Honeywell HPM Series Particulate Matter Sensors

Communication Protocol and Data Format

1. Standard version communication protocol

The standard version sensor supports the following UART commands:

Read particulate matter measurement results: obtain PM2.5 and PM10 concentrations

Start/Stop Particle Measurement: Control Sensor Working Status

Set/Read Customer Adjustment Factor: Supports user calibration

Enable/Stop Automatic Sending: Control the Active Data Reporting Mode

The data frame length is 32 bytes, including the frame header, data fields, and checksum to ensure communication reliability.

2. Compact Communication Protocol

The compact version extends PM1.0 and PM4.0 outputs on the basis of the standard version. In the measurement result response frame, the data fields are as follows:

Data0: PM1.0 concentration (high byte)

Data1: PM1.0 concentration (low byte)

Data2: PM2.5 concentration (high byte)

Data3: PM2.5 concentration (low byte)

Data4: PM4.0 concentration (high byte)

Data5: PM4.0 concentration (low byte)

Data6: PM10 concentration (high byte)

Data7: PM10 concentration (low byte)

The remaining data bytes are reserved for future expansion.

3. Automatic sending mode

The sensor supports automatic transmission mode, which can actively report measurement data according to the set frequency after activation, without the need for host polling, simplifying system software design.

Precautions for Mechanical Installation and Design

1. Installation direction

To ensure measurement accuracy and long-term stability, sensors must be installed in the specified direction. Both the standard and compact versions provide detailed installation direction diagrams, requiring:

The inlet and outlet are not obstructed

Smooth airflow path without additional resistance

Prevent particulate matter from settling or accumulating at the inlet and outlet

2. Installation dimensions

Standard version: 43 mm × 36.00 mm × 23.7 mm

Compact version: 44 mm × 36 mm × 12 mm

The compact version has a thickness of only 12 mm and is suitable for equipment designs with limited space.

3. Fixed method

The sensor is fixed to the installation surface with screws of specified size, and the installation hole position and size are detailed in the data manual to ensure installation reliability and consistency.

Typical application scenarios

The HPM series particulate matter sensors are widely used in the following fields:

1. HVAC system

In commercial and residential HVAC systems, sensors monitor indoor PM2.5 and PM10 concentrations in real-time, providing control basis for fresh air systems and air purification units, achieving on-demand ventilation and energy-saving operation.

2. Indoor air quality monitoring device

As the core sensing element of portable or fixed air quality monitoring devices, the HPM series provides accurate particulate matter concentration data, combined with temperature, humidity, CO ₂ and other sensors, to build a comprehensive indoor environmental monitoring solution.

3. Air purifier

Whether it is a household air purifier or a commercial air treatment equipment, the HPM series can provide real-time feedback on changes in particulate matter concentration and support wind speed adjustment and filter life prediction in automatic mode.

4. Vehicle mounted air purification system

The compact sensor has a small size and is suitable for integration into car air conditioning systems or in car air purifiers, providing a clean indoor air environment for drivers and passengers.

5. Industrial environment monitoring

With industrial grade EMC performance and wide temperature capability, the HPM series can also be applied to industrial environments such as factory workshops and clean rooms to assist in environmental control and occupational health monitoring.

Certification and Compliance

The HPM series sensors comply with the following standards and regulatory requirements:

RoHS: Compliance with the Restriction of Hazardous Substances Directive

REACH: Compliance with Chemical Registration, Evaluation, Authorization, and Restriction Regulations

Laser Safety: IEC/EN 60825-1 Class 1 Laser Product Safety Standard

Electromagnetic compatibility: CISPR 14, IEC61000 series

Installation and usage precautions

1. Prevent the accumulation of particulate matter

During installation, ensure that the inlet and outlet directions of the sensor are correct to avoid airflow obstruction. Sensors should be kept away from particulate matter emission sources to prevent dust from accumulating in the intake duct and affecting measurement accuracy.

2. Power supply design

To ensure stable operation of the sensor, the power supply design should meet the requirements of ripple and noise, and be equipped with recommended decoupling capacitor combinations. The power supply voltage should be strictly controlled within the range of 5 V ± 0.2 V.

3. Electrostatic protection

The sensor contains sensitive optical and electronic components inside, and electrostatic protection measures should be taken during installation and operation to avoid damage to the components caused by electrostatic discharge.

4. Not applicable to safety critical applications

The HPM series sensors are designed specifically for air quality monitoring and should not be used as safety or emergency shutdown devices, nor for critical control applications that may cause personal injury.