MSA AUER
Airtester HP
for compressed air according to EN 12021
Instruction for use
1. Use
The compressed air monitoring set ”MSA AUER
Airtester HP” (HP = high pressure) is used to
determine the content of carbon monoxide, carbon
dioxide, oil and water vapour in respirable air from
compressors and compressed gas cylinders.
According to EN Standard 12021 air for respiratory
equipment must meet the following quality
requirements:
-
CO content max. 15 ppm
- CO
2
content max. 500 ppm
- Free of odor and taste, i.e. practically free of
critical mineral oil content (from experience the oil
content is less than 0,5 mg/m
3
)
-
Water contend in compressed air cylinders:
max. 50 mg/m
3
at a charging pressure of 200 bar
max. 35 mg/m
3
at a charging pressure of 300 bar
max. 25 mg/m
3
of the air from the compressor
The requirements concerning the maximum water
vapour content refer to the type of equipment used
(200 or 300 bar) and, therefore , apply also to each
pressure level of the compressed gas cylinders
below the maximum values given above.
All maximum values are based on air not under
pressure.
1. Measuring
Principle
The pressure in the compressed gas cylinders, resp.
in the compressor charging panel is reduced by a
pressure reducer. The air to be sampled is
withdrawn continually via a regulatory valve. After
setting the prescribed flow volume (flow meter), the
air flows through a special detector tube for a specific
time. The length of stain in the detector tube is an
index of the concentration of the measured
substance. This can be read directly from the
detector tube scale.
3. Design
The case contents all parts required for measuring
(see fig. 1):
- The test device, consisting of pressure reducer,
pressure gauge, flow meter with adjusting valve
and water level, detector tube holder
-
Adapter for connection to a compressor charging
panel (for charging connection 300 resp.
200 bar)
- Timer
-
Tube breaker for breaking detector tube tips
- Detector tubes (package of 10) for measuring
CO, CO
2
, water vapour and check for oil (sum of
vapour and mist).
The standard case contents one package of each of
the four types detector tubes. In addition the case
has space for storing four additional spare packages.
Fig. 1 MSA AUER Airtester HP
4. Technical Data
Operation medium:
air
Maximum pressure:
300 + 30 bar
Flow:
Freely adjustable from 0,2 to
3 l/min.
The measuring tube of the
flowmeter is marked for the
setting of the required flow
volume (0,3; 1,0 or 2,0 l/min)
Weigth (with case):
5 kg
Dimensions:
h= 120; w= 320; l= 420 mm
Measuring ranges of the Detector Tubes:
Carbon monoxide detector tubes
5 to 70 ppm carbon monoxide at a flow rate of
0.3 l/min in a measuring time of 5 minutes. (required
sampling volume 1.5 l).
See also specific instructions for use of the MSA
AUER detector tubes CO-HP.
Carbon dioxide detector tubes
100 to 2000 ppm carbon dioxide at a flow rate of
0.3 l/min in a measuring time of 5 minutes. (required
sampling volume 1.5 l).
See also specific instructions for use of the
MSA AUER detector tubes CO-HP.
Oil detector tubes
Check for oil contents ( mist) at a flow rate of
2 l/min in a measuring time of 30 minutes. (required
sampling volume 60 l). The oil content is determined
whether the discoloration goes beyond the warning
mark or not.
See also specific instructions for use of the
MSA AUER detector tubes Oil-HP.
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Summary of Contents for Airtester HP
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