• Confirm need gas analyzer continuous 24Hour*7 Days monitoring; measure one sampling point or inspect multiple sampling points, we can recommend you to use online or portable gas analyzer.
• The concentration range of the measured gas and other background gases.
• Other special function requirements, such as: output 4-20mA, RS485,RS232, or whether to use a printer or an industrial computer for data conversion, etc.
• We will provide an on-site working condition table to understand measured gas, moisture, dust, tar, temperature, pressure, etc.

According to the technical principle, the commonly used is NDIR gas analyzer, UV-DOAS gas analyzer, TDLAS gas analyzer ,GC-FID gas analyzer,FTIR gas analyzer. The same gas can be measured by many different technologies. We can choose the appropriate gas analyzer for customers according to each customer applications.

such as H2S gas

• Due to the high analytical sensitivity of the lead acetate paper strip colorimetric method, the hydrogen sulfide content can be detected at 10×10. This type of instrument is mainly used for the monitoring of trace H2S, and the measurement range is narrow. When detecting samples with H2S content greater than 50umol/mol, the instrument needs to add a dilution system, resulting in dilution measurement errors. In addition, the lead acetate paper tape is a consumable product, which needs to be replaced frequently, and the operating cost is relatively high.
• The ultraviolet absorption method adopts the characteristic spectral absorption principle of SO2, H2S and other gases in the ultraviolet spectral region, with high detection sensitivity and accuracy and wide measurement range. There is almost no moisture interference in the measurement of SO2, H2S and other gases by ultraviolet absorption method, which is suitable for online detection of sulfide with high humidity in the measured gas.
• The laser optical method uses the tunable diode laser absorption spectroscopy (TDLAS) measurement technology, which is commonly used for H2S monitoring in natural gas. The working wavelength of H2S measured by laser spectroscopy is 1577nm in the near-infrared region, and the lower detection limit can reach 5umol/mol per optical path, but it is easily interfered by gases such as CH4 and CO2, and the price of mid-infrared gas analyzers is high.
• On-line gas chromatography Process gas chromatography can be equipped with various chromatographic detectors according to monitoring needs, so as to be suitable for on-line monitoring of different gases. It has the characteristics of many measurement components, wide measurement range, low detection limit and good repeatability. Thermal conductivity detectors (TCD) are mostly used for constant hydrogen sulfide gas detection, and flame photometric detectors (FPD) are mostly used for trace hydrogen sulfide gas detection.
• The electrochemical sensor method is widely used in the detection and alarm of toxic and harmful gases. Electrochemical sensors are dedicated to the detection of SO2, H2S and other sulfur-containing gases. Although the measurement accuracy is not high, the price is low and easy to use. Most of them are used for portable SO2, H2S and other gas detectors, as well as for poisonous and harmful gases. Fixed detection and alarm system.

Delivery method and cycle of gas analysis equipment?

At present, the gases we can measure include: SO2, NO, NO2, CO, CO2, O2, H2, CH4, C2H6, C3H8, H2S, HCL, HF, NH3, CL2 from ppb ,ppm to % range.

• After the gas analyzer used some period, it needs do zeroing .After each time measurement, we should check whether the gas analyzer is back to zeroing or not , we can inlet high purity N2 backflush, And block the air inlet and outlet to ensure the accuracy of the testing data
• Regular calibration can keep the instrument with good detection accuracy. Firstly, the instrument is calibrated with zeroing point gas and standard concentration gas, and the standard curve is obtained and stored in the gas analyzer. During measurement, the instrument compares the electrical signal generated by the gas concentration to be measured with the electrical signal of the standard concentration, and calculates the accurate gas concentration value.
• Do not exceed the measurement concentration range. It can accurately measure the gas concentration value, but if the high-concentration gas beyond the measurement range is measured for a long time, it may cause damage to the gas sensor, affecting gas analyzer detection and life span , and even directly cause damage to the gas sensor.
• Pay attention to temperature and humidity. Different temperature and humidity also affect the normal detection of the gas analyzer. If the temperature fluctuation in the detection environment is large, gas analyze may drift. in this case, gas analyzers can calibration is performed on-site to minimize the effect of temperature on gas detector detection results.

Generally, gas analyzers need to be calibrated to maintain high precision after being used for a period of time, but the calibration cycle is different, generally 3-6months . Our gas analyzers are equipped with an automatic zero point calibration function, which can also increase the calibration cycle. When calibrating, it is necessary to prepare the standard gas within the warranty period. Generally, the concentration of the standard gas should be selected according to the range. For some gases, gas cylinders, gas valves and pipelines should be made of anti-corrosion and anti-adsorption materials.

During calibration, the gas flow rate should be stably controlled at 1L/min- 2L/Min, or close to the actual sampling flow rate, and the flow rate should be kept stable.

can check our blog How To Choose The Right Gas Analyzer For Your Industry? A Complete Guide! – Gas Analyzer Manufacturers (esegas.com)

Gas analyzer and Gas detector are used to detect gas components but price big difference between the two devices , what is the difference between them?

• different functions

The gas detector is an instrumentation tool for gas leakage concentration detection, which belongs to the safety protection instrument. A gas analyzer is an instrument used to measure the composition of a gas

• different structure

The structure of the gas detector is relatively simple, only including the gas probe (gas sensor) and the sensor signal conversion circuit part. The gas analyzer is not only equipped with a gas sensor inside, but also has a complete set of gas circuit system including sampling system ,gas conditioning system, PLC automatic control system

• different detection methods

The gas detector uses the probe to directly expose to the measured air or sample gas environment for detection. The gas analyzer introduces the measured gas (sample gas) into the instrument for measurement through special methods (pump sampling, in-situ sampling, etc.), and then leads it out of the instrument for emptying or recycling.

• different detection accuracy

Gas detectors can only provide qualitative analysis results and relatively rough quantitative analysis data,A gas analyzer is a strict measuring instrument that can provide very accurate data when performing quantitative analysis.

This kind of data can be used as the basis for industrial production, gas production, safety and environmental protection improvement and improvement, and use it to guide and carry out production management, quality management and enterprise management. This kind of data can be used as an important basis for production technology, judicial appraisal, product quality supervision, scientific and technological arbitration, environmental protection emission inspection and other work.

• Different working conditions

The gas detector does not design the adjustment and control part of the technical conditions of the sample gas, and it does not consider the environmental conditions of the sample gas, and directly detects gases. The gas analyzer internally adjusts and controls the working conditions of the sampling gas such as high temperature, high dust and moisture

• Different methods of operation to complete the entire measurement process

When the detector is in use, just place the instrument in the measured atmosphere, and the instrument can display the measurement value. The gas analyzer must carefully introduce the sample gas into the instrument, and then strictly adjust the technical conditions of the process, such as temperature, pressure, flow, etc., only when the operator adjusts the instrument until a stable analysis of the chemical process can be obtained. Accurate measurement data.

• Different cost

Generally speaking, the investment cost of gas detectors is low, while the cost of gas analyzers is slightly higher than gas detectors.

Portable gas analyzers are small, portable gas analysis instruments that are typically used in on-site detection and monitoring applications, such as environmental monitoring, industrial safety, and indoor air quality testing.

A continuous gas monitoring system is a system that can continuously monitor and record gas concentrations, and is usually used for long-term monitoring and automatic alarms. Compared with conventional gas analyzers, it has higher sampling frequency and data logging capability.

Cross-interference refers to the phenomenon that different gas components influence each other. To deal with cross-interference, gas analyzers typically use correction algorithms and calibration techniques to reduce or eliminate the effect of interference on measurement results.

Spectroscopic analysis technology is a light-based measurement method that analyzes the characteristics of the spectrum to determine the gas composition. Common spectroscopic analysis techniques include infrared spectroscopy, ultraviolet-visible spectroscopy, and Raman spectroscopy. These techniques can be used in gas analysis to detect and measure the presence and concentration of different gases.

The collection and preparation of gas samples can be accomplished by equipment such as sampling systems, sampling probes, and gas processing devices. Sample collection usually takes into account factors such as the selection of sampling points, sampling flow rate, and sampling time to ensure that a representative gas sample is obtained.

Data analysis and report generation are usually performed by data processing software inside the instrument or an externally connected computer. Analysis software can process, count and graph the collected data and generate reports for further analysis and interpretation of the results.

Gas analyzers cope with changes and fluctuations in gas concentration by using stable sensors and calibration techniques. Calibration and automatic compensation functions help maintain the accuracy of the instrument, providing reliable measurement results even under varying conditions.

Gas analyzers can use multiple sensors or modules to simultaneously detect and measure different gas components. Each sensor is usually specially designed to detect a specific gas, and then the measurement results of each gas are presented through the processing and display system inside the instrument.

Gas analyzers usually have data recording and storage functions, and can save measurement data in internal memory or external storage devices. These data can be used for subsequent analysis, review and report generation. Some instruments also offer a data transfer feature that allows data to be transferred directly to a computer or cloud storage.

Gas analyzers typically have a variety of power supplies, including batteries, AC power, and DC power. Some portable instruments run on rechargeable batteries for use in mobile or field environments. Other stationary instruments may require connection to the mains or use of an external power adapter.

The response time depends on the operating principle of the gas analyzer and the characteristics of the sensor. If the response time is long, consider using more advanced instruments or sensors to improve the sensitivity and response speed of the equipment. In addition, ensure that parameters such as flow and pressure of the sample collection and delivery system meet the requirements to speed up the gas entering the analyzer

The drift of the gas analyzer may be caused by factors such as instrument aging, pollution, and stray light interference. Perform regular calibration and maintenance to clean the sensor and optical path to ensure the instrument is in top working condition. In addition, regularly check and calibrate the zero point and background value of the instrument, adjust and correct as necessary to reduce the effect of drift.

First, verify that the gas analyzer is properly calibrated and maintained. Calibration is a key step to ensure the accuracy of the instrument, you can refer to the calibration method provided by the manufacturer for operation. Also, check that the sensors are working properly and that the sample collection and handling methods are correct. If the problem persists, it may be necessary to contact the supplier for repair or replacement of the device.

The response time of a gas analyzer depends on several factors, including instrument type, gas concentration, sampling system, and more. Typically, fast-response gas analyzers provide measurements within seconds, while more complex or high-precision analyzers may take minutes or longer.

If the gas analyzer shows erroneous measurements, first check that it is properly calibrated and that the calibration date is not expired. If the calibration is correct and the date has not expired, maintenance and service such as cleaning the sensor, replacing consumables, or contacting the supplier for technical support may be required.

If the gas analyzer cannot detect the target gas, first ensure that the concentration of the target gas is within the detection range of the instrument. If the concentration is normal and the instrument still cannot detect it, it may be necessary to check the working condition of the sensor to ensure that the sensor is not faulty or needs to be replaced. Also, check that the gas sampling system is working properly.

If your gas analyzer’s sensor responds slowly, it may be due to aging, contamination, or damage to the sensor. You can try to clean and calibrate the sensor, or contact the supplier for maintenance and sensor replacement.