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  1. Detection - Measurement
  2. Temperature and Humidity Measurements
  3. Relative humidity and temperature sensor
  4. Milesight IoT
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Relative humidity and temperature sensor EM320-TH
wall-mountLoRaWANDC

Relative humidity and temperature sensor - EM320-TH - Milesight IoT - wall-mount / LoRaWAN / DC
Relative humidity and temperature sensor - EM320-TH - Milesight IoT - wall-mount / LoRaWAN / DC
Relative humidity and temperature sensor - EM320-TH - Milesight IoT - wall-mount / LoRaWAN / DC - image - 2
Relative humidity and temperature sensor - EM320-TH - Milesight IoT - wall-mount / LoRaWAN / DC - image - 3
Relative humidity and temperature sensor - EM320-TH - Milesight IoT - wall-mount / LoRaWAN / DC - image - 4
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Characteristics

Type
relative
Mounting
wall-mount
Output
LoRaWAN
Supply voltage
DC
Electrical connection
built-in transmitter
Protection level
IP67
Other characteristics
high-precision, with data logger
Applications
for the food industry
Measuring range (%)

Min.: 0 %

Max.: 100 %

Precision

2 %

Resolution

0.5 %

Measuring range (temperature)

Min.: -30 °C
(-22 °F)

Max.: 60 °C
(140 °F)

Accuracy (temperature)

Min.: 0.2 °C
(32.36 °F)

Max.: 0.3 °C
(32.54 °F)

Resolution (temperature)

0.1 °C
(32.18 °F)

Working temperature

Min.: -30 °C
(-22 °F)

Max.: 60 °C
(140 °F)

Description

Product overview
  • The Milesight EM320-TH is a LoRaWAN®-based temperature and humidity sensor suitable for indoor and outdoor monitoring, with special applicability to cold chain scenarios.


Key features
  • Food-safe enclosure: FDA-approved food contact materials for safe use in environments where the sensor may contact food or food packaging.
  • IP67 rated housing: Robust enclosure enabling operation in demanding and wet environments.
  • Data storage & retransmission: Onboard storage of historical records (up to 3,000 entries) with automatic retransmission to gateway after connection recovery to prevent data loss.
  • Magnetic and standard versions: Magnetic adsorption model for easy attachment to freezers/refrigerators and standard version for wall/pole mounting.
  • High-precision sensing: Uses Sensirion SHT41 sensor for optimized accuracy and resolution.
  • Ultra-low power consumption: Battery optimized firmware for multi-year battery life even at low temperatures.
  • NFC configuration: Wireless on-site configuration and power on/off via NFC-enabled mobile app.
  • LoRaWAN® connectivity: Long-range, low-power wireless transmission compatible with standard LoRaWAN® gateways and network servers.


Detailed technical highlights
  • Sensing element: Sensirion SHT41 high-precision temperature & humidity sensor.
  • Temperature: Range -30°C to +60°C; Resolution 0.1°C; Typical accuracy ±0.2°C (0°C~60°C), ±0.3°C (-30°C~0°C).
  • Humidity: Range 0% to 100% RH; Resolution 0.5% RH; Typical accuracy ±2% RH (25°C).
  • Data handling: Threshold alarm, data storage (3,000 entries) with timestamps, data retransmission and retrievability to ensure data integrity when connectivity is intermittent.
  • Power & battery: 2 × 2700 mAh ER14505 Li-SOCl2 batteries; battery-life examples: over 10 years (SF7, typical), around 7 years (SF10 EU868) and ~6.3 years (SF10 US915) for representative configurations.
  • Physical & mounting: Food-grade PC + ABS housing (white); ingress protection IP67; dimensions 85 × 58 × 18 mm; weight ~93.2 g (standard) / 102 g (magnet).


Applications
  • Cold chain monitoring (food, beverage, pharmaceuticals)
  • Refrigerator/freezer monitoring (magnetic version attaches easily)
  • Pharmaceutical & vaccine storage monitoring
  • Greenhouse / agriculture environmental monitoring
  • Smart buildings: indoor environment monitoring, HVAC optimization
  • Industrial and server-room monitoring where precise temperature & humidity data is required


Installation
  • Standard version: wall screw mounting or pole mounting.
  • Magnetic version: magnetic adsorption for easy attachment to metal surfaces (e.g., freezers, refrigerators).


Configuration & management
  • NFC-based configuration: power on/off and device configuration wirelessly using a mobile NFC tool (on-site), enabling quick commissioning without physical disassembly.
  • Cloud integration: designed for integration with cloud device-management and visualization platforms for dashboards, alerts and reports.


Caractéristiques / spécifications techniques
  • Wireless Transmission:
    Technology: LoRaWAN®
    Antenna: Internal Antenna
    Frequencies: CN470 / IN865 / RU864 / EU868 / US915 / AU915 / KR920 / AS923-1,2,3,4
    Tx Power: 16 dBm (868 MHz) / 20 dBm (915 MHz) / 19 dBm (470 MHz)
    Sensitivity: -137 dBm @ 300 bps
    Mode: OTAA / ABP Class A
  • Measurement - Temperature:
    Range: -30°C to +60°C
    Accuracy (typ.): ±0.3°C (-30°C ~ 0°C), ±0.2°C (0°C ~ 60°C)
    Resolution: 0.1°C
  • Measurement - Humidity:
    Range: 0% to 100% RH
    Accuracy (typ.): ±2% RH (25°C)
    Resolution: 0.5% RH
  • Others:
    LED: 1 × internal LED indicator
    Button: 1 × internal Power/Reset button
  • Software & Features:
    Power on/off: Mobile app via NFC or internal power button
    Configuration: NFC mobile app configuration
    Advanced functions: Threshold alarm, data storage (3,000 entries), data retransmission, data retrievability
  • Physical Characteristics:
    Power supply: 2 × 2700 mAh ER14505 Li-SOCl2 batteries
    Battery life*: Over 10 years (SF7, EU868 & US915) — examples: ~7 years (SF10, EU868) / ~6.3 years (SF10, US915) at 10-min intervals @ 25°C
    Operating temperature: -30°C to +60°C
    Relative humidity: ≤95%
    Housing & color: PC + ABS (Food-Grade), White
    Weight: 93.2 g (Standard), 102 g (Magnet version)
    Ingress protection: IP67
    Dimension: 85 × 58 × 18 mm (3.34 × 2.28 × 0.70 in)
    Installation: Standard: wall screw / pole mounting; Magnet version: magnetic adsorption
  • Approvals:
    Regulatory: CE, FCC, TELEC, EN12830
    Environmental: RoHS
  • Notes:
    *Battery life estimates tested under laboratory conditions for guideline purposes; actual lifetime depends on configuration, environment and reporting interval.

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*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.
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