P+F times plus safety barrier application advantages description

What are the application advantages of the German P+F safety barrier?
P+F safety barrier, Germany P+F has a proximity switch, P+F proximity sensor, Germany P+F times plus safety barriers are as follows:
P+F safety barrier, also known as safety limiter, is an important part of the intrinsically safe system.
The core components of the P+F barrier are Zener diodes, current limiting resistors and fast fuses.
The main function of the P+F safety barrier is the current limiting voltage limit, which ensures that the energy available in the field instrument is within the safe range.
The P+F safety barrier is also known as a safety retainer. The safety interface of the intrinsically safe circuit can transmit electrical signals bidirectionally between the safety zone and the danger zone, and can limit the safety zone to the danger zone and energy transfer caused by the fault. The general safety barrier is Zener and isolated.
P+F intrinsically safe safety barrier is used in the design of intrinsically safe explosion-proof system. It is installed in a safe place and contains intrinsically safe circuit and non-intrinsically safe circuit. The circuit is limited to the current limit and voltage limiting circuit. The energy of the intrinsically safe circuit in the field, so as to prevent the dangerous energy of the non-intrinsically safe circuit from entering the intrinsically safe circuit, it is called the associated equipment in the intrinsically safe explosion-proof system and is an important part of the intrinsically safe system.
P+F intrinsically safe explosion-proof system related equipment refers to the connected electrical equipment installed between the intrinsically safe electrical equipment and the non-intrinsically safe electrical equipment.
Since the barrier is designed as an energy-limited interface between the field device and the control room device, the barrier ensures that the energy delivered to the field device is intrinsically safe, regardless of whether the control room device is in a normal or fault condition. of.
P+F barrier application advantages
1 P+F isolated safety barrier is more expensive than Zener safety barrier, but its many advantages and features still bring a lot of convenience to users, so that more and more users prefer the isolated safety barrier. .
2 Using the P+F isolated safety barrier, the field loop signal in the danger zone and the safety zone loop signal can be effectively isolated. In this way, the intrinsically safe automatic control system does not require an intrinsically safe grounding system, which simplifies the construction of the intrinsically safe explosion-proof system.
3 The use of P+F isolated safety barrier greatly enhances the anti-jamming capability of the detection and control loops and improves system reliability.
4 Use P+F isolated safety barrier to allow field instrument grounding, allowing field instruments to be non-isolated.
5 P+F isolated safety barriers have many protection function circuits, which are less likely to be accidentally damaged, allowing on-site instrumentation to be overhauled, which can shorten the project preparation time and reduce the parking time.
The 6P+F isolated safety barrier has strong signal processing capability. Such as digital input state control, mV, Pt100 become 4 ~ 20mA and so on. This provides greater convenience, rationality, and effectiveness for the application of field instruments and control systems.
7 When the user applies DCS and ESD at the same time, the safety barrier with one input and two exits can effectively isolate the two systems to avoid mutual influence between the systems.
The 8-loop power supply P+F isolated safety barrier not only maintains the advantages of the active isolated safety barrier, but also has the same convenience as the Zener safety barrier. It does not require another 24V power supply, and is especially suitable for direct power supply with I/O cards. DCS system.
The P+F barrier is a limited-energy circuit between the field device and the control room equipment. It is used to limit the electric energy supplied by the control room to the field instrument to neither generate enough sparks to detonate dangerous gases nor generate enough to detonate. The surface temperature of the instrument for hazardous gases eliminates the source of the detonation. When selecting a P+F barrier, the model must be considered to be compatible with the type of field instrument. It is also necessary to consider the compatibility of the P+F barrier with the intrinsically safe instrumentation and the problem of impedance matching in the intrinsically safe system. China adopts the "loop certification" method to certify the intrinsically safe system, that is, according to the joint forensics of the use of instruments in hazardous environments, select the P+F safety barrier that has been jointly certified by the company, and once the joint evidence is obtained, the field instrument and the P+F safety barrier will be used. The fixed combination constitutes an intrinsically safe system. In practice, this approach has significant limitations on the choice of P+F barriers and field instruments. Widespread adoption is an intrinsic safety certification technology that has gradually formed in the past years, namely “parameter certification”.