Safety Barriers

I. Overview

●The LU-AK22 safety barrier receives switch contact or proximity sensor signals from the hazardous area, isolates them through the safety barrier,  and transmits them to the control system or other combined instruments in the safe area by relay contact (level signal or transistor) output.

●The isolating safety barrier is powered by an independent DC power supply, with isolation between power supply, input and output.

II. Technical specifications

● Input parameters (hazardous area signals)

◆Input type:

The passive input is a pure switch contact; the NAMUR type is a proximity sensor conforming to the DIN19234 standard.

          Active signal: when the input signal is > 2.1mA, it is indicated as “ON”

          When the input signal is < 1.2mA, it is indicated as “OFF”

Open-circuit voltage: 8V±0.5V      Short-circuit current: approx. 4mA

Switching threshold: approx. 1.55mA     Hysteresis: 0.2~0.4 mA

●Output parameters (safe area signals) 

◆Output type:

A.  Relay contact: single-pole changeover relay

    Contact rating: 24VDC, 2A ; Load type: resistive load; Response time: ≤10ms

B.  Level signal: high level 4.5V ~ 5.5V ; low level ≤0.5V ; high-level drive capability≤20mA

C. Transistor: external supply voltage ≤40V;        drive output current≤40mA

   Transistor collector output    High level: VCC; Low level: ≤2.5V   

   Transistor emitter output    High level: VCC -2.5V; Low level:≤ 0.5V

● Intrinsic safety parameters

Explosion-proof marking: [Exia] ⅡC

  Maximum permissible voltage Um: 250V

  Maximum open-circuit voltage Uo: 11V

Maximum short-circuit current Io: 15mA

Maximum external inductance Lo: 10mH

Maximum external capacitance Co: 1.4μF

Ambient parameters

Power sup ply: DC24V±10%

Current consumption (with 24VDC power supply): <50mA

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

Output indicator lamp: yellow LED, contact status indication; OUT1 indicates the first output, OUT2 indicates the second output

“OUT” lamp on: indicates that the contact is in the closed state

“OUT” lamp on: indicates that the contact is in the open state

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

Power-on stabilization time: ≤3s