PACUM DT-9850M Professional Handheld Particle Counter

1. Introduction

The PACUM DT-9850M is a professional handheld particle counter designed for comprehensive air quality assessment. This device features a 2.8-inch color TFT LCD display and supports a microSD memory card for data storage. It provides fast, easy, and accurate readings for particle counts (PM0.3, PM2.5, PM10), HCHO (formaldehyde) levels, air temperature, and relative humidity. Additionally, it calculates dew point and wet bulb temperatures, making it a versatile instrument for environmental monitoring, industrial measurements, and data analysis.

2. Safety Information

• Read this manual thoroughly before operating the device.
• Do not expose the device to extreme temperatures, humidity, or direct sunlight.
• Avoid dropping the device or subjecting it to strong impacts.
• Do not attempt to open or modify the device; this will void the warranty and may cause damage.
• Use only the specified AC/DC adapter for charging.
• Keep the particle sensor and HCHO sensor free from dust and debris to ensure accurate readings.
• Dispose of batteries according to local regulations.

3. Product Overview

Familiarize yourself with the components of your DT-9850M device:

Image: Front and back view of the PACUM DT-9850M Particle Counter, highlighting its various components with numbered labels.

1. Particle Sensor: Inlet for air sampling to measure particle concentrations.
2. Color LCD Display: 2.8-inch TFT screen displaying measurement data, settings, and menu options.
3. Function Buttons (F1, F2, F3): Context-sensitive buttons for various functions displayed on the screen.
4. Page Up Button: Navigates upwards through menus or increases values.
5. Back Up (ESC) Button: Returns to the previous screen or cancels an operation.
6. Page Down Button: Navigates downwards through menus or decreases values.
7. Power ON/OFF Button: Turns the device on or off.
8. Measure (RUN/STOP) Button: Initiates or stops a measurement cycle.
9. Particle Counter (ENTER) Button: Confirms selections or enters sub-menus.
10. Temperature & Relative Humidity Sensor: Detects ambient air temperature and humidity.
11. USB Interface: For connecting to a computer for data transfer or firmware updates.
12. AC/DC Adapter Port: For connecting the power adapter to charge the battery or power the device.
13. HCHO Sensor: Detects formaldehyde gas concentrations.
14. Battery Cover: Provides access to the battery compartment.

4. Setup

4.1. Battery Installation and Charging

1. Locate the battery cover (14) on the back of the device.
2. Open the battery cover and insert the NiMH battery, ensuring correct polarity.
3. Close the battery cover securely.
4. Connect the AC/DC adapter to the adapter port (12) and plug it into a power outlet to charge the device before first use. The battery indicator on the display will show charging status.

4.2. MicroSD Card Installation

1. Locate the microSD card slot, typically near the USB interface (11).
2. Insert a microSD card (up to 8GB recommended) into the slot until it clicks into place. This card is used for storing measurement data.

4.3. Powering On/Off

• To power on, press and hold the Power ON/OFF button (7) until the display illuminates.
• To power off, press and hold the Power ON/OFF button (7) until the display shuts down. The device also features an auto-power-off function to conserve battery.

5. Operating Instructions

5.1. Navigating the Display

Image: Close-up of the DT-9850M's 2.8-inch color LCD display, showing real-time readings for particle sizes (2.5µm, 10µm), temperature, and humidity.

The 2.8-inch TFT color LCD display (2) provides a clear interface for viewing measurements and navigating settings. Use the Page Up (4), Page Down (6), ESC (5), and ENTER (9) buttons to move through menus and confirm selections. The F1, F2, F3 function buttons (3) perform actions indicated on the bottom of the screen.

5.2. Particle Counting

Image: The DT-9850M device showcasing its 4-in-1 capabilities, including Particle Counter (PM0.3, PM2.5, PM10), HCHO detector, Dew-point & Wet-bulb temperature, Air temperature & humidity, and Mass Concentration (PM2.5, PM10).

• From the main screen, select the Particle Counter mode.
• Press the Measure (RUN/STOP) button (8) to begin sampling. The device will draw air through the particle sensor (1).
• The display will show real-time counts for particle sizes: 0.3µm, 0.5µm, 1.0µm, 2.5µm, 5.0µm, and 10µm.
• Mass concentration for PM2.5 and PM10 will also be displayed.
• Press the Measure (RUN/STOP) button (8) again to stop sampling.

5.3. HCHO Detection

Image: The DT-9850M device in an indoor setting, displaying HCHO measurement results on its screen. Formaldehyde levels are a key indicator of indoor air quality.

• Navigate to the HCHO detection mode using the menu buttons.
• Ensure the HCHO sensor (13) is exposed to the air being tested.
• The device will display the formaldehyde concentration in parts per million (ppm).
• Note: The World Health Organization recommends indoor formaldehyde content not exceed 0.1 ppm.

5.4. Temperature and Humidity Measurement

• The device continuously monitors air temperature and relative humidity via the sensor (10).
• These readings are typically displayed on the main screen or a dedicated environmental parameters screen.
• Dew point and wet bulb temperatures are calculated and displayed based on the measured air temperature and humidity.

5.5. Data Storage and Retrieval

Image: The DT-9850M device in use, with text highlighting its capability to store 5000 sets of measurement data and support microSD card expansion for continuous record-keeping and environmental analysis.

• The DT-9850M can store up to 5000 records of data, including time, counts, relative humidity, temperature, sample volumes, alarms, and location labels.
• Ensure a microSD card is inserted for data logging.
• Access stored data through the device's menu system.
• Data can be transferred to a computer via the USB interface (11) for further analysis using compatible software.

6. Maintenance

6.1. Cleaning

• Wipe the device exterior with a soft, damp cloth. Do not use abrasive cleaners or solvents.
• Keep the particle sensor inlet (1) and HCHO sensor (13) clear of dust and obstructions. Use a soft brush or compressed air gently if needed.

6.2. Storage

• Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
• If storing for an extended period, remove the battery to prevent leakage.

7. Troubleshooting

8. Specifications

9. Warranty and Support

For warranty information and technical support, please refer to the documentation provided with your purchase or contact your retailer. Keep your proof of purchase for any warranty claims.