EH1*A
EH1*A is a Yokogawa Style A input isolator for 1–5 V signals. EH1*A separates the field input from the receiving circuits within the compatible signal-conditioner arrangement.
Scope note: EH1*A is supplied as 1–5 v input isolator card; terminal hardware, cables and system engineering are selected or verified separately.
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+86 181501176851–5 V Input Isolator Card
EH1*A is a Yokogawa Style A input isolator for 1–5 V signals. EH1*A separates the field input from the receiving circuits within the compatible signal-conditioner arrangement.
Application guidance: Isolation of voltage input loops. Legacy CENTUM signal-conditioner maintenance. Replacement with both output connections identified.
Ordering note: Reproduce EH1*A exactly and confirm the installed hardware, terminal arrangement, project release and site requirements.
| Manufacturer | Yokogawa Electric Corporation |
|---|---|
| Full part number | EH1*A |
| Function | Voltage input isolation |
| Input | 1–5 V DC |
| Outputs | Two 1–5 V DC outputs |
| Input resistance | 1 Mohm; 100 kohms when off |
| Output load | 2 kohms minimum |
| Supply | 24 V DC ±10% |
| Style | A |
| Signal linearization | No square-root extraction |
Before EH1*A replacement, retain the approved configuration and follow the applicable host maintenance and commissioning procedure. Verify the complete hardware and software combination before migration.
EH1*A is documented as a 1–5 V DC input isolator; confirm the source signal before choosing the replacement.
EH1*A provides two 1–5 V output paths. Identify both receiving circuits and their load before disconnecting the existing card.
EH1*A is the input-isolation type. Yokogawa identifies EH5 for square-root extraction, so retain the required signal-processing function when ordering.
For EH1*A, use the matching nest drawing, input-source wiring and receiving I/O connections to verify the slot and terminal assignment.
Review each EH1*A output circuit against the published minimum 2-kohm load and account for any parallel-connected receivers.
For EH1*A migration, record the voltage range, both output destinations, nest, card style and grounding arrangement before selecting the new I/O architecture.
Provide EH1*A, clear tag and connector photos, nest identity, source-signal details and quantity to support a precise replacement match.
Send the exact EH1*A nameplate, quantity, installed Yokogawa system, terminal hardware, destination and clear photos. Availability, condition and compatibility will be confirmed before quotation.
Verify the cited document revision and its applicability to the complete model, style and installed assembly. Family-level documentation does not establish interchangeability for an unlisted suffix.
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