- 5 -
- 4 -
Water vapour detector tubes
20 to 160 mg/m3 water vapor at a flow rate of 1 l/min
and a measuring time of 5 min. (required sampling
volume 5 l) or 5 to 70 mg/m3 water vapor at a flow
rate of 1 l/min and a measuring time of
10 min. (required sampling volume 10 l).
See also specific instructions for use of the
KWIK DRAW
/ MSA AUER detector tubes H O-HP.
2
All values above are based on air not under pressure
and at room temperature and normal pressure.
5. Operating Instruction
5.1 Preaparing for Measuring
5.2 Measuring on Compressed Air Cylinders
When the test device is clean and dry flushing for
2 min. is sufficient. If the condition of device is not
known, or if during a previous measurement higher
values were found than are permissible according to
EN 12021, flushing at 2 l/min. must be continued.
T h i s m u s t b e d o n e u n t i l 2 w a t e r v a p o r
measurements, made at an interval of approx. 15
min., give identical results within the permissible
measuring accuracy range. It then can be assumed
that the test device is sufficiently clean for making
measurements.
.
Liquid/ water (droplets) can only be removed from
the test device through long flushing with dry, if
necessary warm air. .
.
Observe arrow on the detector tube. The arrow
points in the flow direction of the test air; therefor,
after inserting the tube, the arrow must point away
from the test device. .
Clean valve of compressed gas cylinders or
charging connections of compressor with brief
burst of air. .
Chose and connect the adapter suitable for the
prescript maximum pressure of the compressor
charging panel (300 or. 200 bars). .
Connect pressure reducer to compressed gas
cylinder, or to charging connection of compressor
using the adapter. .
Insert and firmly fit the nozzle of manifold on the
pressure reducer as shown in fig. 2
.
.
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Break off the detector tube tips at air exit side
(see fig. 5)
.
Put detector tube into the tube holder, inserting
broken-off end tightly into holder side away from
test device.
.
Break off other end of the detector tube (air entry
side) and immediately insert open tube tightly into
other end of detector tube holder (close to test
device). (see fig. 6). .
Immediately thereafter start the timer to the time
designated for the type of detector tube.
Remove the detector tube of CO, CO2 and H2O
after 5 minutes from the tube holder and take the
readings from the printed scale on the tube.
Remove the oil detector tube from the tube holder of
test device after 24 minutes and take the readings
from the printed scale on the tube.
5.3 Measuring on compressors
Switch on the compressor
Wait until 200 or 300 bar are reached
Switch off the compressor
Slowly open valve on compressor
Flush test device as scripted in para. 5.2
The water content that is measured in air from a
compressor only corresponds to the water content of
compressor gas cylinders simultaneously charged, or
cylinders charged immediately after measuring, if a
pressure retaining valve is built into the compressor at
the exit side of the drying cartridges. A prerequisite,
however, is that the cylinders to be charged are dry.
The pressure retaining valve assures that the pressure
inside the compressor drops only insignificantly from
the maximum pressure of 300 or 200 bar, when
cylinders are being charged. With compressor that has
no pressure retaining valve behind the filters, water
from the drying cartridge can be released to the
sudden decompression when the charging connection
is opened. The air has then higher water content as
was measured on the compressor charging panel.
.
MSA AUER compressors normally have a pressure
retaining valve.
5.4 Permissable Test Results:
CO Contents
CO Contents
2
Oil Contents
Water Contents
max. 15 ppm
max. 500 ppm
max. 0.5 mg/m³
max. 50mg/m³ rel. to 200 bar)
max. 35 mg/m³ (rel. to 300 bar
max. 25 mg/m³ (if sampled from
compressor)
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Fig. 2: Inserting manifold nozzle to
Pressure reducer coupling
Fig. 5: Breaking off detector tube tips
Fig. 6: Inserting detector tube into detector tube
holder
Slowly open cylinder valve. .
The flow rate of air through each port of manifold
can be confirmed if necessary by using the flow
meter provided with the kit. (To measure the flow
rate connect tubing of flow meter to the desired
manifold port- Fig:3) .
Insert the detector tube holders in the manifold
ports- Fig:4 .
Flush device for sufficient time to make the test
device free from other gases if any. .
.
Fig. 3: Connecting flow meter to
manifold port
Fig. 4: Inserting detector tube holder
in manifold port
