Brand: Bently Nevada

P/ n:3500/94

Description:VGA display unit

Origin: United States

Xiamen Xiongba provides 3500/40M DCS/PLC, Xiamen Xiongba Shan Ni for your quotation, and provide one-year warranty service.

3500/94 high quality affordable models.

 

Xiamen Xiongba Electronic Commerce Co., LTD. (Zhangzhou Branch)
Unit 2009, Creative Center, 1733 Luling Road, Siming District, Xiamen, China
M: + 86 18059884797
Email :sales@xiongbagk.cn
Website:www.sauldcs.com/www.xiongbagk.cn

Safety fence is a device used in intrinsically safe explosion-proof system to isolate field instruments and meters. For explosion protection system and explosion proof electrical apparatus, this type of safety barrier Ann application in the design of safety explosion protection system, it is installed on the safety and contain the Ann circuit and the circuit of the device, circuit through the limit of the flow and pressure limiting circuit limits the energy of sent to the scene in the loop, thereby preventing the series with the danger of the Ann circuit energy in the circuit, It is called associated equipment in intrinsically safe explosion-proof system and is an important part of intrinsically safe system.

Installation position

The safety fence is installed in the safe place, receives the signal from the danger area, outputs the safety signal to the safe area or the danger area.

Matters needing attention

1. The safety grid shall be installed in a safe place, and the environmental conditions shall meet the requirements of the “service conditions” in the “Safety Grid Selection Sample”.

2. The connecting wires of the intrinsically safe end (blue end) and non-intrinsically safe end circuits of the isolated safety gate should be laid separately in the trough of the sink line, respectively using independent protective bushing. No other power cords are allowed in the distribution pipes of the intrinsically safe side, including those used by its intrinsically safe circuit.

3, the lead to the dangerous place should be selected with blue mark of intrinsic safety wire, wire soft copper area must be greater than 0.5mm2, insulation strength should be greater than 500V.

4. Before commissioning the isolated safety grid, it is necessary to pay attention to whether the type, wiring method and line polarity of the isolated safety grid meet the requirements of the design and product, otherwise it may cause injury to people and equipment.

5. It is forbidden to test the insulation strength between isolated safety gate terminals with megohm meter. If you want to check the insulation strength of the system, you should first disconnect all the connections of the isolated safety gate, otherwise it may cause damage to the internal circuit of the safety gate.

6. Before programming the safety gate on site, all wiring must be disconnected and then connected to the programmer, and then power programming, otherwise it may cause adverse consequences.

7, and the isolated safety gate connected with the field instrument, should be adopted by the relevant explosion-proof inspection department identified by the state explosion-proof test, and obtain explosion-proof certificate of the instrument.

8. In the design, installation, use and maintenance of isolated safety barrier, the instructions in the product manual and GB3836.15-2000 Electrical equipment for Explosive gas environment Part 15 should be observed at the same time. Electrical Installation in Dangerous Places (EXCEPT coal mines) “and GB50058-1992 Code for Design of Electric Power Setting in Explosion and Fire Dangerous Environments.

The role of the safety fence

1. Because the three-way isolation mode is adopted, the system grounding line is not required, which brings great convenience to the design and site construction.

2. The requirement of the instrument in the danger area is greatly reduced, and there is no need to use the isolated instrument on site.

3. Because the signal line does not need to be common ground, the stability and anti-interference ability of the detection and control loop signal are greatly enhanced, so as to improve the reliability of the whole system.

4. Isolated safety gate has stronger input signal processing ability, can accept and process thermocouple, thermal resistance, frequency and other signals.