Product Core Brief
- Model: YOKOGAWA AMM42
- Brand: YOKOGAWA
- Series: Yokogawa DCS / Signal Conversion Module
- Core Function: Current transmitter / signal converter that converts measured current into a standard 4–20 mA DC output.
- Product Type: Current Transmitter / Signal Conversion Module
- Key Specs: 3-wire circuit | 4–20 mA DC output | overload protection | short-circuit protection | Yokogawa DCS compatible
- Condition: New Original (New Surplus) / Factory Sealed
Product Introduction
Inconsistent current signals can distort control loops and make DCS readings unreliable. The YOKOGAWA AMM42 is referenced as a Yokogawa current transmitter / signal converter module, designed to convert measured current signals into a standard 4–20 mA DC output for DCS integration.
It uses a 3-wire circuit design and includes protection functions such as overload and short-circuit protection to help maintain stable signal transmission. The module is commonly referenced alongside AMM42T and AMM42-S4 variants, which suggests that suffix and hardware revision should be confirmed before replacement.
Because AMM42 is not one of the standard CENTUM VP I/O module codes such as AAI, ADV, AAT, or AAR, it should be treated as a signal conversion or transmitter-type module rather than a standard analog input card. The exact slot type, mounting form, and interface should be verified from the label.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Model | YOKOGAWA AMM42 |
| Product Type | Current Transmitter / Signal Converter |
| Primary Function | Converts measured current to standard 4–20 mA DC output |
| Circuit Type | 3-wire |
| Output Signal | 4–20 mA DC |
| Protection Features | Overload protection, short-circuit protection |
| Compatible System | Yokogawa DCS — reference only |
| Related Variants | AMM42T, -S4 — reference only |
Key Selling Points & Differentiators
- Converts current signals to standard 4–20 mA DC for DCS compatibility.
- 3-wire transmitter design with overload and short-circuit protection.
- Suitable for Yokogawa DCS signal conversion or transmitter replacement.
- Factory-sealed surplus inventory with visual QA and 12-month warranty.
- Not a standard CENTUM VP analog input card; confirm slot and function before ordering.
Quality Transparency SOP
- Visual inspection: Verify label “AMM42,” suffix, connectors, and housing condition.
- Seal verification: Confirm original anti-static bag, desiccant, and factory labeling.
- Suffix cross-check: Match AMM42, AMM42T, or AMM42-S4 with the replaced unit.
- Output check: Verify 4–20 mA DC output stability under no-load and loaded conditions.
- Protection check: Confirm overload and short-circuit protection behavior before deployment.
- System check: Verify signal recognition and scaling on the connected DCS or instrument.
Technical Risk Avoidance
❗ Confirm the exact model and suffix. AMM42 may appear as AMM42, AMM42T, or AMM42-S4, and these variants may not be directly interchangeable.
❗ This is a current transmitter / signal converter, not a standard CENTUM VP analog input card. Do not substitute it for AAI, ADV, AAT, or AAR modules without confirmation.
❗ Verify the installation location. AMM42 may be used as a signal conversion module rather than a standard FCS I/O slot card.
❗ Check wiring polarity and load impedance. Incorrect wiring or excessive loop resistance can cause 4–20 mA output errors.
❗ Third-party listings sometimes describe AMM42 generically as a “DCS module.” Treat those descriptions as reference only unless confirmed by the label.
Buyer’s FAQ
Is the YOKOGAWA AMM42 a genuine OEM part?
It is supplied as an original Yokogawa module when available, but the exact function should be confirmed from the label before purchase.
What does the AMM42 do?
It functions as a current transmitter / signal converter, converting measured current into a standard 4–20 mA DC output for DCS or instrument integration.
Can it replace AMM42T or -S4?
Only if the label, suffix, wiring, and mounting form match the existing unit. These variants should not be assumed interchangeable.
Is this a standard CENTUM VP analog input card?
No. AMM42 is referenced as a current transmitter / signal converter, not a standard AAI or ADV I/O module.
What warranty do you offer?
A 12-month warranty against manufacturing defects and DOA issues. Damage from incorrect wiring, wrong variant substitution, overload, or incompatible system configuration is not covered.
