Product Overview

The Yokogawa EP3*A series (including models such as the EP31A) is a specialized Frequency Input Card within the CENTUM I/O architecture. It is designed to acquire high-speed pulse signals from field devices such as turbine flow meters, tachometers, and encoders, converting frequency inputs into accurate digital process variables for the Field Control Station (FCS). This enables precise monitoring of rotational speed, flow rate, and totalized measurements in industrial applications. We supply this unit as 100% brand new, original factory hardware manufactured in the USA to ensure reliable signal acquisition and long-term operational stability.

Technical Specifications

Engineering Advantages

High-Precision Pulse Integration
The EP3*A employs a high-speed counter architecture that minimizes latency, enabling accurate real-time calculation of flow rates and rotational speeds, which is critical for metering and turbine monitoring applications.

Universal Signal Compatibility
It supports multiple input signal types, including square wave, sine wave, and NAMUR-compatible pulses, allowing integration with a wide range of industrial sensors and devices from different manufacturers.

Integrated Signal Conditioning
Built-in filtering eliminates noise, signal bounce, and interference from external electrical sources, preventing false pulse counts and ensuring data integrity.

Low-Power, High-Density Design
The compact form factor and efficient circuitry enable high-density installation in I/O nests while maintaining thermal stability and reducing overall cabinet space requirements.

FAQs

Does the EP3*A provide power to field sensors?
Yes, depending on configuration, it can supply power to certain proximity or NAMUR-compatible sensors. Always verify sensor requirements against the module’s specifications.

Can the EP3*A calculate totalized flow internally?
The module measures frequency and pulse counts, while totalization is typically handled within the CENTUM VP control or application logic to ensure consistency across the system.

How does the module handle excessive input frequency?
It includes overflow detection. If the input exceeds the allowable frequency range, the module triggers an alarm indicating invalid or unreliable input data.

Is the EP3*A hot-swappable?
Yes, it supports hot-swapping in compatible node configurations, allowing replacement without shutting down the system or affecting adjacent modules.