Railway Pressure Transmitter / Switch NAR 8258


Swiss based Trafag is a leading international supplier of high quality sensors and monitoring instruments for measurement of pressure and temperature. The pressure transmitter NAR 8258 with increased accuracy of 0.3% was specifically designed for railway vehicles (EN 50155) and has a long-term stable thin-film-on-steel sensor cell. The wide temperature range from -40°C to +125°C and the triple overpressure protection make the NAR 8258 the ideal choice for railway vehicles in rough environmental conditions.

The new NAR 8258 pressure transmitter/switch is the successor of the well-proven NAH 8253 with railway option. In addition, the NAR 8258 includes a pressure switch option. Based on the robust, reliable and successfully introduced NAH 8254 the NAR 8258 has been designed especially for applications on railway vehicles like break systems, compressors, air conditioning, fire extinguishing systems, refrigeration and many more.
The NAR 8258 offers an accuracy of ±0.3% and a wide operating temperature range of -40…125°C. During the production every device is individually tested with a dielectric strength of 710 VDC.

The NAR 8258 is designed according to normative railway requirements and complies with:

  • EN 61373 Rolling stock equipment - Shock and vibration
  • EN 50155 Electronic equipment used on rolling stock
  • EN 50121-3-2 Railway applications - Electromagnetic compatibility
  • EN 45545-2 Fire protection on railway vehicles
The NAR 8258 excels with its outstanding robustness and reliability at rough conditions like shock and vibration and is therefore the ideal choice for pressure measurement in demanding railway applications.


The pressure transmitter NAR 8258 is available in the pressure ranges 0…6 bar to 0…600 bar. The well-established pressure connections like G1/4“,1/4“ NPT and others are available. The NAR 8258 is capable of analogue output signal of 4...20 mA or switching outputs with 1 or 2 PNP transistors capable to switch up to 400 mA in total of both switching outputs. The electrical connections M12x1, DIN Industrial are also available.

Data sheet H72307
Flyer H70697
Instruction H73303
  • February 23, 2018

  • Varga Elektronik

Membrane pushbutton head with plastic front ring - IP69k

  • Supplement to the range Rontron-R-Juwel
  • mounting diameter Ø 22.3 mm
  • easy to clean
  • degree of protection IP66/IP67/IP69k
  • hygienic approval acc. to GS-NV6 *
  • suitable for different contact blocks
  • with illumination and labelling option
  • defined tactile pressure point
  • membrane available in different colours
  • * in preparation

    • February 12, 2018

    • Varga Elektronik

    Miniature Ecolab-certified photoelectric sensor detects presence of cheese portions in high-volume food processing


    During high-volume production of individually packaged cheese portions, conveyors deliver product to packaging stations. In-line buffering stations regulate flow to match packaging throughput; miniature Ecolab-certified sensors detect the presence of each portion after buffering, triggering the packaging cycle. Sensitivity parameters for each portion size, stored on the sensor’s inbuilt memory, may be updated remotely without manual intervention, eliminating the need for unplanned sanitization between batches.

    Customer Values
  • Ecolab-certified sensors are ideal for hygienic production facilities
  • Wide operating range accommodates full range of portion sizes
  • Sensitivity parameters are retrieved or updated remotely via IO-Link
  • Unnecessary sanitization between batches is avoided
  • Simple one- or two-step teach procedure optimizes initial sensor set-up
  • Stability alarm highlights reduced sensitivity, avoiding unplanned stoppages
  • Downtime is avoided by eliminating the need for technicians to attend machines

  • Specific Product Advantages
  • Ecolab-certified photoelectric sensors with background-suppression mode
  • IO-Link serial-connection protocol enabled on PNP versions at no additional cost
  • Pre-taught sensitivity parameters stored on inbuilt sensor memory
  • Remote sensitivity retrieval or update via IO-Link
  • Robust sensors with miniature (20mm x 30mm x 10mm) plastic housings

  • Customer Application

    A Swiss manufacturer of premium dairy products produces a range of individually packaged cheese portions in a high-volume hygienic production facility. Once cut to size, cheese portions travel on a food-grade conveyor to a packaging station; the duration of the packaging cycle is dependent on the type of cheese and the portion size.
    Prior to packaging, a buffering station produces a regular flow of portions with a predetermined spacing to suit the packaging throughput. The two operations must be synchronized; the manufacturer requires a sensor system that detects the presence of each cheese portion as it leaves the buffering station, triggering the packaging cycle.
    Sensors must be food-grade certified and withstand the aggressive cleaning agents used during washdown routines. They must also accommodate the full range of portion sizes without the need for manual adjustment, as this would necessitate sanitization each time the portion size changes. Maximizing throughput is an additional priority; rapid changeover between product batches is essential.

    Customer Solution

    Ecolab-certified, diffuse-mode photoelectric sensors with background suppression from the Contrinex C23 product family are ideally suited to this application. These miniature cubic devices, mounted above product conveyors immediately after each buffering station, detect the presence of cheese portions as they pass underneath. Positioning sensors is simple thanks to a range of adjustable stainless steel mounting brackets.
    An industry-standard PNP normally open output with an M8 connector ensures optimum flexibility. Additionally, IO-Link, a standardized point-to-point serial connection protocol for sensors and actuators, is enabled on PNP versions at no additional cost, offering the advantages of digital communication without the need for special cabling. A second output provides a stability alarm in the event of reduced sensitivity, flagging the need for preventative maintenance before any performance degradation occurs.
    Robust sensor construction, featuring miniature (20mm x 30mm x 10mm) plastic housings, ensures reliable operation in the demanding washdown environment; Contrinex C23 devices are rated to IP67. An operating range between 15mm and 250mm, adjustable via a teach button or via IO-Link, accommodates the range of portion sizes without compromise.

    A brief one- or two-step teach procedure simplifies initial set-up. One-button operation allows process engineers to teach the target object and, optionally, the background, each time a new portion size is introduced. Once taught, sensitivity parameters are stored on the sensor’s inbuilt memory and may be retrieved or updated remotely via IO-Link, eliminating the need for manual adjustment.
    These rugged miniature sensors meet the customer’s need for reliable operation with little or no manual intervention, while unplanned sanitization is avoided. The solution is highly cost-effective with minimal non-productive time; throughput is maintained at or above target levels.

    • February 2, 2018

    • Varga Elektronik

    Cable pass-through with brush seal


    Brush plates & brush strips for enclosures, server racks & machines

    icotek offers cable pass-through solutions with brush seal like brush plates and brush strips that are perfectly suitable for applications where no high sealing rate is required. The icotek brush seal solutions are meant for dust and dirt-proof cable pass-through of lines with or without preassembled connectors.
    The application areas for a brush based cable pass-through are very versatile, e.g. in an electrical enclosure, a server rack, on a machine wall or on raised floors. icotek brush plates and brush strips are a cost-effective solution for a professional cable management.

    The brush seal solutions allow reduced airflow while filtering out dust and larger particulate matter. Thermal protection and visual screening are additional benefits. icotek brush plates also protect cables against wear due to sharp edges of the cut-out.

    The rectangular brush plates KEL-BES (NEW! Now also available as split version KEL-BES-S) match exactly the cut-out dimensions for 10-, 16- or 24-pin standard industrial connectors.
    For round metric cut-outs M50 icotek offers the split brush plate KEL-BES-S 50. It can be either directly snapped into the cut-out or screwed with a locknut. For cable pass-through applications in base areas of enclosures and server racks by numerous manufacturers and for wide cut-outs on machine walls icotek offers the universal brush strip KDR-BES-U . Due to the innovative clamp profile the brush strip can be clamped on any sheet metal edge with a thickness of 1.5 - 2 mm, even in a 90° angle!

    The 2-piece enclosure gland plates KDR-BES are supplied with preassembled brush grommets. The base plates are suitable for Rittal TS8 enclosures and are installed with standard Rittal clips.

    • January 22, 2018

    • Varga Elektronik

    CP10.241-60: DC/DC converter for railway applications


    The new CP10.241-60 is a reliable, EN 50155-certified and highly efficient DC/DC converter for railway applications.

    Reliable, efficient and robust:

  • Input voltage: DC 110V (-30%/+40%), 0.1s 66Vdc (-40%)
  • Efficiency: 94.5%
  • Operating temperature range: -40°C to +70°C without derating (+85°C for 10 min.)
  • 100% higher mains failure bridging time than required by railway standard EN 50155 (S2)
  • Weather-resistant: PC boards with a conformal coating and spring clamp terminals
  • Minimal noise generation: 100% convection-cooled
  • Flexible use, rapid replacement: DIN rail mounting
  • EN 50155-certified

  • EN 50155 Electronic equipment used on rolling stock classified according to T3, TX, C2 and S2
  • EN 61373 Shock and vibration tests classified according to Cat.1, Class B
  • EN 50121-3-2 EMC requirements
  • EN 45545-2 Fire protection on railway vehicle according to Hazard Level HL3
  • Learn more about the new CP10.241-60.

    • January 12, 2018

    • Varga Elektronik

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