Detection principle of chemiluminescence nitrogen determination apparatus
Chemiluminescence nitrogen determination instrument (SH708) adopts the principle of chemiluminescence detection. After the nitrogen content sample (or standard sample) to be measured is introduced into the high-temperature cracking furnace, the sample is completely gasified and oxidized cracking occurs at a high temperature of about 1050℃, and the nitrogen compounds in it are quantitatively converted to nitric oxide (NO).
The reaction gas is carried by carrier gas, and the moisture in it is removed through the magnesium perchlorate dryer and enters the reaction chamber.
The metastable nitric oxide reacts with the O3 gas from the ozone generator in the reaction chamber and converts to the excited state of NO2.
When the excited NO2 transitions to the ground state, a photon is emitted, and the light signal is detected and received by a photomultiplier tube at a specific wavelength.
Then by the micro current amplifier amplification, computer data processing, can be converted into the light intensity proportional to the electrical signal.
Under certain conditions, the chemiluminescence intensity in the reaction is proportional to the amount of nitric oxide, and the amount of nitric oxide is in turn proportional to the total nitrogen content in the sample, so the total nitrogen content in the sample can be determined by measuring the chemiluminescence intensity.
Temperature control range: room temperature ~ 1050℃
Temperature control accuracy: ±3℃
Gas source requirements: high purity argon: purity above 99.995%
High purity oxygen: above 99.995% purity
Power source: AC220V±22V, 50Hz±0.5Hz, 1500W
Dimensions: Host: 305(W)×460(D)×440(H)mm
Temperature control: 550 (W) x 460 x 440 mm (H) (D)
Weight: host: 20kg
Temperature control: 40 kg
Complete set of equipment requirements: host (data acquisition, control system), cracking furnace, automatic sampler (gas, liquid), computer operating software, etc.
Other options: computer, solid sampler, gas sampler.