Name: ALE111-S51 | Intrinsic Safety Barrier
Availability: InStock

ALE111-S51 | Intrinsic Safety Barrier

Parameter Name	Parameter Value
Product Model	ALE111-S51
Manufacturer	Yokogawa Electric
Product Type	Intrinsic Safety Barrier
Protection Type	Ex ia IIC T6 Ga/Gb
Input Signal	4-20mA (2-wire) with HART® pass-through
Output Signal	4-20mA passive output
Voltage Rating	30V max (Ui)
Current Rating	110mA max (Ii)
Power Dissipation	1.1W @ 24V DC
Isolation	1500V AC (field to logic)
Response Time	≤ 2ms (10-90% step)
Operating Temp	-40°C to +80°C (-40°F to +176°F)
Safety Certification	ATEX, IECEx, FM, CSA
Mounting	DIN rail TS35/7.5/15

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Description

Product Overview

The YOKOGAWA ALE111-S51 is an intrinsically safe (IS) interface barrier designed for hazardous area signal conditioning within the ProSafe®-RS safety instrumented system. Engineered to meet the stringent requirements of Zone 0/Division 1 environments, this compact DIN-rail module provides galvanic isolation and energy limitation for 4-20mA/HART® field instruments in explosive atmospheres. The YOKOGAWA ALE111-S51 supports Ex ia IIC certification, delivering reliable signal transmission between safe and hazardous areas while preventing ignition sources. With integrated diagnostic LEDs and zero-adjustment analog circuitry, it simplifies commissioning in critical applications like gas detection and emergency shutdown systems. Its rugged epoxy resin encapsulation withstands harsh industrial conditions including high humidity (0-95% RH non-condensing) and chemical exposure per ISA-S71.04 Class G3 standards.

Technical Specifications

Parameter Name	Parameter Value
Product Model	ALE111-S51
Manufacturer	Yokogawa Electric
Product Type	Intrinsic Safety Barrier
Protection Type	Ex ia IIC T6 Ga/Gb
Input Signal	4-20mA (2-wire) with HART® pass-through
Output Signal	4-20mA passive output
Voltage Rating	30V max (Ui)
Current Rating	110mA max (Ii)
Power Dissipation	1.1W @ 24V DC
Isolation	1500V AC (field to logic)
Response Time	≤ 2ms (10-90% step)
Operating Temp	-40°C to +80°C (-40°F to +176°F)
Safety Certification	ATEX, IECEx, FM, CSA
Mounting	DIN rail TS35/7.5/15

Key Features and Advantages:

Certified Safety Performance:
Complies with IEC 60079-11 standards for intrinsically safe circuits, enabling direct installation in Zone 0 environments with hydrogen or acetylene risks. SIL 3 capability via certified SIS integration (IEC 61508/61511).

Signal Integrity Preservation:
<0.1% signal distortion maintains HART® digital communication integrity. Low-impedance design (<5Ω) eliminates voltage drop errors in long cable runs.

ALE111-S00

Robust Construction:
Epoxy-potted electronics withstand vibration to 5g RMS (IEC 60068-2-6) and corrosive atmospheres (H₂S ≤ 100ppm). Non-interacting zero/span adjustments accessible without disassembly.

Fail-Safe Diagnostics:
Dual-color LEDs indicate power status, field fault (open/short), and loop integrity. Automatic current clamping prevents signal overshoot during power transients.

Application Domains

The ALE111-S51 is essential in hazardous process environments:

Oil & Gas: Gas detection transmitters in offshore platform hazardous zones (ATEX Zone 1)
Chemical Plants: Level transmitters for solvent tanks with FM/CSA Class I Div 1 certification
Pharmaceutical: Pressure sensors in API synthesis reactors requiring HART® diagnostics
Mining: Methane monitors in underground shafts with IECEx Ta -40°C compliance
Power Generation: Hydrogen cooler monitoring in turbine halls (Class I Groups A-D)