The Millivolt Sensor Node brings a wide variety of resistive bridge sensors into our system. It uses the integrated radio transceiver to report its measurements through Senceive’s wireless communications network to a Gateway.
Examples of the sensors supported:
- Pressure sensors (differential, absolute)
- Foil strain gauges
- Torque sensors
- Load cells
- Load pins
- Moisture sensing
- Conductivity
Key benefits
- Waterproof, robust connectors for simple installation
- Regulated sensor stimulus
- 24-bit sensing performance
- Integrated long life battery
- 12-15 year battery life, including when acting as a relay node within the mesh communications network
- Versatile mounting options
- Waterproof to IP66 / IP67 / IP68
- Firmware is remotely upgradeable over the air via the gateway reducing costly site visits
Physical specifications
| Parameter | Value |
|---|---|
| Dimensions excluding antenna and vent | 90 x 90 x 60 mm |
| Dimensions excluding antenna | 90 x 96 x 60 mm |
| Total Mass | 0.57kg |
| Housing Material | Die cast aluminium |
| Protection (BS EN 60529: 1992 + A2: 2013) |
IP66 / IP67 IP68 at 1m for 24 hours |
| Mounting Options | Clearance holes for M4 socket head screw in bottom M4 blind holes in side |
| Operating Temperature Range | -40°C to +85°C |
FlatMesh Radio Specifications
| Parameter | Value |
|---|---|
| * Consult with Senceive for your application | |
| Communication Type | Proprietary FlatMesh v3 Mesh Networking Protocols IEEE 802.15.4 compliant |
| Frequency Band | 2400 – 2485 MHz ISM Band |
| Maximum Transmit Power (EN 300 328 v1.8.1) |
6.5dBm |
| Maximum Permitted Antenna Gain | 2.2dBi |
| Range | Up to 300m depending on the environment and fitted antenna * |
| RF Module | Senceive FM3Node |
GeoWAN Radio Specifications
| Parameter | Value |
|---|---|
| * Consult with Senceive for your application | |
| Communication Type | Star Topology |
| Frequency Band | 863MHz – 928MHz ISM Band |
| Maximum Transmit Power | 20dBm (actual transmit power depends on geography) |
| Range | Up to 15km depending on the environment and antenna* |
| Maximum Reporting Frequency | 30 Seconds |
| Sample Storage | Stores the latest 36 days of samples at a reporting interval of 30 minutes |
Millivolt Sensor Interface
| Parameter | Value |
|---|---|
| Connector | M12 Female 5-pole A-coded Screw-in Type |
| Range | ±0.625V (±125mV/V) |
| Resolution | 74.5nV (14.9nV/V) |
| Repeatability | ±2.5μV (±0.5μV/V) |
| Stimulus | 5.0 ± 0.1V 150mA max |
Internal battery
| Parameter | Value |
|---|---|
| * Consult with Senceive for your application | |
| Battery Type | Lithium Thionyl Chloride |
| Nominal Voltage | 3.6V |
| Nominal Capacity | 19000mAh |
| Typical Battery Life | 12-15 years at 20/30 minute reporting intervals, including when acting as a relay node Assumes a resistive bridge load of 350Ω * |
Certifications
- Tested to conformity with all the essential requirements of RED Directive 2014/53/EU and RoHS Directive 2011/65/EU
- FCC Grant of Equipment Authorization: FCC ID 2AMFBFM3N
Ordering Information and Accessories
| Model | Description |
|---|---|
| FM3N-MV5 LR3N-MV5 |
FlatMesh 3 5V mV/V Sensor Node GeoWAN 5V mV/V Sensor Node |
| FS-MV5CON | Sensor Connector With screw terminals for easy installation |
| FF-MP-S360 | Swivel mounting kit with 360-degree adjustment range |
| FF-MP-V | Vertical mounting plate Use with FF-MP-S360 |
| FF-MP-H | Horizontal mounting plate |
| FF-MP-HM | Horizontal magnetic mounting plate |
| FF-MP-RA | Right angle mounting bracket Use with FF-MP-S360 |
| FF-MP-T2 | Track bed mounting plate kit |
| FF-MP-M2 | Magnetic mounting kit High degree of adjustability, perfect for cast iron lined tunnels |
| FA-FM-WPS | Waterproof straight antenna Overall node height 168mm (approx.) when fitted Maximum gain +1.1dBi |
| FA-FM-LPS | Waterproof low profile straight antenna Minimum overall node height, perfect for track bed and tight spots Overall node height 92mm (approx.) when fitted Maximum gain 0dBi |
| FA-FM-ADJ | Adjustable angle antenna Flexible installation, perfect for use in tunnels and indoor environments Overall node height 202mm (approx.) when upright Overall node height 102mm (approx.) when at 90-degree angle Maximum gain +2dBi |
| FC-NC | Antenna cover kit Use with FA-FM-LPS antenna Overall node height 96mm (approx.) when fitted |
