TURCK IM1-22EX-R Isolating Switching Amplifier

TURCK IM1-22EX-R 2-Channel Isolating Switching Amplifier Safety Relay

The TURCK IM1-22EX-R (Ident No. 7541231) is a 2-channel isolating switching amplifier designed for galvanically isolated signal transmission from hazardous (Ex-Zone 0/1/20/21) areas to non-hazardous control systems. It connects directly to DIN EN 60947-5-6 (NAMUR) sensors or potential-free mechanical dry contacts. Equipped with a wide-range universal power supply (20 to 250 VAC / 20 to 125 VDC) and dual electromechanical relay outputs (1 NO contact per channel), this device is rated for Functional Safety applications up to SIL 2 according to IEC 61508.

Model Details

• Manufacturer: TURCK
• Part Number / MPN: IM1-22EX-R
• Ident No. (ID): 7541231
• Alternative Cross-References: IM1-22EX-R/24VDC (Ident: 7541210 – Note: 24VDC dedicated line), Pepperl+Fuchs KFD2-SR2-Ex2.W, P+F KHA6-SH-Ex2, Phoenix Contact MACX MCR-EX-SL-2NAM-RO.

Key Features

1. Intrinsically Safe Inputs (Ex ia/ib): Dual-channel input rated for connection to standard NAMUR initiators or mechanical switches deployed in Zone 0, 1, 20, and 21 hazardous gas or dust atmospheres.
2. Universal Wide-Range Power Supply: Internal power unit accepts 20 to 250 VAC (48–62 Hz) or 20 to 125 VDC, eliminating external instrument transformer constraints.
3. Selectable Channel Configuration: Independent 6-position front DIP switches for each channel allow selection between Normal (NO) and Inverted (NC) output mode, as well as enabling/disabling wire-break and short-circuit line diagnostics.
4. Functional Safety Certified: Certified SIL 2 / Systematic Capability SC 3 acc. to IEC 61508, delivering high operational reliability in critical safety loops.
5. Complete Galvanic 3-Way Isolation: 2.5 kV RMS full isolation barrier between input circuits, output circuits, and operating power supply prevents ground loops and transient spikes.

Marine & Industrial Applications

• Marine & Offshore Machinery: Cargo pump level alarms, fuel oil high/low float sensors, hazardous bilge monitoring, and ballast tank switch monitoring in compliance with major class requirements (DNV, Lloyd’s, ABS).
• Chemical & Petrochemical Systems: Intrinsically safe interface for emergency shutdown valves (ESD), flow meters, and limit switches in Zone 1/21 processing units.
• Tank Terminals & Storage: Overfill prevention systems, vapor recovery valves, and leak detection switches.
• Gas Compression & Metering Skids: Hazardous area pressure switch interlocks and pulse transmission.

Frequently Asked Questions

Can the TURCK IM1-22EX-R run directly on 24 VDC control power?

Yes. The universal wide-range power supply operates on any DC voltage between 20 VDC and 125 VDC, as well as AC voltage between 20 VAC and 250 VAC on terminals 7 and 8.

How do I correct a persistent Red Channel LED error on startup?

A red channel LED indicates that Line Fault Detection (LFD) has tripped due to an open circuit (wire-break) or shorted field loop. Verify the input circuit resistance. If you are wiring dry contacts without balancing resistors, set the DIP switches for Short-Circuit (SC) and Wire-Break (WB) monitoring to the OFF position.

Can I install the IM1-22EX-R directly inside an Ex-Zone area?

The amplifier unit carries Ex nA nC certification, allowing direct installation in ATEX Zone 2 when mounted inside an IP54-rated (or higher) certified enclosure. Its input channels are certified intrinsically safe for field devices located in Zone 0, 1, 20, or 21.

What is the functional difference between the IM1-22EX-R and the IM1-22EX-T?

The IM1-22EX-R utilizes electromechanical relay contact outputs (isolated NO contacts, up to 250 VAC / 2 A). The IM1-22EX-T uses solid-state transistor outputs designed for higher switching frequencies (up to 3 kHz) and direct PLC binary card integration without mechanical wear.