Maintaining Your Oxygen Equipment

Mar 30, 2021

3 Easy Steps to Maintaining Your Oxygen Equipment:

FDA guidance requires that filling equipment be calibrated at specific intervals, depending on the type of equipment.

Don't forget you need to document all calibration! 




1. Daily

Each fill day, you'll need to calibrate your paramagnetic analyzer.

The paramagnetic analyzer (such as the popular Servomex) is NOT the same as a handheld analyzer. It is a sophisticated analyzer that can gauge the purity of your oxygen drug product, and is a required step in filling gas cylinders. You should calibrate your analyzer with special oxygen and nitrogen created for the purpose, and that comes with a valid COA (Certificate of Analysis).



2. On Your Schedule

Regulators, Conservers, Concentrators and Other Equipment:

Accreditation agencies have many different policies, but one that seems to be universal across the board: You must have a policy written for maintaining your equipment, and you must follow it.

Many manufacturers of oxygen equipment have suggested maintenance in their manuals that can be used for writing a equipment maintenance program, and industry standards may also provide guidance. For example, the Compressed Gas Association standard E-7 recommends that all regulators be inspected and taken out of service if necessary every five years. To help you stay compliant, Applied offers a discount on regulators if you fill out our inspection form and indicate how many regulators you have taken out of service.

Check out for our form.


3. Annually

Your filling equipment is used in the manufacture of a drug product, and must be maintained according to manufacturer's standards, or FDA requirements. Here's what we recommend for some essential filling equipment.


Servomex Paramagnetic Analyzer:

FDA requires that firms maintain their equipment to the standards listed in the equipment manufacturer's standards.  The Servomex equipment manual recommends annual preventative maintenance for it's model 5200 (#OF-941), and the majority of the industry sends any model unit in for preventative maintenance.

Applied's A+ check (#OF-936) for Servomex Paramagnetic Analyzers is a quick and affordable way to have routine annual maintenance performed on your unit. Applied's seasoned technicians and experts will perform our exclusive A+ service and calibration test on your unit, and return it to you in 3 business days from receipt. (Rush 24 hour turn around available for a nominal fee). Or rental units are available for a weekly rental, and include free shipping. A + Check also keeps you compliant year round with a convenient maintenance book to show accreditors. 


Gauges and Thermometers:

Vacuum and High Pressure gauges and thermometers (digital and infrared) should be calibrated to NIST standards annually. Many people choose to use our NIST lab to calibrate new equipment for them, or they choose to send in their equipment to our lab for calibration and certification. 



Pigtails used on your transfilling system, if maintained properly, can last for up to 3 years. Every time you fill, you should visually inspect your pigtails for damage. If there are kinks or weak points, such as from folding, the pigtails could snap from the high pressure and become dangerous to you or others. 

Additionally, Applied recommends that your pigtails that are used with transfilling systems be tested annually to ensure that they are safe for use. And, you should also test them if you suspect there might be a problem with them. Perform the following inspections on pigtails. If the pigtail fails any inspection it should be removed from service and either repaired or replaced. Don’t forget to wear proper safety equipment when testing high pressure equipment.    


  •  Visually inspect pigtails for corrosion, kinked areas, crimps, or any other external damage.
  •  Spray the pigtail and its connection point with an oxygen compatible leak testing solution. The solution will form large bubbles if a leak is present.
  • Conduct pressure testing on the pigtail by slowly pressurizing the pigtail and checking for damage. 
  • Inspect the threads of the connection. If the threads are damaged, the connection should be replaced


For any questions, contact us at or call 888-327-7301.

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