Safety Barriers

I. Overview

● The LU-B11 safety barrier can be connected to a variety of DC signals of less than 20mA or less than 10V.

● Receives DC voltage signals from DCS/PLC systems or other operators located in the safe area, transmits them isolated through the safety barrier, and outputs the required DC current or voltage signal to drive intrinsically safe instruments in the hazardous field, such as electro-pneumatic converters, valve positioners and display devices.

● Powered by an independent power supply, with isolation between power supply, input and output.

II. Technical specifications

● Input parameters (safe-area signal)

For current input  Input range: 4~20mA

            Input resistance: built-in input resistor 100Ω

For voltage input  Input range: 1~5V, 0-5V, 0-10V

            Input resistance: >500KΩ

● Output parameters (hazardous-area signal)

For current output  Output range: 4~20mA

             Permissible load: ≤750Ω

For voltage output  Output range: 1~5V

             Built-in resistor: 250Ω

             Output impedance: ≤500Ω

● Intrinsic safety parameters

Explosion-proof marking:      [Exia]ⅡC

Maximum voltage Um:    250V    

Maximum output voltage Uo: 28V

Maximum output current Io: 93mA

Maximum external inductance Lo: 2.4mH

Maximum external capacitance Co: 0.05μF

● Ambient parameters

Power sup ply: 20-30VDC

Ripple factor below 10%P-P, approx. 1W 

Power indicator lamp: green LED, lit when the power is supplied

Operating temperature range: -20~ +60°C

Operating humidity range: 0 ~ 95%RH (non-condensing)

● General technical parameters

Standard accuracy: ±0.1%

Temperature drift: ±0.015%/°C

Response time: ≤10mS

Insulation resistance: 2.5KV, 1min, 50HZ between input, output and power supply

Isolation strength: input-output-power supply ≥100MΩ/500VDC

Effect of load resistance variation: ±0.1%/250Ω (for current output)

                   ±0.1% (for voltage output)

Power-on stabilization time: ≤3s