Minimum H2 for NH3 Display Parameter

 

This analyzer measures %H2 (in ppm) and calculates a gas composition of DA or NH3 (with %DA + %NH3 = 100%). An available analog output provides a 4-20 mA signal representing either DA or NH3--defaulting to 4 mA when zero hydrogen is measured.

 

Due to the high accuracy of the sensor, trace amounts of Hydrogen may be measured in "near zero" environments, resulting in oscillations between 4- and 20 mA when configured for %NH3. To prevent such oscillations the user may define a Minimum H2 to fix the output at 4 mA until the measured Hydrogen percentage exceeds such a threshold.