Honeywell Dwyer RHPX-3SDA0-00 Duct Mount Humidity/Temperature Transmitter: Precision Environmental Monitoring for HVAC Systems

Posted on: 20/03/2026

Dwyer RHPX-3SDA0-00 Duct Mount Humidity & Temperature Transmitter with 3% accuracy and analog output. Imported and distributed by DLK Trading Service Co., Ltd. High performance for HVAC and BMS applications.

Honeywell Dwyer RHPX-3SDA0-00 Duct Mount Humidity/Temperature Transmitter: Precision Environmental Monitoring for HVAC Systems

In modern Building Management Systems (BMS) and commercial HVAC applications, maintaining the delicate balance between temperature and humidity is essential for occupant comfort and equipment longevity. The Dwyer RHPX-3SDA0-00 (USA) is a specialized duct-mount transmitter designed to deliver high-performance sensing with a UV-rated, IP66-protected enclosure, making it a top choice for demanding mechanical environments.

This product is imported and officially distributed in Vietnam by DLK Trading Service Company Limited

1. Advanced Capacitance Polymer Technology

The reliability of the RHPX-3SDA0-00 lies in its sophisticated sensing mechanisms:

Humidity Sensing: It utilizes a capacitive polymer sensor that quickly absorbs or releases water vapor. This technology ensures an accuracy of ±3% RH, even in environments with rapidly fluctuating conditions.
Temperature Sensing: The integrated Solid State Band Gap sensor provides a fast response time and high linearity, allowing your DDC or PLC controller to make real-time adjustments to air handling units.
Plenum-Rated Probe: The probe features a specialized hydrophobic filter that protects the sensor from water condensation and contaminants, ensuring long-term calibration stability.

2. Operational Advantages of Model RHPX-3SDA0-00

Field-Selectable Outputs: Using simple onboard DIP switches, engineers can toggle the output signal between 4-20 mA, 0-5 VDC, or 0-10 VDC. This flexibility reduces the risk of hardware incompatibility during site commissioning.
IP66 Rated Protection: The "Small Enclosure" (S-series) is compact yet rugged, offering full protection against dust and high-pressure water jets, ideal for industrial-grade ductwork.
Efficient Installation: The transmitter features a removable terminal block, allowing technicians to wire the unit easily without having to hold the entire sensor assembly in place.

3. Key Strategic Applications

Air Economizers: By accurately measuring outdoor air enthalpy, the BMS can decide when to use "free cooling," reducing the electrical load on chillers by 15–20%.
Data Centers: Continuous monitoring of supply air ducts prevents dew point condensation on sensitive server surfaces and prevents overheating.
Pharmaceutical & Electronics Cleanrooms: Maintaining specific humidity levels is critical for static control and the integrity of moisture-sensitive raw materials.
Commercial Office & Hospitality: Interfaces with AHU/PAUs to automatically balance airflow, creating a healthier and more comfortable indoor environment.

4. Technical Specifications (Datasheet Summary)

Feature	Technical Details
Manufacturer	Dwyer Instruments (USA)
Humidity Accuracy	±3% RH (within 10-90% RH range)
Measurement Range	0% – 100% RH; -40°C – 60°C
Output Signals	Field Selectable: 4-20 mA / 0-5 VDC / 0-10 VDC
Power Supply	10-35 VDC (for current) or 15-35 VDC / 15-29 VAC (for voltage)
Enclosure Rating	IP66 (UV-rated plastic)
Mounting Type	Duct Mount (Plenum-Rated Probe)
Safety Standard	UL 2043 (Suitable for plenum space installation)

5. Why Source Your Dwyer Equipment from DLK?

Selecting the correct model and ensuring genuine quality is vital for system stability. DLK Trading Service Co., Ltd provides:

100% Genuine Products: Fully backed by CO/CQ certificates directly from Dwyer USA.
Engineering Expertise: Our team assists in decoding model variants (e.g., 2%, 3%, or 5% accuracy options or units with passive thermistors like Pt100/NTC 10K).
Optimized Project Pricing: As a direct importer, we offer the most competitive rates for M&E contractors.
Technical Support: We provide hands-on guidance for installation and DIP switch configuration.