Meta Description: Compare PM2.5 monitors and particle counters for factory dust, indoor air quality, filter testing and cleanroom applications in Malaysia.

PM2.5 Monitor vs Particle Counter for Factory and Cleanroom Malaysia

A PM2.5 monitor and an airborne particle counter both detect particles in the air, but they report different measurement results.

A PM monitor normally estimates particle mass concentration, such as PM2.5 or PM10, in units such as micrograms per cubic metre.

A particle counter counts the number of particles within selected size channels.

The correct instrument depends on whether the customer wants to evaluate air pollution and dust concentration or count particles for cleanroom, filtration and contamination-control applications.

What Does a PM2.5 Monitor Measure?

A PM monitor estimates the mass concentration of airborne particles within selected size categories.

Common outputs include:

• PM1

• PM2.5

• PM4

• PM10

• Total suspended particulate, depending on model

It is suitable for:

• Factory dust screening

• Indoor air quality

• Haze monitoring

• Warehouses

• Welding workshops

• Powder handling

• Construction dust

• Ventilation investigations

• Comparing indoor and outdoor air

It mainly answers:

“What is the estimated mass concentration of particles in the air?”

What Does a Particle Counter Measure?

A particle counter draws a defined volume of air through an optical sensing system and counts particles in selected size channels.

Typical size channels may include:

• 0.3 µm

• 0.5 µm

• 0.7 µm

• 1.0 µm

• 2.5 µm

• 5.0 µm

• 10.0 µm

It is suitable for:

• Cleanrooms

• Controlled manufacturing

• Filter testing

• Particle-source investigation

• Electronics production

• Pharmaceutical facilities

• Laboratories

• HVAC verification

• Clean-area monitoring

It mainly answers:

“How many particles of each selected size are present in the sampled air volume?”

Main Difference

PM2.5 Monitor

Reports:

• Estimated particle mass concentration

• PM2.5 and PM10

• Air-pollution trends

• General dust condition

• Often µg/m³

Particle Counter

Reports:

• Particle number concentration

• Counts by size channel

• Particle distribution

• Cleanliness and filtration information

• Counts per sampled volume

A PM2.5 value cannot be directly converted into a particle-count result without assumptions about particle size, density, shape and optical properties.

Temtop P600 PM2.5 and PM10 Monitor

The Temtop P600 is a portable particulate monitor focused on:

• PM2.5

• PM10

• Histogram or trend display

According to the official Temtop P600 product page, the instrument is designed for portable PM2.5 and PM10 monitoring.

It is suitable for customers who need:

• Straightforward dust screening

• Factory air-quality checks

• Warehouse inspection

• Haze monitoring

• Indoor and outdoor comparison

• Portable troubleshooting

• A lower-cost particle-focused meter

It is not a seven-channel professional particle counter.

Temtop PMD 331 Particle Counter

The Temtop PMD 331 is a seven-channel airborne particle counter.

The official Temtop information lists the following particle-size channels:

• 0.3 µm

• 0.5 µm

• 0.7 µm

• 1.0 µm

• 2.5 µm

• 5.0 µm

• 10.0 µm

Temtop lists applications including:

• Filter-efficiency measurement

• Industrial cleanrooms

• Indoor-air-quality pre-screening

• Locating particle sources

• Checking the effectiveness of repairs

The official PMD 331 product page provides the current manufacturer information.

Temtop PMD 371 Particle and Dust Monitor

The Temtop PMD 371 combines multi-channel particle counting with particle mass-concentration outputs.

According to the official Temtop PMD 371 product page, it detects seven particle sizes:

• 0.3 µm

• 0.5 µm

• 0.7 µm

• 1.0 µm

• 2.5 µm

• 5.0 µm

• 10.0 µm

It also measures mass-concentration outputs including:

• PM1

• PM2.5

• PM4

• PM10

• TSP

This makes the PMD 371 more suitable when the customer needs both particle counts and dust mass information.

P600 vs PMD 331 vs PMD 371

Choose Temtop P600 When:

• PM2.5 and PM10 are the main requirements

• General factory dust is being checked

• Haze monitoring is required

• The budget is limited

• Particle counts by size are unnecessary

Choose Temtop PMD 331 When:

• Seven particle-size counts are required

• Cleanroom or controlled-area monitoring is involved

• Filter performance is being investigated

• Particle-source location is important

• Mass-concentration channels are not the main requirement

Choose Temtop PMD 371 When:

• Both particle counts and mass concentration are required

• Professional dust assessment is performed

• PM1, PM2.5, PM4, PM10 and TSP are needed

• Industrial and controlled environments must be compared

• More comprehensive data is required

Which Instrument Is Suitable for Factory Dust?

For general factory dust investigation, the P600 may be sufficient when the objective is to:

• Compare production areas

• Identify PM peaks

• Check ventilation

• Monitor haze

• Investigate warehouse dust

• Compare before and after cleaning

Choose a higher-level PMD instrument when particle-size distribution or more detailed reporting is required.

Which Instrument Is Suitable for a Cleanroom?

A cleanroom commonly requires particle counts at specific particle sizes and sampled volumes.

A particle counter is therefore more relevant than a basic PM2.5 monitor.

However, before using any instrument for formal cleanroom classification, confirm:

• Required standard

• Particle-size channels

• Sample flow rate

• Sample volume

• Number of locations

• Measurement duration

• Data reporting

• Instrument performance requirements

• Required documentation

A seven-channel display alone does not automatically confirm that the instrument and procedure meet every formal cleanroom-classification requirement.

Filter-Efficiency Checks

A particle counter can compare particle counts:

• Upstream of a filter

• Downstream of a filter

• Before replacement

• After replacement

• At different airflow settings

• At several outlet points

The test method must consider:

• Sample location

• Airflow

• Particle concentration

• Sampling time

• Filter type

• Possible leakage

• Instrument coincidence limits

• Required standard

A simple PM monitor may show a general reduction but does not provide the same size-channel counting detail.

Particle Count vs Mass Concentration

Two environments can have similar PM2.5 mass readings but different particle counts.

For example:

• Many very small particles may produce a high count with modest total mass

• Fewer larger or denser particles may produce substantial mass with a lower count

This is why cleanroom particle counting and environmental PM monitoring are different measurement objectives.

Optical Measurement Limitations

Optical particle instruments may be affected by:

• Particle shape

• Refractive index

• Density

• Humidity

• Aerosol composition

• Concentration

• Sensor contamination

• Sampling airflow

• Coincidence at high counts

Results from two different instruments may not match exactly even when placed side by side.

The instruments should be compared according to their intended measurement output and performance specification.

Why Humidity Matters

High humidity can affect optical particle readings when moisture forms droplets or particles absorb water and grow.

Possible effects include:

• Higher apparent particle size

• Increased mass estimate

• Unstable readings

• Condensation on the sensor

• Contamination of the optical chamber

Avoid using an instrument outside its specified humidity conditions.

Sampling Location

Useful particle-monitoring locations include:

• Worker breathing zones

• Production lines

• Clean-area boundaries

• Supply-air outlets

• Return-air grilles

• Filter upstream and downstream points

• Warehouse aisles

• Powder-handling stations

• Background reference locations

The instrument should not be placed directly in a concentrated powder stream unless designed for that concentration and method.

Common Buying Mistakes

Buying a PM2.5 Monitor for Cleanroom Classification

Cleanroom applications normally require particle counts and defined sample volumes.

Buying an Expensive Particle Counter for Simple Haze Checks

A P600 may be sufficient for straightforward PM2.5 and PM10 monitoring.

Confusing PM0.3 with a Particle-Count Channel

PM notation and particle-count size channels are not automatically the same measurement.

Comparing Counts with µg/m³ Directly

The units describe different quantities.

Ignoring Sample Flow Rate

Flow rate affects how quickly the required sample volume is collected.

Using a Cleanroom Counter in Excessive Dust

High particle concentrations may overload the instrument or exceed its intended range.

Assuming More Channels Always Means Better

The required output should determine the model.

Which Instrument Should You Buy?

Buy the P600 When:

• General PM2.5 and PM10 screening is required

• The application is factory dust, warehouse air or haze

• Portability and simplicity are priorities

• The budget is limited

Buy the PMD 331 When:

• Particle counts by seven sizes are required

• Filter and clean-area checks are performed

• Particle-source investigation is important

• A professional particle-count display is needed

Buy the PMD 371 When:

• Particle counts and PM mass are both required

• More comprehensive industrial dust data is needed

• The user conducts higher-level air-quality assessments

• Data export and detailed reporting are priorities

Questions to Ask Before Buying

Before selecting an instrument, determine:

1. Do you need particle mass or particle counts?

2. Which size channels are required?

3. Is the application factory dust or cleanroom monitoring?

4. Is formal cleanroom classification involved?

5. What sample flow rate and volume are required?

6. What particle concentration is expected?

7. Is data export required?

8. Will filters be tested?

9. Is PM1, PM4 or TSP required?

10. What is the available budget?

These questions help determine whether the P600, PMD 331 or PMD 371 is the correct purchase.

PM Monitor and Particle Counter Supplier Malaysia

MTM Precision supplies Temtop P600, PMD 331, PMD 371 and other portable particle-monitoring instruments for factories, cleanrooms, warehouses and indoor-air-quality applications in Malaysia.

Contact MTM Precision with the required particle sizes, measurement units, sample application and reporting needs to discuss a suitable instrument.

Contact MTM Precision

MTM Precision Sdn. Bhd.

Showroom & Service Centre

No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia

🌐 Website: www.mtmpre.com.my
📧 Email: mtmpre@yahoo.com
📱 WhatsApp: +6016-660 7346