The Siemens FPT-11 Intelligent Thermal Detector is an addressable heat detector designed for compatible Siemens FireFinder XLS and MXL fire alarm systems. It uses a solid-state thermistor to provide fast, accurate thermal sensing with a 135°F (57.2°C) rate-compensated temperature rating.
The FPT-11 combines microprocessor-based processing, electronic address storage, two-wire operation, self-diagnostics, and a multi-color status LED. Siemens identifies the detector under part number 500-095918.
Product Functions
- Provides intelligent addressable heat detection
- Uses solid-state thermistor sensing
- 135°F / 57.2°C rate-compensated operation
- Microprocessor-based design
- Two-wire operation
- Provides electronic device addressing
- Stores its address in EEPROM memory
- Supports DPU programming and testing
- Supports FPI-32 programming and testing
- Provides multi-color LED indication
- Performs automatic self-testing
- Supports compatible relay bases
- Supports compatible audible bases
- Designed for FireFinder XLS and MXL systems
135°F Thermal Detection
The FPT-11 is rated for:
135°F / 57.2°C
rate-compensated thermal detection.
Its electronic thermistor continuously monitors temperature changes and provides temperature information to the compatible fire alarm control panel. The electronic sensing method minimizes the thermal lag associated with traditional mechanical heat detectors.
Rate-Compensated Operation
The FPT-11 uses rate-compensated thermal sensing rather than a simple mechanical fixed-temperature element.
This allows the electronic sensing circuitry to evaluate changing temperature conditions while maintaining its 135°F temperature rating.
Intelligent Addressable Operation
The FPT-11 is a plug-in, two-wire intelligent detector that communicates directly with compatible Siemens fire alarm control equipment.
Each detector operates as an individually identifiable point, allowing the system to identify the exact thermal detector reporting an alarm, fault, or other condition.
Electronic Addressing
The FPT-11 stores its detector address electronically in:
EEPROM memory
This eliminates mechanical addressing methods such as:
- DIP switches
- Rotary address switches
- Programming jumpers
The address can be programmed and verified using compatible Siemens field programming equipment.
DPU & FPI-32 Programming
Compatible programming and testing equipment includes:
DPU — Device Programming Unit
FPI-32 — Field Programmer / Tester
These tools can electronically program the detector address and perform functional tests before the detector is installed.
Multi-Color LED
The FPT-11 incorporates a multi-color detector-status LED.
Typical indication includes:
Green: Normal communication and successful self-test
Amber: Fault or detector condition
Red: Confirmed alarm indication
The LED provides convenient local status information during normal operation, testing, and troubleshooting.
Compatible Detector Bases
Compatible Siemens Series 11 accessories include:
DB-11 — P/N 500-094151 — Standard detector base
DB-11E — P/N 500-094151E — 4.5-inch detector base
DB-X11RS — P/N 500-096125 — Relay base
ADBX-11 — P/N 500-096181 — Audible base
DB-ADPT — P/N 500-094187 — Adapter for DB-3S base
LK-11 — P/N 500-695350 — Detector locking kit.
Electrical & Detection Information
Model: FPT-11
Part Number: 500-095918
Device Type: Intelligent Thermal Detector
Thermal Rating: 135°F / 57.2°C
Detection: Rate Compensated
Sensor: Solid-State Thermistor
Operation: Two-Wire
Processing: Microprocessor Based
Address Storage: EEPROM
Programming: DPU / FPI-32
Status Indicator: Multi-Color LED
Compatible Systems: FireFinder XLS / MXL
Compatible Bases: DB-11 / DB-11E / DB-X11RS / ADBX-11



