Product Description
The Yokogawa SDV521-S33 is a high-integrity digital output module developed for the ProSafe-RS Safety Instrumented System (SIS). It provides four fully isolated digital output channels for driving critical final control elements such as solenoid valves, emergency shutdown valves, and trip actuators.
Designed to meet functional safety requirements up to SIL 3, the SDV521-S33 ensures deterministic and reliable output behavior during safety demands. Unlike standard DCS output modules, it incorporates continuous self-diagnostics and output verification to guarantee correct operation under fault conditions. Seamless integration with Yokogawa’s safety controller and FIO architecture makes it a core component in high-risk industrial environments where system integrity is paramount.
Technical Specifications
| Parameter | Description |
|---|---|
| Model Number | SDV521 |
| Suffix Code | -S33 |
| Output Channels | 4-channel digital output |
| Channel Isolation | Fully isolated |
| Output Type | Current-sourcing (Source type) |
| Rated Load Voltage | 24 V DC |
| Maximum Load Current | 0.5 A per channel |
| Safety Integrity Level | SIL 3 (with redundant configuration) |
| Response Time | ≤ 40 ms (safety-related OFF) |
| Diagnostic Functions | Short-circuit, open-circuit, output read-back |
| Internal Power Consumption | Max. 450 mA @ 5 V DC (system bus) |
| External Power Supply | 24 V DC ±10% |
| Form Factor | FIO (Field Network I/O) compatible |
| Weight | 0.3 kg |
Core Application Scenarios
-
Emergency Shutdown (ESD)
Actuation of shutdown valves to isolate process units during abnormal or hazardous conditions. -
Fire & Gas (F&G) Systems
Driving alarms, beacons, sirens, and fire suppression release devices. -
Burner Management Systems (BMS)
Safe control and interlocking of fuel valves in boilers, heaters, and furnaces.
Technical FAQ
Q: What does the -S33 suffix indicate?
A: The -S33 suffix identifies a specific hardware revision featuring enhanced environmental protection, including conformal coating for resistance to corrosive gases.
Q: Can the SDV521-S33 be used in a redundant configuration?
A: Yes. It supports dual-redundant installation within ProSafe-RS I/O nests to improve availability and fault tolerance.
Q: Does this module require a separate terminal block?
A: Yes. It is typically used with a pressure-clamp terminal block or a dedicated cable interface connected to a terminal board.
| 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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