Safety barriers, also known as safety limiters, are an important component of intrinsic safety systems.

There are two main types of safety barriers: Zener safety barriers and isolation safety barriers.

The core components of a Zener safety barrier are Zener diodes, current limiting resistors, and fast melting wires.

The isolated safety barrier not only has the function of limiting current, but also has the function of isolation. It mainly consists of a circuit energy limiting unit, a signal and power isolation unit, and a signal processing unit.

The main function of a safety barrier is to limit current and voltage, ensuring that the energy available to on-site instruments is within a safe range.

FBE041-POne in one out distribution safety barrier | Guangzhou isolatoroverview

On site power distribution signal input isolated safety barrier provides isolated intrinsic safety power voltage to transmitters in hazardous areas, and isolates and converts the 4mA~20mA signal generated by the transmitter before transmitting it to the safety zone control system or other intelligent instruments.
This isolated safety barrier requires independent power supply, with electromagnetic isolation between the power supply input circuit output circuit.
Characteristics
Provide a distribution voltage of 16.5V to 28V to the transmitter.
Isolate and transmit the 4mA to 20mA signal of the transmitter.
You can choose 4mA~20mA or 1V~5 output, or other required DC signals. Modular watch core design, no need for zero and full adjustment.
Equipped with a working power indicator light.
[Exia]IICInput circuit overcurrent protection.

FBE041-POne in one out distribution safety barrier | Guangzhou isolatorProduct Application

1. Provide distribution voltage to the on-site transmitter and isolate and convert the input signal.
2. Devices connected to the site: two-wire or three wire transmitters.
3. Location of on-site equipment: Zone 0, Zone 1, Zone 2; IIA zone, IIB zone, IIC zone; T4 to T6 danger zone.
4. The safety barrier is connected to the control system (or other unit combination instruments): The AI card of each DCS/PLC receives current or voltage signals.

FBE044 - I - II

PRODUCT MODEL
Input channel (Ex) input signal
4mA～20mA……………………………………… P
Output channel signal output
4mA～20mA…………… A… 1V～5V…………… 1
0mA～20mA…………… B… 0V～5V…………… 2
0mA～10mA…………… C… 0V～10V… ……… 3
Current range... Z... Voltage range... 9

Example of Selection

Input: transmitter 4mA~20mA Output: 4mA~20mA
The ordering code is:FBE041-PA