Turck BI8U-M18-AP6X-H1141 M18 Flush Inductive Sensor 8 mm PNP

What the BI8U-M18-AP6X-H1141 does

BI8U-M18-AP6X-H1141 is an M18 uprox+ threaded-barrel inductive sensor with an extended 8 mm rated switching distance in a flush-mountable chrome-plated brass housing. It is a 3-wire DC device with a PNP normally-open output and an M12 x 1 male connector.

Feature list printed by the manufacturer: DC 3-wire, 10…30 VDC; Chrome-plated brass; M12 x 1 male connector; Protection class IP68; Threaded barrel, M18 x 1; Recessed mountable; Large switching distance; NO contact, PNP output; Resistant to magnetic fields.

Technical specifications

Where it fits and how it behaves

The extended range is the main reason to choose this part over a standard 5 mm M18 sensor: the extra switching distance leaves a larger air gap between the active face and the target, which helps where guards, covers or machine tolerances limit how close the sensor can sit. Turck lists factor 1 for all metals, so steel, aluminium and brass targets are detected at the same rated distance. Typical uses are position and presence feedback on valve actuator brackets, pump skid frames, conveyor and fabrication equipment.

Installation hint: tighten the housing nut only to the torque shown in the table, keep the active face clear of surrounding metal to the extent the mounting distances require, and route the cable away from welding and heavy motor feeders where practical. A sensor set too close to adjacent metal can switch earlier than the rated distance suggests.

Ordering code and what to confirm

Reading the code against the datasheet rows (a derived summary, not Turck’s own key): the leading BI corresponds to the mounting condition shown as Flush, the digits to the rated switching distance of 8 mm, the housing token to the design Threaded barrel, M18 x 1, the output suffix to 3-wire, NO contact, PNP, and the last element to the connection Connector, M12 × 1. Ident number 1644731 identifies this exact variant in the Turck catalogue.

A short checklist before you order: NO or changeover) of your PLC input, the connector type and cable length, the target material and gap, the mounting condition (flush or non-flush) against the free zone around the sensor, and the supply voltage and output type (PNP or NPN. Specifications here are restated from the official datasheet and should be matched against the current maker revision.

Key features of the uprox+ design

• Factor 1 on all metals: steel, stainless steel, aluminium, brass and copper targets switch at the same 8 mm rated distance, so no correction factor is needed when the target material changes.
• Flush mounting with an extended range, combining the mechanical protection of a recessed active face with a switching distance well above that of a standard flush M18 sensor.
• Magnetic field immunity to 300 mT for DC and AC fields, which allows use near resistance welding equipment, electrolysis cells and large motors where conventional ferrite-core sensors can switch falsely.
• IP68 rating and a −30…+85 °C ambient range for wash-down, outdoor and hot machine areas.
• Full short-circuit, wire-break and reverse-polarity protection, which reduces damage from wiring errors during commissioning.

Selection guidance

Use in Oman and GCC conditions

The +85 °C ambient limit gives margin for sensors mounted on equipment in direct sun, on hot pump casings or inside machinery enclosures during the Gulf summer. The IP68 rating and the sealed M12 connection resist dust storms and wash-down water, provided that the mating cordset is also IP67/IP68-rated and the connector is tightened correctly. In coastal and offshore areas with salt air, check the chrome-plated brass housing periodically and consider a stainless steel variant where corrosion is severe. Typical Omani applications include valve position feedback in water networks and oil and gas facilities, door and guard detection, and speed monitoring on conveyors at mines and cement plants.

Installation and maintenance

• Set the gap at roughly 60 to 80 percent of the rated distance so normal vibration and temperature drift do not cause the output to chatter.
• Use the two lock nuts to fix the sensor, not exceeding the 25 Nm torque limit.
• Protect the cable with conduit or a cable carrier where it can be crushed or abraded.
• Check the yellow LED during routine rounds and clean metal chips from the active face.

What to include in your RFQ

State the exact type BI8U-M18-AP6X-H1141 and ident number 1644731, the quantity, any mating M12 cordset with its length and angle, and whether mounting brackets are needed.

Documents and quotation

The official Turck datasheet for BI8U-M18-AP6X-H1141 is hosted here as a PDF so you can check every value before you send an RFQ. Seven Star LLC is an independent supplier in Muscat; we do not set the manufacturer’s specifications, and this page restates what the datasheet prints. For availability and a quotation, send the exact code BI8U-M18-AP6X-H1141 and your quantity through the Inductive Proximity Sensors category or the RFQ form.