Temperature and humidity · SEN-CED
Sematics Node+ Digital
A LoRaWAN sensor for an external digital (I²C) temperature and humidity probe, with an internal temperature sensor and an optional door input. For ambient monitoring in pharmaceutical storage, labs and healthcare.
- LoRaWAN
- Temperature
- Humidity
- Door
- Measurement range
- Probe −40 °C to +105 °C and 0 to 100% RH (non-condensing); internal −40 °C to +85 °C
- Accuracy
- Probe ±0.1 °C (typical, 20 to 50 °C) and ±1.5% RH (typical)
- Inputs
- External digital temperature and humidity probe (I²C) and an optional door contact
Key specifications
Node+ Digital at a glance
Copied from the Node+ Digital datasheet (SEN-CED). The full tables are further down.
| Measurement range | Probe −40 °C to +105 °C and 0 to 100% RH (non-condensing); internal −40 °C to +85 °C |
|---|---|
| Accuracy | Probe ±0.1 °C (typical, 20 to 50 °C) and ±1.5% RH (typical) |
| Inputs | External digital temperature and humidity probe (I²C) and an optional door contact |
| Logging interval | 5 minutes default, set on the platform |
| Battery life | Up to 4 years at 5-minute logging; 8+ years at 10 to 15 minutes |
| Connectivity | LoRaWAN Class A, 868 MHz; ~1 km in buildings, up to 20 km line of sight |
| IP rating | IP67 (submersible to 1 m for 30 minutes) |
| Dimensions | 99 × 56 × 32 mm (without bracket) |
| Certifications | CE, UKCA, RoHS 3, FCC Part 15; designed to meet EN 12830:2018, accuracy class 0.2 |
Datasheet
Full specifications
Every table from the datasheet, as published.
External digital probe (I²C)
| Parameter | Temperature | Humidity |
|---|---|---|
| Accuracy | ±0.1 °C (typical, 20 to 50 °C) | ±1.5% RH (typical) |
| Repeatability | ±0.04 °C to ±0.15 °C | ±0.08% RH to ±0.21% RH |
| Resolution | 0.01 °C | 0.01% RH |
| Hysteresis | Not applicable | ±0.8% RH |
| Measurement range | −40 °C to +105 °C | 0% to 100% RH (non-condensing) |
| Response time (τ63%) | >2 s | ~8 s |
| Long-term drift | <0.03 °C/year | <0.25% RH/year |
| Output | I²C digital | I²C digital |
| Cable | 1 m shielded, braided with PFA jacket | Shared cable with temperature |
Values based on the Sensirion SHT85 specification. Performance may vary slightly with the installation environment and calibration method.
Internal temperature sensor
| Sensor type | Digital (AMS AS6221) |
|---|---|
| Measurement range | −40 °C to +85 °C |
| Accuracy | ±0.1 °C; ±0.09 °C from 20 to 42 °C (typical) |
| Resolution | 0.008 °C |
| Calibration | Factory calibrated (NIST-traceable) |
Temperature accuracy by range
| 20 °C to 42 °C | ±0.09 °C |
|---|---|
| −25 °C to +55 °C | ±0.10 °C |
| −40 °C to +70 °C | ±0.12 °C |
| 70 °C to 85 °C | ±0.15 °C |
Accuracy based on sensor specification. Performance depends on temperature range and calibration method. See the certificate for uncertainty values.
Dry contact (door) input
| Input type | Volt-free dry contact (normally closed) |
|---|---|
| Detection method | Interrupt-driven digital input (event triggered on state change) |
| Event logging | State changes are timestamped with duration tracking (for example "door open for 2 min") |
| Use cases | Magnetic switches, access control relays, door sensors |
Wireless
| Protocol | LoRaWAN Class A |
|---|---|
| Frequency band | 868 MHz (EU) |
| Typical range | ~1 km (in built environments) |
| Maximum range | Up to 20 km (line of sight, elevated antenna conditions) |
| Antenna | Integrated PCB antenna (Velox SR42I052), −0.4 dBi typical, omnidirectional (approximate) |
| Module certification | Pre-certified LoRa radio module (RED and FCC Part 15 compliant) |
| Network compatibility | Private LoRaWAN networks; Sematics platform |
Power and battery
| Battery type | 2 × AA lithium cells (replaceable) |
|---|---|
| Battery capacity | ~1500 mAh (typical) |
| Nominal voltage | 1.8 V per cell (3.6 V combined nominal) |
| Battery life | Up to 4 years at 5-minute logging (typical); up to 8+ years with 10 to 15 minute logging intervals |
| Battery replacement | Field-replaceable via sealed compartment (tool access required) |
Mechanical and environmental
| Enclosure material | ABS, white |
|---|---|
| Ingress protection | IP67 (dust-tight and submersible to 1 m for 30 minutes) |
| Dimensions | 99 × 56 × 32 mm (H × W × D), without mounting bracket |
| Mounting | Adhesive pad, cable ties or screw mount; ABS bracket with slotted holes included |
| Operating temperature | −40 °C to +85 °C |
| Operating humidity | 0 to 95% RH (non-condensing) |
Logging and software
| Logging interval | Set on the platform (default 5 minutes) |
|---|---|
| Backup memory | Stores up to 100 days of data if the network goes down |
| Backfill | Missed readings are resent automatically after reconnection |
| Firmware | Over-the-air updates |
| Gateway capacity | Up to 2,000 sensors per gateway |
Compliance
| CE marking | Radio Equipment Directive (RED 2014/53/EU) |
|---|---|
| UKCA marking | UK Radio Equipment Regulations |
| RoHS 3 | Restriction of Hazardous Substances (2011/65/EU) |
| EN 12830:2018 | Designed to meet Accuracy Class 0.2, temperature data loggers |
| ETSI EN 300 220 | Radio performance (868 MHz) |
| ETSI EN 301 489-1 / EN 301 489-3 | EMC for radio equipment |
| EN 62368-1 | Electrical safety for communication equipment |
| FCC Part 15 Subpart C | US radio compliance (pre-certified module) |
| WEEE | Waste Electrical and Electronic Equipment |
| NIST traceability | Factory calibration traceable to NIST standards |
Compatible
Compatible gateways
Any Link+ gateway carries Node+ readings to Sematics. Which one depends on the building, not the sensor.
Works with
Probes and accessories
Works with Sematics
Readings become alarms, records and reports
Every reading goes to Sematics, where alarms reach a person, the audit trail is kept, and reports are ready when the inspector asks.
Next step
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