Suspended Solids Monitoring in Cooling Tower Water Malaysia
Suspended Solids Monitoring in Cooling Tower Water Malaysia
Cooling-tower water may contain airborne dust, corrosion products, biological material and particles entering through the make-up water.
If these materials accumulate, they may contribute to deposits, blocked strainers and reduced water-system cleanliness.
A portable suspended-solids meter such as the Qiwei SS-500B can support routine screening and comparison across suitable cooling-water sampling points.
Where Do Suspended Solids Come From?
Possible sources include:
Airborne dust
Outdoor pollution
Rust and corrosion products
Pipe scale
Biological material
Make-up water
Construction dust
Process contamination
Poor filtration
Disturbed deposits
Inadequate basin cleaning
Open cooling towers are continually exposed to the surrounding air, making particle entry difficult to eliminate completely.
Why Monitor Suspended Solids?
Routine measurement can help maintenance and water-treatment teams:
Check make-up water
Monitor basin-water changes
Compare before and after filtration
Identify rising particle levels
Evaluate cleaning work
Investigate dirty strainers
Build maintenance trends
Select samples for laboratory analysis
Suspended-solids results should be reviewed together with other cooling-water parameters.
Suggested Sampling Points
Possible locations include:
Make-up water
Cooling-tower basin
Circulation-water line
Side-stream filter inlet
Side-stream filter outlet
Blowdown water
Water before cleaning
Water after cleaning
Use fixed, clearly identified sampling points for trend comparison.
Checking Make-Up Water
Make-up water introduces replacement water into the cooling system.
Measuring it provides a useful baseline for comparison with circulating water.
If the circulating-water reading rises while make-up water remains stable, investigate:
Airborne contamination
Corrosion products
Biological material
System deposits
Filter performance
Maintenance condition
Checking Side-Stream Filtration
A side-stream filter removes a portion of suspended material from the circulating water.
To evaluate it:
Collect a sample from the filter inlet.
Collect a sample from the outlet.
Use the same sampling procedure.
Measure both samples using consistent timing.
Record the filter condition.
Repeat the comparison over time.
A declining difference may indicate filter loading, media problems, bypass or maintenance requirements.
Checking Basin Cleanliness
Sediment may accumulate in the cooling-tower basin.
A sample collected directly from settled bottom material will not represent the normal circulating water.
For meaningful trend monitoring:
Use a fixed sampling depth.
Avoid collecting settled sludge unless it is the target.
Record whether the basin was recently disturbed.
Record cleaning and maintenance activity.
Compare results before and after cleaning.
Qiwei SS-500B Main Specifications
Measurement parameter: Suspended solids
Measurement range: 0–500 mg/L
Displayed resolution: 1 mg/L
Power supply: AC adaptor or five AA batteries
Sample bottles included: Two
Operation: Portable field or indoor use
Its portable format allows maintenance personnel to compare several locations using one instrument.
Suspended Solids vs TDS
These measurements provide different information.
Suspended Solids
Insoluble particles carried within the water and normally reported in mg/L.
Total Dissolved Solids
Dissolved substances commonly estimated through conductivity.
Cooling-water TDS may rise because dissolved minerals become concentrated, while suspended solids may rise because of dust, corrosion or biological material.
A TDS meter cannot directly measure suspended particles.
Suspended Solids vs Turbidity
Turbidity indicates water cloudiness and is normally reported in NTU or FNU.
Suspended solids are reported in mg/L.
The relationship depends on particle size, colour, shape and density. There is no universal conversion between NTU and mg/L.
Using both measurements may provide a broader view of cooling-water condition.
Other Cooling-Water Parameters
A cooling-water monitoring programme may also include:
pH
Conductivity
TDS
Temperature
Turbidity
Corrosion-related parameters
Microbiological testing
Treatment-chemical checks
The required parameters depend on the system, treatment programme and water-management plan.
Sample-Handling Procedure
For consistent suspended-solids readings:
Flush the sampling point where appropriate.
Collect the sample in a clean container.
Mix it gently.
Avoid introducing air bubbles.
Fill a clean measuring bottle.
Wipe fingerprints and water droplets from the outside.
Measure before particles settle.
Record the sampling point and operating condition.
Clean the bottle immediately after testing.
Do not collect hot or unsafe samples without following the facility’s safety procedure and instrument limitations.
Common Causes of Unstable Results
Air bubbles in circulating water
Rapidly settling corrosion particles
Dirty measuring bottles
Different sampling depths
Recent basin disturbance
Changing make-up water
Filter backwashing
Strong sample colour
Different measurement timing
Instrument verification issues
Repeat unusual results using a freshly collected sample.
Portable Screening and Laboratory Testing
The SS-500B can support:
Routine maintenance checks
Filter comparison
Troubleshooting
Cleaning evaluation
Trend monitoring
Specialised chemical, microbiological or compliance analysis may still require an appropriate laboratory method.
Confirm the required procedure with the water-treatment specialist, laboratory or facility requirement.
Is the SS-500B Suitable?
The SS-500B may be suitable when:
The expected concentration falls within 0–500 mg/L
Portable testing is required
Results are needed in mg/L
Multiple sampling points must be compared
The main purpose is operational monitoring
Provide the sample type, expected range and application when requesting a quotation.
Contact MTM Precision
For the Qiwei SS-500B Portable Suspended Solids Meter, cooling-tower and water-quality instruments, technical consultation or quotation, contact:
MTM Precision Sdn. Bhd.
Professional Test & Measurement Solutions Partner in Malaysia
Website: www.mtmpre.com.my
Email: mtmpre@yahoo.com
WhatsApp: +6016-660 7346
Showroom & Service Centre
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.
Malaysia Coverage:
Selangor, Kuala Lumpur, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kedah, Perlis, Terengganu, Sabah and Sarawak.
15 Sep 2026
