Thermoelectrically-Cooled Cold-Cranking Simulators measure the apparent viscosity of oils at temperatures from �35�C to �5�C within a viscosity range of 1500 mPa�s to 27,000 mPa�s. In the lubricants industry the apparent viscosity determined by the CCS is generally called the �cranking viscosity� of an oil.

As described in ASTM D5293, Cold-Cranking Simulators are used to determine whether an engine oil�s apparent viscosity meets the CCS specification criteria described in SAE J300 for cranking viscosity. Two models of the Cannon Thermoelectrically-Cooled Cold-Cranking Simulator are available: the completely-automatic CCS-2100 and the semi-automatic CCS-2050. Both instruments perform the same computer-controlled tests, but the CCS-2050 requires the presence of an operator, while the CCS-2100 runs unattended.

Both models have built-in solid-state thermoelectric cooling, eliminating the need for a low-temperature refrigeration unit. This offers several advantages. No methanol coolant or other flammable liquid is required and improved temperature management of the rotor/stator eliminates the thermal lag seen when the rotor/stator is cooled by a circulating liquid. In addition, a thermoelectric sample warming cycle greatly improves the sample flushing process.

The main difference between the old and new models of the CCS is that built-in thermoelectric cooling takes the place of low-temperature external refrigeration. One of the many advantages of thermoelectric cooling is that it allows improved temperature management of the stator, eliminating the need for batching sample temperatures.