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EC0*A

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Yokogawa EC0*A is a control-output isolator that accepts 4 to 20 mA and drives one isolated 4 to 20 mA field loop. Load-open detection supervises the output path for disconnected wiring.
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Technical specifications for EC0*A

  • Manufacturer:
    Yokogawa
  • Part Number:
    EC0*A
  • Product Family:
    Yokogawa DCS system
  • Product Type:
    Current Output Isolator Card
  • Stock:
    1
  • Input signal:
    4 to 20 mA DC
  • Equivalent input resistance:
    250 Ω
  • Output signal:
    4 to 20 mA DC, one output
  • Maximum output load:
    750 Ω
  • Load-open detection:
    Provided
  • Isolation:
    Input/output/power/ground isolated
  • Supply voltage:
    24 V DC ±10%
  • Maximum current consumption:
    60 mA
  • Operating temperature:
    0 to 50 °C
  • Relative humidity:
    5 to 90% RH, non-condensing
  • Style code:
    A
  • Allowable input current:
    40 mA DC
  • Output points:
    1
  • Minimum output resistance:
    500 kΩ
  • Accuracy rating:
    Within ±0.2% of span
  • Isolation resistance:
    100 MΩ at 500 V DC between output, input and power circuits
  • Output-to-input withstand voltage:
    1,500 V AC for 1 minute
  • Input-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
  • Recommended arrester:
    AR-HA for the load-open detection circuit
  • 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 Control Diagnostics Integration

Features:

  • Isolates a 4 to 20 mA control command from its field load.
  • Drives one current loop with as much as 750 Ω total burden.
  • Detects an open output circuit for maintenance visibility.
The A-style execution is intended for current command isolation rather than voltage reproduction.

It drives the receiving loop while supervising whether the load path remains electrically complete.

Cable resistance, receiver burden and output polarity must be checked as one loop before service.

Apter Power can review sourcing, documentation and system matching for EC0*A.
Verified resources for Yokogawa EC0*A: 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.
  • Control-valve positioners can receive an isolated current command from the CENTUM output system.
  • Remote analog recorders or converters can be driven across long field wiring within the burden limit.
  • Output-circuit supervision helps maintenance identify a broken wire or disconnected field instrument.
  • The channel transfers one 4 to 20 mA command to the field-side loop.
  • A 750 ohm maximum burden accommodates receiver and cable resistance together.
  • Load-open detection distinguishes a disconnected loop from a normal current command.
  • An open output path is detected by the conditioner electronics.
  • Loop-current checks can separate wiring faults from controller command problems.
  • Terminal polarity and receiver continuity are primary checks after an output alarm.
  • The total burden must be calculated before the field loop is connected.
  • Shield termination should follow the cabinet's established analog-grounding practice.
  • The card requires a 24 V DC supply within ±10% for specified operation.
Description
EC0*A receives a standard 4 to 20 mA command through a 250 ohm equivalent input. Its isolated output recreates the current for a field load up to 750 ohms.

The conditioning stage separates the controller command circuit from the actuator or remote receiving loop. Integrated load-open detection lets the system recognize a broken or disconnected output path instead of treating it as an ordinary command value.

Available loop resistance, cable drop and receiver burden must be added before installation. A voltage-output isolator is not a direct substitute because the field device and diagnostics depend on a closed current loop.
Alternative Names
EC0*A Yokogawa EC0*A EC0 Star A EC0STARA EC0A EC0*A Current Output Isolator Card Yokogawa CENTUM Signal Conditioner Cards Yokogawa EC0*A Current Output Isolator Card
Technical notes
Calculate total loop burden before installing Yokogawa EC0*A; cable and receiver resistance together must not exceed the 750 Ω output limit.
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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.
How much loop burden can Yokogawa EC0*A drive?
The output supports a total load of up to 750 Ω.
What diagnostic behavior distinguishes Yokogawa EC0*A from a basic isolator?
It includes load-open detection for a disconnected or broken output circuit.
Which final-control devices can use Yokogawa EC0*A?
Current-input valve positioners, converters and remote recorders are representative loads.
How should Yokogawa EC0*A be specified for a sourcing check?
Identify the A-style current-output card and the host signal-conditioner assembly, then request current availability.
What must be recalculated before a Yokogawa EC0*A replacement?
Add cable resistance and receiver burden and ensure their total remains within 750 Ω.
What field-loop evidence is useful for a Yokogawa EC0*A quotation?
Send the receiver type, measured burden, terminal drawing, quantity and destination.

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