Calibration bag for oxygen meters

Calibration bag for oxygen meters

When measuring low oxygen concentrations, the accuracy of the instruments is very important. For nitrogen fumigation it is important to be able to check the measured values for reliability. For this we have developed a calibration bag. It is 43 x 29 cm and consists of the barrier films ESCAL (transparent top) and aluminum composite film 30 T (bottom). It contains 10 sachets of ATCO FTM 1000S, 5 oxygen indicators Ageless-eye and approx. 1 - 2 l of air. After 24 h, the oxygen concentration in the bag is <0.1% residual oxygen. The oxygen indicators indicate by their pink color that this concentration is reached. After a few days, the oxygen concentration is virtually zero. This makes it very easy to check oxygen meters such as the GMH 3692-GOG-L.

The procedure is as follows

• Stick a sponge rubber pad near a corner
• Piercing the cannula through the sponge rubber pad (without damaging the aluminum composite foil on the underside)
• Carrying out the measurement. In this case, about 0.2 l of air are removed from the bag.
• Pull out the needle
• Welding the corner with a vacuum sealer (pliers or tabletop), so that the bag is tight again.
  Measurements can be taken again after 24 h, even if small amounts of oxygen should have gotten into the bag during the first measurement

Taking individual oxygen indicators

The calibration bag can also be used to extract individual Ageless-eye oxygen indicators. For this an Ageless-eye is shaken in a corner. This corner is welded with a vacuum sealer. Then you can cut off the corner and remove the Ageless-eye. The advantage is that a single oxygen indicator can be taken without the other indicators coming into contact with oxygen.