MFC—UT series calibration applications—chromatograph

Release time：

03 Jul,2023

Summary

MFC—UT series calibration applications—chromatograph

Analytical instruments such as gas chromatographs require regular calibration to accurately determine the chemical composition of compounds. During calibration, the gas chromatograph's measurements are compared to calibration standards with known accuracy, and the instrument's values are adjusted accordingly. For gas chromatographs, such standards are gas mixtures with accurately known compositions.

Gas chromatograph operators have 2 ways to generate gas mixtures:

1. Purchase gas cylinders of premixed gases

2. Configure gas mixtures themselves

Application Requirements

The customer is looking for low-cost gas mass flow controllers with various flow ranges to create gas mixtures with Modbus protocol communication options. Their method for preparing calibration gas mixtures must comply with ISO 6145-7.

Key Issues

1. Improved Accuracy

2. Flexibility

Process Solution

This application can use the ut series of gas mass flow controllers from Qingdao Xinnovis Microsystem Technology Co., Ltd. Features: Small size, lightweight 。 Up to 12 gas cylinders connected to an equal number of mass flow controllers. Precisely controlled airflow enters the mixing chamber, and the mixture is then sent to the gas chromatograph for calibration.

The ISO 6145-7:2009 standard describes the procedure for preparing calibration gas mixtures using commercially available thermal mass flow controllers. The accuracy of the final gas composition leaving the gas mixer is calculated by dedicated software that takes into account the uncertainty of the gas flow (due to the mass flow controllers) and the uncertainty of the initial cylinder gas composition.

On-site preparation of gas mixtures offers several advantages compared to purchasing cylinders with premixed gas mixtures. For example, premixed gas mixtures have a limited shelf life. The cost of such premixed gas mixtures is quite high, and users are unsure whether the gas concentration is still good or whether the mixture is still homogeneous.

Therefore, users can prepare gas mixtures with very low concentrations of specific compounds themselves. Operators do not have to invest in mixed gas cylinders, greatly improving the flexibility and freedom to calibrate analyzers on their own time.

Reasons for the customer to choose Qingdao Xinnovis gas flow controller equipment: The entire “solution” has a suitable purchase price, higher accuracy and flexibility, integrated Modbus protocol and professional pre-sales and after-sales service.

Recommended Products

Compact Gas Mass Flow Controller —UT

The UT series adopts the company's new integrated design concept. While maintaining high accuracy and stability, its size and weight are reduced to 1/6 and 1/5 of current conventional products, respectively. This product can be used in high-end instruments and equipment such as mass spectrometers, spectrometers, gas chromatographs, and gas blending instruments.

Product Features

Compact structure, easy to install Superior zero stability Temperature and pressure insensitive Good repeatability and reproducibility Ultra-fast response speed Equipped with high-end electromagnetic proportional valves