Room Type Temperature Humidity Transmitter

Precision Room Temperature & Humidity Transmitter

Ensure room temperature and humidity (T+RH) monitoring with high accuracy and fast response with the Ace Instruments Temperature Humidity Transmitter. Engineered for optimal occupant comfort, this room-mounted transmitter delivers precise and consistent indoor environmental data through the utilization of the latest in sensing technology.

Available with RS-485 Modbus communication, this device provides reliable environment control to maintain building standards and air quality. The device has a clear 128x64 graphic LCD display that displays real time readings.

Whether you are managing a smart building, a critical server room, or require continuous warehouse monitoring for Good Distribution Practice (GDP) compliance, the AI-RHT-Tx provides the reliability and integration capabilities your facility demands.

Built-in vs External Sensor

Unlike transmitters that rely on a remote probe connected by cable, this device houses its temperature and humidity sensing elements directly within the unit body. This design offers the simplest possible installation: mount, wire, configure address. There's no separate probe to run, position, or protect, making the transmitter well suited to standard room monitoring applications where a built-in sensor provides sufficiently representative readings without the added complexity of remote sensor placement.

Display Options

The transmitter is available with or without a local display, depending on project needs. The GLCD display variant shows temperature and humidity values on a backlit graphical LCD, visible to occupants and facilities staff without BMS access. This makes it easy for anyone in the room to check current conditions at a glance, useful in spaces where local visibility matters alongside centralized BMS monitoring, without requiring a laptop or building system login to check current readings.

Key Features & Capabilities

• Fast Response & High Accuracy: A response time of less than 10 seconds (60% step change) with 1.8% RH accuracy and 0.5 Degree temperature accuracy ensures vigilant oversight of critical environments with timely alerts.
  
• Clear Data Visualization: Features an integrated 128x64 graphic LCD that facilitates real-time data visualization. (Also available without display).
  
• Flexible Output Integration: Offers field configurable dual output options, including 4-20 mA and 0-10 VDC signals, dedicated respectively to temperature and humidity measurement.
  
• Digital Connectivity: RS-485 Modbus communication capability ensures seamless interoperability with contemporary Building Management Systems (BMS), Supervisory Control and Data Acquisition (SCADA) systems, and other automation infrastructures.

Specifications

Ideal Applications

• Smart Buildings & Commercial Real Estate
  
  • Occupant Comfort & Productivity: Maintain ideal indoor environmental conditions to ensure well-being of every occupant.
  • Energy Optimization: Seamlessly integrate with HVAC controls, Building Management Systems (BMS), and SCADA networks via RS-485 Modbus to prevent unnecessary over-cooling or over-heating, significantly reducing energy costs.
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• Warehouse, Logistics & Cold Chain
  
  • GDP Compliance: Meet strict continuous warehouse monitoring requirements for Good Distribution Practice (GDP) compliance in the pharmaceutical industry.
  • Perishable Goods Protection: Ensure temperature and humidity remain stable in food and beverage storage facilities to prevent spoilage, mold growth, and inventory loss.
    
    
• Server Rooms & Data Centers (IT Industry)
  
  • Hardware Protection: Protect critical IT infrastructure by ensuring temperature and humidity remain within safe operating parameters.
  • Risk Mitigation: Prevent electrostatic discharge (ESD) caused by excessively low humidity, and eliminate the risk of condensation and hardware corrosion caused by high humidity.
    
    
• Cleanrooms, Laboratories & Healthcare
  
  • Process Stability: Maintain the strict environmental baselines required for medical research, biotechnology, and pharmaceutical manufacturing.
  • Infection Control: Monitor isolation wards, operating theaters, and on-site pharmacies in hospitals to ensure compliance with healthcare ventilation standards.
    
    
• Museums, Archives & Libraries
  
  • Artifact Preservation: Prevent the degradation, warping, or mold growth on priceless artwork, historical documents, and sensitive materials by maintaining highly stable, long-term temperature and humidity levels.
    
    
• Industrial Automation & Manufacturing
  
  • Quality Control: Ensure consistent environmental conditions on the manufacturing floor, which is critical for processes involving sensitive chemicals, textiles, paper, or electronics.

BMS Integration

With RS485 Modbus communication built in, the transmitter feeds real-time temperature and humidity data directly into a Building Management System, supporting centralized monitoring, trend logging, and automated HVAC responses across multiple rooms or zones from a single, simply configured device.

Frequently Asked Questions (FAQs)

1. What is the AI-RHT-Tx Room Type Temperature Humidity Transmitter?

The AI-RHT-Tx is a wall-mounted transmitter designed to continuously measure temperature and relative humidity in indoor environments. It provides accurate real-time data to Building Management Systems (BMS), PLCs, and HVAC controllers, helping maintain occupant comfort, product quality, and energy-efficient climate control.

2. What does the AI-RHT-Tx measure?

The transmitter continuously measures:

• Temperature
• Relative Humidity (RH)

3. Why is temperature and humidity monitoring important?

Maintaining the correct temperature and humidity helps improve occupant comfort, protect sensitive products, reduce condensation, prevent mold growth, and ensure consistent environmental conditions in commercial and industrial facilities.

o4.Can I connect this transmitter to my existing BMS or SCADA system?

Yes. The transmitter offers RS485 communication capability which ensures seamless interoperability with contemporary Building Management Systems (BMS), Supervisory Control and Data Acquisition (SCADA) systems, and other automation infrastructures. It features configurable dual output options, including 4-20 mA and 0-10 VDC signals.
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5. What are the standard measuring ranges for this device?

The typical measuring range for temperature is 0.0 to 50.0 Deg. C, and the typical range for relative humidity is 0.0 to 100.0%RH. Custom ranges are available upon request.
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6. Does the unit have a local display?

The standard model features a custom 128x64 LCD Graphic Display for real-time data visualization. However, it is also optional without a display for the transmitter if preferred.
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7.Can this model be used in retrofit applications?

The Ace Instruments AI-RHT-Tx is engineered to be a seamless, highly economical drop-in replacement for major industry brands, offering superior features at a competitive price point.
The AI-RHT-Tx offers part replacement for: Greystone Energy Systems: Room Humidity & Temperature Transmitters (e.g., HA & HTD Series), Siemens Building Technologies: Wall-Mounted Room Sensors (e.g., QFA Series), Honeywell: Indoor Temperature and Humidity Sensors (e.g., SCT or TR Series), Other Major Brands: Including standard room sensors from BAPI, Veris Industries, and ACI.

8. How accurate are the readings?

The temperature accuracy is ±0.2 Deg.C for the 0.0 to 50.0 Deg.C range. For relative humidity, the accuracy is ±2%RH (between 5 and 95%RH).

9. What is the difference between the built-in and external probe temperature humidity transmitter?

The AI-RHT-Tx is available in two versions:

• Built-in Sensor Model: The temperature and humidity sensors are integrated inside the transmitter enclosure. The unit is wall-mounted and measures the environmental conditions directly at the installation location.
• External Probe Model: The sensing probe is connected to the transmitter by a cable, allowing measurements to be taken at a remote location while the transmitter remains mounted on the wall. This configuration is ideal for measuring conditions inside HVAC ducts, cold rooms, environmental chambers, or other difficult-to-access locations.

10. Where is the AI-RHT-Tx commonly installed?

Typical applications include:

• Office buildings
• Hospitals
• Pharmaceutical facilities
• Cleanrooms
• Laboratories
• Schools and universities
• Hotels
• Data centers
• Museums
• Libraries
• Warehouses
• Commercial buildings

11. What accuracy can I expect from the temperature and humidity sensors?

The AI-RHT-Tx uses high-quality factory-calibrated sensors.

Typical performance is:

• Relative Humidity Accuracy: ±3% RH (within the 10 - 90% RH range)
• Temperature Accuracy: ±0.3°C

Both sensors are factory calibrated against traceable standards to provide reliable long-term measurements.

12. Can the AI-RHT-Tx be integrated with a Building Management System (BMS)?

Yes. The transmitter supports industry-standard communication options including:

• RS485 Modbus communication
• 4 to 20 mA output
• 0 to 10 V output (depending on model)

This enables seamless integration with Building Management Systems, PLCs, SCADA systems, and HVAC automation controllers.

13. Can the transmitter help improve HVAC energy efficiency?

Yes. By continuously monitoring temperature and humidity, the Building Management System can optimize heating, cooling, humidification, and dehumidification only when required, helping reduce energy consumption while maintaining comfortable indoor conditions.

14. Is the AI-RHT-Tx suitable for continuous monitoring?

Yes. The AI-RHT-Tx is designed for reliable 24×7 continuous operation in commercial, healthcare, pharmaceutical, industrial, and institutional applications.

15. Does the transmitter require calibration?

The AI-RHT-Tx is factory calibrated before shipment. Periodic verification is recommended for applications requiring high measurement accuracy, particularly in pharmaceutical manufacturing, laboratories, and regulated environments.

16. Can the transmitter be used in pharmaceutical and healthcare facilities?

Yes. The AI-RHT-Tx is suitable for pharmaceutical manufacturing, hospitals, laboratories, cleanrooms, and other controlled environments where continuous monitoring of temperature and humidity is essential for maintaining product quality and regulatory compliance.

17. Is installation easy?

Yes. The compact wall-mounted design allows quick installation and simple integration into existing HVAC systems, Building Management Systems, and automation networks.

18. What are the advantages of using the AI-RHT-Tx?

Key benefits include:

• Continuous temperature and humidity monitoring
• High measurement accuracy
• Built-in and external probe options
• Easy BMS and PLC integration
• Multiple communication outputs
• Reliable industrial-grade performance
• Low maintenance
• Suitable for commercial and industrial applications

19. Who typically uses the AI-RHT-Tx?

The AI-RHT-Tx is widely used by:

• Facility managers
• HVAC contractors
• Building automation integrators
• Pharmaceutical manufacturers
• Hospital engineering departments
• Laboratory managers
• Data center operators
• Museums and archives
• Industrial maintenance engineers

20. Why choose ACE Instruments?

ACE Instruments has over 30 years of experience in manufacturing environmental monitoring solutions. Customers choose our products for their high measurement accuracy, industrial-grade reliability, easy BMS integration, multiple communication options, calibration support, responsive technical assistance, and proven performance across commercial, healthcare, pharmaceutical, and industrial facilities.

21. How do I choose the right Room Type Temperature Humidity Transmitter?

Choosing the right AI-RHT-Tx depends on your installation location, sensing requirements, communication protocol, output signal, and application. Our application engineers can help you select the most suitable built-in or external probe model for your HVAC, cleanroom, laboratory, or industrial monitoring application.

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