RHT Duct Humidity Transmitters With Temperature Output For Duct

Product Details:

Diameter 18 mm (probe diameter)
Resolution 0.1% RH, 0.1C
Equipment Type Duct Humidity & Temperature Transmitter
Humidity % 0 to 100%
Sensor Type Capacitive polymer sensor
Protection IP65
Application Media Air, HVAC Ducts
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RHT Duct Humidity Transmitters With Temperature Output For Duct Product Specifications

Humidity % 0 to 100%
Resolution 0.1% RH, 0.1C
Diameter 18 mm (probe diameter)
Power Supply AC/DC 24 V
Equipment Type Duct Humidity & Temperature Transmitter
Material ABS plastic and stainless steel (probe)
Accuracy 2% RH, 0.3C
Power Consumption <2 VA
Protection IP65
Application Media Air, HVAC Ducts
Sensor Type Capacitive polymer sensor
Range 0 to 100% RH
Measurement Range Humidity: 0~100% RH, Temp: -20~+80C
Connectivity Type 2/3 wire, analog output
Temperature Range -20C to +80C
Current Range 4-20 mA or 0-10 V selectable
Display Type LCD

Product Description

RHT Duct is a relative humidity transmitter with temperature output installed in air ventilation duct. Illuminated display ensures easy readability also from a distance. The RHT has a screwless lid and an easily adjustable mounting flange that make the installation of the device easy.

RHT Duct series devices include:

Separate output for each measurement parameter (rH and T)
Mounting flange

RHT Duct series device options offer:

Clear backlit display
Modbus RTU interface

General Specification

Accuracy:	Temperature: <0.5 C Relative humidity: 23 % rH at 050 C and 1090 % rH Total error band includes accuracy, hysteresis and temperature effect over 550 C and 1090 % rH
Measuring units:	C, % rH
Measurement elements:	NTC10k temperature sensor, thermoset polymer capacitive sensing element for humidity
Supply voltage:	24 VDC/VAC 10 %
Output signal 1:	0/25/10 V (relative humidity (default), temperature, dew point, mixing ratio, enthalpy, absolute humidity)
Output signal 2:	0/25/10 V (temperature (default), relative humidity, dew point, mixing ratio, enthalpy, absolute humidity)
Optional output signal 3:	420 mA (relative humidity (default), temperature, dew point, mixing ratio, enthalpy, absolute humidity) (A model)
Optional output signal 4:	420 mA (temperature (default), relative humidity, dew point, mixing ratio, enthalpy, absolute humidity) (A model)
Operating temperature:	0+50 C
Protection standard:	IP54

Flexible Output and Easy Integration

With selectable 4-20 mA or 0-10 V analog output and 2/3 wire connectivity, the RHT transmitter adapts effortlessly to various HVAC control systems. Its screw terminal connections and compact duct-mount design make installation fast and straightforward, ensuring real-time sensor data integration for optimal climate control.

High Precision and Reliability

Providing 2% RH and 0.3C accuracy, this transmitter leverages a capacitive polymer sensor and factory calibration for dependable results. The swift response time (<15 seconds for 63% step change) ensures timely readings crucial for energy-efficient air management in commercial or industrial environments.

User-Friendly Monitoring and Maintenance

The clear LCD display offers instant readability of humidity and temperature. Adjustment is hassle-free, with user calibration options and robust ABS plastic case protecting interior electronics, making routine maintenance simple and prolonging service life in demanding duct applications.

FAQ's of RHT Duct Humidity Transmitters With Temperature Output For Duct:

Q: How is the RHT Duct Humidity Transmitter installed in an HVAC system duct?

A: The unit is designed for duct mounting and integrates using its dedicated probe (150 mm length, 18 mm diameter) inserted directly into the duct wall. Electrical connections are easily made via screw terminals at the case, while the M16 cable gland ensures secure wiring.

Q: What does the selectable output signal mean and how do I choose between 4-20 mA and 0-10 V?

A: The transmitter provides either a 4-20 mA or 0-10 V analog signal, selectable during setup. Choose the output compatible with your control system-most building automation systems accept both, but 4-20 mA is often preferred for longer cable runs due to reduced signal degradation.

Q: When should recalibration of the transmitter be done, and how is it performed?

A: Routine recalibration ensures continued measurement accuracy. The transmitter is factory calibrated but can be user adjusted; refer to the manual's procedure to initiate calibration using the onboard controls or calibration interface when significant deviation in readings is detected.

Q: Where is this transmitter best applied, and can it be used in media other than air?

A: RHT transmitters are specially optimized for air and HVAC duct installations. Their design and sensing technology are not suitable for liquids or harsh chemical gases but perform reliably in environments ranging from -20C to +80C with 0~100% RH.

Q: What advantages does the IP65 protection provide for duct applications?

A: IP65 protection ensures the transmitter is dust-tight and resistant to water jets, safeguarding internal components from moisture and particulates commonly encountered in HVAC ducts, thus extending operational life and reducing maintenance needs.

Q: How does the fast response time benefit HVAC systems?

A: A response time under 15 seconds for 63% of step change enables prompt detection of air condition shifts, allowing HVAC systems to react quickly to fluctuations and consequently maintain a stable and efficient climate within occupied spaces.

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