READING DRAEGER DETECTOR TUBES IN CONJUNCTION
WITH THE SAFE-AIR TESTER
Each pack of tubes has its own instruction leaflet but the following notes should help you take readings after
the tests have been completed.
Oil (67 28371)
THE AIR SHOULD HAVE A MAXIMUM OIL CONTENT OF 0.5 MG/M³ AND
SHOULD BE WITHOUT SIGNIFICANT ODOUR OR TASTE.
Hold the tube in a vertical position with the white media at the bottom. Bend the tube at the breaking point
marked with 2 dots so that the outer glass tube and inner ampoule break. There is a shrunk-on plastic cover
protecting this area of the tube. The liquid in the ampoule is concentrated sulphuric acid so great care must
be taken to hold the tube away from you while gently tapping it to force the liquid onto the indicating layer of
small white crystals which is an activated silicagel.
the white crystals will turn translucent and show at worst a
slight discoloration.
(Mineral oil) - the white crystals will show a light brown or darker discoloration.
(Synthetic oil) - the white crystals will show a yellow discoloration [Note: best seen by
comparing with an unused tube].
Water (H
2
O) (67 28531)
FOR AIRLINES BELOW 40 BAR THE PRESSURE DEWPOINT TO BE 5°C BELOW
THE LIKELY LOWEST TEMPERATURE. WHERE THE LIKELY LOWEST
TEMPERATURE IS NOT KNOWN THE PRESSURE DEWPOINT SHOULD NOT
EXCEED -11°C.
FOR HIGH-PRESSURE CYLINDERS THE FOLLOWING UPPER LIMITS APPLY::
40 TO 200 BAR = 50MG/M³, ABOVE 200BAR = 35MG/M³
FOR HIGH-PRESSURE CYLINDER CHARGING COMPRESSORS THE UPPER
LIMIT = 25MG/M³
A reddish brown discoloration will show the extent of the water content, which is read from the scale printed
on the tube in mg/m³.
When using the HI range setting, the tube reading is multiplied by a factor of 10, i.e. a tube reading of
150mg/m³ becomes 1500mg/m³. To establish the pressure dewpoint refer to the graph on the back of the
Safe-Air Tester Result Sheet.
Carbon Dioxide (CO
2
) (67 28521)
MAXIMUM READING OF 500 PPM.
The media in the detector tube will discolour to show the presence of carbon dioxide. The total length of the
discoloration read from the printed scale at that point is a measure of the concentration in parts per million.
Carbon Monoxide (CO) (67 28511)
MAXIMUM READING OF 5 PPM.
The media will discolour to show the presence of carbon monoxide in the air sample. The total length of the
discoloration is the measure of concentration read directly from the scale in parts per million.
IMPORTANT – IT IS RECOMMENDED THAT YOUR SAFE-AIR TESTER IS RETURNED FOR
RECALIBRATION AND SERVICING WITHIN 12 MONTHS FROM THE ISSUE DATE OF ITS
CALIBRATION CERTIFICATE
- 13 -
APPENDIX 3
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