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RTA421
Limit switch

Limit switch RTA421 ©Endress+Hauser

Contactor with loop power supply for monitoring current or voltage signals

The RTA421 contactor monitors industrial processes for safe operation. The unit analyzes current (0/4...20 mA) and voltage signals (0/2...10 V) and switches two independent output relays if the values either exceed or undercut the preset alarm set points. On the display both limit values are indicated in parallel. The bar graph informs on the connected signal at any time. Applications include pump control in the waste water industry. Level measurement in silos can be economically achieved.

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  • Designed for demanding applications

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Meet your basic measurement needs

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Handle your core processes easily

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Optimize your processes with innovative technologies

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Master your most challenging applications

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  • Specs at a glance

    • Input

      1 x analog (U, I)

    • Output

      1 x transmitter power supply

    • Output

      1 x transmitter power supply

    • Display

      LCD 6 mm (0.24")
      4-digit
      Bargraph

    • Power Supply

      Not defined

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  • Benefits

    • 2 relays for set point monitoring (with SPDT contacts)

    • Loop power supply for connected sensors

    • LC display for alarm set points and bar graph

    • Compact housing

    • Front end setup using 3 push buttons

    • DIN rail mounting, 45 mm housing width

  • Field of application

    • Plant and machine construction

    • Panel builders

    • Process monitoring

    • Process control

Features and specifications

Back

Details

  • Measuring principle

    Contacter

  • Function

    Display

    Power

    Switch

  • Certification

    -

  • Input

    1 x analog (U, I)

  • Output

    1 x transmitter power supply

  • Relay output

    2 x changeover contacts

  • Auxiliary power supply / Loop power supply

    196...250 V AC

    97...127 V AC

    20...250 V AC/DC

  • Dimensions (wxhxd)

    45 x 107.8 x 112 mm

    (1.77" x 4.24" x 4.41")

  • Operation

    3 keys

  • Display

    LCD 6 mm (0.24")

    4-digit

    Bargraph

  • Measuring principle

    Process transmitter

  • Measuring principle

    Contacter

  • Function

    Display

    Power

    Switch

  • Loop power supply

    196...250 V AC

    97...127 V AC

    20...250 V AC/DC

  • Power Supply

    Not defined

  • Input

    1 x analog (U, I)

  • Output

    1 x transmitter power supply

  • Software functions

    Not defined

  • Certificates

    -

  • SIL

    Not defined

  • Display

    LCD 6 mm (0.24")

    4-digit

    Bargraph

  • Interface

    Not defined

  • Dimensions (WxHxD)

    45 x 107.8 x 112 mm (1.77" x 4.24" x 4.41")

Documents / Manuals / Software

Accessories / Spare parts

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