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              齐纳安全栅使用注意事项

              日期:2019-07-02 09:11
               
              1. 齐纳式安全栅应安装在非危险场所,通往现场(危险场所)的软铜导线截面积必须大于0.5mm2。连接导线的绝缘强度应大于500V。
               
              2. 齐纳式安全栅本安端(有蓝色标记)和非本安端电路配线,不得接错和混淆。本安导线宜选用蓝色作为本安标记。本安导线和非本安导线在汇线槽中应分开铺设,采用各自保护套管。齐纳式安全栅的本安侧,不允许混有其它电源,包括其它本安电路的电源。
               
              3. .齐纳式安全栅与一次仪表组成本安安全防爆系统时,必须经国家指定的防爆检验机构检验认可。YB900系列齐纳式安全栅由国家防爆检验中心(CQST ), 给出的Co, Lo分布参数是相对与IIC级(氢气级)的最大允许值,对于IIB级环境可把该参数乘以3,对于IIA级环境可把该参数乘以8。传输线选用不同规格的电缆时,其本身的电缆参数应予高度重视,不得超过规定值。
               
              4. 对齐纳式安全栅进行单独通电调试时,必须注意齐纳式安全栅的型号、电源极性、电压等以及齐纳式安全栅外壳接线端上的标号。
               
              5. 严禁用兆欧表测试齐纳式安全栅端子之间的绝缘性。若要检查系统线路绝缘性时,应先断开全部齐纳式安全栅接线,否则会引起内部器件损坏。
               
              6. 凡与齐纳式安全栅相连接的现场仪表,均应为有关防爆部门进行防爆试验并取得防爆合格证的仪表。
               
              7. 如齐纳式安全栅内部模块损坏需要维修或更换时,原则上应由制造厂承担。用户自行维修时,应按照有关的注意事项,具体方法请按照维修的章节进行(本质安全型仪表的维修仅限于所述的范围进行,其外的维修应与制造厂商量)。经检修后方能重新投入运行,不允许随意更换影响防爆性能的元件或结构。
               
              8. 齐纳式安全栅的安装、使用和维护应严格遵照GB 3836.152000《爆炸性气体环境用电气设备第15部分:危险场所电气安装(煤矿除外)》的有关条款进行。
               
              9. 安全栅应有可靠接地,接地电阻不大于4Ω,接地线电阻不大于1 Ω。

              1. Ziner safety grille should be installed in non-dangerous places. The cross-sectional area of soft copper conductors leading to the site (dangerous places) must be greater than 0.5mm2. The insulation strength of the connecting wire should be greater than 500V.
               
              2. Zener-type safety gate with blue marking and non-intrinsic safety circuit wiring should not be misconnected and confused. Blue should be chosen as intrinsic safety marker for intrinsic safety conductors. The intrinsically safe and non-intrinsically safe conductors should be laid separately in the junction groove and each protective sleeve shall be used. On the intrinsic safety side of Ziner safety gate, other power sources, including other intrinsic safety circuits, are not allowed to be mixed.
               
              3. When the Zener type safety grate and primary instrument constitute the cost-safe explosion-proof system, they must be inspected and approved by the explosion-proof inspection institution designated by the state. YB900 Series Zener Safety Gate is provided by National Explosion-proof Inspection Center (CQST). The distribution parameters of Co and Lo are the maximum allowable values relative to Class IIC (hydrogen level). For Class IIB environment, this parameter can be multiplied by 3, and for Class IIA environment, by 8. When choosing different specifications of cables for transmission lines, their own cable parameters should be highly valued and should not exceed the specified values.
               
              4. When debugging the Ziner Safety Gate separately, attention must be paid to the type of Ziner Safety Gate, the polarity of power supply, voltage and the label on the terminal of the shell of Ziner Safety Gate.
               
              5. It is strictly forbidden to use megawatt-hour meter to test the insulation between the terminals of Ziner safety gate. If we want to check the insulation of the system line, we should first disconnect all Zener type safety gate wiring, otherwise it will cause internal device damage.
               
              6. All field instruments connected with Ziner safety grate shall conduct explosion-proof tests for the relevant explosion-proof departments and obtain explosion-proof certificates.
               
              7. In principle, the manufacturer shall bear the damage of the internal module of Ziner safety grille when it needs to be repaired or replaced. When the user repairs himself, he should follow the relevant precautions, and the specific method should be carried out according to the chapter of maintenance (the maintenance of intrinsically safe instruments is limited to the scope mentioned, and the maintenance outside should be carried out with the manufacturer's quantity). It is not allowed to replace the components or structures that affect the explosion-proof performance at will.
               
              8. The installation, use and maintenance of Ziner safety grille shall strictly comply with the relevant provisions of GB 3836.152000 "Electrical equipment for explosive gas environment Part 15: Electrical installation in dangerous places (except coal mines)".
               
              9. Safety grids should be grounded reliably. The grounding resistance should not exceed 4 and the grounding wire resistance should not exceed 1.

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