The nanotechnology enabled and patented TTI R-series sensor for H2S is a 3-electrode system with pin connections (for working, reference, and counter electrodes). While the standard configuration provide compatibility with the industry-standard ‘7-Series’ package, the pin configuration can be customized to match virtually any customer specification. These cost effective sensors are based on a design that has been proven for over 10 years in the field and have the highest reliability of any electrochemical sensor.