Product Overview
The Yokogawa EH1A series (including models such as the EH11A) is a high-reliability Input Isolator Card used within the CENTUM control system architecture. It provides galvanic isolation for analog input signals, ensuring that field-side electrical disturbances such as ground loops and noise do not affect the integrity of signals entering the control system. By conditioning and isolating signals such as 4–20 mA and 1–5 V DC, the EH1A helps maintain accurate and stable data acquisition for downstream processing. We supply this unit as 100% brand new, original factory hardware to ensure optimal signal integrity and dependable system performance.
Technical Specifications
| Parameter | Specification |
|---|---|
| Series | EH1*A |
| Dimensions | 7.6 cm × 5.1 cm × 12.7 cm |
| Weight | 0.35 kg |
| Isolation Type | Galvanic isolation (input to output) |
| Input Signal Support | 4–20 mA, 1–5 V DC |
| Mounting | Standard Yokogawa I/O card nest compatible |
| Condition | 100% Brand New Original |
Engineering Advantages
Elimination of Ground Loops
The EH1*A isolates field-side and system-side grounds, preventing unwanted circulating currents caused by potential differences. This ensures accurate signal transmission and reduces measurement errors.
High-Speed Signal Response
The isolation circuitry maintains signal linearity with minimal phase delay, supporting responsive control in fast PID loops where timing precision is critical.
Compact Modular Design
Its compact form factor allows high-density installation within I/O nests, maximizing the number of isolated channels available per cabinet and reducing overall system footprint.
Robust Transient Protection
Integrated surge protection components help shield the control system from voltage spikes, electromagnetic interference, and transient events originating from field wiring.
FAQs
Does the EH1*A require external power?
No, it is typically powered via the system backplane. Depending on configuration, it may also support loop-powered field devices.
How is the EH1*A different from a standard analog input module?
The EH1*A is an isolator/conditioner that prepares signals, whereas analog input modules (e.g., AAI series) perform signal conversion from analog to digital for processing.
Can the EH1*A handle thermocouple signals?
No, it is optimized for 4–20 mA and 1–5 V DC signals. Thermocouple and RTD inputs require dedicated modules designed for low-level signals and cold junction compensation.
Is the EH1*A hot-swappable?
Yes, it supports hot-swapping, allowing replacement while the system remains powered, without affecting adjacent modules in the same nest.
| Quick Quotes | Receive price & availability FAST from our dedicated customer service team. |
|---|---|
| Delivery | Expedited, Freight, And International Shipping Available. |
| Condition | 100% New with Original Package |
| Payment | We accept American Express, Discover, MasterCard, PayPal, and Visa. Our site is secured by RapidSSL. |
| Shipping Port | ShangHai, Xiamen |
| Warranty | 12 Months |
| Q: Is Our Pricing Competitive? |
| A: Yes, we collaborate with over 50 countries worldwide. As a top supplier in China, we offer significant discounts based on market trends. |
| Q: What Is the Warranty Period? |
| A: All our new and original products come with a standard one-year warranty. |
| Q: What Payment Methods Do We Accept? |
| A: We require 100% T/T (Telegraphic Transfer) payment before shipping. For items with a lead time, a 30% deposit is needed upfront, and the remaining 70% is due before shipping. If you have a representative in China, you can arrange an RMB transfer through them. |
| Q: What Shipping Methods Do We Use? |
| A: We primarily use FedEx, DHL, UPS, and BRE for shipping. If you have an account with any of these carriers, you can handle shipping directly. We also offer free shipping to China-based freight forwarders. |
| Q: What Is Our Delivery Time? |
| A: Delivery usually takes 1-3 days after receiving the initial payment. For items with a lead time, shipping will occur according to the specified schedule. |
| Q: How Do We Package the Goods? |
| A: We ensure safe packaging with multiple layers of protection. Products are first placed in their original boxes and sealed with labels. A layer of bubble wrap is then added for collision protection during transit. Finally, the items are packed securely in durable boxes. |
| Q: How Can Customers Contact Us and Request a Quote? |
| A: You can reach out to us via email, WhatsApp, WeChat, Skype, or your preferred communication platform. Contact us with your needs, and we'll provide a prompt, customized quote. |
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