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The Siemens FDOT421 Multi-Criteria Fire and Smoke Detector P/N: S54320-F6-A1 is an intelligent addressable detector designed for compatible Siemens fire alarm systems. It combines photoelectric smoke sensing and electronic heat detection to provide multi-criteria fire detection with strong nuisance-alarm rejection. Siemens officially identifies the FDOT421 as an Addressable Multi-Criteria Fire Detector.
The detector’s microprocessor continuously evaluates smoke, temperature, sensitivity, and internal electronics. It can provide combined smoke/heat detection as well as a separate heat alarm source through compatible Siemens control equipment.
The FDOT421 combines information from its photoelectric smoke sensor and thermal sensor to evaluate developing fire conditions.
This multi-criteria architecture allows the detector to respond to a broad range of combustion products while improving rejection of nuisance sources such as:
The combined sensing approach provides more information for alarm decisions than a basic single-sensor smoke detector.
The optical sensing chamber monitors airborne smoke particles.
As smoke enters the chamber, changes in the optical signal are evaluated by the detector’s onboard electronics. This smoke information can then be combined with thermal data to determine the appropriate system response.
The detector continuously monitors smoke within its chamber as well as whether its sensitivity remains within the specified range.
The FDOT421 provides electronic heat detection in addition to smoke sensing.
Fixed Temperature: 135°F / 57°C
Rate-of-Rise: 15°F per minute / 8.3°C per minute
Compatible Siemens systems can treat the detector’s combined smoke/heat response and heat-only response as separate programmable alarm sources.
The FDOT421 uses electronic addressing rather than mechanical rotary or DIP switches.
Supported address range:
001–252
Detector addresses are programmed using the Siemens DPU Device Programming Unit. The DPU can also be used for individual detector sensitivity testing and diagnostics.
Compatible FDOT421 product versions incorporate line-isolation functionality.
When operating in isolator mode with supported Siemens control equipment, the detector can help isolate a short circuit on the signaling line while allowing unaffected portions of the loop to continue operating.
Siemens specifies that isolator mode applies to FDOT421 product version 17 and later and should not be used on earlier versions.
The FDOT421 incorporates a status LED capable of displaying:
Green
Yellow
Red
The detector’s microprocessor monitors smoke conditions, sensitivity, internal sensors, and electronics, with the LED providing local status information according to detector and system conditions.
Compatible Siemens detector bases include:
DB-11 — Standard low-profile base
DB-11E — Smaller-diameter detector base
DB2-HR — Relay detector base
The separate plug-in base design allows the detector head to be serviced or replaced without disturbing the installed field wiring.
Model: FDOT421
Part Number: S54320-F6-A1
Device Type: Multi-Criteria Fire and Smoke Detector
Smoke Sensing: Photoelectric
Heat Sensing: Fixed Temperature / Rate-of-Rise
Fixed Temperature: 135°F / 57°C
Rate-of-Rise: 15°F/min / 8.3°C/min
Input Voltage: 16–30 VDC
Maximum Standby Current: 250 µA
Maximum Alarm Current: 410 µA
Address Range: 001–252
Operating Temperature: 32°F to 100°F / 0°C to 38°C
Relative Humidity: 0–95%, non-condensing
Status Indicator: Tri-color LED.
| Weight | 2 lbs |
|---|---|
| Dimensions | 5 × 5 × 5 in |
| Brand |
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The Siemens FDOT421 Multi-Criteria Fire and Smoke Detector P/N: S54320-F6-A1 is an intelligent addressable detector designed for compatible Siemens fire alarm systems. It combines photoelectric smoke sensing and electronic heat detection to provide multi-criteria fire detection with strong nuisance-alarm rejection. Siemens officially identifies the FDOT421 as an Addressable Multi-Criteria Fire Detector.
The detector’s microprocessor continuously evaluates smoke, temperature, sensitivity, and internal electronics. It can provide combined smoke/heat detection as well as a separate heat alarm source through compatible Siemens control equipment.
The FDOT421 combines information from its photoelectric smoke sensor and thermal sensor to evaluate developing fire conditions.
This multi-criteria architecture allows the detector to respond to a broad range of combustion products while improving rejection of nuisance sources such as:
The combined sensing approach provides more information for alarm decisions than a basic single-sensor smoke detector.
The optical sensing chamber monitors airborne smoke particles.
As smoke enters the chamber, changes in the optical signal are evaluated by the detector’s onboard electronics. This smoke information can then be combined with thermal data to determine the appropriate system response.
The detector continuously monitors smoke within its chamber as well as whether its sensitivity remains within the specified range.
The FDOT421 provides electronic heat detection in addition to smoke sensing.
Fixed Temperature: 135°F / 57°C
Rate-of-Rise: 15°F per minute / 8.3°C per minute
Compatible Siemens systems can treat the detector’s combined smoke/heat response and heat-only response as separate programmable alarm sources.
The FDOT421 uses electronic addressing rather than mechanical rotary or DIP switches.
Supported address range:
001–252
Detector addresses are programmed using the Siemens DPU Device Programming Unit. The DPU can also be used for individual detector sensitivity testing and diagnostics.
Compatible FDOT421 product versions incorporate line-isolation functionality.
When operating in isolator mode with supported Siemens control equipment, the detector can help isolate a short circuit on the signaling line while allowing unaffected portions of the loop to continue operating.
Siemens specifies that isolator mode applies to FDOT421 product version 17 and later and should not be used on earlier versions.
The FDOT421 incorporates a status LED capable of displaying:
Green
Yellow
Red
The detector’s microprocessor monitors smoke conditions, sensitivity, internal sensors, and electronics, with the LED providing local status information according to detector and system conditions.
Compatible Siemens detector bases include:
DB-11 — Standard low-profile base
DB-11E — Smaller-diameter detector base
DB2-HR — Relay detector base
The separate plug-in base design allows the detector head to be serviced or replaced without disturbing the installed field wiring.
Model: FDOT421
Part Number: S54320-F6-A1
Device Type: Multi-Criteria Fire and Smoke Detector
Smoke Sensing: Photoelectric
Heat Sensing: Fixed Temperature / Rate-of-Rise
Fixed Temperature: 135°F / 57°C
Rate-of-Rise: 15°F/min / 8.3°C/min
Input Voltage: 16–30 VDC
Maximum Standby Current: 250 µA
Maximum Alarm Current: 410 µA
Address Range: 001–252
Operating Temperature: 32°F to 100°F / 0°C to 38°C
Relative Humidity: 0–95%, non-condensing
Status Indicator: Tri-color LED.
| Weight | 2 lbs |
|---|---|
| Dimensions | 5 × 5 × 5 in |
| Brand |
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