The Siemens OP121 is a conventional photoelectric smoke detector. Its full part number is S54372-F1-A1. The detector belongs to Siemens’ legacy Pyrotronics 6193 conventional product family.
First, the optical chamber uses the light-scattering principle. Then, an infrared source detects smoke particles entering the chamber. As a result, slow-smouldering fires get caught early — often before flames develop. Therefore, the OP121 suits offices, hotels, healthcare, and light commercial spaces.
Microprocessor Features of the Siemens OP121
The OP121 carries on-board microcontroller logic and surface-mount construction. Specifically, this gives it self-diagnostic and auto-sensitivity capabilities. In addition, the detector reports status through a three-color LED on the head. As a result, technicians can read the detector’s health locally — no extra test gear is required.
Also, the magnet-test feature lets installers verify wiring and panel connection. However, the OP121 is a conventional device. It is not programmable and does not carry a unique address on a loop.
Key Features
- Photoelectric (light-scattering) smoke sensing
- Microprocessor-controlled self-diagnostic circuitry
- Auto-sensitivity feature for dynamic sensitivity verification
- Three-color status LED visible on the detector
- Magnet-test feature for in-place wiring verification
- Surface-mount electronics for high reliability
- Mounts to the Siemens DB-11 detector base (sold separately)
Approvals
The OP121 is UL 268 and ULC S529 listed. In addition, it is Factory Mutual (FM) approved. It also carries California State Fire Marshal (CSFM) approval.
Compatible Panels
The OP121 is commonly found on Siemens conventional fire alarm panels. Specifically, this includes the TXR-320, System 3, and SXL platforms.
Order or Get Application Help
Since 2002, Life Safety Consultants has stocked legacy Siemens / Pyrotronics conventional detectors. To order the Siemens OP121 or confirm fit with your existing panel, call 1-888-557-0558. Alternatively, email sales@lifesafetycom.com.
For more information, contact the Life Safety Consultants team at (888) 557-0558, or email us at: sales@lifesafetycom.com
Additional information
| Weight | .2 lbs |
|---|---|
| Dimensions | 4 × 4 × 2 in |
| Condition | New |
| Part Type | Photoelectric, Smoke Detector |
| Manufacturers | Siemens |
| Compatible Panels | Conventional panels (2-wire and 4-wire IDC, panel-agnostic within voltage spec) |
| Compatible Bases | N/A – conventional detector, see panel documentation for base/mounting |
| Cross Reference | S54370-C5-A1, S54370 series |
| Detection | Photoelectric conventional, Circuit: 2-wire or 4-wire IDC, Part #: S54370-C5-A1, Not addressable |
