About
This air quality monitor is designed for monitoring multiple air quality parameters within an air duct. The sensor is installed in the outdoor or return air duct. It measures PM2.5, PM10, carbon dioxide (CO2), TVOC, air temperature, and relative humidity in real-time.
Intelligent control algorithms minimize the influence of ambient temperature and humidity on measured values. The device comes with numerous presets suitable for commercial building requirements, enabling quick and easy initial setup. Its pilot tube inlet and outlet design, instead of a common air pump, adapts to a wider range of air speeds and ensures a long lifetime. It supports Modbus RTU (RS-485) communication protocol for easy integration with building management systems.
Initial Setup
The device powers on when voltage is connected.
Note: Upon first use or after long-term storage, the device should be powered on continuously for at least 48 hours to ensure stable output of all measured values.
Light Indication
The indicator area is located on the bottom right side of the device. For this monitor (Part number: C7355B1052), refer to the ON and SCALE indicators.
ON Indicator: Illuminates when the power is on, indicating the device is working. If it is off, the device may be faulty.
SCALE Indicator: Displays the one-minute average value of PM2.5, changing color based on concentration:
- Green light: PM2.5 < 35 µg/m³
- Yellow light: 35–75 µg/m³
- Red light: > 75 µg/m³
Communication Settings
Wired communication via Modbus RTU (RS-485) is available. Wiring terminals are shown in Figure 2. Refer to the Mounting Instructions for detailed wiring and installation guidance.
Specifications
Part Number: C7355B1052
Detection Parameters: PM 2.5/PM 10, CO2, TVOC, Temperature and RH
Operating Environment: 4 °F–140 °F (-20 °C–60 °C); 0–99%RH (non-condensing)
Storage Conditions: 32 °F–122 °F (0 °C–50 °C); 10–60%RH
Overall Dimension: 7.09 in x 4.92 in x 2.58 in (180 mm x 125 mm x 65.5 mm)
Net weight: 1.87 lb (850 g)
Modbus Register Table
The device supports Modbus RTU communication. Key configuration and data registers are detailed below:
Certification Standard: CE/FCC
Modbus Configuration:
- Mode: RTU (MSB First)
- Baud Rate: Configurable (e.g., 4800, 9600, 14400, 19200, 38400, 56000, 57600, 115200), default 9600bps.
- Start Bits: 1
- Data Bits: 8
- Stop Bits: 1 or 2, default 1.
- Parity: None, Odd, or Even, default None.
- Support Function Codes: 3 (Read Holding Registers), 4 (Read Input Registers), 6 (Write Single Register), 16 (Write Multiple Registers).
Register Map Summary
| Starting Register (Decimal) | Data Description | Read/Write | Quantity of Registers (2Bytes/16bit) | Format | Decimals | Data Range / Description | Default |
|---|---|---|---|---|---|---|---|
| 0/1050 | PM2.5 hourly average measurement | R | 2 | Float-Big Endian | 1 | 0–1000.0 µg/m³ | |
| 2/1052 | PM10 hourly average measurement | R | 2 | Float-Big Endian | 1 | 0–1000.0 µg/m³ | |
| 8/1058 | CO2 hourly average measurement | R | 2 | Float-Big Endian | 0 | 0–5,000 ppm | |
| 10/1060 | TVOC hourly average measurement | R | 2 | Float-Big Endian | 3 | 0–4000 mg/m³ | |
| 12/1000 | PM2.5 one minute average measurement | R | 2 | Float-Big Endian | 1 | 0–1000.0 µg/m³ | |
| 14/1002 | PM10 one minute average measurement | R | 2 | Float-Big Endian | 1 | 0–1000.0 µg/m³ | |
| 16/1004 | Temperature real-time measurement | R | 2 | Float-Big Endian | 2 | -20.00 °C–60.00 °C | |
| 18/1006 | Humidity real-time measurement | R | 2 | Float-Big Endian | 2 | 0–100.00% RH | |
| 20/1008 | CO2 real-time measurement | R | 2 | Float-Big Endian | 0 | 0–5,000 ppm | |
| 22/1010 | TVOC real-time measurement | R | 2 | Float-Big Endian | 3 | 0–4000 mg/m³ | |
| 24/1100 | PM2.5 24-hour moving average measurement | R | 2 | Float-Big Endian | 1 | 0–1000.0 µg/m³ | |
| 26/1102 | PM10 24-hour moving average measurement | R | 2 | Float-Big Endian | 1 | 0–1000.0 µg/m³ | |
| 32/1108 | CO2 24-hour moving average measurement | R | 2 | Float-Big Endian | 0 | 0–5,000 ppm | |
| 34/1110 | TVOC 8-hour moving average measurement | R | 2 | Float-Big Endian | 3 | 0–4000 mg/m³ | |
| 1300 | Primary pollutant 24-hour average measuring value (One of PM2.5/PM10/CO2/TVOC) (Calculated based on 24-hour or 1-hour moving average measurement) | R | 2 | Float-Big Endian | 1300 | ||
| 1302 | Primary pollutant type (One of PM2.5/PM10/CO2/TVOC) (Calculated based on 24-hour or 1-hour moving average measurement) | R | 1 | INT16 | 1-PM25, 2-PM10, 3-CO2; 4-TVOC | ||
| 1303 | Index level of the primary pollutant (One of PM2.5/PM10/CO2/TVOC) (Calculated based on 24-hour or 1-hour moving average measurement) | R | 1 | INT16 | Level 1-Excellent, Level 3-Light pollution, Level4-Medium pollution, Level 5-Heavy pollution, Level 6-Severe pollution | ||
| 1304 | AQI value of the primary pollutant) (One of PM2.5/PM10/CO2/TVOC) (Calculated based on 24-hour or 1-hour moving average measurement) | R | 1 | INT16 | 0–500 | ||
| 1320 | PM2.5 AQI value (Calculated based on 24-hour moving average measurement) | R | 1 | INT16 | 0–500 | ||
| 1321 | PM10 AQI value (Calculated based on 24-hour moving average measurement) | R | 1 | INT16 | 0–500 | ||
| 1322 | CO2 AQI value (Calculated based on 24-hour moving average measurement) | R | 1 | INT16 | 0–500 | ||
| 1323 | TVOC AQI value (Calculated based on 24-hour moving average measurement) | R | 1 | INT16 | 0–500 | ||
| 1350 | PM2.5 Pollution index level (Calculated based on 24-hour moving average measurement) | R | 1 | INT16 | 1–6 | ||
| 1351 | PM10 Pollution index level (Calculated based on 24-hour moving average measurement) | R | 1 | INT16 | 1–6 | ||
| 1352 | CO2 Pollution index level (Calculated based on 24-hour moving average measurement) | R | 1 | INT16 | 1–6 | ||
| 1353 | TVOC Pollution index level (Calculated based on 24-hour moving average measurement) | R | 1 | INT16 | 1–6 | ||
| 78 | 3 color LED status | R | 1 | INT16 | 0-OFF, 1-Green, 2-Yellow, 3-Red | 0 | |
| 0 | Modbus Address | R/W | 1 | UINT16 | 1–247 | 1 | |
| 1 | Modbus rate (bps) | R/W | 1 | UINT16 | 1-4800, 2-9600, 3-14400, 4-19200, 5-38400, 6-56000, 7-57600, 8-115200 | 2 | |
| 2 | Modbus Parity check bit | R/W | 1 | UINT16 | 1-NONE, 1 STOP_BIT, 2-NONE, 2 STOP_BIT, 3-Odd, 1STOP_BIT, 4-Even, 1STOP_BIT | 1 | |
| 4 | Temperature correction value | R/W | 2 | Float-Big Endian | 2 | -3.0–3.0 °C / -6.0–6.0 °F | -2.0 |
| 6 | Humidity correction value | R/W | 2 | Float-Big Endian | 2 | -5.0–5.0%RH | 0 |
| 14 | CO2 compensation value | R/W | 2 | Float-Big Endian | 0 | -300.0–300.0 ppm | 0 |
| 50/1175 | PM2.5 hourly average measurement x10 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0–1000.0 µg/m³ | |
| 51/1176 | PM10 hourly average measurement x10 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0–1000.0 µg/m³ | |
| 54/1179 | CO2 hourly average measurement x1 | R | 1 | UINT16 | 0 | 0–5000 corresponding to 0–5,000 ppm | |
| 55/1180 | TVOC hourly average measurement x1000 | R | 1 | UINT16 | 3 | 0–3575 corresponding to –4.000 mg/m³ | |
| 56/1150 | PM2.5 one minute average measurement x10 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0~1000.0 µg/m³ | |
| 57/1151 | PM10 one minute average measurement x10 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0–1000.0 µg/m³ | |
| 58/1152 | Temperature real-time measurement x100 | R | 1 | INT16 | 2 | -2000–6000 corresponding to -20.00 °C–60.00 °C | |
| 59/1153 | Humidity real-time measurement x100 | R | 1 | UINT16 | 2 | 0–10000 corresponding to 0–100.00% RH | |
| 60/1154 | CO2 real-time measurement x1 | R | 1 | UINT16 | 0 | 0–5000 corresponding to 0–5,000 ppm | |
| 61/1155 | TVOC real-time measurement x1000 | R | 1 | UINT16 | 3 | 0–3575 corresponding to –4.000 mg/m³ | |
| 62/1200 | PM2.5 24-hour moving average measurement x10 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0–1000.0 µg/m³ | |
| 63/1201 | PM10 24-hour moving average measurement x10 | R | 1 | UINT16 | 1 | 0–10000 corresponding to 0–1000.0 µg/m³ | |
| 66/1204 | CO2 24-hour moving average measurement x1 | R | 1 | UINT16 | 0 | 0–5000 corresponding to 0–5,000 ppm | |
| 67/1205 | TVOC 24-hour moving average measurement x1000 | R | 1 | UINT16 | 3 | 0–3575 corresponding to 0–4.000 mg/m³ |
Note: In order to reserve the decimal part, the measuring value with decimal will be magnified 10/100/1000 times, marked as x10/x100/x1000.
Contact Information
Honeywell Building Technologies
Honeywell
715 Peachtree Street NE
Atlanta, GA 30308
customer.honeywell.com
Honeywell Building Technologies
Honeywell GmbH
Böblinger Strasse 17
71101 Schönaich, Germany
buildings.honeywell.com
©2020 Honeywell International Inc. Printed in United States.
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