In many environments Solid-State sensors are an excellent choice because of high reliability, long life and low cost.  However, their broad-spectrum characteristics make them "application sensitive".  The non-linear output allows a sensitivity range from parts per million (ppm) to the percentage range. 

The new Semi-Conductor sensor raises the standard of solid-state technology to allow trip levels as low as 50 ppm ammonia in well ventilated engine rooms and outdoor applications.  

Electrochemical sensors give the highest degree of gas specific monitoring.  These have excellent zero and calibration stability over long periods of time.  Electrochemical sensors eliminate false trips even in the most hostile environments.

Infrared sensors offer the sophistication of highly specific analyzers in a simple rugged design without pumps, filters or moving parts.  These sensors are selective, stable and durable over many years and provide long-term maintenance free operation.