Calibrating a zahn cup

After using a plastic Zahn cup for a while, I suspect that a small amount of residue in the outlet hole will change the timing on the cup. Does anybody know how long it takes for clear water to empty from a new one of the popular plastic cups?
Len
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On 5/4/2014 1:20 PM, Len wrote:

Technical Data Cup Number     Seconds Range    Centistoke Range     Midrange Sensitivity¹     Calibration Oil Number² 1    40 to 60    10 to 36    1.3    G-10/19 2    20 to 60    19 to 156    3.3     G-60/117 3    12 to 60    64 to 596    10.5    G-200/458 4    10 to 60    79 to 784    13.9    G-200/458 5    10 to 60    161 to 1401    24.2    G-350/878 ¹ Stated as centistokes per second of efflux time. ² Centistoke values are nominal - actual values printed on labels
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Jeff

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