Signal 4th Generation QUASAR Nitrogen Oxide Analysis System-Fornitore globale

13th Floor, Building E, Chang'an Center, Financial Street, No. 26 Chengtong Street, Shijingshan District, Beijing

Application scenarios: NOx measurement in engine exhaust, combustion research, process plants, CEMS and medical gas production processes

Description:

The 4th generation QUASAR nitrogen oxide analysis system from Signal in the UK uses the principle of chemiluminescence to analyze NOx, and has many unique advantages such as high performance and easy operation. The heating vacuum chemiluminescence method is a reference method for monitoring NOx (a mixture of NO and NO2). The chemiluminescence method under vacuum has higher sensitivity and lower quenching effect. The heated reaction chamber can handle wet and hot sample gases without condensation. Under vacuum conditions, the chemiluminescence reaction between NO and O3 is more intense, with a higher signal-to-noise ratio and less quenching of CO2 and H2O. The continuous monitoring and rapid response characteristics of this method are very suitable for working conditions that require real-time data. This monitoring method is listed in many standards, such as EN 14792 and Method 7E.

In order to obtain accurate measurements from engine or combustion gas emissions, it is important to measure the NOx content in the entire exhaust. This means that the exhaust gas must be transported to the analyzer through a heating pipeline. The inlet of the analyzer must also be heated, and sufficient dust filtration must be carried out in the heating area. The sample gas entering and inside the reaction chamber must be kept in a vacuum state. Vacuum can prevent water condensation (without the need for dehydration), thereby preventing NO2 from dissolving in water. Vacuum also greatly improves the signal-to-noise ratio. In addition, the quenching effect generated by high concentrations of CO2 and H2O in vacuum is almost zero. Therefore, vacuum analyzers have become the preferred instrument for measuring NOx.

Another important feature of the 4th generation QUASAR nitrogen oxide analysis system is the unique design of the ozone generator. This instrument uses high-voltage neon tubes, which are different from simple corona discharge ozone generators or ultraviolet lamps. Neon tubes do not generate NO from N2 in the raw gas. If N2 is oxidized to NO and dissolved in water to form nitric acid, it will cause corrosion and nonlinearity. Some other manufacturers of chemiluminescence NOx analyzers require the use of pure oxygen to avoid these effects. The NO2 to NO converter inside the analyzer can add the value of NO2 to the NO reading to obtain the value of NOx. The NO2 reading is obtained by subtracting NO from NOx.

The 4th generation QUASAR nitrogen oxide analysis system uses carbon materials for this conversion. The carbon material is placed in a quartz container, so stainless steel will not undergo any other reactions at a high temperature of 400 ℃. Carbon materials need to be filled every two years. To ensure the reliability of performance, Signal manufacturer uses corrosion-resistant vacuum pumps. Before the vacuum pump, the catalyst inside the analyzer has already destroyed ozone. For conditions where CO2 and H2O are not considered and the sample gas is at approximately room temperature, Signal manufacturer has a moderately heated chemiluminescence analyzer without a vacuum pump. Typical operating conditions include measuring trace amounts of NOx in the process gas, measuring vehicle exhaust diluted by the CVS system, and RDE onboard testing (optional 24VDC version). This analyzer can also be used in CEMS (Continuous Emission Monitoring) applications, but in order to maximize maintenance intervals, the flue gas needs to be cleaned and dried before using the analyzer.

Product features:

Dry high vacuum pump or atmospheric version

Hot and cold versions

Optional color touch screen with data recording function

Fully automatic operation

Remote operable Windows or VB software

Dual detectors, capable of detecting NO2, NO, and NOx

Continuous output, trace PPM measurement standard

Optional high range%

Types of detectable gases: NOx、NO、NO₂、 NH₃

Multiple alarm mode settings:

1. Concentration limit (user set)

2. Sample gas flow rate (outside limits)

3. Sampling pump malfunction

4. Heating chamber malfunction

5. Voltage outside limits

6. Thermocouple malfunction

7. EHT outside limits

8. Setting error

9. Option error

10. Calibration failed (no calibration settings)

Application conditions: CEMS、 Scientific research Compliance、Gas Purity、 The automotive industry, air quality Process、 burning

Technical parameters:

Measurement unit: PPM or mg/m3, customers can freely choose

Range A: 0-1000ppm.

Range B: 0-10000ppm.

Range C: 0-100000 ppm

Response time: For instruments with vacuum pumps, T90 is 1 second

Instrument without vacuum pump, T90 is 2 seconds

The temperature impact on the standard gas:< 0.3% per℃

Sample gas inlet pressure: There are sampling pump options ranging from -0.5 bar to+0.5 bar

No sampling pump option, maximum+0.5 bar

Zero point noise: 0.01 ppm for instruments with vacuum pumps

Instrument without vacuum pump 0.1 ppm

Sample gas filter: detachable 0.4 micron PTFE

CFID non removable stainless steel filter 7um

Display screen: no screen or tablet or 7-inch color screen

Sampling conditions: 150 ℃

Vacuum version: Non heated version, room temperature is sufficient

Environmental temperature: 5-40 ℃

Ozone air consumption: The vacuum analyzer extracts ozone gas from the atmosphere as raw material gas.

A non vacuum analyzer requires 500mL/min of dry air.

Output: 0-10 Vdc RS232、 Ethernet, TCP/IP optional 4-20 mA

Power supply: 220-240 V AC, 110-120 V AC, 24 V DC, maximum 600 W

Remote control: via RS232 port AK protocol, Ethernet, with S4i remote software operating system included

Size and weight: 19 "(w) x 133.5 (h) x 530 mm (d) approximately 30kg