LSI LASTEM PRPMA3100 Particulate Sensor User Guide

LSI LASTEM PRPMA3100 Particulate Sensor

Specifications

• Model: PRPMA3100
• Output Protocol: Modbus RTU
• Sampling frequency: Not specified
• Power supply: Not specified
• Particulate matter: PM1, PM2.5, PM10

Product Usage Instructions

Installation

1. Install the mounting bracket on a pole or wall using the provided accessories.
2. Secure the sensor onto the bracket.
3. Open the sensor cover carefully to access the internal components.
4. Connect the cable to the sensor terminal block.
5. Close the cover and tighten the retaining screws.

Communicating with the PRPMA3100
The PRPMA3100 communicates in real-time using the Modbus RTU protocol over an RS-485 communication port.

Using with LSI LASTEM Data Logger

1. Configure Alpha-Log to read PRPMA3100 sensor data using the 3DOM software.
2. Add the sensor model PRPMA3100 from the sensor library.
3. Check and adjust acquisition parameters as needed.
4. Save and send the configuration to the data logger.

Modbus RTU
The PRPMA3100 supports the Read Holding Register command with default configuration parameters as listed below:

• Baud rate: 9600 bps
• Parity: None
• Stop Bits : 2
• Device address: 0

PRPMA3100 Configuration

1. Disconnect the power supply to the sensor.
2. Connect the sensor to a PC using a USB-C/USB-A cable.
3. Identify and set up the COM port on the PC.
4. Configure the terminal emulator with appropriate settings.
5. Navigate through the menu on the PC to view or change parameters.
   Frequently Asked Questions (FAQ)
   

• Q: How can I check if the PRPMA3100 sensor is working properly?
  A: The status LED on the sensor indicates its operational status. A green light signifies that the sensor is on and functioning correctly, a blue light indicates communication in progress, and a red light indicates an error.

• Q: What type of particulate matter can the PRPMA3100 detect?
  A: The PRPMA3100 can detect PM1, PM2.5, and PM10 particulate matter concentrations simultaneously using light scatter measurement method

Environmental monitoring solutions

PM1, PM2.5, PM10 particulate sensor – Quick guide

Model PRPMA3100

Introduction

PRPMA3100 is a sensor for simultaneous detection of PM1, PM2.5, PM10 particulate matter. The determination of particulate concentration is based on the light scatter measurement method

 Technical specifications

• PM1-PM2.5: 0-100 μg/m³: ±5μm+5%; 100-1000 μg/m³: ±10%
•   PM10: 0-100 μg/m³: ±25μm, 100-1000 μg/m³: ±25%

General information| Enclosure| Polycarbonate and polyamide
Weight| 0.4 kg
Dimensions| 81 x 45 x 148 mm
Protection grade| IP65
Operative limits| -20÷60 °C, 0÷99% RH
Compatibility| Alpha-Log

Installation

For the installation, consider the following

Install the sensor far away from pollution sources that are very close and have insufficient air flow (such as chimneys, air conditioners, etc.) that may disrupt your readings.

• Install the sensor between 3 and 4 meters high.

• For optimal sensor performance, it is recommended to mount the device in a location that is not directly exposed to sunlight or receives as little sunlight as possible.To ensure proper operation, the sensor must be installed with the air inlet of the sensor facing downward.

  1. Install the mounting bracket on pole or wall. In the first case, fix it to the pole using the stainless-steel hose clamp  In the second case, attach the mounting bracket to the wall using two screws as shown in the figure

  2. Click onto the bracket the sensor.

  3. Unscrew the 4 screws that attach the sensor cover to the sensor.

  4. Open the cover be-ing careful not to tear the cable that connects it to the internal board.

  5. Insert the cable CCFFA3300/400/500 into the cable gland.

  6. Connect the wires of the cable to the sen-sor terminal block

  7. Close the cover and tighten the 4 retaining screws.

Communicating with the PRPMA3100

Real-time data access occurs through Modbus RTU protocol over RS-485 communication port.

Using with LSI LASTEM data logger
If the sensor is used with Alpha-Log, refer to DISACC240039 for the connection.
To configure Alpha-Log to read PRPMA3100 sensor data, use the 3DOM software. Proceed as follows:

• Open the configuration in use in the data logger.
• Add the sensor by selecting the model PRPMA3100 from the 3DOM sensor library.
• Check the acquisition parameters (input, rate, etc.).
• Save the configuration and send it to the data logger.For more information about the configuration, please refer to the manual of the data logger and the 3DOM online guide.
  PRPMA3100 particulate matter sensor – Quick guide
  LSI LASTEM SRL INSTUM_05589 Page 2 / 2

Using with a SCADA device
Connect PRPMA3100 sensor to the SCADA device. Use the Modbus RTU commands to read sensor data (§5).

Modbus RTU

Commands
PRPMA3100 sensor supports the Read Holding Register command (function code 0x03).

Default configuration parameters

• Baud rate: 9600 bps
• Parity: None
• Stop Bits: 2
• Device address : 0

Important constraints in serial parameters configuration
When setting up the Modbus parameters for the sensor, it’s important to note the relationship between parity and stop bits. Specifically, if you choose to operate without a parity bit (‘No Parity’), the configuration will require the use of 2 stop bits. Conversely, if you opt for including a parity bit (either ‘Even’ or ‘Odd’ parity), the system will automatically configure the number of stop bits to 1. This limitation is set by the Modbus library used by the firmware but is also what the Modbus specification defines as outlined in Modbus Specification 2.5.1.

Modbus registers map

*Floating point: IEEE 754 single-precision floating-point value.

6 PRPMA3100 configuration

A terminal emulator may be used for configuration of the PRPMA3100 sensor through its USB-C interface (CONFIG PORT). To access, open the sensor cover (§3).

1. Disconnect the power supply to the sensor.
2. Connect the sensor to the PC through a USB-C/USB-A cable. The status LED blinking.
3. On the PC, identify the serial port associated with the sensor (Control Panel -> System -> Hardware Setup).
4. Run the terminal emulator and set the COM port identified in the previous point.
5. Set 9600 bit per second, 8 data bits, parity none, 1 stop bits, flow control none. When the communication starts, the status LED remains lit and main menu appears.

Navigate the menu to view or change parameters. Diagnostic
PRPMA3100 is equipped with a status LED, which indicates the status of the sensor.
The status LED is visible from the outside and located at the top-right corner of the sensor’s base.

• Green: the sensor is on and working.
• Blue: communication in progress.
• Red: sensor is in error; try to disconnect and reconnect the power supply.

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