Dwyer Instruments RHP-3N4B Wall Mount RH/Temperature Transmitter with 3% Accuracy

The Dwyer RHP-3N4B is a wall mount humidity and temperature transmitter from the versatile Series RHP-E/N, designed for precise environmental monitoring in HVAC, building automation, and industrial applications. The unit measures humidity and dew point using a capacitive polymer sensor that completely recovers from 100% saturation, ensuring long-term reliability even in challenging conditions.

Key Features:

• ±3% accuracy for relative humidity measurement in the 20 to 80% RH range at 25°C
• 10K Type II thermistor temperature sensor with ±0.36°F accuracy at 77°F (±0.2°C at 25°C)
• Universal current/voltage output options including 4-20 mA loop powered, 0-5V, 0-10V, 2-10V, or 1-5V outputs
• Switch-selectable RH or dew point output with normal or reverse output configuration
• Stylish, well-vented housing design provides airflow across the sensor to improve measurement accuracy
• Fast 15-second response time with removable screw terminal block connections

Technical Specifications:

• Humidity range: 0 to 100% RH
• Operating temperature: -40 to 140°F (-40 to 60°C)
• Field-selectable temperature ranges: -20 to 140°F, 0 to 100°F, 40 to 90°F, or -4 to 140°F
• Power requirements: 10-35 VDC for loop powered models; 15-35 VDC or 15-29 VAC for voltage output models
• Low drift: less than 1% RH per year

This North American wall mount configuration is ideal for room monitoring, air economizer control, pool room environments, and general HVAC environmental control applications where accurate humidity and temperature measurement is critical for system performance and energy efficiency.