Installation of Ex isolation modules / Ex i isolation amplifiers
The mounting rail in the analyzer has a length of approximately 250 mm, with the number of installable components being limited.
The maximum installation height is approximately 95 mm; however, it is less in the area of the display (88 mm). The width must not exceed 80 mm.
The add-on devices must be approved for an ambient temperature of up to 60 °C; this temperature can be reached under extreme marginal conditions.
The label of the analyzer shows all types of explosion protection that the device itself and the components can have.
Installation must always be discussed with the competent experts.
Slots in the analyzer and the purging unit.
Ex i isolating transformer
Ex isolating relay 8S
Comment
Analyzers
2
2
Max. 2
Bartec purging unit
0
1
Max. 1
Ex i isolating transformer, 7MB8000-3AB
The analog inputs and outputs of the analyzers are not intrinsically safe in the basic version.
The analog output can be supplemented later with an intrinsically-safe analog output (explosion protection type Ex ib II C or EE ia II C). For this purpose, a suitable commercially available isolating transformer can be mounted on a rail in the device.
Technical specifications
Intrinsically-safe analog output
mA isolating transformer without power supply
For installing in the analyzer
Ex i isolating transformer, rail mounting
Intrinsically-safe output Ex ia IIC
Galvanic isolation
Technical specifications
Input voltage Uin
? 31.2 V
Auxiliary power
Without
Weight
160 g
Ambient temperature
-20 °C … +70 °C
Relative humidity
< 95%, no condensation
Explosion protection
Type of protection
II 3 (1) G Ex nA [ia] IIC T4 and E II (1) D [Ex iaD]
EC type-examination certificate
BVS 04 ATEX E 082 X
Safety limits
U0 ? 18.8 V
I0 ? 107 mA
P0 ? 503 mW
Isolating relay (signal outputs with external voltage supply) 7MB8000-4AA/-4AB
If the device has to be opened, it must be isolated at all poles from the mains cable, the digital inputs, relay outputs, analog inputs/ outputs, RS485 interface cable, and the PROFIBUS PA cables (not Ex i). For this purpose, isolating relays must be inserted. Intrinsically-safe circuits are excepted from this.
An isolating relay must be explosion-proof if it is to be set up in an area subject to explosion hazard.
Protective gas
The fed-in gases are not flammable. Air from an area not subject to explosion hazard can be used as the protective gas (purging gas).
Flammable gases or gas mixtures that are rarely or only briefly ignitable are fed in. The enclosure must be flooded with inert gas.
Gas mixtures that are occasionally ignitable are introduced. As with b), the enclosure must be flooded with inert gas; in addition, the sample gas inlet and outlet must be equipped with flame arrestors.
Explosive gas mixtures that are present in the long term or permanently must not be connected!
Flame arrestors
If the gas mixture to be measured sometimes has an explosive composition, flame arrestors must be installed in the sample gas inlet and, in certain circumstances, also in the sample gas outlet, in addition to the application already described with flammable sample gases.
The material of the flame arrestors must be resistant to the flow-type sample gas mixture. For this reason, they are available in two different versions:
The detonation protection (Ex designation Ex IIG IIC) is used to prevent flashover in the case of unstable detonations and deflagrations of explosive gas or vapor/air mixtures of explosion group IIC.
The flame arrestor consists essentially of a detonation-proof enclosure with gas connections and a ceramic sinter cartridge built into the housing (max. pore width: 80 µm) to prevent flashover.
It may be heated up to 150 °C and subjected to a pressure up to 3 bar (abs.).
Technical specifications
Length
83.5 mm
Diameter
32 mm
External thread
M 30 x 1.5; 30 mm long
Gas connections
G 1/4"
Material
Stainless steel or Hastelloy C
Max. gas operating pressure
3 bar (abs.)
Max. operating temperature
150 °C (200 °C on request)
Explosion group
IIC
Differential pressure switch: 7MB8000-5AA
There must be a fail-safe guarantee that the sample gas pressure will never exceed 5 hPa under the purging gas pressure.
If this cannot be guaranteed on the plant side, a differential pressure switch must be mounted between the sample gas line and the purging gas line and connected electrically with the purging unit.
The differential pressure switch always has contact with the sample gas.
Technical specifications
Differential pressure switches type 732.51 with magnetic spring contact type 821
Materials coming into contact with the sample gas: 1.4571
Measuring range: -20 ... +20 hPa
Trigger point: Adjustable
skener.ru
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Арматура DENDOR
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Датчики и измерители
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Регуляторы и регистраторы
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Пневматическое оборудование
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Краны и Клапаны
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Измерительные приборы
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Системы беспроводного управления «умный дом»
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Бесконтактные выключатели Конечные выключатели Оптические датчики Энкодеры
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SKW-FS - Установка умягчения
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SKW-FK - Установка обезжелезивания