12-volt version (first-generation SNS)
24-volt version (second-generation SNS)
Using zirconia (ZrO2) thick film technology, NGK has developed NOx sensors capable of measuring NOx density in motor vehicle exhaust gas. Attached directly to vehicle exhaust pipes, these NOx sensors allow precise measurements of NOx concentration in exhaust gas for extended periods.
NGK is bringing these NOx sensors to market as smart NOx sensors (SNSs) integrated with sensor control units capable of operating independently of engine control units (ECUs).
12-volt version (second-generation SNS)
In measurements of diesel engine exhaust gas, these sensors exhibit linear properties closely matching those of chemical luminescence detector (CLD) NOx analyzers.
NOx sensors have been developed and commercialized by NGK and its cooperation partner Continental which is making the final sensor module including sensor and electronics.