most of the time what I have seen is 1 of 2 test setups. First, a disc or a fixture is attached to the main spindle with a piece of reflective tape on it. Usually, you will probably want to use clear tape to hold the reflective tape, due to the high speeds sometimes throwing the reflective tape off. Second, you can find a place on the shaft and attach the piece of reflective tape (again, with clear tape on top of that). Then using a hand-held tachometer, one can measure the RPM of the centrifuge. That reading is then compared to the display, or the mfg. specification for the speed is verified (within appropriate tolerance range).

The temperature could then fall into removing the sensor and placing into an appropriate test environment, or placing a standard probe next to the centrifuge temperature probe and compare.

This is fairly general for calibration. The instruction manual for the centrifuge is really your best bet. Along with calibration, there are maintenance checks for the motors, gaskets, and other parts on the centrifuge.

Depending on the mfg., many have service manuals for the equipment you can purchase. They are not cheap, but may give you the help you need.:D

Hope that helps.:)
 
A

arios

#5
Hi Brad

Let me please take advange of your experience for a question I have had for a long time with regards to testing using tachometers, and sorry for asking if this question has an obvious answer, but at least it does not for me yet:

How can we deal with the harmonics? I mean, Wouldn't a shaft rotating at 60 r.p.m. appear the same as another one at 120 r.p.m. when testing with a tachometer? This assuming that we are targeting for finding 60 r.p.m.

Please provide me with some clarification when you have an opportunity. This may be a useful consideration for a calibration SOP as well

Gracias! Thanks!
Alberto
 

BradM

Staff member
Admin
#6
Hi Brad

Let me please take advange of your experience for a question I have had for a long time with regards to testing using tachometers, and sorry for asking if this question has an obvious answer, but at least it does not for me yet:

How can we deal with the harmonics? I mean, Wouldn't a shaft rotating at 60 r.p.m. appear the same as another one at 120 r.p.m. when testing with a tachometer? This assuming that we are targeting for finding 60 r.p.m.

Please provide me with some clarification when you have an opportunity. This may be a useful consideration for a calibration SOP as well

Gracias! Thanks!
Alberto
Hello, Alberto! :bigwave:I'm not sure what you mean. I have never observed any such problems. It does take a while to get the initial setup working correctly; getting the tape in the right place and such. On some applications, I would put black tape on first, then the reflective tape.
 
A

arios

#7
Thanks Brad

What I meant with the question is how to differentiate a rotating speed that is a multiple of the other. That is what I call harmonics. Using a tachometer I will se a "white" spot on the same point regardless if it is rotating at 120 or 60 r.p.m.. How can we tell which is which

I hope this helps. See'ya!
Alberto
 

BradM

Staff member
Admin
#8
Thanks Brad

What I meant with the question is how to differentiate a rotating speed that is a multiple of the other. That is what I call harmonics. Using a tachometer I will se a "white" spot on the same point regardless if it is rotating at 120 or 60 r.p.m.. How can we tell which is which

I hope this helps. See'ya!
Alberto
I think I know what you're talking about. There is some inconsistency in the approach. Typically, it may take a little bit to stabilize to the correct reading.
 
A

alexandrunelu

#9
Hi Brad

Let me please take advange of your experience for a question I have had for a long time with regards to testing using tachometers, and sorry for asking if this question has an obvious answer, but at least it does not for me yet:

How can we deal with the harmonics? I mean, Wouldn't a shaft rotating at 60 r.p.m. appear the same as another one at 120 r.p.m. when testing with a tachometer? This assuming that we are targeting for finding 60 r.p.m.

Please provide me with some clarification when you have an opportunity. This may be a useful consideration for a calibration SOP as well

Gracias! Thanks!
Alberto
Hello, I've noticed that if you have, for example, a spinning object at 60 rpm and you have set the stroboscope at 120 rpm, in case you can observe the whole area of the spining object you will see a double image of the mark (initial mark made on the spinning object for better observation), if you increase the flash frequency at 180 you will see 3 images of the mark and soo on. as a conclusion for an adequate measuring you have to see an unique stand still image of the mark
 
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