Temperature & humidity sensor Milesight EM300TH915M

The Milesight EM300TH915M Temperature & Humidity Sensor is a compact freestanding device for indoor and outdoor climate monitoring. It uses a high-sensitive Sensirion sensor to measure temperature and relative humidity with high accuracy across a wide operating range. The sensor features IP67 protection, onboard storage for historical records, support for data retransmission, and NFC configuration for easy setup.

Advantages

The EM300TH915M provides precise readings with ±0.3°C temperature accuracy and ±3% RH humidity accuracy over an operating range of -30°C to 70°C and 0% to 100% RH. Its IP67-rated enclosure enables use in wet or dusty environments. Onboard memory stores up to 2800 historical data records that cannot be manually deleted, preserving traceability. Retransmission capability improves communication reliability by ensuring data reaches the server even during intermittent network outages. NFC-based switching and configuration simplify deployment and maintenance.

Suitable for

• Indoor climate monitoring in offices, storage rooms, and laboratories
• Outdoor environmental monitoring where IP67 protection is required
• Cold chain and refrigerated storage monitoring
• Industrial sites and agricultural environments needing humidity control

Key specifications

• Sensor model: Sensirion high-sensitive temperature & humidity sensor
• Temperature range: -30°C to 70°C
• Humidity range: 0% to 100% RH
• Temperature accuracy: ±0.3°C
• Humidity accuracy: ±3% RH
• Protection rating: IP67
• Data storage: up to 2800 historical records (non-deletable manually)
• Communication: supports data retransmission for reliability
• Configuration: NFC from mobile phone or PC
• Battery life: up to 5 years (4000 mAh) — as per product data
• Dimensions: 88 mm x 87 mm x 27 mm

How to use

Place the EM300TH915M in the monitoring location ensuring the sensor is exposed to the ambient air and the enclosure is properly sealed if installed outdoors. Power the device with the provided battery and use a smartphone or PC with NFC to switch the device on and perform configuration (reporting interval, thresholds, and network settings). Integrate the sensor with your Milesight server or compatible web server and verify data transmission. If the network is unstable, enable retransmission to ensure all measurements reach the server.

Recommendations

For accurate measurements, avoid placing the sensor near heat sources, direct sunlight, or localised moisture sources. Regularly check battery status and configure appropriate reporting intervals to balance data granularity and battery life. Use the IP67 enclosure for outdoor or harsh environments and rely on onboard storage to maintain an audit trail of historical readings.