Annex
A pressure test (40 mbar, twice of nominal pressure according IEC 61010) is made with each device before delivery, whereby a
maximum permissible pressure loss of 5 mbar is allowed in 6 minutes (2 mL Gas; safety factor 20). The electrochemical sensors
which are only periodically exposed to a permissible pressure loss of 8 mbar/min may not be exceeded (safety factor 3).
Arcing, Sparking and Hot Surfaces
Normally, there is no risk of arcing, sparking or hot surfaces on the outside of the device. There is also no risk of arcing, spark-
ing or hot surfaces inside, if no cables are disconnected during operation, the device is kept closed and there no condensing
moisture and not much dust inside. This is normally fulfilled because the interior is slightly heated and thus no condensing oc-
curs inside and there is no fan built in. The device is however not tested according to IEC 60079 series standard and the be-
haviour strongly depends on the type and extent of pollution.
The hot infrared source cannot ignite hazardous atmosphere (tested by DEKRA Germany).
Risk Assessment
A risk assessment according tot he Machinery directive according to ISO 12100-1 „Safety of Machinery“ is re-assessed for all
product modifications.
EMC
IEC 61326-1 “Electrical equipment for measurement, control and laboratory use. EMC requirements. General requirements” is
applied for electromagnetic compatibility.
Connection Sampling to Hazardous Gas
Tubes inside the device have an inner diameter of 4 mm. Tests with 11 cm long tubes (Propane) and literature review showed
that the tubing works as a flame arrester. Therefore no extra flame arresters are needed if gas like methane or propane (IEC:
Gases IIA) are connected. If high hydrogen concentrations are in the gas, flame arresters are needed.
Remark:
The
2/-
in the marking means that gas from zone 1 is sucked in, the device itself however is placed outside of the zone.
Connection Air Supply to Hazardous Gas
The standard ISO 80079-36 „Non-electrical equipment for explosive atmospheres – Basic method and requirements“ is used in
the risk assessment for the option „AwiDesulf“, where non electrical components are built in into a potential hazardous atmos-
phere.
Langenbach, 27th November 2020
Dr.-Ing. Ernst Murnleitner
(Management and contact person for queries)
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