YYT200 portable toxic volatile gas analyzer

Technical features:

1YYT200 portable toxic volatile gas analyzerAdopting a multi detector design, with standard FID detector and optional PID detector and oxygen sensor, it responds to almost all volatile organic gases and some inorganic gases that cause foul odors.

2. The response time of the analyzer is less than 3.5 seconds, suitable for on-site screening of volatile organic gas leaks and tracing of inorganic odor gases.

3. Compact structure, carefully selected lightweight composite components, with a host weight of approximately 4.5kg, making it easy to carry around.

4. The whole circuit of the analyzer adopts intrinsic safety explosion-proof design, and the core FID detector module adopts explosion-proof design.

5. The handheld device adopts explosion-proof design to meet the requirements for use in explosive gas hazardous areas.

6. The hydrogen cylinder has a large capacity and can meet the daily usage needs.

7. Handheld device scan code recognition calls for image-based point information, which is more efficient.

8. The analyzer adopts a constant current sampling design, with stable sampling flow and more accurate measurement data.

Execution standard:

Guidelines for the Investigation of VOCs Pollution Sources in the Petrochemical Industry (Environmental Protection Office [2015] No. 10)

Guidelines for Leak Detection and Repair in Petrochemical Enterprises (Environmental Protection Office [2015] No. 10)

Guidelines for On site Inspection of Volatile Organic Compounds in Key Industry Enterprises (Trial)

HJ 1230-2021 Technical Guidelines for Detection and Remediation of Volatile Organic Compound Leakage in Industrial Enterprises (to be implemented in April 2022)

GB 37822-2019 Unorganized Emission Control Standards for Volatile Organic Compounds

HJ 733-2014 Technical Guidelines for Detection of Volatile Organic Compounds in Leakage and Open Liquid Surface Emissions

YYT200 portable toxic volatile gas analyzerWorking Principle:

1. Flame ionization detector (FID)

The working principle of FID is based on the combustion of hydrogen gas in the air as the energy source. The carrier gas carries the measured component and combustible gas (H2) into the detector from the nozzle, and the auxiliary gas (air) is introduced from the surroundings. The measured component is dissociated into positive and negative ions in the flame. In the electric field formed by the polarization voltage, the positive and negative ions move towards their respective opposite electrodes, and the resulting ion flow is collected and output by the collection electrode. After impedance conversion, the amplifier can obtain a measurable electrical signal. The FID structure of ZR-3130 is shown in Figure 1:

Normally, to ensure stable combustion of FID flames, the sample gas needs to contain no less than 16% oxygen. The dilution device increases the oxygen content of the dilution gas by adding oxygen rich hydrocarbon removal air (usually around 21% oxygen content) to ensure the quality of the flame. It is recommended to use dynamically calibrated diluted standard gas (diluted gas is hydrocarbon free air) for concentration calibration to obtain the best calibration environment.

2. Photoionization detector (PID)

The photoionization detector (PID) consists of a vacuum ultraviolet lamp and an ionization chamber. Its working principle is that the gas to be measured absorbs photons emitted by the ultraviolet lamp that are higher than the ionization energy of gas molecules, and is ionized into positive and negative ions. Under the action of an external electric field, the ions shift to form a weak current. Due to the linear relationship between the concentration of the tested gas and the photoionization current, the concentration of the tested gas can be determined by measuring the current value, thereby determining whether the tested gas exceeds the standard. Its structure is shown in Figure 2:

Although PID detectors are limited by their small dynamic range and are only suitable for measuring high concentration gases, PID is also more susceptible to interference from water vapor than FID. However, in the testing of inorganic components with no response and components with low response in certain FIDs, PID can effectively compensate for the lack of FID testing capability. And because PID detection does not require oxygen and hydrogen, PID is the preferred detector in certain extreme environments such as flammable, explosive, and low oxygen environments.

Working conditions:

Working power supply: AC (220 ± 22) V, (50 ± 1) Hz

Environmental temperature and humidity: (-10~+45) ℃, （15 ～ 95）%RH

Atmospheric pressure: (86-106) kPa

Applicable environment: Host Ex d ia IIC T4 Gb (intrinsic safety explosion-proof type), Handheld device Ex ib Ⅱ CT5 Gb/ExibD 21 T95 ℃ explosion-proof occasion

The power grounding wire should be well grounded

When working in the field, measures should be taken to prevent rain, snow, dust, and exposure to sunlight

Technical parameters: