Cambridge Viscometers
General Motors' Electro Motive Division uses Cambridge viscometers on their latest H-series 6000 horsepower engines to monitor fuel dilution and other characteristics of their lube oil real time. In addition to GM, Ferrari, Lubrizol, Equilon, Tecumseh, the US Navy, US Army and a number of others have found Cambridge viscometers ideal for monitoring lubrication and hydraulic oils to monitor oil health and predict failures. Cambridge viscometers are fundamentally simple, rugged, accurate and repeatable despite operating environments with significant vibration. A key to the company’s technology is its use of a single, non-contact moving part both to clean and measure. The motion of the piston is controlled so that it monitors the fluid viscosity and keeps the sensor’s measurement chamber clean, so that the sensor requires minimum operator attention. A temperature detector is also included in the measurement chamber so that both temperature and viscosity are known for every measurement. The company’s patented self-cleaning characteristic enables the Cambridge sensors to operate trouble-free in-line and on-engine.
Exhibit 2: A schematic of a Cambridge sensor operating in-line
Cambridge Viscosity, Inc. viscometers use proprietary circuitry to analyze the piston’s travel time to measure absolute viscosity and monitor temperature. With all wetted parts stainless steel, the constant motion of the piston keeps the measurement sample fresh while mechanically scrubbing the measurement chamber. Cambridge has more than 7,000 sensors installed worldwide in many applications where viscosity knowledge and management is critical. A schematic of the operating characteristics of a typical Cambridge viscometer sensor is shown in Exhibit 2.
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