Table of Contents
Advertisement
1.
Description
1.1
Application range
The C 6F, O 6F and U 6F analyzers are used to measure individual components in gas mixtures. In
conjunction with a certified EEx p safety device guaranteeing the pressurized enclosure, these
analyzers can be used in hazardous areas of zone 1. The EEx p safety device guarantees defined
pre-purging in the housing, and also the required pressurized enclosure during operation.
Two alternatives are possible for the pressurized enclosure EEx p, and can be considered as
equivalent:
- Pressurized enclosure EEx p with "Compensation of losses resulting from leaks" and
- Pressurized enclosure EEx p with "Continuous purging".
The analyzer version can be recognized by the bold printed digit in the Order No.:
Pressurized enclosure EEx p
CALOMAT 6F
OXYMAT 6F
ULTRAMAT 6F
1.2
External explosion protection
The "External explosion protection" serves to prevent penetration of explosive gas mixtures (gas
damp) into the housing or ignition on the surface. For this reason, the analyzer is purged with
protective gas, and the control panel operated via an intrinsically-safe isolating component.
1.2.1
Pre-purging phase
The pre-purging phase serves to displace any combustible gases present prior to switching on the
analyzer. During this time (5 min), the housing is purged with 5 times its own volume.
1.2.2
Operating phase
The pre-purging phase is followed by the operating phase:
- In EEx p mode with "Compensation of losses resulting from leaks", only that volume of
protective gas required to hold an overpressure of ≥ ≥ ≥ ≥ 50 Pa compared to atmospheric and the sample
gas is added.
- In EEx p mode with "Continuous purging", the protective gas flows through the housing at
≥ ≥ ≥ ≥ 1 l/min. An overpressure of ≥ ≥ ≥ ≥ 50 Pa compared to atmospheric is built up at the same time.
Either inert gas (e.g. nitrogen) or air must be used as the protective gas depending on the sample gas
composition. Dissipation of the protective gas into the Ex zone is only permissible with spark
protection and a particle barrier.
1.3
Internal explosion protection
Internal explosion protection refers to the sample gas path (containment system CS) in the analyzer
and to the ignition protection of the process gas. A differentiation must be made between the following
cases:
- Non-combustible sample gases and gas mixtures below the LEL: flame inhibitors can be
omitted. However, it must be guaranteed that the sample gas in the CS always remains below the
lower explosive limit!
- Sample gases which are seldom combustible and only for a brief period: flame inhibitors can be
omitted.
- Occasionally explosive sample gases: these may only be connected to the C 6F and O 6F gas
analyzers if both the sample gas inlet and outlet are provided with a flame inhibitor. The U 6F
analyzer may also be used without flame inhibitors.
The flame inhibitors must meet the safety requirements for the combustible medium.
- Frequently or permanently explosive gas mixtures: these must not be connected!
- Sample gases above the upper explosive limit: these must be assessed individually according to
separate certification for use of an inert gas as the protective gas.
Additional Equipment Manual EEx p
Order No.:
A5E 000
58873-02
With "Compensation of losses
resulting from leaks"
7MB251x–xxx0x–xAEx
7MB201x–xxxxx–2or3xxx
7MB211x–xxxxx–2or3xxx
With "Continuous purging"
7MB251x–xxx0x–xAFx
7MB201x–xxxxx–6or7xxx
7MB211x–xxxxx–6or7xxx
English
E-3
Hide quick links:
Advertisement
Table of Contents
