翻译成英文电子邮件

Dear Mr.XX/ Ms.XX,
I am from XX company, and recently, we are working on a methane gas detection project which is based on TDLAS technology. We need a gas reference section, and we want to know that if you can make it, that section should be fulled with methane gas (for example, like 20% methane gas).
Thank you for taking time to read my letter.
From, XX

HI,
I am from XX. I am doing a methane gas testing project which is based on TDLAS technology. I need a gas unit for reference.
Could you make a referenced unit and fill some methane gas with certain concentration such as 20% methane gas.

Thank you!

Hello, I'm XX units are now being done TDLAS-based methane gas detection technology projects that require a gas reference cell. Does your company can customize a reference cell, which filled a certain concentration of methane gas (such as 20% methane). Thank you!

Hello, I'm from XX, now I'm involved with a methane detection project based on TDLAS. I'd like to buy a gas reference unit. May I ask if I can order a specific reference unit with a certain degree of methane like 20%? Hoping for reply, thank you!

Hello, I'm XX unit, a detection of methane gas based on TDLAS technology project is doing now, a gas need reference unit. Do your company whether can customize a reference unit, which is filled with a certain concentration of methane gas (such as 20% methane gas). Thank you.