Explosion protection.pdf - Siemens

F1
F2
F3
F4
F5
F6
On
Off
Ent
Intrinsically Safe Sensor
for Explosion Group IIC in Zone 0
Central unit
7 8 9 Del
4 5 6
1 2 3
• 0 —
LDS 3000
Laser Diode Spectrometer
Ex protection for CD 3002 Ex
• Area classification: Zone 0
• Type of protection: Ex ia
• Explosion group: IIC
• Temperature class: T4
Ex-barrier
Ex-transmitter
Ex-receiver
Hybrid cable
Loop cable
Your
eye
in
hell
Benefits
• Intrinsically safe - no pressurized
or powder filled
enclosings.
• Cost efficient - most parts of
the Ex-classified instrument is
standard equipment.
• The approval of CD 3002 Ex
meets the demands of most
measurement situations imaginable.
• Minimized maintenance by
design for rough environments
and electromagnetic fields.
• Local service and representatives
throughout the world.
• Experience from several installations
in Europe.
Siemens Laser Analytics

Explosion protection class for CD 3002 Ex
Introduction
One major advantage of the Siemens Laser Analytics concept
with a central unit and sensors interconnected with
optical fibres is the relative simplicity to achieve Ex-protection.
Only a limited, low energy part of the electronics is
located at the measurement site. The distance between the
central unit and the sensors can be several hundred meters.
The LDS 3000 system has an approval for use in a hazardous
environment were explosive gases are in use.
CD 3002 Ex combined with i.e. steam purging will provide
a flexible, virtually maintenance free measurement situation
in the most difficult and hazardous places.
Approval
The concept of the Ex approval is that the central unit
is unchanged from a standard unit and that a special Ex
sensor pair is used in the measurement zone. In addition
to this an Ex barrier is added at the point of entry into
the hazardous zone. An absolute condition for the approval
is that the equipment is set up according to the Siemens
Laser Analytics drawing, ADM 3040 3050.
The protection for CD 3002 Ex is as follows:
• Area classification: Zone 0. Flammable material may be
present continuously or for long periods.
• 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 and the ignition temperature
of the gas or vapour is between 135°C and
200°C.
The Ingress protection is IP 65 and the ambient temperature
must be between -30°C and +60°C.
Labelling
There are three different points that require Ex labels, the
barrier, the transmitter and the receiver. These labels are
similar and states protection class and installation requirements.
The label below is for the receiver.
Siemens Laser Analytics
Östergårdsgatan 2-4, Box 5065, 402 22 Gbg, Sweden
Gas Analyser model CD 3002 Ex
Warning: For installation follow System drawing 3040-3050 1C
Art. no. 3040-3052 1D Receiver Ex
DEMKO
SYST 00E. 127762
EEx ia IIC T4
IP 65
-30 ˚C < Ta < +60 ˚C
Ex Applications
Gas analysis plays an important role in many applications.
Many of these require explosion protection of the equipment
exposed to the measuring area. The following are
examples of such applications:
• Petrochemical industry
• Mining industry
• Chemical industry
Installation and Operation
LDS 3000 with CD 3002 Ex is very easy to install and
operate. The analyser is designed to handle the very rough
industrial environment consisting of high temperature,
electromagnetic fields, high dust loads, etc. The system is
composed of four parts.
• The central unit (standard)
• Hybrid cable (standard)
• The Ex-barrier
• The Ex-sensor
The transmitter and the receiver in the sensor are interconnected
with a loop cable and the sensor is connected to
the central unit with a hybrid cable containing fibre optics
and, at the point of entry into the hazardous area, an Exbarrier
for the electrical power. The length of this cable can
exceed 1 km.
Features
The system has a lot of unique points which makes it very
suitable for long term process operation in environments
with Ex requirements.
• Low maintenance
• Intrinsically safe
• No gas sampling - in-situ measurements
• Three measuring points simultaneously. Not all has to
be equipped with CD 3002 Ex - only the ones in the
hazardous area.
References (complete on the web)
Shell Sweden 1998
Refinery • Zone 2 • NH 3 0-25 ppm
Ciba Italy 2000
Chemical • Zone 0 • O 2 0-5%
Contact
Siemens Laser Analytics (headquarters)
Marketing Director
Jan Grimbrandt • jan.grimbrandt@siemens.com
Marketing Assistant
Michaela Hermansson • michaela.hermansson@siemens.com
Phone: +46 (0)31 776 86 00
Siemens Laser Analytics objective is not only to supply gas analysers measuring different gases in complicated
and hostile environments – we also want to participate in managing difficult processes containing
gas compounds by adding know-how, experience and professionallity in every aspect of the measurement.
Siemens Laser Analytics
Siemens Laser Analytics AB • Box 5065 • SE-402 22 Göteborg • Sweden • www.siemens.se/sla