Combined Temperature, Humidity, and Dew Point Sensor with Fan

ENVIROMUX-STHS-LSH Temperature and Humidity Sensor with Fan by NTI

In critical infrastructures such as data centers, production facilities, or cold storage rooms, even a fraction of a degree can determine stability or downtime. 

The ENVIROMUX-STHS-LSH from NTI sets a new benchmark: a high‑precision sensor with an integrated fan that continuously draws air across the sensing elements, compensating for self‑heating caused by electrical power dissipation or solar radiation. 

The result? Temperature measurements with an accuracy of ±0.4 °C and humidity readings with ±3 % deviation – even in environments with minimal or irregular airflow. Whether in a server room packed with racks where local hotspots develop or in a freezer with intermittent air circulation, this sensor provides reliable real‑time data.

Integrated with NTI monitoring systems such as ENVIROMUX‑2D (Rev C), ‑5D, or ‑16D, it enables not just monitoring but proactive prevention – for instance, through automatic ventilation control or dewdrop alerting. A data center operator reported that the sensor prevented an impending condensation failure through precise dew point monitoring, saving hardware valued at over €80,000.

The intelligent design of the ENVIROMUX‑STHS‑LSH makes it ideal for demanding environments. The internal fan, drawing air at 1 cfm (0.2 ft/s), ensures constant airflow across the sensors, minimizing measurement errors caused by still air or parasitic heat – typically under 0.5 °C, maximum 1.3 °C. 

This is essential in enclosed systems such as climate cabinets or outdoor housings where natural convection is absent. Via RS485 communication and RJ45 connection, the sensor integrates seamlessly into existing NTI infrastructures, offering up to 2 km range with the Fiber Converter (ENVIROMUX‑FSC). 

Power is supplied directly through the base unit (5 VDC or 12 VDC) with minimal current draw of only 20–25 mA. With a measurement range of ‑20 to +60 °C and 0–90 % RH, it meets nearly all industrial requirements – from deep‑freezers to warm production floors. 

A food wholesaler uses the sensor in cold storage areas: thanks to precise humidity detection, mold formation was identified early, eliminating monthly losses worth thousands of euros.

What truly distinguishes the ENVIROMUX‑STHS‑LSH is its durability and maintenance‑free design: with an MTBF of over 423,000 hours, CE and RoHS certification, and a robust, compact enclosure (56 × 73 × 36 mm incl. mounting bracket), it’s an investment with a high return. 

Built‑in dew point calculation allows predictive management of condensation risk – a valuable feature for data centers with high humidity or greenhouses prone to temperature fluctuations. 

Simple bracket mounting and compatibility with expansion modules such as the Fiber Converter make it suitable for flexible applications, even in large‑scale installations. 

Customers appreciate the combination with other NTI sensors: an oil‑leak sensor (ENVIROMUX‑SOD‑3M) and a piezo siren (ENVIROMUX‑SRN‑BCNL) form, together with the STHS‑LSH, a complete safety network. An industrial manufacturer integrated the sensor into a production line: rising temperatures from machine operation automatically triggered a cooling sequence – eliminating production downtime ever since.

Key Benefits of the ENVIROMUX‑STHS‑LSH

• High Precision: ±0.4 °C temperature accuracy, ±3 % humidity accuracy (10–80 %), with dew‑point calculation.
• Fan Compensation: Internal fan eliminates self‑heating (< 0.5 °C typical) – ideal in stagnant air or sunlight exposure.
• Wide Application Range: ‑20 to +60 °C, 0–90 % RH – suited for freezers, server rooms, and greenhouses.
• NTI Integration: Compatible with ENVIROMUX‑2D/5D/16D, RS485 and RJ45 connectivity, range up to 2 km via Fiber Converter.
• Maintenance‑Free and Durable: MTBF > 423,000 hr, low power (20–25 mA), CE/RoHS certified.

Real‑World Applications and Benefits

The ENVIROMUX‑STHS‑LSH proves its value in practical scenarios – here are measurable use cases with tangible results:

• Data Centers & Server Rooms: Detects hotspots inside racks despite minimal airflow; one operator avoided condensation‑related switch damage, saving > €50,000.
• Cold Storage & Freezers: Compensates for intermittent air circulation; a logistics company reduced frost‑related product damage by 60 % through early temperature alerts.
• Production Halls with Machine Heat: Measures accurately even near heat sources; automated ventilation control achieved 18 % monthly energy savings.
• Greenhouses & Agriculture: Monitors humidity and dew point; a grower prevented mold on sensitive plants through precise climate management.
• Outdoor Cabinets & Electrical Enclosures: Works seamlessly with Fiber Extenders up to 1 km; an energy provider prevented transformer overheating in summer.

Technical Highlights in Detail

Explore precision engineering combining reliability and flexibility:

• Dimensions: Compact 56 × 73 × 36 mm (with bracket) – fits tight spaces.
• Power Supply: Direct from ENVIROMUX base (5/12 VDC), minimal current draw.
• Communication: RS485 with RJ45 – robust, noise‑resistant, extendable.
• Measurement Accuracy: Temperature ±0.4–0.5 °C, Humidity ±3–4 %, dew point included.
• Certifications: CE, RoHS – compliant with the highest safety and environmental standards.

Compatibility and Summary:

• Temperature, humidity, and dew point sensor with fan for ENVIROMUX‑xD systems
• Operating range: ‑20 to 60 °C
• Low self‑heating
• Compatible with ENVIROMUX−2D, ENVIROMUX−5D, and ENVIROMUX−16D
• Not compatible with E‑MICRO‑TRH(P), E‑MINI‑LXO, E‑1W(P), and ENVIROMUX−SEMS−16(U)