The TS293EA consists of a two-wire 4÷20mA linear transmitter able to detect Ammonia (NH3). The Ammonia (NH3) is a colourless gas with a very sharp smell. A concentration of 50÷100 ppm causes irritation of the respiratory system; beyond a concentration of 100ppm it causes eyes irritation. At 5,000 ppm the Ammonia is lethal.