Product Description
The SAI533-H33 is a high-reliability analog output safety module designed for the Yokogawa Electric Corporation ProSafe-RS Safety Instrumented System (SIS) platform.
This module is engineered to transmit precise 4–20 mA safety control signals to critical final control elements such as:
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Emergency shutdown (ESD) valves
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Safety valve positioners
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Actuator control devices
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Fire & Gas (F&G) safety response equipment
The SAI533-H33 is designed for functional safety applications up to SIL3 when deployed in redundant architectures. Dual-redundant operation allows two modules to operate in parallel; if one fails, the other maintains output continuity to prevent process disturbance.
Each channel is individually galvanically isolated, preventing ground loop interference and protecting safety logic circuits from field-side electrical faults.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Designation | SAI533-H33 |
| Primary Function | Safety analog current output |
| Channel Density | 8 isolated output channels |
| Signal Output Range | 1.25 mA – 23 mA |
| Safety Certification | SIL3 (in redundant ProSafe-RS configurations) |
| Output Accuracy | ±48 μA |
| Load Resistance | 230 Ω – 600 Ω at 20 mA |
| Data Refresh Cycle | 40 ms |
| Thermal Stability | ±16 μA per 10°C temperature change |
| Isolation | Channel-to-channel and channel-to-ground |
| HART Support | Yes (pass-through communication) |
| Dimensions | 130 mm × 124 mm × 32.8 mm |
| Weight | 0.34 kg |
Safety Application Scenarios
The SAI533-H33 is widely used in:
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Oil refinery safety shutdown systems
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Offshore platform process protection
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Chemical plant safety interlocks
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Fire & Gas detection response control
It is particularly suited for valve modulation during abnormal process conditions, helping maintain safe process isolation and controlled shutdown behavior.
The module is certified for deployment in hazardous area control cabinets, typically supporting Zone 2 / Division 2 environments when installed in compliant system enclosures.
Frequently Asked Questions
Does the SAI533-H33 support HART communication?
Yes. The module supports HART signal superposition, allowing communication with smart field instruments for diagnostics, calibration, and asset monitoring.
What happens if the loop resistance is outside 230–600 Ω?
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Too high resistance → The module may not achieve full 20 mA output due to voltage saturation.
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Too low resistance → The system may detect a diagnostic fault due to excessive current demand.
Proper loop impedance design is essential for maintaining safety integrity performance.
Is redundant deployment required for SIL3?
Yes. SIL3 safety integrity is typically achieved using redundant module architectures within ProSafe-RS safety configurations.
| 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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