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      EH-PT4

      Four-Channel RTD Input Module
      In Stock
      Ships by Thursday, November 12
      Fast Shipping Available
      Product image is representative; revision or series may vary. Contact us to request a specific version.

      Product Describe：

      Hitachi EH-PT4 is a four-channel resistance-temperature-detector input module for EH-150 controllers. It converts Pt100 or Pt1000 sensor resistance into temperature values for PLC monitoring and control.

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      Technical specifications for EH-PT4

      • Manufacturer:
        Hitachi
      • Product Category:
        PLC Systems
      • Spare Part Number:
        EH-PT4
      • Estimated shipping dimensions:
        2.5x10.2x10.2cm
      • Weight:
        0.18 kg
      • Tariff Code:
        8537101190
      • Counliy of origin:
        Japan
      • Input type:
        Pt100 / Pt1000 RTD
      • Input channels:
        4
      • Conversion resolution:
        Signed 15 bit
      • Pt100 range 1:
        -20 to +40 degC
      • Pt100 range 2:
        -50 to +400 degC
      • Pt1000 range:
        -50 to +400 degC
      • Conversion time:
        Approximately 0.5 s per 4 inputs
      • Pt100 accuracy at 25 degC:
        +/-0.1 degC or +/-0.6 degC by range
      • Pt1000 accuracy at 25 degC:
        +/-0.8 degC
      • Isolation:
        Input-to-internal photocoupler isolation
      • Inter-channel isolation:
        None
      • Terminal block:
        Removable M3
      • Recommended wiring:
        3-core shielded cable
      • Maximum lead resistance:
        2 Ohm current terminal to ground
      • Internal current:
        160 mA approximately at 5 V DC
      • External supply:
        24 V DC +/-10%, 70 mA maximum
      View as PDF Ask for Quote

      Information

      Overview Manuals Common Applications Product Precautions
      Hitachi EH-PT4 is a four-channel resistance-temperature-detector input module for EH-150 controllers. It converts Pt100 or Pt1000 sensor resistance into temperature values for PLC monitoring and control.
      • Measures four platinum resistance-temperature detector channels
      • Linearizes Pt100 or Pt1000 resistance into signed temperature data
      • Transfers temperature values through the EH-150 I/O backplane
      • Supports open-circuit and wiring verification at the removable terminal block

      EH-PT4 installs with EH-150 base and CPU, Pt100 or Pt1000 sensors, 24 V DC field supply, three-core shielded field cables in an engineered Hitachi EH-150 programmable controller configuration.

      The commissioning workflow covers installed-hardware matching, controlled start-up and functional verification for this four-channel rtd input module.

      Important Notice: Confirm the complete EH-PT4 marking, installed-system configuration, field connections and controlled functional test before commissioning or replacement.

      Apter Power EH-PT4 Manuals and Guides
      Apter Power EH-PT4 Product Technical Reference PDFHitachi EH-PT4 Official Manual PDF
      The first document is an Apter Power model-specific technical reference. The second supports model-specific installation, configuration and engineering verification.
      Process-vessel temperature measurementMeasures four platinum resistance-temperature detector channels
      Machine bearing temperature monitoringLinearizes Pt100 or Pt1000 resistance into signed temperature data
      Oven and dryer thermal controlTransfers temperature values through the EH-150 I/O backplane
      Utility skid multi-point RTD acquisitionSupports open-circuit and wiring verification at the removable terminal block
      Read the applicable Hitachi installation instructions before work. Verify EH-PT4 and the installed Hitachi EH-150 programmable controller configuration.
      1Confirm EH-PT4 and the assigned EH-150 base position before work.
      2Isolate the external 24 V DC supply and associated process interlocks.
      3Keep all three RTD conductors together in a shielded cable.
      4Do not introduce inter-channel potential because the four inputs are not mutually isolated.
      5Short unused terminals in the arrangement specified by the Hitachi guide.
      6Check lead resistance and terminal tightness before module insertion.
      7Simulate at least two resistance points on every commissioned channel.
      8Verify engineering units, alarm thresholds, and open-circuit diagnostics before service.

      Technical notes

      Select the Pt100 or Pt1000 range before commissioning, use three-wire shielded connections, short unused inputs as instructed, and verify channel scaling against a traceable resistance source.

      FAQ View All FAQ

      • How should the field connections for EH-PT4 be recorded before replacement?
        Record terminal or connector identity, polarity, shield, cable tag, channel assignment, and the as-found diagnostic state before disconnecting EH-PT4.
      • What isolation is required before installing EH-PT4?
        Place process-vessel temperature measurement in the approved maintenance state, isolate every applicable power, signal, and stored-energy source, and prove the work area safe.
      • Which configuration check is essential when commissioning EH-PT4?
        Restore only the approved model-specific channel, range, address, scale, or interface settings and compare them with the physical installation before enabling the process function.
      • How can an engineer function-test EH-PT4 after installation?
        Apply a controlled input, reference, or limited output appropriate to four-channel rtd input module, observe the system indication and diagnostics, and confirm the intended process response.
      • What should be checked if EH-PT4 reports an unstable or incorrect value?
        Check seating, supply, grounding, shielding, matched components, mechanical installation, and the signal path before changing configuration or replacing additional hardware.
      • Can EH-PT4 be replaced by a visually similar model without review?
        No. Verify the complete part number, electrical execution, connector arrangement, companion hardware, and approved software or rack configuration.
      • What commissioning evidence should be retained for EH-PT4?
        Retain the full EH-PT4 identity, as-left wiring and settings, measured functional-test results, final diagnostics, and authorization to return the affected equipment to service.
      • Which installed hardware must be matched before fitting EH-PT4?
        Match the complete EH-PT4 marking to EH-150 base and CPU and Pt100 or Pt1000 sensors, then confirm the assigned Hitachi EH-150 programmable controller position and approved system configuration.
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