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Zahn Cup Correction Chart - Boeing specification BSS 7234

F

Flaps40

#1
Helo guys, I've search related topics in Elsmar, but cannot find one, so i create the topic.

Last month our company received SER from Boeing's reps. Their finding was "No corrective chart for Zahn cup as per BSS 7234". Corrective chart is for convertion between Efflux time vs Zahn second.

Our external calibration company cannot provide the chart because they don't even know about Boeing spec BSS7234, and they only a general calibration company.

Our company uses Zahn cup no.2, so my query is, is anybody can share with me his/her corrective chart and the method to develop the chart. I know each individual zahn cup cannot be the same. I just wanna know the method to develop it.

Thanks.
 
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Stijloor

Staff member
Super Moderator
#2
Re: Zahn Cup Correction Chart

Helo guys, I've search related topics in Elsmar, but cannot find one, so i create the topic.

Last month our company received SER from Boeing's reps. Their finding was "No corrective chart for Zahn cup as per BSS 7234". Corrective chart is for convertion between Efflux time vs Zahn second.

Our external calibration company cannot provide the chart because they don't even know about Boeing spec BSS7234, and they only a general calibration company.

Our company uses Zahn cup no.2, so my query is, is anybody can share with me his/her corrective chart and the method to develop the chart. I know each individual zahn cup cannot be the same. I just wanna know the method to develop it.

Thanks.
I am not an expert in Zahn Cups, but could this article help?

How about this one?

Stijloor.
 
A

andygr

#3
You must be using a BMS material that requires a viscosity test to Boeing standards. Unfortunatly BSS7234 is Boeing Proprietary, Basic Controls in Accordance with PRO-2227 Required so it can not be posted here.
Sooo
You must get on the Boeing Portal and get a copy and look at it. It is only 4 pages and tells you how to create the required chart. You can flow it down to your calibration house and they can perform the calibration and supply the chart if they follw the BSS.
If you can not find/get the BS 7234 frpm the portal just ask your Boeing PQR for a copy.

:2cents:
 
F

Flaps40

#4
Yes, I am actually reading the BSS7234 right now... Thank God it explains everything. But in certain clauses, I can't understand... Never mind, I'll talk to Boeing reps later...
 
Last edited by a moderator:
S

sjudge65

#5
It's been a while since I calibrated a Zahn cup to the BSSS 7234.
If I recall correctly.
You calibrate with a neutonian fluid ( oil ) that has a flow time in the range that you are measuring viscosity.

So you may need to convert flow time expected to a centistoike viscosity based on the calculation in the 7234. This will identify the neutonian oil you need to purchase.
You can then measure the actual flow time of this oil through your cup.
If the actual value deviates from the calculated value you then determine the % error and apply this as a factor when using the cup in production.
Hope this helps
 
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