Thermo Scientific 17i Ammonia (NH3) Analyzer

17i measures ammonia (NH3) in ambient air by the chemiluminescence method. It works in three modes: in NO mode, the sample mixes with ozone and the light intensity gives the NO concentration; in NOx mode, a molybdenum converter reduces NO2 to NO; in Nt mode, a stainless steel converter converts both NO2 and NH3 to NO. Ammonia is obtained from the difference between total (Nt) and NOx.

• Measurement of NO and NO2 together with NH3.
• Detection limit 1.0 ppb (120-second average).
• Zero drift below 1 ppb; span drift ±1 percent of full scale.
• Automatic and manual modes, selectable time constant.
• i-Series: Ethernet, one-touch menu, large flash memory, more accessible internal layout.

Selectable voltage, RS232/RS485, TCP/IP, 10 status relays and a power failure indication are standard; isolated 0-20 or 4-20 mA and 8 analog inputs are optional.

Ammonia measurement matters at ambient locations such as agricultural areas, livestock facilities and SCR/SNCR NH3 slip monitoring points. Because the instrument gives NO, NO2 and total nitrogen signals from the same sample, no additional analyzer is required.

Tetra commissions 17i with rack mounting at the measurement station, sample line and converter checks. Multi-point calibration, converter efficiency testing and local spares for parts such as the ozone generator are part of the service.