Siemens ULTRAMAT 6F Руководство по эксплуатации - Страница 7
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2.2.1
Overpressure monitoring
You must connect an appropriate purging unit in the case of analyzers with type of protection "Pressurized enclosure Ex px
or Ex pz". This purging unit ensures that the overpressure is monitored reliably and that the volume flow is monitored fail-
safe (redundant).
If an analyzer is used with type of protection "Pressurized enclosure Ex pz" in Zone 2, you must provide a purging unit with
type of protection "Ex px" when connecting combustible or occasionally explosive sample gases.
2.2.2
External explosion protection
Overview
The external explosion protection serves to prevent penetration of explosive gas mixtures (gas damp) into the enclosure or
ignition on the surface. For this reason, the analyzer is purged with protective gas and - with category 2 devices (Ex zone 1)
- the control panel additionally operated via an intrinsically-safe isolating component.
2.2.2.1
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 enclosure is purged with 5 times its own volume.
2.2.2.2
Operating phase
The pre-purging phase is followed by the operating phase:
● Ex px with leakage compensation; only the volume of protective gas required to hold an overpressure of at least 50 Pa
(recommended 5 hPa) compared to the atmosphere
● In Ex px or Ex pz mode with continuous purging, the protective gas flows through the enclosure at ≥ 1 l/min. An
overpressure of at least 50 Pa (recommended 5 hPa) compared to the atmosphere 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.
2.2.3
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 arrestors can be omitted. However, it must be guaranteed that the sample gas in the CS always remains below
the lower explosive limit!
● Occasionally explosive sample gases:
These may only be introduced into the CALOMAT 6F/CALOMAT 62F and OXYMAT 6F gas analyzers if the inlets and
outlets for sample gas and reference gas have each been provided with a flame arrestor. The flame arrestors must meet
the safety requirements for the combustible medium.
The following applies to the reference gas path of the OXYMAT 6F:
A flame arrestor can be omitted at the reference gas inlet if it is guaranteed that the
reference gas is introduced before the analyzer is switched on and that the reference gas pressure is monitored
continuously.
The ULTRAMAT 6F analyzer may also be operated without flame arrestors.
● Gas mixtures that are frequently or always explosive:
These must not be introduced!
● Sample gases above the upper explosive limit:
These must be individually assessed in accordance with a separate certificate based on on-site acceptance testing using
inert gas as the protective gas.
Compact Operating Instructions in accordance with EN 61010-1 and EN 60079-0
A5E45779389002-01, 09/2018
and
the sample gas is added.
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