Abstract: A system and method are provided for determining sensor contact in a multi-sensor device. The method measures a series of photoplethysmography (PPG) heart beat signals, while simultaneously measuring a series of electrocardiogram (ECG) heart beat signals. The method detects a correlation in time between each of a plurality of PPG signals and corresponding ECG signals. In response to the timing between correlated PPG and ECG signals remaining within a first correlation deviation limit, a correlation state is determined. For example, a correlation state may be determined in response to n out of m number of correlated PPG and ECG signals remaining within the correlation deviation limit, where n and m are integers greater than zero.