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        • Lifecycle status

          Active / Available from OEM
          Apter Power supports EA1*B identification, documentation review and quotation.

        EA1*B

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Yokogawa EA1*B accepts a 4 to 20 mA two-wire transmitter loop, supplies the field transmitter and produces two isolated 1 to 5 V DC outputs. It is used to condition powered process signals for CENTUM control inputs.
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        Ships by Thursday, October 29
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
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        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for EA1*B

        • Manufacturer:
          Yokogawa
        • Part Number:
          EA1*B
        • Product Family:
          Yokogawa DCS system
        • Product Type:
          Two-Wire Transmitter Input Card
        • Stock:
          1
        • Input signal:
          4 to 20 mA DC, two-wire transmitter
        • Input resistance:
          250 Ω
        • Transmitter supply:
          25 to 28 V DC
        • Supply current limit:
          25 to 35 mA
        • Output signal:
          1 to 5 V DC, two outputs
        • Isolation:
          Input/output/power/ground isolated
        • Card supply:
          24 V DC ±10%
        • Maximum current consumption:
          80 mA
        • Operating temperature:
          0 to 50 °C
        • Relative humidity:
          5 to 90% RH, non-condensing
        • Style code:
          B
        • Allowable input current:
          40 mA DC
        • External input resistance limit:
          RL = (20 − minimum transmitter operating voltage) / 0.02 Ω
        • Input linearization:
          None
        • Output resistance:
          1 Ω maximum
        • Minimum output load:
          2 kΩ
        • Accuracy rating:
          Within ±0.1% of span
        • Second-output accuracy:
          ±0.2% deviation from output 1
        • Isolation resistance:
          100 MΩ at 500 V DC between signal and power circuits
        • Input-to-output withstand voltage:
          1,500 V AC for 1 minute
        • Output-to-power withstand voltage:
          500 V AC for 1 minute
        • Ambient-temperature effect:
          Maximum ±0.2% of span per 10 °C change
        • Supply-voltage effect:
          Maximum ±0.1% of span for 24 V DC ±10%
        • Mounting method:
          Special signal-conditioner nest through backboard connector
        • Process wiring:
          M4 screw terminals in the signal-conditioner nest
        • Weight:
          0.154 lbs (0.07 kg)
        • Estimated shipping dimensions:
          7.3 x 2.4 x 11.5 cm
        • Tariff Code:
          Please confirm the destination before shipping.
        • Country of origin:
          Japan
        • Place of shipment:
          Xiamen,Fujian,China
        By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

        More Information

        Overview Manuals Applications Monitoring Connectivity Protection

        Features:

        • Powers and measures a two-wire 4 to 20 mA transmitter loop.
        • Converts the loop current into two isolated 1 to 5 V DC outputs.
        • Limits the field-supply current to protect the connected loop.
        The B-style card includes an integral transmitter supply as part of its ordered function.

        It combines loop excitation, current sensing and isolated voltage reproduction on one conditioner channel.

        Field polarity and the absence of a competing external supply must be confirmed before connection.

        Apter Power can review sourcing, documentation and system matching for EA1*B.
        Verified resources for Yokogawa EA1*B: Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
        • Pressure and differential-pressure transmitters can be powered and conditioned for the control system.
        • Flow, level and analytical instruments using two-wire loops can feed dual voltage destinations.
        • Legacy CENTUM cabinets can maintain established transmitter wiring through an exact-style card exchange.
        • The 250 ohm input converts the 4 to 20 mA loop current into a measurable internal signal.
        • Two voltage outputs reproduce the same process variable for separate receiving circuits.
        • A current-limited transmitter supply supports the field device and restricts fault energy.
        • The field side is wired as a powered two-wire current loop.
        • System-side outputs use the documented 1 to 5 V DC connections.
        • Shield and return conductors should follow the installed cabinet grounding practice.
        • The built-in field supply is limited between 25 and 35 mA.
        • Galvanic isolation separates input, outputs, power and ground domains.
        • Loop polarity checks prevent reverse connection of the transmitter electronics.
        Description
        EA1*B combines loop power and signal conversion for a two-wire 4 to 20 mA transmitter. Its 250 ohm input develops the measurement voltage while the card supplies the connected field device from a protected 25 to 28 V DC source.

        The conditioned value appears on two 1 to 5 V DC outputs, allowing one process variable to feed separate system destinations. Galvanic separation keeps the field loop, outputs, power and ground from sharing an unintended current path.

        Transmitter current demand, polarity and cable shield termination must be verified before connection. The card cannot be substituted blindly for an externally powered current-input conditioner because its loop-supply function changes the wiring arrangement.
        Alternative Names
        EA1*B Yokogawa EA1*B EA1 Star B EA1STARB EA1B EA1*B Two-Wire Transmitter Input Card Yokogawa CENTUM Signal Conditioner Cards Yokogawa EA1*B Two-Wire Transmitter Input Card
        Technical notes
        Observe loop polarity on Yokogawa EA1*B and never parallel an external transmitter supply with the card's protected 25 to 28 V source.
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        FAQS

        The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
        VIEW ALL FAQS
        How does Yokogawa EA1*B energize a field transmitter?
        It provides a protected 25 to 28 V DC loop supply with a 25 to 35 mA current limit.
        What system signals are available from Yokogawa EA1*B?
        Two isolated 1 to 5 V DC outputs represent the incoming 4 to 20 mA measurement.
        Which process instruments are appropriate for Yokogawa EA1*B?
        Two-wire pressure, flow, level and analytical transmitters are typical applications.
        How is Yokogawa EA1*B supply availability checked without relying on a generic family code?
        Use the full EA1*B style identity and confirm the present card and cabinet interface at quotation time.
        What wiring conflict must be avoided when replacing Yokogawa EA1*B?
        Do not leave an external loop supply connected in parallel with the card's integrated transmitter source.
        What loop information should accompany a Yokogawa EA1*B enquiry?
        Provide transmitter type, loop polarity, existing terminal map, quantity and destination.

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