M sensor
Self-powered Fixed-temperature Fire Detection Sensor
A fire detection sensor that sends a signal using the heat of rising temperature, with no wiring or batteries
The world's first self-powered fixed-temperature fire detection sensor that needs no wiring or batteries. When the temperature rises, the SMA expands or a glass bulb breaks, moving the sensor, and that force generates electricity to send a signal. So it attaches directly in tight spaces, industrial sites and aging facilities where installation is difficult.
- PowerSelf-powered (no battery)
- Dust · water protectionIP57
- Transmission rangeapprox. 100 m (open field)
- Operating temperatureapprox. 75–85 ℃ (SMA type) · 90 ℃ (glass bulb type)
- ReuseSMA type can be reused after cooling
01How it works
- Heat (fire · temperature rise)
The sensing element reacts when the set temperature is reached.
- Thermal energy → kinetic energy
The SMA expands, or the liquid in the glass bulb expands and breaks the glass tube.
- Self-powered generation · RF transmission
That movement generates power to send the signal.
- Real-time monitoring
The situation is communicated via Signal Monitor, Sensor Hub, PC and text messages.
02Features
Operates on thermal energy with no wires or batteries.
Attaches in places that were hard to install and manage, such as distribution boards, switchboards and cable ducts.
Suitable for various environments, including outdoor switchboards.
Alerts on the PC screen and by text message via the signal receiver.
The SMA type can be used again once the temperature drops.
03Types
When the temperature rises, the SMA expands and actuates the sensor. Operates at approx. 75 – 85 ℃ or above and is reusable.
A glass bulb containing a special liquid whose volume changes with temperature breaks at approx. 90 ℃ or above to actuate the sensor. Not reusable.
The sensing element is 11 cm longer than the standard type to detect temperature rises deep inside cable ducts and in narrow spaces.
A type that detects the temperature (around 80 ℃) of switchgear busbars.
04System configuration
Fixed-temperature Fire Detection Sensor — SMA standard typeMWSF-100
RepeaterMWSR2-900 · Optional
Signal MonitorMWSM-700
Sensor HubMWSH-300
PC monitoringSensor location · detection history
Text alertsManager's mobile phoneRanges are based on open field with no obstacles. Each added repeater extends the range by approx. 1 km.
05Specifications
Fixed-temperature Fire Detection Sensor — SMA standard type
Model MWSF-100
| Size | W77 × D56 × H47.7 mm |
|---|---|
| Weight | 82 g |
| Frequency | 920.700 MHz (FSK) |
| Transmission range | approx. 100 m (open field) |
| Operating temperature | approx. 75 – 85 ℃ or above |
| Power | Self-powered (no battery) |
| Dust · water protection | IP57 |
Fixed-temperature Fire Detection Sensor — glass bulb type
Model MWSF-110
| Size | W77 × D56 × H68 mm |
|---|---|
| Weight | 82 g |
| Frequency | 920.700 MHz (FSK) |
| Transmission range | approx. 100 m (open field) |
| Operating temperature | approx. 90 ℃ or above |
| Power | Self-powered (no battery) |
| Dust · water protection | IP57 |
Fixed-temperature Fire Detection Sensor — SMA special type
Model MWSF-100 (Long)
| Size | W77 × D56 × H164 mm |
|---|---|
| Weight | 121 g |
| Frequency | 920.700 MHz (FSK) |
| Transmission range | approx. 100 m (open field) |
| Operating temperature | approx. 75 – 85 ℃ or above |
| Power | Self-powered (no battery) |
| Dust · water protection | IP57 |
Fixed-temperature Fire Detection Sensor — SMA busbar type
Model MWSF-100 (Busbar)
| Size | W77 × D56 × H140 mm |
|---|---|
| Weight | 200 g |
| Frequency | 920.700 MHz (FSK) |
| Transmission range | approx. 100 m (open field) |
| Operating temperature | approx. 75 – 85 ℃ or above |
| Power | Self-powered (no battery) |
| Dust · water protection | IP57 |
Receiving · monitoring devices used together
Repeater
Model MWSR2-900
| Size | W115 × D115 × H30 mm |
|---|---|
| Weight | 167 g |
| Frequency | 920.7 / 447.9 MHz (FSK) |
| Antenna | External antenna × 2 |
| Tx/Rx range | approx. 1 km (open field) |
| Range extension | +approx. 1 km (open field) |
| Display | FND 3-digit, LED (Rx · Tx · Power) |
| Power | DC 12 V 1 A adapter |
Signal Monitor
Model MWSM-700
| Size | W258 × D107 × H34 mm |
|---|---|
| Weight | 497 g |
| Frequency | 920.7 / 447.9 MHz (FSK) |
| Antenna | External antenna × 2 |
| Reception range | approx. 1 km (open field) |
| ID registration | max. 999 |
| Signal storage | Up to 10 overlapping signals |
| Display | FND 5-digit LED |
| External terminals | RS-485, beacon light, speaker, power |
| Power | DC 12 V 1 A adapter |
Sensor Hub
Model MWSH-300
| Size | W100 × D100 × H26 mm |
|---|---|
| Weight | 145 g |
| Frequency | 920.7 / 447.9 MHz (FSK) / Wi-Fi |
| Antenna | External antenna × 2, Internal antenna × 1 |
| Reception range | approx. 1 km (open field) |
| Recipient numbers | max. 5 |
| Display | FND 4-digit, Power · Rx · Tx LED |
| External terminals | Power, TCP/IP, LAN (RS485) |
| Power | DC 9 V 1 A adapter |
Specifications are subject to change without notice for performance improvement.
06Applications
Integrated safety monitoring together with valve · door sensors and emergency bells
Detects internal temperature rises before they spread into major fires
Detects cable duct fires that lead to major losses, like the 2018 utility tunnel fire
Where there is no fire detector or a specific spot is a concern
Installation sites
Field installation photos14
Applicable platforms
A disaster monitoring system that monitors the temperature, doors and emergencies of switchgear using self-powered sensors
Distribution Panel Power Safety PlatformA disaster monitoring system that monitors emergency, fire and door information in extra-high-voltage switchgear using self-powered sensors
Cable Joint Power Safety PlatformA disaster prevention system that remotely monitors fire detection sensor data from cable joints
Data Center & ESS Power Safety PlatformA system that monitors signs of fire and electrical leakage in electrical rooms of data centers and large buildings via SCADA, using self-powered sensors and an insulation monitoring device
07Certifications · patents
KC Conformity Registration — Fixed-temperature Fire Detection SensorR-R-M1p-MWSF-100 · 2021-08-18
FCC — Fixed-temperature Fire Detection SensorFCC ID 2BTDM-MWSF-100 · 2026
IECEx international explosion-proof certification (intrinsic safety)IECEx ICR 24.0005X · 2024-09-10
Self-powered, power-free fixed-temperature detection transmitting/receiving systemRegistered (Korea)
Self-powered glass bulb-type wireless fixed-temperature detectorRegistered (Korea)
Self-powered, power-free fixed-temperature detection transmitting/receiving system (Japan)Registered (Japan)
Self-powered, power-free fixed-temperature detection transmitting/receiving system (US)Registered (US)
Self-powered, power-free fixed-temperature detection transmitting/receiving system (PCT)PCT international application
08Materials · videos
09FAQ
QAt what temperature does it detect?
The SMA type operates at approx. 75 – 85 ℃ or above, and the glass bulb type at approx. 90 ℃ or above. The busbar · cable joint platforms alarm at temperatures of around 80 ℃ or above.
QDoes it need replacing after it operates once?
The SMA type can be used again once the temperature drops. The glass bulb type operates by breaking its glass tube and cannot be reused.
QDoes it replace fire detectors for fire protection?
This sensor is for supplementary monitoring that gives early warning of temperature rises in places where conventional detectors are hard to install, such as switchboards and cable ducts. Please review fire protection equipment standards together according to site conditions.
CONTACT MPIA
Self-powered Fixed-temperature Fire Detection Sensor
A fire detection sensor that sends a signal using the heat of rising temperature, with no wiring or batteries