The standard gas diluter replaces traditional mass flow controllers with electronic volume control, reducing the contact surface area and residual amount in the mixing area, significantly improving dilution accuracy and stability. Meanwhile, maintaining a high pressure in the steel cylinder helps to maintain the chemical properties of the internal substances unchanged and prolong the service life of the standard gas. The multi-level dilution capability can generate extremely low concentration standard gases to meet different experimental needs. In addition, the multi-purpose function of the device enables it to be used for both static configuration and dynamic online monitoring scenarios, optimizing laboratory space utilization and reducing operating costs.

Its control system allows for fully automatic and accurate adjustment of gas ratios, supports multi-point calibration to be completed in one go, and simplifies complex experimental processes. The software controlled switching function further improves the convenience and repeatability of operation, reducing human errors. For the treatment of toxic and harmful gases, this instrument can safely dilute them to a detectable range, and with the help of gas detectors, achieve rapid response, effectively ensuring personnel safety. The closed hybrid system also reduces the risk of leakage and enhances the safety of the working environment.

Measurement steps of standard gas diluter:

1. Parameter setting: Set the target concentration according to the requirements, and the device will automatically calculate the corresponding flow ratio. For example, if the target concentration is 30 LEL, it may correspond to a combination of standard gas flow rate of 0.3 L/min and zero gas flow rate of 0.7 L/min.

2. Calibration operation: Use certified standard gas for calibration to ensure that the indication error is ≤ 1; Record calibration results and lock parameters to prevent modifications caused by misoperation.

3. Span mode selection: Choose the appropriate working mode according to actual needs, such as "zero point", "span 1-5" or manual mode, and achieve different concentrations of output by adjusting the mixing ratio of standard gas and zero gas.

4. Instrument initialization check: After turning on the gas generator, observe whether the pointers of pressure gauges for air, hydrogen, nitrogen, etc. have reached the specified position; Simultaneously turn on the power switch of the chromatograph, adjust the inlet temperature, column temperature, and detector temperature to the set values, and wait for them to stabilize before proceeding to the next step of operation.

5. Sample injection and detection: The processed sample is accurately and uniformly injected into the chromatographic column inlet through an automatic or manual sampler to ensure the accuracy of the analysis results.

6. Concentration verification: Use a calibrated high-precision gas analyzer to verify the output concentration. If the error exceeds ± 2, the mass flow controller (MFC) needs to be recalibrated to ensure accuracy.