Safety Barriers

I. Overview

● The LU-AB22 safety barrier converts DC signals into isolated standard process signals and limits hazardous energy from entering the hazardous location through the intrinsically safe terminals.

● Two independent input and output channels; for each channel, the input, output and power supply are magnetically isolated from one another.

II. Technical parameters

●Hazardous area signals

Channel 1:

For current input  Input range: 4~20mA, 0-20mA, 0-10mA

            Distribution voltage: ≥16VDC

            Input resistance: built-in input resistor 50Ω

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

Input impedance: ≥500KΩ

Channel 2:

For current output  Output range: 4~20mA

Permissible load: ≤750Ω

●Safe area signals

Channel 1:

For current output  Output range: 4~20mA, 0-20mA, 0-10mA

Permissible load: ≤350Ω

For voltage output  Output range: 1~5V, 0-5V, 0-10V

Output impedance: ≤500Ω

Channel 2:

For current input  Input range: 4~20mA

Input resistance: 50Ω

●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. 5W 

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