ALTANA Ford Viscosity Cups - Manual (Page 6)

7
Recalibration
Recalibration:
The Ford Cups are milled from solid aluminum
bar stock and are fitted with a stainless steel
orifice. Each cup is tested with a viscous fluid
referenced to National Bureau of
Standards certified oils. The orifice is honed to
insure that the assembly complies to the
applicable „time viscosity“ flow formula. If the
orifice of the cup becomes damaged or
worn and the original calibration is questioned,
the cup should be returned to BYK-Gardner,
to be checked, fitted with a new orifice (if
necessary) and recalibrated.