Siemens LDS 6 - Page 26

WARNING
Ingress of dust and humidity
To prevent ingress of dust and humidity the owner must assure that the ambient temperature
of the Ex-relevant ingress protection area does not exceed the values speci󹪝ed in
Chapter Technical data (Page59).
Explosion Protection - II 1GD T135 °C EEx ia IIC T4 IP65
The LDS 6, with a central unit and optics housings interconnected with optical 󹪝bers,
is explosion safe. Only a limited, low energy part of the electronics is located at the
measurement site. The distance between the central unit and the optics housings can
be several hundred meters. The LDS 6 system is available in an Ex version and is then
delivered with an approval for use in hazardous environments. The ATEX certi󹪝cate is a
system certi󹪝cate and is only valid if LDS 6 is installed according to the instructions given in
the certi󹪝cate.
Approval
The concept of the EEx approval is that the central unit is unchanged from a standard unit
and that a special EEx optics housing pair (CD 6 Ex) is used in the hazardous zone. In addition
to this an explosion protection barrier is added before entry into the hazardous zone. An
absolute condition for the approval is that the equipment is set up according to the drawing,
ADM 30403050, please refer to the separate ATEX manual for LDS6.
The protection is as follows:
Cross Duct optics housing -
II 1G Ex ia IIC T4 II 1D IP65 T135 °C.
Central (Barrier) Unit - II (1)G [Ex ia] IIC II (1)D [Ex iaD].
• Equipment Group: Group II - Surface.
• Equipment Category: Category 1 D - Zone 20. Flammable material can be present
continuously, frequently or for long periods, in gas and dust.
• Type of protection: Ex ia. The equipment present in the hazardous area is intrinsically safe.
• Explosion group: IIC. This corresponds to a gas group containing Acetylene and Hydrogen.
• Temperature class: T4. The maximum surface temperature on the equipment is 135°C
(275°F) and the ignition temperature of the gas or vapor is between 135°C (275°F) and
200°C (392°F).
• The optics housing protection is IP65 and the ambient temperature must be between
-20°C (-4°F) and +60°C (140°F) .
Liability
Following commissioning, the total responsibility lies with the owner.
Installing/mounting
3.3Safe installation
LDS 6 & Optics housing CD 6 Compact Operating Instructions
26 Compact Operating Instructions, 12/2022, A5E03314905-AB