QHT 24R is an intelligent combined sensor for Air Quality (VOC), Humidity (RH) and Temperature (T) with analogue outputs, Modbus and LCD display.
The Air Quality sensor itself is a Mix Gases sensor with high sensitivity for Volatile Organic Compounds (VOC) such as carbon dioxide, carbon monoxide, ammonia, body odours, breath air, cigarette smoke etc.
QHT 24R have three selectable outputs 0-10 Vdc, 4-20 mA or 0-5 Vdc for each parameter of Air Quality (VOC), Humidity (rH) and Temperature (T), the outputs are corresponding to 0 to 1000 ppm, 0 to 100% RH and 0 to 100 degrees Celcius.
The intelligent sensor QHT 24R have Modbus RS485 Network connection,
Modbus RTU at 19.2k and 9600 baud
The LCD display show actual value for:
Air Quality (VOC), Humidity (rH) and Temperature (T):
- Air Quality (VOC) LCD display reading is 0 to 1000 ppm:
0 to 99 ppm = Fine
110 ppm = Fair
400 ppm = Poor
600 ppm = Bad
- Humidity LCD display reading is 0 to 100% rH
- Temperature LCD display reading is 0 to 100 degrees Celcius
The intelligent sensor QHT 24R offers long term high stability and accuracy for all measured parameters; Air Quality (VOC), Humidity (rH) and Temperature (T)
QHT 24R can be used to ensure adequate ventilation while maximizing energy savings by ventilating at the optimum level, making these ideal for all types of ventilation in many applications.
The QHT 24RS is same as the QHT 24R but without set point buttons.
The QHT 24RS is mainly used in schools, hotels, offices etc.
Detectable VOC gases
• Cigarette smoke
• Automobile exhaust
• Breath air
• Carbon dioxide (CO)
• Carbon monoxide (CO)
• Solvent fumes
• Alcohol fumes
• Dimethyl amine
• Ethylene oxide
• Hydrogen sulfide
• Methyl chloride
• Methylene chloride
• Methyl ether
• Methyl acetate
• Methyl ethyl ketone
• n-Hexane 2
• Sulfur dioxide
• Vinyl chloride