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適用范圍
1 區、2 區危險氣體場所；
IIA、IIB、IIC 類T1～T4 組性氣體或蒸氣環境；
戶內、戶外(IP54,*IP65)。
Applying scope
Hazardous gas areas: Zone 1&2 ;
Explosive gas or vapor atmospheres:class IIA、IIB、IIC,
temperature class: T1～T4;
Indoor and outdoor(IP54,*IP65).
防爆原理
將普通電器元件裝入一個充滿保護氣體的主腔內，保證主
腔內部保護氣體的壓力高于外部環境氣體，以免性混
合物進入主腔，或保證足量的保護氣體通過使內部的
性混合物的濃度降至下限以下，從而達到防爆的目的。
Explosion-protected principle
Put normal equipment components into a main chamber which
is filled with protective gas to ensure the pressure of the inner
protective gas is higher than the outer to pretect explosive mixture
from entering main chamber, or to ensure enough quantity
of protective gas so that the consistency of explosive mixture is
below the explosion limit to achieve the aim of explosion protection.
產品特色
采用主、副盤(柜、箱)結構，主盤為正壓腔，內裝各種規
格普通的電器元件和防爆必須的通風布氣系統、檢壓傳
感系統、氣壓調節系統等；副盤內裝防爆壓力顯示系統、
防爆換氣自控系統、防爆報警系統、防爆電源自切換系
統、進出氣源連接口、外部的進出電纜密封裝置等 ；
正壓腔內可安裝各種普通的檢測儀表、分析儀表、顯示儀
表、監視器、微電腦觸摸屏、大功率變頻器等，內裝電器
元件基本不受限制 ；
外殼采用優質碳鋼或不銹鋼板焊接成型，表面高壓靜電
噴塑；
結構形式可為盤式、柜式、箱式、操作臺式；
按進氣方式可分為正壓通風型和正壓補償型 ；
正壓通風型為不間斷連續供氣，正壓腔內電器元件的工
作熱量可隨時帶走，具有良好的散熱功能 ；
正壓補償型為間斷性供氣，正壓腔具有良好的保壓密封
性能 ；
用戶須自給氣源( 凈化空氣或氮氣) ，氣源壓力為
0.4MPa～0.8MPa；通常現場的儀表氣源可滿足要求。
Features
It adopts the structure of main switchboard and assistant switchboard.
Main switchboard is the pressurized chamber, inside installed
the normal components and the needed ventilating system,
sense system and air pressure adjustment system; the inside
of assistant switchboard installed explosion-protected displaying
system, gas exchanging autocontrol system, alarming system,
power autoswitch system, in and out gas source joint and the
exterior in and out cable sealing device;
The pressurized chamber is able to install various common check
meters, analysis meter, display meter, monitor, microcomputer
feeling screen, high-power transducer and so on. The inside installed
components are normally without limit;
The shell adopts moulded high-quality carbon steel or stainless
steel with pressurized static plastic-sprayed surface;
The structure form includes meter panel、tank、box and operation
platform;
There are pressurized ventilation and pressurized compensation
entering types.
Pressurized ventilation type is of continuous air feed, and the
heat of the components in general cavity can be sent out which
provides good heat-disfusing function;
Pressurized compensation type is of discontinuous air feed, and it
has good pressure guarantee and sealing function;
The user must supply gas source (clean air or nitrogen gas),the
gas pressure is 0.4MPa～0.8Mpa; usual gas source is available
主要技術參數：
1、防爆標志：Ex pdemIIBT4或pdemIICT6；
2、防護等級：IP54（*IP65)；
3、副盤（柜、箱內供電：AC220/230V，50Hz～60Hz，10A；
4、輸入氣源壓力為：0.4MPa～0.8MPa，凈化空氣或氮氣等保護氣體；
5、進氣口：G1／2
6、換氣量：10～20m3/h
7、換氣時間：10～30min(由防爆檢測單位確定，Tp=5×V/Q Tp：換氣時間；V：主腔內凈容量，Q：保護氣體流量；
8、耗氣量：2～8m3/h
9、功能指標：
a、儀表電器供電前，按啟動按鈕對主盤（柜、箱）內剩余空氣進行自動換氣，換氣結束自動維持正壓值為150Pa≤P＜350Pa，此時可向正壓柜主腔內電器供電；
b、內部正壓值P≥350Pa時,自動系統自動關閉進氣或開啟排氣閥；
c、內部正壓值P＜150Pa時,自動補氣；
d、內部正壓值P＜80Pa時,自動聲光報警；
e、內部正壓值P＜50Pa時,自動切斷電源。
執行標準
GB3836.1-2000、GB3836.2-2000、GB3836.3-2000、GB3836.5-2004、GB3836.9-200× |
