Royce Aqua 22 measurement parameters
Portable MLSS meter for wastewater treatment.
Measure mixed liquor suspended solids from 0 to 20,000 mg/L with a rugged portable instrument designed for routine activated sludge process checks.
Measure mixed liquor suspended solids at the tank side.
Mixed liquor suspended solids (MLSS) is the concentration of suspended biomass and other solids in an activated sludge aeration basin. Routine MLSS checks help operators understand the solids inventory present in the biological treatment process.
The Royce Aqua 22 provides a portable MLSS reading directly beside the tank. Its infrared absorption sensor measures suspended-solids concentration from 0 to 20,000 mg/L, helping teams make repeatable field checks without carrying a separate benchtop instrument to every sampling point.
What MLSS tells you, and how the Aqua 22 measures it.
The suspended-solids sensor converts an infrared absorption response into an MLSS concentration reading in mg/L, giving operators immediate information beside the aeration tank.
01 / MLSS MEASUREMENT
Infrared absorption measures MLSS concentration
The sensor passes infrared energy through mixed liquor. Suspended particles reduce the detected signal and the calibrated response is converted into an MLSS concentration reading from 0 to 20,000 mg/L.
- Immediate MLSS concentration reading at the tank side
- Designed for routine activated sludge process checks
- Approximately ±5% accuracy with 1% repeatability
02 / PROCESS USE
Use MLSS readings to support process checks
A consistent MLSS measurement routine helps teams compare solids concentration across sampling points and over time. The Aqua 22 stores readings against nine locations with date and time stamping for traceable field records.
- Supports aeration basin and mixed-liquor checks
- Smart serialised sensors retain calibration data internally
- Portable format supports checks across multiple treatment assets
A REPEATABLE MLSS CHECK
From mixed liquor sample to useful MLSS reading.
Use the same safe sampling position and operating method whenever possible so that changes in the MLSS reading reflect the process rather than the measurement routine.
01.
Prepare
Inspect the sensor and cable, connect the suspended-solids sensor, power the analyser and select TSS mode and the required stored location.
02.
Position
Use a safe, representative position. Return to the same sampling point whenever possible so that changes reflect the process rather than the location.
03.
Lower
Lower the IP68 suspended-solids sensor steadily into the mixed liquor. Keep the IP65 handheld analyser dry and above the tank.
04.
Read
Allow the reading to settle, then note the MLSS concentration in mg/L. Follow the same immersion position and timing for comparable routine checks.
05.
Record
Store the result against one of nine internal locations. Date and time stamping helps operators compare checks and build a traceable field record.
06.
Rinse
After measurement, withdraw and rinse the wetted sensor in line with site procedures. Regular inspection and calibration support dependable field performance.
Why choose the Royce Aqua 22 for portable MLSS checks?
Purpose-built field features help wastewater teams take, read and record MLSS measurements across treatment works.
MLSS and sludge depth in one system
Use TSS mode for MLSS concentration and LEVEL mode to identify the sludge interface and read its depth.
Calibration stays with the sensor
Each smart serialised sensor stores its calibration data internally for straightforward interchange between compatible handheld meters.
Clear readings outdoors
The high-clarity LCD is designed for bright outdoor conditions, with or without polarised safety glasses.
Lightweight field format
The approximately 320 g handheld supports practical one-handed operation between tanks and sampling points.
UK application and service support
PMA provides Royce Aqua selection, application guidance, service and calibration support from the United Kingdom.
Where portable MLSS measurement is used.
Portable MLSS measurement is used where operators need immediate mixed-liquor concentration information beside the process. The Royce Aqua 22 supports routine checks across municipal and industrial activated sludge treatment.
| Application | How the MLSS reading is used |
|---|---|
| Aeration basins | Check mixed liquor suspended solids concentration during routine activated sludge operation. |
| Sequencing batch reactors | Measure solids concentration during selected treatment-cycle stages using a consistent sampling routine. |
| Return activated sludge | Check suspended-solids concentration in RAS streams as part of routine process monitoring. |
| Municipal wastewater treatment | Carry out portable MLSS checks across multiple aeration tanks and treatment assets. |
| Industrial biological treatment | Support day-to-day monitoring where biomass concentration affects process stability. |
Portable MLSS meter specifications.
Key Royce Aqua 22 specifications relevant to portable MLSS measurement.
| Specification | Royce Aqua 22 |
|---|---|
| MLSS / TSS range | 0–20,000 mg/L |
| Measurement principle | Infrared absorption |
| Accuracy | Approximately ±5% |
| Repeatability | 1% |
| Handheld protection | IP65 |
| Sensor protection | IP68 |
| Handheld weight | Approximately 320 g |
| Standard cable | 10 m polyurethane |
| Data organisation | 9 locations with date/time stamping |
Specifications are based on the current PMA Royce Aqua 22 brochure and may be subject to product development. Confirm critical requirements with PMA before specification. For an overview of the complete portable measurement system, visit the Royce Aqua 22 product page.
