Schischek EXL-IRU-1

Product Brief Introduction

Core Technical Specifications

• Module Operating Power Supply: 24 V AC / DC dual universal power input
• Intrinsic Safe Input Circuit: Supports 1 channel passive potential-free binary contact ExSens sensor (hazardous zone installation)
• Output Contact Type: Safe-area side potential-free relay contact, rated load 250V AC / 3A
• Integrated Timing Relay Adjustment Range: 0.1s ~ 300s continuous delay setting
• Explosion Protection Certification: ATEX Ex ia intrinsic safety, applicable Zone 1, 2 gas hazardous areas; Zone 21, 22 dust hazardous areas
• Module Protection Grade: IP20 (safe cabinet installation only)
• Mounting Standard: 35mm standard DIN rail snap mounting
• Module Dimensions: 90mm × 60mm × 22.5mm
• Net Weight: 0.12 kg
• Operating Ambient Temperature: 0°C ~ +55°C
• Intrinsic Safe Circuit Maximum Energy: Limited below ignition threshold of explosive gas mixtures

Function Features

1. Complete electrical isolation between hazardous zone Ex-i input circuit and safe-area output circuit, prevents high-energy circuit spark igniting explosive medium
2. Adjustable built-in timing relay, configurable for delay-on-make or delay-on-break output logic
3. Two independent LED status indicators: input sensor signal status, relay output action status
4. Passive contact input design, no power supply required for field hazardous zone sensors
5. Compatible with full range Schischek ExSens binary sensors: explosion-proof thermostat, differential pressure switch, liquid flow switch, fan belt breakage sensor
6. Compact single-width DIN rail module design, multiple modules side-by-side installation without extra heat dissipation space
7. Light blue dedicated intrinsic safe circuit terminal marking, clear wiring differentiation from ordinary control circuits

Performance Parameters

• Electrical Isolation Voltage Between Ex-i Circuit & Safe Circuit: 2000V AC
• Timing Delay Setting Accuracy: ± 2% full scale
• Relay Contact Mechanical Service Life: ≥ 500,000 switching cycles
• Intrinsic Safe Circuit Cable Maximum Length: 500 meters with certified light blue Ex-i cable

Material Composition

• Module Housing: Self-extinguishing PA66 flame retardant plastic, anti-static surface treatment
• Isolation Component: Epoxy encapsulated intrinsic safety isolation transformer
• Timing Circuit: Industrial-grade low-power solid-state timing chip
• Terminal Blocks: Spring-clamp anti-vibration copper alloy wiring terminals

Structural Characteristics

• Single-width DIN rail snap-on structure, quick installation without fixing screws
• Front panel integrated time adjustment potentiometer, two signal status LED indicator windows
• Separate terminal area partition: left side Ex-i hazardous circuit terminals, right side safe-area power/output terminals, physical isolation barrier between two zones
• Internal epoxy sealed isolation unit, eliminates circuit cross-leakage energy risk

Working Principle

Advantage Highlights

1. ATEX full certification for gas and dust hazardous zones, single module covers multiple explosion classification applications
2. Integrated timing relay eliminates need for separate external timing modules, reduces cabinet component quantity
3. Passive sensor input design reduces wiring power supply layout in dangerous areas, lowers explosion risk points
4. Ultra-narrow DIN rail width saves control cabinet installation space for multi-point hazardous area monitoring systems
5. Spring-clamp wiring terminals resist vibration, suitable for petrochemical and offshore platform vibration environment

Applicable Industries

Installation Requirements

1. Module must be installed entirely inside non-hazardous safe-area control cabinet, cannot mount in Zone 0/1/21/22 classified hazardous locations
2. Hazardous zone Ex-i sensor wiring must use light blue intrinsically safe certified cable, separated ≥ 50mm from non-intrinsic safe power cables
3. DIN rail mounting vertical orientation only, inclination angle deviation ≤ 30°
4. Cabinet internal ambient humidity controlled below 90% RH non-condensing
5. All Ex-i circuit wiring must comply with local ATEX intrinsic safety wiring construction standards

Usage Precautions

1. Never connect non-intrinsic safe power supply or high-energy signals to Ex-i input terminals, will invalidate explosion-proof certification
2. Do not modify internal circuit structure or replace isolation components with non-original spare parts
3. Calibrate timing delay potentiometer only when module power supply is cut off
4. If sensor signal LED keeps extinguished, inspect hazardous zone contact sensor wire open circuit first
5. Do not install module within 20cm of high-power contactors or frequency converters to avoid electromagnetic interference timing deviation