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RHT-MOD Humidity Transmitters For Building Automation Systems That Use Modbus Serial Communication Protocol

RHT-MOD Humidity Transmitters For Building Automation Systems That Use Modbus Serial Communication Protocol

Product Details:

  • Resolution 0.1 % RH, 0.1 C
  • Sensor Type Capacitive Polymer
  • Equipment Type Humidity Transmitter
  • Temperature Range -40 C to 80 C
  • Humidity % 0-100%
  • Measurement Range 0 to 100 % RH, -40 C to 80 C
  • Connectivity Type Modbus RTU (RS485)
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RHT-MOD Humidity Transmitters For Building Automation Systems That Use Modbus Serial Communication Protocol Product Specifications

  • 0 to 100 % RH, -40 C to 80 C
  • Modbus RTU (RS485)
  • 0 to 100 % RH
  • IP65
  • Air
  • 12-30 Vdc / 24 Vac
  • ABS Enclosure
  • 0.1 % RH, 0.1 C
  • LCD (optional)
  • Capacitive Polymer
  • < 1.0 W
  • Humidity Transmitter
  • 1.5 % RH (20 to 80 % RH), 0.2 C
  • 0-100%
  • -40 C to 80 C

Product Description

RHT-MOD relative humidity transmitters are engineered for building automation systems in the HVAC/R industry. The RHT measures relative humidity (rH), and temperature (T). RHT devices are available with large touchscreen display making conguration of the device quick and easy. Configuration is also possible via Modbus network.

RHT-MOD devices include:

  • Separate eld congurable Modbus output for each measurement parameter (rH and T)
  • One analog output for selected measurement: voltage (0/210 V) and current (420 mA)
  • Optional relay output

General Specification

Communication:

RS-485 Modbus (RTU)

Accurary:

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:

Pt1000 temperature sensor, thermoset polymer capacitive sensing element for humidity

Supply voltage:

24 VDC/VAC 10 %

Current consumption:

max 90 mA (at 24 V) + 10 mA for each voltage output or 20 mA for each current output

Output signal 1:

0/210 V (linear to rH), L min 1 k or
420 mA (linear to rH), L max 500

Output signal 2:

0/210 V (linear to Temp), L min 1 k or
420 mA (linear to Temp), L max 500

Optional relay output:

Potential free SPDT 250 VAC, 6 A / 30 VDC, 6 A with adjustable switching point and hysteresis

Operating temperature:

0+50 C

Protection standard:

IP20



High Accuracy and Reliable Performance

RHT-MOD Humidity Transmitters provide exceptional measurement accuracy, guaranteeing 1.5% RH and 0.2C across a wide range. Rapid response and continuous sampling (every 1 second) ensure real-time data for building automation applications, supporting efficient climate control and energy management.


Flexible Installation and Robust Build

With an IP65-rated ABS enclosure and the ability to mount on walls or ducts, the transmitter suits various indoor environments. Long cable run capability (up to 1000 meters on RS485) enables flexible positioning within large facilities, simplifying networking in complex building infrastructures.

FAQ's of RHT-MOD Humidity Transmitters For Building Automation Systems That Use Modbus Serial Communication Protocol:


Q: How do I integrate the RHT-MOD Humidity Transmitter into a Modbus RS485 network?

A: Integrating the RHT-MOD is straightforward. Connect the RS485 terminals to your network cabling, configure the device address and communication parameters, and add it to your building automation system. It is compatible with any system supporting Modbus RTU protocol.

Q: What environments are suitable for installing the RHT-MOD transmitter?

A: Thanks to its IP65 rating and operating temperature range of -10C to 60C, the RHT-MOD is ideal for installation in diverse indoor air environments, including HVAC ducts and wall mounts in commercial, industrial, or institutional buildings.

Q: When should I use a humidity transmitter with Modbus RTU communication?

A: Employ the RHT-MOD transmitter when you require accurate remote monitoring and control of humidity and temperature within building automation systems, especially where Modbus RTU is the preferred protocol for integration.

Q: Where can the transmitter be mounted for optimal results?

A: The unit can be mounted on walls or directly inside ventilation ducts to ensure accurate measurements of ambient air humidity and temperature, adapting to the architectural needs of your facility.

Q: What process does the sensor use to measure humidity and temperature?

A: The RHT-MOD utilizes a capacitive polymer sensor for humidity and a precision element for temperature. It samples environmental conditions every second, providing quick and reliable data output.

Q: What benefits do I get from choosing the RHT-MOD for building automation?

A: This transmitter offers high accuracy, fast response, robust environmental protection, and seamless integration into Modbus RTU-based systems, supporting energy efficiency and improved indoor climate control.

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