Multi-functional CO2/PM2.5 Indoor Air Quality Monitor

Brand TECPEL | Model TRH-PM22 | 🇹🇼 Taiwan

PM2.5 CO2 Temperature Humidity RS-485 Modbus RTU HVAC

TRH-PM22 supports selectable temperature, humidity, CO2 and PM2.5 measurement, with local LCD display and RS-485 / Modbus RTU output for HVAC, smart buildings and indoor air quality monitoring.

Downloads

TRH-PM22 BG5 Chinese Specification Sheet 2026-08-036

Out of Stock

TRH-PM22 is a wall-mounted monitor designed for indoor air quality monitoring and HVAC system integration. It can be configured for temperature, humidity, CO2 and PM2.5 measurement as required. The LCD provides local readings, while RS-485 / Modbus RTU output allows connection to planning software or central monitoring systems for remote monitoring, data logging and ventilation control. With strong long-term stability, simple installation and convenient maintenance, it is suitable for commercial offices, homes, libraries, retail spaces, data monitoring rooms, storage areas and other indoor public environments.

Sensor TypesTemperature MEMS; Humidity MEMS; CO2 NDIR non-dispersive infrared sensor; PM2.5 infrared sensor LED
Temperature Range0 ... 50°C
Humidity0 ... 100%RH (non-condensing)
CO2 Range0 ... 2000 PPM
PM2.5 Range0 ... 500 μg/m³
Temperature Accuracy±0.3°C (at 25°C, 101.3 kPa, DC 24 V)
Humidity Accuracy±2.5%RH (at 30 ... 80%RH)
CO2 Accuracy±40 PPM ±3% of reading
PM2.5 Accuracy±10 μg/m³ ±5% of reading
Temperature Effect±0.15%RH/°C
Temperature/Humidity Response Timet63 (15 ... 45°C / 33 ... 75%RH) <= 10 sec
CO2 Response Timet90 < 2 min.
PM2.5 Response Time3 sec

Multi-parameter MeasurementSelectable temperature, humidity, CO2 and PM2.5 measurement for different site requirements.
RS-485 ConnectionRS-485 digital output for integration with monitoring hosts or control systems.
Modbus RTUModbus RTU communication interface, address 1 ... 247.
Selectable Baud RateSupports 9600, 19200, 38400, 57600 and 115200.
Local LCD DisplayOn-site readings support inspection and maintenance work.
Remote Monitoring and LoggingWorks with planning software via RS-485 output for remote monitoring and field data logging.
Long-term StabilityStable for continuous environmental monitoring applications.
Easy MaintenanceWall-mounted installation with simple maintenance access.

Measured MediumAir
Operating Temperature0 ... 50°C
Operating Environment Humidity0 ... 85%RH
Storage Temperature-20 ... +60°C
Power SupplyDC 24 V±10% & AC 24 V±10%
Power ConsumptionDC: 150 mA / AC: 120 mA
Startup CurrentDC 24 V: 250 mA / AC: 230 mA
Electrical ConnectionTerminal block
MountingWall-mounted
Protection RatingIP20
Electrical ProtectionReverse protection, short-circuit protection
CertificationCE
Body MaterialPC flame-retardant grade (PC-110) (UL94V-2)
Weight115 g (display)
ApplicationsIndoor air quality monitoring, smart commercial offices, homes, HVAC, air-conditioning systems, libraries, green industry, retail stores, department stores, data monitoring rooms, storage rooms, indoor ventilation adjustment and HVAC monitoring in public indoor areas