What are the commercially available reliable NH3 sensors in the market?

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V. B. Zaytsev

Dear Venika Ekanayake! In addition to previous answer you may take a look at the newt pages:

https://www.mixsensors.com/Toxic_gas_sensor/MIX8415_Electrochemical_Ammonia_Gas_Sensor_44.html?google-network=g-campaignid=12015491038-adgroupid=115694725653-target=kwd-24373640-creative=490139243759-device=c-placement=-keyword=ammonia%20sensor&gclid=Cj0KCQjwvYSEBhDjARIsAJMn0lhyI4DRednbv2DOHAV3gzCaxex8cxRHrbHmcLPmOW7AmC1AFxJnm0QaAn8yEALw_wcB

https://pdf.directindustry.com/pdf/delphi-power-train/delphi-ammonia-sensor/54988-615382.html

http://jxctet.com/pro/0_0_0_62/?gclid=Cj0KCQjwvYSEBhDjARIsAJMn0lhwzgT3vfe598PCWAF4bq6dT2BXg3-dIw7xLLgpdepHRiriCVA7QsoaAr2MEALw_wcB

Soad Mohialdin

Sensitive and Selective NH3 Monitoring at Room Temperature Using ZnO Ceramic Nanofibers Decorated with Poly(styrene sulfonate)

David Degler

As far as I know, Dräger offers electrochemical, i.e. selective, NH3 sensors.