Patent ID: 7832990
Filing Date: 2010-11-16
Classification: F04B

Abstract:
1. A method for determining the angular position of a pump shaft relative to a pump body, the method comprising: providing the pump shaft with a first locating feature, providing the pump shaft with a second locating feature, providing a measurement device provided with a measurement member, wherein the measurement device is mounted on the pump body and does not use electricity to indicate the measurement, engaging the measurement member with the first locating feature and determining a first distance between the first locating feature and a reference feature provided on the measurement device, wherein engaging the measurement member with the first locating feature prevents rotation of the pump shaft, engaging the measurement member with the second locating feature and determining a second distance between the second locating feature and a reference feature provided on the measurement device, wherein engaging the measurement member with the second locating feature prevents rotation of the pump shaft, determining the difference between the first and second distances to provide an indication of the angular position of the pump shaft relative to the pump body.