M sensor
Self-powered Valve Open/Close Detection Sensor
A power-free sensor added to existing valves that reports open/closed status wirelessly
The world's first self-powered valve open/close detection sensor that needs no wiring or batteries. When the valve's rotation reaches a set stroke, its kinetic energy generates power and the sensor sends a signal distinguishing open from closed. Installed as an add-on to existing valves with no wiring work, it remotely monitors valve status that is hard to check by eye.
- PowerSelf-powered (no battery)
- Dust · water protectionIP57
- Transmission rangeapprox. 100 m (open field)
- InstallationAdd-on attached to existing valves
- Explosion-proof designIECEx intrinsic safety (Ex ib IIB T4 Gb)
01How it works
- Valve operation
The operator fully closes or opens the valve.
- Kinetic energy → electricity
The valve's rotation makes the sensor generate power.
- Open / closed signal
The status is distinguished and sent as an RF signal.
- PC · LCD · SCADA
A valve that is not closed keeps triggering a warning on screen.
02Features
Just attach the module to the valve already in use. Installation costs and construction time are greatly reduced.
Low-power self-powered signals allow safe use at gas and chemical sites, with an IECEx intrinsically safe explosion-proof design.
Also used on indoor and outdoor drain valves.
Valve icons are placed on the MAP, and when a valve moves, alerts are given by pop-up, voice and text message.
Through consultation, we develop self-powered modules to fit the customer's valve specifications.
Benefits of installation
- Remote checking of valve status that is hard to verify by eye
- Prevention of mis-operation caused by human error
- Attached to existing valves — applied without complex installation or construction
- Low-power self-powered, dust- and waterproof for safe use on site
03Types
Continuously monitors gas valve status at gas companies, chemical companies and substation GIS facilities. Supplied to power utility GIS substations.
Monitors opening and closing of fluid (PVC) valves in chemical processing plants that do not use iron or cast steel valves. Being applied to semiconductor process valves.
Monitors valve opening and closing in purification plant wastewater, slurry, mining, coal and steel pipelines.
Monitors valve opening and closing at oil refining, gas, petrochemical, power plant, fluid separation and drainage sites.
04System configuration
Gas Valve Open/Close Detection SensorMWSG-100
RepeaterMWSR2-900 · Optional
Signal MonitorMWSM-700
PC monitoringSensor location · detection history
Text alertsManager's mobile phone
SCADAControl room monitoringRanges are based on open field with no obstacles. Each added repeater extends the range by approx. 1 km.
05Specifications
Gas Valve Open/Close Detection Sensor
Model MWSG-100
| Size | W73 × D47 × H84 mm |
|---|---|
| Frequency | 920.700 MHz (FSK) |
| Transmission range | approx. 100 m (open field) |
| Power | Self-powered (no battery) |
| Dust · water protection | IP57 |
| Application | Gas valve |
Plastic Valve Open/Close Detection Sensor
Model MWSG-120
| Size | W99 × D70 × H50 mm |
|---|---|
| Frequency | 920.700 MHz (FSK) |
| Transmission range | approx. 100 m (open field) |
| Power | Self-powered (no battery) |
| Dust · water protection | IP57 |
| Application | Fluid valve (PVC) |
Knife Valve Open/Close Detection Sensor
Model TBD
| Size | W110 × D78 × H182 mm |
|---|---|
| Frequency | 920.700 MHz (FSK) |
| Transmission range | approx. 100 m (open field) |
| Power | Self-powered (no battery) |
| Dust · water protection | IP57 |
| Application | Fluid valve |
Ball Valve Open/Close Detection Sensor
Model TBD
| Size | W106 × D60 × H102 mm |
|---|---|
| Frequency | 920.700 MHz (FSK) |
| Transmission range | approx. 100 m (open field) |
| Power | Self-powered (no battery) |
| Dust · water protection | IP57 |
| Application | Fluid valve |
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
Monitoring valve opening and closing at GIS facilities, where operator errors cause losses
Remote monitoring of gas valves, where mis-operation can lead to serious accidents
Integrated valve monitoring across large complexes with added relays
Preventing discharge of wastewater from workplaces, which is subject to criminal penalties
Installation sites
Field installation photos13
Applicable platforms
07Certifications · patents
KC Conformity Registration — Gas Valve Open/Close Detection SensorR-R-M1p-MWSG-100 · 2022-09-28
FCC — Valve Detection SensorFCC ID 2BTDM-MWSDG-100 · 2026
IECEx international explosion-proof certification (intrinsic safety)IECEx ICR 24.0005X · 2024-09-10
Self-powered gas valve wireless remote open/close monitoring systemRegistered (Korea)
Self-powered gas valve wireless remote open/close monitoring system (PCT)PCT international application
Self-powered gas valve open/close dual-monitoring system (PCT)PCT international application
09FAQ
QDo we need to replace our existing valves?
No. It is an add-on that attaches the sensor module to the valves you already use. If the valve specifications differ, we adapt the module through consultation.
QCan it send data to SCADA?
Data is passed to the control room SCADA via the Signal Monitor's RS-485 communication and relay contacts, and at GIS substations it has been integrated with an IEC 61850 dedicated monitoring panel.
QCan it be used in hazardous (explosion-proof) areas?
The sensor is designed as the EXIMWS Series, certified for IECEx intrinsically safe explosion protection (Ex ib IIB T4 Gb). We will confirm the applicable models and ratings together with your site conditions.
CONTACT MPIA
Self-powered Valve Open/Close Detection Sensor
A power-free sensor added to existing valves that reports open/closed status wirelessly