METSO A413144  plc control module

Turbine Generator Machine Protection

Monitoring of Turbine-Generators with

measurements of:– thrust position with eddy probes– shaft movement with eddy probes– case expansion with eddy probes or LVDT´s– differential expansion with eddy probes, single or

swap-over– shaft eccentricity with eddy probes– absolute vibration with accelerometers or velomitors

Designed according to API670 standard– Protective monitoring by the I/O cards– Cards operate even if connection into PCS is lost– Redundant power supply unit– Redundancy supported for protection only solution

Technical Parameters (Technical Data)

Parameter	Specification
Component Type	Pneumatic Relay / Amplifier Module
Supply Pressure Range	1.4 – 8.0 bar (20 – 115 psi)
Air Delivery Capacity	Optimized for fast stroking (approx. 8–18 $Nm^3/h$ depending on supply)
Steady-state Air Consumption	Very Low (< 0.1 $Nm^3/h$ at 4 bar)
Operating Medium	Filtered, non-lubricated air or sweet natural gas
Filtration Requirement	< 40 $\mu m$ (5 $\mu m$ recommended for longevity)
Temperature Range	-40°C to +85°C (-40°F to +185°F)
Housing Material	High-grade Aluminum with corrosion-resistant coating

Valmet DNA Turbine Protection I/O

Machine protection

AIF4E

Eddy current measurement for shaft

position or vibration measurement- 4 input channels- each channel configurable for

both static  and dynamic  values,- 2 calculated values per

channel supported- 100 ms update rate (API670)- raw signal sample buffers for

diagnostic application- 4 output channels 4 – 20 mA ,

any value to any output

Machine protection

AIF4V

Absolute vibration

measurement  using

accelerometers or velomitors

Machine protection

AIT4L

Casing absolute expansion and

valve position- 4 input channels- each channel configurable for

2 calculated values per

channel, rms or peak, vibration

acceleration or velocity- 100 ms update rate (API670)- raw signal sample buffers for

diagnostic application- 4 output channels 4 – 20 mA ,

any value to any output

4 input channels

Isolation- Field to system 1500 VAC- Between channels 1500 VAC- 4 LVDT/RVDT input channels- 5 and 6 wire LVDT/RVDT support- all electronics  in card, only LVDT

sensor

out in the field- input update interval 1 ms- settable measurement

Controller and power supply

functions

ACN MR, 2x IPSP- redundancy in HW and SW- redundant power supply- self diagnostic- communication to 3rd party (Modbus TCP, Profibus, etc)-

integrated part of Valmet DNA system network- alarms and events- configuration of  I/O cards with EAS SW-card parameter download when card is changes(hot swap)- optional diagnostic

The Metso (now Neles/Valmet) A413152 is a specialized Pneumatic Relay / Pilot Valve Assembly, specifically designed as a core component for the Neles ND9000 series intelligent valve positioners.

It serves as the physical interface that converts electronic signals into pneumatic power to move the valve actuator.

1. Product Description

The A413152 is a high-performance pneumatic relay.

In the architecture of an intelligent positioner, the electronic circuit board (like the A413140) calculates the required movement, but it is the A413152 relay that actually directs the compressed air to the actuator chambers.

It is a “pre-amplifier” stage that allows a very small electrical signal to control a large volume of high-pressure air with extreme precision.

Its design focuses on high dynamic response and minimal air consumption during steady-state operation.

2. Technical Parameters (Technical Data)

Parameter	Specification
Component Type	Pneumatic Relay / Amplifier Module
Supply Pressure Range	1.4 – 8.0 bar (20 – 115 psi)
Air Delivery Capacity	Optimized for fast stroking (approx. 8–18 $Nm^3/h$ depending on supply)
Steady-state Air Consumption	Very Low (< 0.1 $Nm^3/h$ at 4 bar)
Operating Medium	Filtered, non-lubricated air or sweet natural gas
Filtration Requirement	< 40 $\mu m$ (5 $\mu m$ recommended for longevity)
Temperature Range	-40°C to +85°C (-40°F to +185°F)
Housing Material	High-grade Aluminum with corrosion-resistant coating

A413152

3. Product Advantages & Key Features

High Dynamic Response: Enables the valve to react instantly to small setpoint changes, essential for stable process control.

Low Bleed Design: Significantly reduces the “instrument air” overhead costs by minimizing air leakage when the valve is in a fixed position.

Modular “Plug-in” Installation: The relay is designed as a single block that can be replaced by removing a few screws, without needing to dismantle the entire positioner or disconnect main air lines.

Contamination Resistance: Features integrated fine-mesh filters to protect the sensitive internal pilot stage from particles in the air supply.

Balanced Design: Operates reliably even if there are slight fluctuations in the plant’s main air supply pressure.

4. Application Cases

High-Frequency Modulation: Used in control loops that require constant adjustment, such as pressure-reducing stations or turbine steam control.

Fast-Acting Safety Valves: Integrated into systems requiring rapid “Fail-Safe” action upon signal loss.

Remote Gas Pipelines: Because of its low steady-state air consumption, it is ideal for sites using bottled gas or solar-powered compressors where gas/air volume is limited.

Corrosive Environments: Found in offshore oil platforms and chemical plants where internal components must resist salt air and chemical vapors.

A413152

5. Related & Other Models in the Series

The A413152 is part of the modular pneumatic ecosystem of the ND9000:

ND9100 / ND9200: The standard and high-flow intelligent positioners that utilize this relay.

A413120: A similar pneumatic relay module (check serial number compatibility for specific flow requirements).

A413150: A standard version of the relay assembly; the A413152 often represents a specific revision or high-performance variant.

B1-Series Actuators: The pneumatic cylinders/diaphragms typically powered by this relay.

Filter Regulator (e.g., Neles K-series): The necessary upstream component required to protect the A413152 from moisture and debris.

The Metso (now Neles/Valmet) A413146 is a high-level electronic Communication and Control Board specifically designed for the Neles ND9000 series intelligent valve positioners, primarily those utilizing Foundation Fieldbus (FF) protocols.

1. Product Description

The A413146 is the digital “nerve center” for Fieldbus-compatible ND9000 positioners. Unlike standard 4-20 mA boards, this module is designed for fully digital plant architectures.

It processes complex control blocks, manages multidrop communication on the fieldbus segment, and executes advanced valve diagnostics.

It integrates the microprocessor, memory, and Fieldbus communication controller into a single, conformal-coated PCB designed for high reliability in volatile industrial environments.

2. Technical Parameters (Technical Data)

Parameter	Specification
Component Type	Main Circuit Board (Fieldbus Version)
Communication Protocol	Foundation Fieldbus (H1)
Power Supply	Bus-powered (9 – 32 V DC per IEC 61158-2)
Current Consumption	Typically 15 – 18 mA
Function Blocks	AO (Analog Output), PID, Transducer, and Resource Blocks
Diagnostics	Advanced (Friction, Load, Speed, Device Health)
Execution Time	< 20 ms for AO block
ITK Version	Compatible with latest Interoperability Test Kits

3. Product Advantages & Key Features

Full Digital Integration: Supports bidirectional communication, allowing the DCS to read not just position, but also internal air pressure, friction trends, and temperature.

PID at the Device: Supports “Control in the Field” (CiF), where the PID control loop can be executed directly on the A413146 board rather than the central DCS, increasing system speed and redundancy.

A413146

Predictive Maintenance: Uses the “Triton” diagnostic suite to track valve performance signatures, identifying “stick-slip” behavior before it causes a process shutdown.

Low Power Design: Optimized for H1 segments, allowing for a higher number of devices per segment.

Simplified Calibration: Supports remote auto-calibration and configuration via Fieldbus management software (like Metso ValvGuard or Emerson AMS).

A413146

4. Application Cases

Smart Factories / Industry 4.0: Used in modern plants where all field devices are networked via Foundation Fieldbus for centralized asset management.

Oil & Gas Offshore Platforms: Ideal for remote monitoring where frequent physical inspection of valves is difficult or dangerous.

Large-Scale Chemical Processing: Managing complex control loops with high accuracy and digital precision to ensure product consistency.

Safety Systems: Implementing Partial Stroke Testing (PST) to ensure emergency shutdown valves are operational without stopping the process.

5. Related & Other Models in the Series

The A413146 is part of a modular family of boards for the ND9000 series:

A413140 / A413240: The HART version of the main board (4-20 mA).

A413145: A similar Foundation Fieldbus board revision (check version compatibility for your specific firmware).

A413148: The Profibus PA version of the main electronics module.

A413111: The potentiometer unit that provides the mechanical feedback to this board.

ND9300 / ND9400: The specific positioner model numbers that typically utilize Fieldbus boards like the A413146.

The Metso (now Neles/Valmet) A413240A is a specialized Circuit Board assembly, specifically the Main Electronics Module for the Neles ND9000 series intelligent valve positioners.

It is the upgraded or specific revision of the control board used to manage high-precision valve modulation and diagnostics.

1. Product Description

The A413240A acts as the central processing unit for the ND9000 digital positioner.

It is responsible for the “intelligence” of the valve, performing real-time PID calculations, managing HART communication, and monitoring the health of the valve-actuator assembly.

This specific revision (often denoted by the ‘A’ suffix) is engineered for high reliability in extreme industrial environments, featuring advanced noise filtering and power management to ensure stable performance even on long cable runs or weak 4-20 mA loops.

2. Technical Parameters (Technical Data)

Parameter	Specification
Component Type	Main Controller PCBA (Printed Circuit Board Assembly)
Communication	4-20 mA with HART 5, 6, or 7 support
Input Impedance	Equivalent to approx. 470 $\Omega$ at 20 mA
Minimum Current	3.6 mA for basic operation; 3.8 mA for communication
Microprocessor	High-speed, low-power RISC controller
Ambient Temperature	-40°C to +85°C (-40°F to +185°F)
Humidity Limits	0–95% RH (Non-condensing)
Conformal Coating	Standard (protects against moisture and corrosive gases)

3. Product Advantages & Key Features

High-Speed Control Loop: Capable of processing feedback signals at millisecond intervals to ensure zero steady-state error.

Advanced Diagnostics: Supports “Online Valve Signature” and “Performance Trend” monitoring, allowing users to see friction changes or air leaks without stopping the process.

Low Voltage Drop: Designed to operate on a very low “Lift-off voltage,” making it compatible with older DCS systems or those with high-resistance barriers.

A413240A

Modular Hardware: Allows for the easy addition of optional modules like internal Limit Switches or 4-20 mA Position Transmitters (AO).

EMI/RFI Protection: High immunity to electromagnetic interference, ensuring the valve doesn’t “jump” when handheld radios are used nearby.

A413240A

4. Application Cases

Critical Control Loops: Used in oil refineries for precise pressure and temperature control in cracking units.

Remote Diagnostics: In large-scale chemical plants where technicians use HART multiplexers to check valve health from the control room.

Pulp & Paper: Managing “Stock Flow” valves where high vibration and humidity are constant factors.

Safety Instrumented Systems (SIS): Serving as the control electronics for ValvGuard (PST) systems to ensure emergency shutdown valves are functional.

5. Related & Other Models in the Series

The A413240A is often used interchangeably or alongside these related components:

ND9100 / ND9200: The primary positioner housings that utilize this board.

A413111: The feedback potentiometer unit that connects to this board via a ribbon cable.

A413120: The pneumatic relay (pre-amplifier) that this board controls.

A413245: The Foundation Fieldbus (FF) or Profibus version of the main board.

Service Kit (Revision specific): Often sold as part of a “Major Spare Parts Kit” for the ND9000 series.

METSO  A413150   Controller board

Valmet DNA Machine

Monitoring

Power Plants

Valmet´s Machine Monitoring

Offering in Brief

• DNA Machine Monitoring (on-line)

• Paper & board

• condition, runnability, lube oil

• Tissue

• including crepe blade chatter

• Pulp mill

• total plant, including slowly rotating machinery

• Power plants

• TG protection and analysis

• BOP analysis and possible protection

• Valmet Maintenance Pad

• as a tool for end customer

• Services

• as a cervice concept & tool for Valmet

• remote monitoring, at site analysis,  IoT

• system services, sensors&cables, etc

Mechanical monitoring and protection systems

for power plant

METSO A413150 Controller board In stock

A413150

Technical Parameters

Parameter	Specification
Component Type	Main Processing Board (PCBA)
Communication Protocol	HART (Typically 4-20 mA loop powered)
Input Signal	4 – 20 mA DC
Supply Voltage	Loop-powered (Minimum 9.0 V DC at 20 mA)
Microprocessor	High-performance 16/32-bit RISC processor
Diagnostics	Online & Offline (Triton/ValvGuard compatible)
Mounting	Internal bracket within ND9100/ND9200 housing
Protection	Conformal coating for humidity and chemical resistance

• Turbine Generator Vibration Protection

•Mechanical measurements, real time analysis

(100 ms cycle) and safety interlocks

• Turbine Generator Diagnostics

•Mechanical measurements with advanced analytical

calculations

A413150

•Dedicated analysis of different operating stages

(idling, shut down /run-up, steady stage)

• Condition Monitoring for auxiliary machines (BOP)

•”Less critical” machinery: pumps, fans, motors etc

DNA Machine Monitoring

Monitoring in Valmet DNA control system, key benefits in short

Common user interface for machine and process

control and condition monitoring– Lower user barrier especially for operators– Easier to use and share information between operation and

maintenance

Common history database for all control and machine

condition data– Efficient analysis and reporting– Easy comparison of different data– One source of data for Valmet IoT

One system and one engineering environment for

condition monitoring and process control– Cost efficient to build and maintain

Linking into ERP and data sharing (DNA Diary)– Only one link for all needs (operations, instrumentation, machinery)– Supports information sharing between all teams

The Metso (now Neles/Valmet) A413140 is a critical electronic component, specifically the Main Circuit Board (CPU/Communication Board) designed for the Neles ND9000 series intelligent valve positioners.

It acts as the “brain” of the device, processing control signals and managing the valve’s advanced diagnostics.

1. Product Description

The A413140 is the primary internal controller board for the ND9000 digital positioner.

It is responsible for receiving the 4-20 mA input signal (often with HART communication), calculating the required valve position, and controlling the pneumatic pilot valves to move the actuator.

This board is engineered to perform high-speed calculations for PID control loops and stores historical data for “Valve Performance Monitoring” and predictive maintenance.

A413140

2. Technical Parameters

Parameter	Specification
Component Type	Main Processing Board (PCBA)
Communication Protocol	HART (Typically 4-20 mA loop powered)
Input Signal	4 – 20 mA DC
Supply Voltage	Loop-powered (Minimum 9.0 V DC at 20 mA)
Microprocessor	High-performance 16/32-bit RISC processor
Diagnostics	Online & Offline (Triton/ValvGuard compatible)
Mounting	Internal bracket within ND9100/ND9200 housing
Protection	Conformal coating for humidity and chemical resistance

3. Product Advantages & Features

Advanced Control Algorithms: Utilizes proprietary Metso algorithms to eliminate “overshoot” and “hunting,” even in high-friction valves.

HART Integration: Supports full HART communication, allowing technicians to calibrate and troubleshoot the valve remotely using a handheld communicator or PC software.

Performance Diagnostics: Automatically tracks travel distance, number of cycles, and deviation trends to predict when the valve requires service.

Modular Architecture: The A413140 is designed for easy swap-out maintenance, allowing users to upgrade or repair a positioner without removing it from the pipeline.

Environmental Hardening: Built to withstand extreme industrial vibrations and temperatures from -40°C to +85°C.

A413140

4. Application Cases

Smart Automation Systems: Integrated into DCS (Distributed Control Systems) via HART for real-time valve status monitoring.

Critical Control Loops: Used in pressure or flow control loops where high-speed response and zero steady-state error are required.

Predictive Maintenance Programs: Used in large-scale plants (Refineries, Power Plants) to identify “stick-slip” or air leaks before a failure occurs.

Safety Instrumented Systems (SIS): Often found in ValvGuard versions of the ND9000 for Partial Stroke Testing (PST).

5. Related & Other Models in the Series

The A413140 is the heart of the ND9000 family, which includes several specialized variants:

ND9100: Universal positioner for rotary and linear valves (Standard HART).

ND9200: High-flow version for large actuators.

ND9300 / ND9400: Versions supporting Foundation Fieldbus or Profibus PA (these use different circuit boards, e.g., A413145).

A413111: The potentiometer (feedback) unit that plugs into this main board.

A413120: The Pneumatic Relay/Pre-amplifier module controlled by this board.

The Metso (now Neles/Valmet) A413111 is a high-precision Potentiometer Unit or Feedback Sensor Module specifically designed for use within the Neles ND9000 series intelligent valve positioners. It serves as the “eyes” of the positioner, providing continuous electronic feedback of the valve’s actual position.

1. Product Description

The A413111 is a specialized electronic assembly consisting of a high-resolution potentiometer mounted on a PCB.

It is installed inside the positioner housing and coupled to the actuator shaft. Its primary function is to convert the mechanical rotation (or linear movement) of the valve into a precise electrical resistance signal, which the positioner’s microprocessor uses to ensure the valve reaches the exact desired setpoint.

This component is engineered for extreme reliability, as any failure in this unit would result in the “loss of feedback,” causing the valve to fail-safe or hunt for position.

2. Technical Parameters

Parameter	Specification
Component Type	Potentiometer Feedback Board / Sensor Unit
Resistance Range	Typically 5kΩ or 10kΩ (Optimized for ND9000 logic)
Linearity	< ± 0.5% of total stroke
Rotational Angle	Up to 90° (Rotary) / Compatible with linear stroke adapters
Operating Voltage	Low voltage (supplied by the ND9000 internal circuit)
Connection	Multi-pin ribbon cable or plug-in header
Operating Life	> 2 million cycles (High-durability conductive plastic)
Protection	Conformal coating for moisture and vibration resistance

A413111

3. Product Advantages & Features

High Precision: Provides micro-degree resolution, enabling the ND9000 to maintain extremely tight control loops.

Rugged Construction: Designed to withstand the constant “dithering” (small movements) required for precise throttle control without wearing out.

Temperature Stability: Minimal resistance drift across the standard industrial temperature range (-40°C to +85°C).

Direct Integration: Part of the Metso “Modular Design” philosophy, allowing for easy field replacement without replacing the entire positioner.

Vibration Dampening: The PCB and mounting are designed to handle the high-frequency vibrations found in heavy-duty piping systems.

4. Application Cases

Control Valve Loops: Essential for any modulating valve application (e.g., steam flow control, pressure regulation).

Critical Process Control: Used in pulp and paper mills for exact liquor and pulp flow management.

Chemical Batching: Ensuring exact valve opening percentages for chemical dosing and mixing.

Energy Sector: Position feedback for turbine bypass valves or feedwater control valves.

5. Related & Other Models in the Series

The A413111 is often associated with specific versions of the ND9000 and ND7000 positioners.

ND9100 / ND9200: The intelligent positioners that typically house the A413111 module.

A413112 / A413113: Variations of the feedback board, sometimes including additional limit switches or different connector types.

Neles RE series: Rotary actuators that provide the mechanical motion for this sensor.

Service Kits: Often included in ND9000 Maintenance Kits along with seals and filters.

The Metso (now Neles / Valmet) D100308 is a critical internal component, specifically a Solenoid Pilot Valve / Terminal Assembly, typically utilized within the Neles D-series (DXP/DXR) or EasyLink valve monitoring systems.

It is an essential part of the pneumatic control chain for automated rotary valves.

1. Product Description

The D100308 is a specialized module designed for integration into Neles limit switch boxes and positioners. Its primary function is to act as the interface between the electrical control signal (from a PLC/DCS) and the pneumatic actuator.

When energized, this pilot assembly redirects air pressure to the actuator to open or close the valve.

It is known for its compact, modular design, which allows it to be housed safely inside an explosion-proof or corrosion-resistant enclosure alongside position switches.

2. Technical Parameters

Parameter	Specification
Component Type	Solenoid Pilot Valve / Integrated Manifold Card
Operating Voltage	24 V DC (standard), 110/240 V AC (optional variants)
Power Consumption	Approx. 0.6W to 1.8W (Low power design)
Pressure Range	2.0 to 8.0 bar (30 to 116 psi)
Pneumatic Connection	Manifold mounted (EasyLink interface)
Flow Capacity (Cv)	Optimized for Neles B1-series actuators
Duty Cycle	100% Continuous
Media	Filtered, non-lubricated compressed air or inert gas

3. Product Advantages & Features

Integrated Design: By housing the solenoid inside the switch box, it eliminates external wiring and pneumatic tubing between the switch and the solenoid, reducing failure points.

Low Power Consumption: Engineered for modern DCS systems, allowing multiple units to be powered from a single I/O card.

EasyLink Compatibility: Features a “Plug-and-Play” interface that allows for rapid replacement in the field without disturbing the main pneumatic piping.

Hazardous Area Ready: When installed in a DXP or DXR housing, it inherits the enclosure’s ATEX, IECEx, and CSA certifications for use in Zone 1/Division 1 environments.

Environmental Protection: Internal mounting protects the delicate solenoid coil from salt spray, chemicals, and physical impact.

4. Application Cases

Emergency Shutdown (ESD): Used in oil and gas upstream facilities where a valve must close reliably upon signal loss.

Batch Processing: Frequent cycling in chemical and pharmaceutical plants where high-speed valve actuation is required.

Corrosive Environments: Offshore platforms and paper mills where external solenoids would corrode; the D100308 stays protected inside the Neles housing.

Automated Isolation: Providing remote control for large-scale butterfly or ball valves in water treatment and mining.

5. Related & Other Models in the Series

The D100308 belongs to the modular ecosystem of Neles automation. Related parts and series include:

D100307 / D100309: Similar assemblies with different voltage ratings or internal orifice sizes.

DXP Series: The “Flameproof” aluminum housing that typically contains the D100308.

DXR Series: The “Composite” corrosion-resistant housing for chemical applications.

EPX Series: The Neles intrinsically safe (IS) version of the pilot assembly.

B1-Series Actuators: The primary pneumatic hardware that this pilot valve is designed to control.

The Metso (now Neles/Valmet) D201925 is a specialized, high-performance Position Indicator / Limit Switch Box component, typically utilized within the Neles D-series or EasyLink modular platforms.

It is designed to provide precise mechanical-to-electrical feedback regarding the position of rotary valves in industrial process automation.

1.  Product Description

The D201925 serves as a core internal component for valve monitoring systems.  It acts as the interface between the pneumatic actuator’s mechanical rotation and the control system (PLC/DCS).

This specific part number often refers to a Switch/Sensor assembly or a Terminal Card used inside the Neles limit switch boxes (such as the DXP or DXR series).

It is engineered to withstand harsh vibration and corrosive environments common in chemical plants, refineries, and offshore platforms.

2.  Technical Parameters

Note: As a specialized component, parameters may vary slightly based on the housing assembly it is installed in.

Parameter	Specification
Component Type	Switch Module / Limit Switch Card
Contact Type	SPDT (Single Pole Double Throw) or Inductive Proximity
Voltage Rating	24 V DC / 120 V AC (Dependent on switch configuration)
Housing Compatibility	Neles D-Series, DXP, DXR, and DKX Enclosures
Enclosure Rating	Typically IP66/IP67 (when installed in the correct housing)
Operating Temperature	-40°C to +80°C (-40°F to +176°F)
Connection Type	Screw terminals / Plug-in modular headers
Certification	Often ATEX/IECEx certified for hazardous zones

3.  Product Advantages & Features

Modular “EasyLink” Integration: Designed for rapid installation and replacement without needing to recalibrate the entire valve assembly.

High Vibration Resistance: Internal components are secured to prevent “contact bounce” or signal loss in heavy-duty industrial environments.

Gold-Plated Contacts: Often features high-quality contact surfaces to ensure reliable signal transmission even at very low currents (dry circuits).

Visual Feedback: Usually compatible with “Beacons” or “Pointers” on the exterior of the switch box for local operator inspection.

Corrosion Protection: Treated with specialized coatings to resist acidic or salty atmospheres.

D201925

D201925

4.  Application Cases

Oil & Gas Refineries: Monitoring the “Open/Closed” status of emergency shutdown valves (ESV).

Pulp & Paper Mills: Used on rotary segment valves for controlling flow in corrosive liquor lines.

Chemical Processing: Feedback for automated batching systems where precise valve timing is critical for safety.

Water Treatment: Signal feedback for large-scale butterfly valves in filtration and distribution.

5.  Related & Other Models in the Series

The D201925 is part of the extensive Neles / Metso Monitoring family.  Related components and assemblies include:

DXP Series: The “Universal” metal switch box (Ex d / Flameproof).

DXR Series: Composite resin switch box for highly corrosive environments.

D201924 / D201926: Variations in the circuit card or sensor type (e.g., different proximity sensors like P+F or IFM).

Neles ND9000: The high-end intelligent valve controller (Positioner) which provides digital diagnostics beyond simple limit switches.

Switch Types: Often fitted with Crouzet microswitches or Pepperl+Fuchs proximity sensors.