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www.madur.com Manual maMoS 100/200/300/400
4.1.2. Connecting the gas hoses
To assure proper measurement results it is necessary to supply the examined gas
to the monitor and to remove it from the device in an appropriate way. The supply and
waste gas hoses as well as the condensate outlet hose should be made of materials res -
istant to chemical agents whose influence they might be exposed to. Most often silicone
hoses are used.
As the waste gas might be poisonous or flammable, it should be removed directly
to a ventilating flue or back to the gas source. The condensate exiting from the device
should be collected in a container resistant to corrosive substances. In order to ventilate
the monitor properly the ventilation gas inlet should be connected to a source of inert gas
which contains 20.95% of O
2
and no toxic gases - most often fresh air.
Attention!
Neither the measurement gases nor the ventilation gas should be
supplied to the device under pressure. The monitor is equipped
with a pump for drawing gas samples. The maximum overpressure
is 20 hPa and the maximum underpressure is -50 hPa.
There should be no pressure applied to the gas outlet of the device either. This is
particularly important if electrochemical sensors have been installed in the device. A pump
drawing the gas directly from the outlet should not be used.
The hose bringing the gas sample should be connected to the inlet on the right
side of the dryer – in case of the mamos equipped with MD2 gas dryer ( Picture 24.). In
case of MD3 dryer the gas inlet is located in the front panel (Picture 25.) The input is not
barbed and its outside diameter is 5 mm. It is advisable to use a silicone hose 3 x 2 mm
(inside diameter x wall thickness). In order to avoid water condensing in the hose the user
should limit the hose length and avoid dips in the hose. The gas should generally flow
downwards from the sampling point to the instrument.
The input of the hose transporting the ventilation gas (fresh air) is placed at the
bottom of the monitor casing (Picture 26.) and it is the same size as the gas inlet. Most of-
ten there is no need to connect any hose to this inlet – then the device uses the air from
the surroundings. If the composition of the surrounding air does not resemble the composi-
tion of “fresh" air, the ventilation gas should be supplied with the help of a hose. Silicone
hose (3 x 2 mm) should be used here as well.
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