Solution Overview

Special gases, as the core basic materials in modern industry and high-tech fields, are widely used in many industries such as semiconductor manufacturing, biomedicine, aerospace, new energy, environmental monitoring, etc. Its purity, concentration, and component stability are directly related to the performance of downstream products, process safety, and reliability of end use applications.
Gas dilution, especially high-precision dilution of adsorbed gases such as ammonia and hydrogen fluoride, has always been an important step in the preparation of standard gases and a significant factor affecting their quality. The 970 series dynamic dilution instrument configured in the scheme can accurately and quickly complete the dilution of various gases.
The concentration verification of finished standard gases is an important part of enterprise product quality self inspection. The 960L automatic sampler configured in the plan can achieve high-throughput automatic injection detection of standard gases. Combined with the 990 series concentrator, it can accurately detect the concentration of customized standard gases with ultra-low concentrations.

typical scenario

System configuration for standard gas dilution and gas concentration confirmation detection scheme

Gas dilution

purpose

The BCT 970D high-precision dynamic diluter can dilute various gases such as standard gas, sample gas, and process gas. The equipment adopts the principle of dynamic dilution, without the need for storage containers or mass flow meters, to achieve full process inert treatment of molten silicon, fundamentally solving the adsorption problem in the dilution process.

standard basis

GB/T 44243-2024 Determination of Hydrogen, Sulfur Compounds, Formaldehyde, and Organic Halides for Proton Exchange Membrane Fuel Cell Vehicles by Gas Chromatography

HJ1330-2023 Determination of Ammonia and Hydrogen Chloride in Waste Gas from Fixed Pollution Sources Portable Fourier Transform Infrared Spectroscopy Method

HJ 1240-2021 Determination of Gaseous Pollutants (SO2, NO, NO2, CO, CO2) in Fixed Source Exhaust Gas Portable Fourier Transform Infrared Spectroscopy Method

HJ 1317-2023 Determination of 6 Acrylic Compounds in Environmental Air and Waste Gas Gas Gas Chromatography Method

HJ 1154-2020 Determination of Aldehydes and Ketones in Environmental Air Solution Absorption High Performance Liquid Chromatography Method

Product Features

1. Accurate dilution

(1) Inert the entire system of molten silicon:Abandoning mass flow meters and avoiding parts that cannot be inert coated, the entire system uses inert coating of molten silicon, greatly reducing system adsorption.

(2) High precision pressure sensor:The use of high-precision pressure sensors combined with sonic nozzle technology enables more precise flow control.

(3) No storage medium required:No need for storage devices (cans), reducing adsorption during storage.

2. Balance quickly

Fast and stable:Dynamic equilibrium can be achieved within 5-30 minutes, eliminating the long waiting time of several hours or even days for equilibrium in permeation tube dilution technology.

Note:Permeation tube dilution technology utilizes permeation to transfer gas from high concentration areas to low concentration areas through a semi permeable membrane, thereby achieving the purpose of dilution. It usually takes more than 12 hours to dilute to stability

3. No adsorptionNo need to use a mass flow meter, all pipelines through which the sample passes are coated with inert molten silicon to reduce residue and adsorption.

4. Wide range

Dilution ratio:The standard dilution ratio is as high as 2-5000 times.

5. Economic and Environmental Protection

(1) Save standard gas:Faster balance and less use of standard gases, especially for expensive customized standard gases, significantly reducing experimental expenses.

(2) Environmental protection and emission reduction:Less standard gas emissions, more environmentally friendly.

practical case

CO/CH in light olefins4/CO2 The determination

CO/CH4/CO2 standard series spectra prepared with BCT 970D

Performance characteristics of automatic sampler

• Application scope: Widely applicable, in addition to analyzing pollution sources such as benzene and non methane total hydrocarbons, it can also be used for comprehensive analysis of occupational health places, emergency monitoring, and evaluation of standard gas concentration.

Can connect various gas sampling devices, including syringes, sampling bottles, and Su code tanks, and can automatically inject without human supervision.

• Comes with a sampling tank pressurization function.

Equipped with two quantitative rings, it can be injected simultaneously to obtain the total hydrocarbon and methane content, or injected separately to obtain the volatile organic compound content.

The volume of the quantitative ring is 1ml (different volumes of quantitative rings can be replaced according to detection needs).

The detection concentration range is 0.05ppm-1000ppm.

All pipelines have undergone inert treatment with molten silicon, greatly reducing sample residue.

Technical Specifications

1. Host

(1) Host function: It can be connected to existing gas chromatography (GC) for the determination of benzene derivatives in air and exhaust gas samples.

(2) The sample size is 21 digits, which can be expanded to more digits.

(3) Injection method: Quantitative ring injection, standard 1ml quantitative ring, quantitative ring volume can be selected between 0.2ml-10ml.

(4) Sampling device: It can be connected to various sampling devices, such as glass syringes, sampling bags, sampling bottles (yin-yang connectors), and Suma jars.

(5) All pipelines undergo molten silicon treatment and aging to eliminate residues and ensure the recovery rate of active substances.

(6) The transmission pipeline can be heated to 150 ℃.

(7) The host has cleaning functions such as automatic pipeline cleaning, reverse pipeline cleaning, and sample pre cleaning, as well as functions such as constant pressure and temperature in quantitative circuits.

(8) Built in pressure sensor, capable of monitoring pressure range of 0-50 psi.

(9) The injection repeatability is met, and the RSD during airbag injection is ≤ 2%.

2. Dilution device

(1) The principle of dynamic dilution is used to dilute standard gases/samples, and the diluted standard gases/samples can be directly analyzed without the need for storage containers, reducing the reaction chance of target components and improving stability.

(2) The dilution principle of the sonic nozzle is adopted to control the flow rate by controlling the pressure at both ends of the nozzle, avoiding the use of mass flow meters. This enables all pipelines through which gas passes to be coated with inert materials, avoiding cross contamination.

(3) Wide dilution range: can achieve a single dilution of 2-5000 times.

(4) The dilution accuracy is less than 1%.

(5) To avoid the influence of external temperature differences, the flow control channel has temperature control function, and the temperature control accuracy is less than 0.1 ℃.

(6) Number of channels: Standard configuration includes two channels, which can be upgraded to six channels.

3. Operating System

Can achieve the operation of dilution device and host on the same workstation

Pre concentrator

Application - Enrichment and detection of trace VOCs components in gas samples

Instrument Features

1. Strong capture capability

（1）majorDesigned liquid nitrogen temperature control system:

（2）majorDesigned capture trap:

Grasping: The capture temperature can reach -190 ℃, and the temperature is more stable, making it difficult for light components to penetrate.

Analysis: The trap packing uses weak adsorbents and discards strong adsorbents such as activated carbon to fully analyze the sample.

The target substance does not decompose: weak adsorbents can be used at lower resolution temperatures during resolution → the recovery rate of thermally unstable substances is better

(Amines, sulfides, oxygen-containing and phosphorus containing compounds, with a resolution temperature of only 180-200 ℃)

(3) Independent focusing trap: All target substances are sent into the chromatographic column, with lower detection limit, sharper peak shape, and lower signal-to-noise ratio.

2. Strong ability to remove impurities

3. Strong anti adsorption ability

Boside has innovated by absorbing international professional inerting technology and created a coating technology with better inertness; Every factory produced pipeline, valve, trap, interface, etc. undergoes rigorous inertness testing.

4. High injection accuracy

(1) Accurate injection volume:By measuring the pressure changes inside a known volumetric tank, the injection volume can be directly measured. Compared with the MFC measurement method, this measurement method is not affected by sample matrix and flow rate fluctuations.

(2) Wide injection range:The standard configuration can accurately inject samples as low as 5ml, with an injection range of 5-1000ml. When using a quantitative ring, the accurate injection volume can be as low as 1ml.

5. Strong system stabilityThere have never been accidents such as uncontrolled injection of liquid nitrogen, equipment failure, or gasket breakage, and the system has strong stability.