RHP-3S22 – Temperature & Humidity Sensor for Smart Building

RHP-3S22 – Integrated Temperature & Humidity Transmitter for Smart Buildings

Posted on: 21/08/2025

In Building Management Systems (BMS) and HVAC applications, accurately monitoring temperature and humidity is crucial for maintaining comfort, energy efficiency, and occupant health.

The RHP-3S22 by Dwyer Instruments (USA) is a dual-function transmitter that integrates both temperature and humidity measurement in a single unit, compliant with international standards and easily integrated into smart building systems.

1. Design & Operating Principle

RHP-3S22 is wall-mounted with a clean, flame-retardant ABS enclosure suitable for residential and industrial environments. It uses a high-precision digital sensing element and transmits data via Modbus RTU or BACnet MS/TP for seamless integration with most building automation systems.

Design Highlights:

Wall-mounted for convenient maintenance and replacement
Digital sensing element with high stability and low interference
Flexible output signals: 4–20 mA, Modbus, BACnet
Dustproof, flame-resistant enclosure for durability

2. Key Technical Specifications

Despite its compact size, RHP-3S22 offers a robust specification suitable for demanding applications:

Temperature Range: -40 to 60°C, ±0.1°C accuracy
Humidity Range: 0–100% RH, ±2% RH accuracy
Power Supply: 16–35 VDC or 19–28 VAC
Material: Flame-retardant ABS
Installation: Wall mount

These specifications ensure long-term reliability even in fast-changing or tightly controlled environments.

3. Key Advantages of RHP-3S22

RHP-3S22 is more than a transmitter—it’s a complete environmental monitoring solution:

Dual measurement in a single device → reduces cost and simplifies installation
Easy integration with BMS/HVAC via Modbus or BACnet
High accuracy enabled by advanced digital technology
Dust- and flame-resistant design for longevity
Supports energy-saving control via accurate environmental dat

4. Typical Applications

Thanks to its reliability and flexible integration, RHP-3S22 is widely used in:

Office buildings & high-rise residences – ensures a comfortable environment
Hospitals, cleanrooms, laboratories – meets strict air quality and control requirements
Hotels and resorts – enhances guest experience
Factories and warehouses – preserves product and equipment condition