According to the needs of the gas chromatograph, after the analyst fills a column, in order to ensure high sensitivity analysis, the new column should not be connected to the detector without aging. The aging treatment of the column is very necessary. There are two purposes for aging: (1) In order to completely remove the residual solvent and some volatile impurities in the stationary phase, the detector is protected from contamination and has a low current. (2) Further promoting the uniformity and firm distribution of the fixing liquid on the surface of the support can improve the efficiency of the column. The aging of the column is judged by connecting the column to the detector and the stability of the baseline during normal operation. For the evaluation of the separation performance of a column, generally, the suspending property is used to evaluate the suitability of the stationary phase selection, and the column efficiency is used to evaluate the separation condition selection, and the resolution is used as a column. An indicator of total separation performance. For more information on this section, please refer to the monograph on gas chromatography. Generally, the installed column needs to be aged before it can be connected to the detector. The way of aging is to connect the column to the carrier gas path system (for safety, nitrogen is generally used as carrier gas). One end of the column is connected to the vaporization chamber, and the other end is emptied (not connected to the detector to prevent Contamination), with a carrier gas velocity of 10-20ML/MIN, slightly above the operating temperature of 10-20 degrees, and ventilate for 4-8 hours or more. After the basic aging is good, check the detector. The aging process ends when the recorder's baseline is flat. Be sure to use nitrogen gas when aging the column, and do not use hydrogen! Tianjin Rambo Experimental Equipment Co., Ltd. is looking forward to your joining
We have a variety of designs for Intercom System With Tuya, different sizes, different keys, etc., you can refer to our pictures,
We have been focusing on independent research and development of intercom system with tuya
since 2011. We have professional reach and devolve team to serve you, and we can provide you with professional products and services, If you need more information about our factory or intercom system, please do not hesitate to contact us, we are very honored to share catalog with you.
Smart doorphone with tuya is an intercom system that can be connected to a mobile phone. The system adopts a unified TCP/IP networking architecture to connect all-digital video intercom, security equipment and elevator linkage system. At the same time, it can be connected to the central management machine. The property community can better manage tenants, improve user experience and property services, etc. They use POE switches to connect multiple indoor units and video door phones, and POE switches supply power to the indoor units. The wiring is very simple and convenient, and the overall cost is low.
Smart doorphone with tuya improves user experience, because users can receive call information, and can monitor Video Door Phone at any time through tuya application, even if users are in an office, picnic or travel, they can immediately receive call information from visitors , and talk to them, you can also monitor visitors. If it is the user's friend, it can also remotely unlock the visitor on the mobile phone, which is very convenient.
The video doorphone in the picture is the most popular model from our company - MK-AZZJ4C, we have adopted the embedded design, which is very classic and beautiful. It is also an Android system, which can support simultaneous connection of multiple indoor units and mobile phones to realize remote monitoring, calling and unlocking on the mobile phone. We have also added the function of face recognition and LED fill light, which can clearly monitor and unlock using face recognition even at night. Ideal for multi-apartment, hotel and community applications.
The following are the parameters of MK-AZZJ4C for your reference:
1. 4.3 inch 720 HD display TCP/IP Intercom system
2. Calling, intercom, unlocking, monitoring
3. High quality aluminium alloy frosted panel + high-end glass lens + sensor buttons
4. Digital camera, stable and clear image shooting
5. Night vision and bright light compensation function
6. Full duplex voice intercom, comparable to ordinary telephone intercom
7. Android system ,ARM CPU, TUYA App (support Android and IOS system)
8. LPDDR3 1 GB memory, standard EMMC 8 GB storage expandable
9. RJ45 standard ethernet interface all-digital design
10. Low power consumption technology solution, saving energy and long life span
11. Dimension:400*140*51(mm)
12. Install method : Wall/flush install (390*130*46 mm)
13. Image/video advertising playback (advertising can be customized)
14. Door opening:IC/ID card/ password/ face recognition/ mobile phone
Our company has been focusing on intercom system for 11 years, we can provide you with different systems, like IP, 2 wire and 4 wire system, and we are also OEM & ODM factory, support to customize your brand and function, Thank you very much for your interest in our products, if you need more detailed information, please feel free to contact me.
Smart Doorphone With Tuya,Tuya Smart Doorbell,Tuya Video Doorbell,Tuya Smart Video Doorbell Zhuhai Mingke Electronics Technology Co., Ltd , https://www.zhmkdz-electronics.com
Gas chromatograph use and aging treatment