DEVICE FOR MONITORING CONTENT OF AMMONIA TRACE IMPURITIES IN AIR Russian patent published in 2025 - IPC G01N27/68 

FIELD: measuring.

SUBSTANCE: invention relates to environmental protection, in particular to air pollution control, and can be used to detect trace impurities of ammonia in the air of production facilities, in closed process systems, as well as to control permeability of materials and tightness of articles. Device for monitoring content of ammonia trace elements in air comprises an air duct in which an aerosol filter is installed in series, a direct current corona discharge chamber containing external and internal electrodes of a direct current corona discharge chamber, a flow reaction chamber, AC corona discharge chamber comprising external and internal electrodes of the AC corona discharge chamber, an induction measuring electrode and a gas flow rate agitator, as well as a constant high voltage source connected to the external and internal electrodes of the DC corona discharge chamber, high-voltage AC source connected to external and internal electrodes of the AC corona discharge chamber, a charge-sensitive amplifier, the input of which is electrically connected to the induction measuring electrode, and an ammonia concentration indicator. Section of the air duct between the aerosol filter and the DC corona discharge chamber is equipped with an additional gas channel containing a filter with an ammonia absorber, as well as a three-way valve installed in the air duct after the aerosol filter at the inlet to the additional gas channel, at that, the DC corona discharge chamber is arranged without a gap relative to the air duct, and the three-way valve is mechanically connected to the displacement drive, the control input of which is connected to the output of the pulse generator, the input of which is the start-up input of the device, output of the pulse generator is also connected to the input of the delay line, the output of which is connected to the control input of the switch, the signal input of which is connected to the output of the charge-sensitive amplifier, wherein the first output of the switch is connected to the input of the first memory amplifier, the output of which is connected to the first input of the subtractor, wherein the second output of the switch is connected to the input of the second memory amplifier, the output of which is connected to the second input of the subtractor, the output of which is connected to the ammonia concentration indicator.

EFFECT: high reliability of detecting trace impurities of ammonia in air while maintaining high-speed operation.

1 cl, 1 dwg