Astar HT-3300 Dokumentacja Strona 12

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2
Reference Manual
00809-0100-4811, Rev DA
Section 1: Introduction
January 2015
Introduction
The electronics enclosures are category 2G or 2D equipments. The probes not covered with
plastic are of category 1G or 1D. The plastic-covered probes are only category 1G
equipments.
Probes with non-conducting surfaces and light metals
Probes covered with plastic and/or with plastic discs may generate an ignition-
capable level of electrostatic charge under certain extreme conditions. Therefore,
when the probe is used in a potentially explosive atmosphere, appropriate measures
must be taken to prevent electrostatic discharge. These probes are not allowed in dust
classified areas.
The following probes do not contain plastic or PTFE material, and are allowed to be
placed in a Dust classified area:
The Material of Construction Code in the above table can be found in the following
position in the Rosemount 3300 Series model code: 330xxxxxN...
Probes and flanges containing >7.5% Magnesium or Zirconium are not allowed in
explosive dust atmosphere. Please contact Rosemount Tank Radar for additional
information.
Probes and flanges containing light metals
When used in category 1/2G installations, probes and flanges containing Titanium or
Zirconium must be mounted in such a way that sparks from impact or friction
between these parts and steel cannot occur.
Code Material of construction:process connection/probe
1 316L SST (EN 1.4404)
2 Alloy C-276 (UNS N10276)
3 Alloy 400 (UNS N04400)
H Alloy C-276 (UNS N10276)
D Duplex process connection
Category 2G or 2D
Category 2G or 2D
Category 1G or 1D
Probes according to table
Category 1G
All probes possible
Applicable
Marking:
II 1/2 G Ex d [ia Ga] IIC T6...T1 Ga/Gb
II 1/2 D Ex tb [ia Da] IIIC
T85 °C...T450 °C Da/Db
II 1/2 G Ex d [ia Ga] IIC T6...T1 Ga/Gb
II -/2 D Ex tb IIIC T85 °C...T135 °C -/Db
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