Before sampling can commence, ensure that the filter drain plug (a)
is inserted into the base of the filter bowl (b).
5.4.2 Filter Replacement - it is advisable to replace the filter
elements (e & f in Fig 4) when they appear dirty (see re-ordering
information on back page) to prevent filter inefficiency due to
blockage from particulate contamination or water saturation.
Following removal of the filter bowl (as described in 5.4.1) the filter
elements stick due to compression of the filter material and they can
be removed gently by pulling the filter inner disc (d) and gasket (c)
from the filter assembly. The filter elements should be discarded, if
damaged or irretrievably contaminated (see above), or reclaimed by
drying if water saturated. The filter unit should then be reassembled
as described previously (5.4.1).
5.4.3 Water Removal - the water level in the transparent filter bowl
(b) can be observed during operation from the side of the unit and
the filter bowl should be drained of water at any convenient time,
such as before sampling, or before the water level reaches the base of
the filter inner disc (d) and gasket (c). When draining the filter bowl
the sampling pump of the
TEMPEST 50
unit should be switched off
(refer to Section 6.3, 6 - Pump (On / Off)) and no emissions data (8
in Section 6.1) should be collected during this short period of time.
The filter bowl drain plug (a) should be removed from the filter bowl
(b) and water allowed to drain away completely. It should be noted
that removing the filter bowl drain plug will allow the ambient
atmosphere to dilute the sample gas stream in the unit and no
emissions data should be collected until this residual air has been
thoroughly flushed through the sampling system. After reactivating
the pump (see 6.3, 6 Pump (On / Off)) allow 60 seconds to
thoroughly flush the sampling system.
5.5
Exhaust Removal
If the instrument is to be used in a confined space, the exhaust gases
that exist the
TEMPEST 50
unit following analysis can be vented away
from the user. Attach a suitable connector or flexible tube with the
required minimum internal diameter (15mm) to the exhaust spigot
located on the base of the unit. Care must be taken to ensure that this
vent is not blocked in any way that would prevent the transport of
exhaust gas along the tubing.
