TURCK BIM-UNT-AP7X Series Modules

Technical Dossier

Product Details And Specifications

TURCK BIM Series Technical Notes

The TURCK BIM (Bi-Modal Inductive) series of cylinder position sensors has established a significant installed base across global heavy industry — including petrochemical plants, automotive body-in-white lines, steel mill hydraulic systems, and offshore platform actuator control. These sensors are designed to mount directly onto pneumatic and hydraulic cylinders, detecting piston position without mechanical contact. Their compact form factor and standardized T-slot or band-mount interface made them the default specification in thousands of machine designs from the 1990s through the 2010s.

As original equipment manufacturers have cycled through product generations, many BIM variants have entered end-of-life or limited-availability status. Facilities running legacy pneumatic control circuits — particularly those integrated with Siemens S5/S7 PLCs, Allen-Bradley SLC 500, or Omron CJ-series controllers — continue to depend on exact-replacement BIM sensors to avoid retooling cylinder mounts or rewiring I/O cards.

The Evolution of BIM Series Architecture

TURCK introduced the BIM series as a standardized cylinder sensor platform in the late 1980s. The initial generation used reed switch technology, later superseded by solid-state inductive sensing elements that offered longer service life and resistance to vibration-induced contact bounce. Key architectural transitions include:

• Generation 1 (Reed Switch): BIM-UNT and BIM-EG variants with 2-wire AC/DC output. Widely deployed in early pneumatic automation. Many are now discontinued.
• Generation 2 (Solid-State NPN/PNP): Introduced 3-wire DC output with short-circuit protection. The BIM-UNT-AP7X belongs to this generation. Compatible with standard 24 VDC PLC I/O modules.
• Generation 3 (IO-Link capable): Current production variants such as BIM-UNT-AP7X-H1141 support IO-Link communication for diagnostics and parameterization. These are not backward-compatible at the connector level with older installations without adapter cables.

Facilities that standardized on Generation 2 wiring and connector schemes face a compatibility gap when sourcing replacements from current TURCK catalogs. Exact-model sourcing from specialist distributors remains the lowest-cost resolution path.

BIM Series Full Catalog & Functionalities (SKU List)

The following SKUs represent confirmed models within the TURCK BIM cylinder sensor family, organized by output type and mounting format:

NPN Output (Sinking) — T-Slot / Band Mount:

• BIM-UNT-AP7X: NPN NO output, 10–30 VDC, T-slot mount, M8 connector, standard sensing range for pneumatic cylinders.
• BIM-UNT-AN7X: NPN NC output, 10–30 VDC, T-slot mount, M8 connector — normally-closed logic variant.
• BIM-UNT-AP7X-H1141: NPN NO output with IO-Link interface, T-slot mount — current-generation replacement with diagnostic capability.
• BIM-UNT-AP6X: NPN NO output, 6 mm sensing face, compact T-slot body for narrow cylinder profiles.

PNP Output (Sourcing) — T-Slot / Band Mount:

• BIM-UNT-AP7X-0.3-PSG3M: PNP NO output, pre-wired 0.3 m cable, T-slot mount — common in space-constrained installations.
• BIM-UNT-PP7X: PNP NO output, 10–30 VDC, T-slot mount, M8 connector.
• BIM-UNT-PN7X: PNP NC output, T-slot mount, M8 connector.
• BIM-EG-AP7X: PNP NO output, EG-series elongated body for larger bore cylinders, T-slot mount.
• BIM-EG-AN7X: PNP NC output, EG-series elongated body.

2-Wire AC/DC (Reed Switch Legacy):

Special Mounting / Extended Temperature:

• BIM-UNT-AP7X-0.3-RS4.31T: NPN NO, M12 connector, extended temperature rating, T-slot mount — suitable for foundry and outdoor hydraulic applications.
• BIM-IKT-AP7X: NPN NO, IKT-series integrated cable body, direct cylinder band mount without T-slot requirement.
• BIM-IKT-PP7X: PNP NO, IKT-series integrated cable body.
• BIM-UNT-AP7X-B3131: NPN NO, NAMUR output variant for intrinsically safe (Ex) zone installations — petrochemical and gas processing applications.

Sourcing Hard-to-Find & Obsolete BIM Series Parts

Several BIM variants — particularly reed switch models (Y1X suffix) and early solid-state units without IO-Link — have been discontinued by TURCK or moved to limited-availability status. Standard distribution channels typically carry only current-production IO-Link variants, leaving facilities with legacy wiring schemes without a direct catalog source.

Quality Control for the BIM Series Range

BIM series sensors present specific failure modes that require targeted inspection before dispatch:

• Sensing face inspection: The ferrite sensing element is inspected under magnification for micro-fractures caused by cylinder impact — a common failure mode in high-cycle applications.
• Output switching verification: Each unit is tested on a calibrated test rig that simulates piston approach at rated sensing distance. NPN and PNP output logic is verified against specification.
• Connector and cable integrity: M8 and M12 connector pins are inspected for corrosion and mechanical deformation. Pre-wired cable variants are tested for continuity and insulation resistance.
• Housing seal check: IP67 rating is verified by visual inspection of O-ring condition and housing joint integrity. Units with compromised seals are rejected.
• Electrical parameter verification: Supply voltage range (10–30 VDC), leakage current, and voltage drop are measured and logged for each unit.