Atmospheric nitric acid online analyzer

NegotiableUpdate on 05/07

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

The HONO2-WLPAP atmospheric nitric acid online analyzer uses cadmium reduction method to reduce nitrate ions to nitrite ions. The entire process quality control is set up to achieve full process quality control from HONO absorption to calibration.

Product Details

The measurement of nitric acid concentration in the atmosphere is carried out using wet chemistry method. Adopting dual channels, one channel collects HONO and interfering substances, while the other channel collects HONO+interfering substances+HNO3. The atmospheric nitric acid online analyzer uses cadmium reduction method to reduce nitrate ions to nitrite ions. The nitrite obtained from the two routes reacts with sulfonamide to form a diazonium salt solution, which is then mixed with a dye solution of naphthylethylenediamine hydrochloride to form an azo dye. Azo dyes pass through a long path absorption tube to obtain the concentration of nitric acid by measuring the absorbance of specific wavelengths of light.

　　1、 Technical parameters:

1. Range: 5 ppt2 ppm (expandable);

2. Detection limit: better than 2 ppt;

3. Calibration method: offline calibration: easily calibrated using nitrous acid standards;

4. Standard gas calibration system: equipped with HONO standard gas automatic generation system, using HONO standard gas for online calibration of measuring instruments.

　　IIAtmospheric nitric acid online analyzerFeatures:

1. The classic wet chemistry method has a lower detection rate compared to optical methods, reaching up to 2ppt;

2. Dual channel measurement (dual fiber pools and dual spectrometers for two-way measurement), one measuring the total sum of HONO and interfering substances, and the other measuring interfering substances to ensure the accuracy and stability of the measurement results;

3. Full process quality control setting, which can achieve full process quality control from HONO absorption to calibration;

4. Adopting neutral non corrosive solution absorption: Currently, most LOPAP equipment uses a mixture of sulfonamide and hydrochloric acid as the absorption solution, with a pH of around 0, which causes significant damage to the vacuum pump during gas-liquid mixing. In addition, the high acidity of the waste liquid makes it difficult to handle and has an impact on the environment;

5. Automatic degassing system: Effectively removing bubbles in the pipeline is an important factor in the normal operation of the instrument, avoiding interference from bubbles and ensuring the effectiveness of real-time concentration output of the instrument. At present, LOPAP generally does not have a device for removing bubbles, which can be affected by bubbles;

6. Real time concentration output (advantage of calibration system): Currently, there are few LOPAPs on the market that can directly output concentration. Generally, they output the ratio or log value of the reference wavelength to the absorption wavelength intensity, without further processing of the data. In the software, we only need to output the zero point and corresponding slope value to conveniently output the corresponding concentration value in real-time;

7. Touch screen control: The gas flow rate, peristaltic pump speed, and light source intensity can be set in real-time using the touch screen. By adjusting the gas-liquid flow rate, the measurement concentration range can be easily adjusted;

8. Liquid level alarm protection system: Add a liquid level alarm system to prevent liquid from being sucked into the flow controller (MFC), vacuum pump, etc., in order to avoid damage to the corresponding components;

9. Timed zero calibration: Through the touch screen, the time and interval for zero calibration can be set, which can effectively check the stability of the instrument and whether the real-time concentration obtained is accurate.

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