Bytorent: How to achieve Intrinsic Safety through Safety Control (Part 1)

When it comes to intrinsic safety, security control system is one of the topics that cannot be sidewalked.

The safety control system is the center of the machine, which controls and monitors all the input and output links of the entire machine and equipment, and ensures the normal operation of the system, which can avoid the unsafe state of the relevant equipment to the maximum extent, prevent the occurrence of malignant accidents or reduce losses as much as possible after the accident, and protect the production equipment and the most important personal safety.

The meaning of intrinsically safe

Intrinsic safety refers to the function that the production equipment or production system itself is safe through design and other means, and will not cause accidents in the case of misoperation or failure.

The intrinsic security includes the intrinsic security of equipment and the intrinsic security of people. In the field of industrial control safety, the essential safety of equipment and the essential safety of people need to be combined, and it is far from enough to rely entirely on the essential safety of equipment, and it is even less advisable to rely solely on the essential safety of people.

The essential safety measures of the equipment can be realized through the safety design of the equipment itself and the controller.

Intrinsically safe purposes

The purpose of intrinsic safety is to use modern science and technology to fundamentally eliminate the main conditions that can cause accidents. If the fundamental level cannot be reached, two or more related security measures or equipment can be taken to form a combined security system to achieve maximum security.

Choose the right product to easily achieve intrinsic safety

1. The basic entry point of intrinsic security

(1) Reduce the frequency or time of exposure of equipment/people to hazards;

(2) Reduce the severity of equipment/human hazard injury;

(3) Improve the possibility of equipment/people avoiding hazards.

2. Measures that can be taken for intrinsic security

(1) Adopt reliability design to improve the reliability of mechanical equipment;

(2) The use of safety control devices, when the danger occurs, the use of safety control devices to reduce the severity of injury and the possibility of danger;

Product safety standard

Functional safety controller and sensor, up to PLe/SiL3 safety performance level, in line with Chinese and global standards.

So what is the safety level? How to judge the level of safety performance?

First of all, Xiaobian needs to explain here:

In the latest risk assessment method, the five stages of "a" to "e" are used to evaluate system safety.

· Safety control requires a performance level called PLr

· The safety control performance evaluation level is called PL

It can be seen from the above table that the average dangerous failure probability of PLa to PLe per hour is getting smaller and smaller, that is to say, PLa has the lowest performance grade and the worst safety; PLe has the highest performance level and the best security.

Tner, Quanta series of safety relays, whether TNER-A31, Quanta DN1820, DN11xx, PL performance levels are up to PLe.

Other features

· Can be used to connect various safety components, such as emergency stop, door lock, contact side, etc.;

· Real-time monitoring of equipment safety operation and personnel compliance;

· Form an independent safety monitoring system outside the functional system of the equipment;

· Prevent harmful actions caused by illegal operation, poor contact and aging of equipment, and timely protect the safety of equipment and personnel.

(3) Use safety protection devices. When the risk factor cannot be eliminated, the use of safety protection devices to isolate the risk factor is the most commonly used technical measure. For details, see the second and third sections.

(4) Using sensing technology. Photoelectric, induction, pressure sensing sensors are set in the dangerous area, and when people enter the dangerous area, they can immediately stop and terminate the dangerous movement.

(5) Install safety devices. The function of the safety device is slightly different from that of the protective device. It can automatically control and eliminate or weaken the above dangers when the equipment produces overpressure, overtemperature, overspeed and other dangerous factors. Safety valves, speed limiters, limit switches, fuses and so on are common safety devices;

(6) The use of self-monitoring, alarm and processing systems. On-line monitoring and fault diagnosis of operating equipment status parameters with modern instruments;

(7) Adopt multiple security measures. For dangerous operations, the equipment must be absolutely safe and reliable.

All in all, the essential safety of the equipment is inseparable from the assistance of the mechanical safety control system, in addition to the safety control device to reduce the severity of the danger, you can also use safety protection devices, sensing technology, safety devices and other methods.

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