Explore the Royce Aqua 22
Measure mixed liquor suspended solids and sludge blanket depth with one rugged handheld instrument. The Royce Aqua 22 gives wastewater operators fast, dependable tank-side readings for routine process control in aeration basins, secondary clarifiers, SBR systems and return activated sludge applications.
The lightweight grip design and thumb-reach controls make the Aqua 22 practical to operate during routine field checks. Its high-clarity display is designed for outdoor use in bright conditions, helping operators read MLSS concentrations and sludge interface depth clearly at the point of measurement.
Smart serialised sensors retain their own calibration data, allowing compatible sensors to be exchanged between handheld units without recalibrating the meter. Readings can also be stored across nine locations with date and time stamps, supporting more consistent monitoring and traceable wastewater process records.
For a broader overview, read PMA’s guide to handheld sludge blanket level monitors and meters.
Portable MLSS & Sludge Blanket Meter
01.
Measure sludge blanket depth
Use the pressure-based depth sensor to identify sludge blanket position from 0 to 10 metres.
02.
Measure suspended solids
Take practical MLSS and suspended-solids readings from 0 to 20,000 mg/L.
03.
Work confidently in the field
Use a rechargeable handheld meter with a daylight-readable display and interchangeable serialised sensors.
Royce Aqua 22 Portable MLSS and Sludge Blanket Level Meter
£4,290.00 exc.VAT
The Royce Aqua 22 is a rugged, portable instrument for measuring mixed liquor suspended solids (MLSS/TSS) concentration and sludge blanket depth in wastewater treatment applications.
Its lightweight handheld design, sunlight-readable display and 10-metre submersible sensor cable make it ideal for daily tank-side monitoring. The Aqua 22 measures suspended solids from 0 to 20,000 mg/L and sludge blanket depth from 0 to 10 metres.
Suitable applications include aeration basins, secondary clarifiers, activated sludge plants, sequencing batch reactors and return activated sludge monitoring.

Aqua 22 features for routine field measurement
Aqua 22 combines the measurements operators need for routine wastewater process checks in one portable instrument.
Depth and concentration together
Locate the sludge blanket and record suspended-solids concentration without carrying separate handheld instruments.
Serialised sensor technology
Interchangeable sensors retain their own calibration information for straightforward instrument setup and practical field use.
Daylight-readable display
The clear handheld display is designed for outdoor reading during routine tank checks.
Rechargeable and portable
A lightweight rechargeable instrument helps teams move between sampling points and treatment assets.
UK service and support
PMA provides product selection, application guidance, service and calibration support from the United Kingdom.
Depth and suspended-solids measurement
Aqua 22 combines the measurements operators need for routine wastewater process checks in one portable instrument.

Measure sludge blanket depth
Use the pressure-based depth sensor to identify sludge blanket position from 0 to 10 metres.
Measure suspended solids
Take practical MLSS and suspended-solids readings from 0 to 20,000 mg/L.
Work confidently in the field
Use a rechargeable handheld meter with a daylight-readable display and interchangeable serialised sensors.
THE ROYCE AQUA 22 GIVES WASTEWATER OPERATORS A FASTER, CLEARER WAY TO MEASURE MLSS AND SLUDGE BLANKET DEPTH AT THE TANK SIDE. COMBINING SUSPENDED SOLIDS MEASUREMENT FROM 0 TO 20,000 MG/L WITH INTERFACE DEPTH MEASUREMENT UP TO 10 METRES, THIS RUGGED PORTABLE INSTRUMENT SUPPORTS CONFIDENT DAY-TO-DAY PROCESS CONTROL ACROSS AERATION BASINS, SECONDARY CLARIFIERS, SBR SYSTEMS AND RETURN ACTIVATED SLUDGE APPLICATIONS.
Measure two essential wastewater parameters with one lightweight handheld system. Discover how the Royce Aqua 22 can simplify routine monitoring and support faster operational decisions.

Applications and technical capabilities
The Royce Aqua 22 is designed for routine portable measurement across municipal and industrial wastewater treatment processes. Its combined MLSS, suspended solids and sludge blanket depth capability allows operators to complete essential tank-side checks using one rugged handheld system.
| Applications | Features |
|---|---|
| Aeration basins | Measure mixed liquor suspended solids for routine activated sludge process control. |
| Secondary clarifiers | Identify sludge blanket depth and monitor interface position before carryover occurs. |
| Sequencing batch reactors | Check suspended solids concentration and settling performance during treatment cycles. |
| Return activated sludge | Measure solids concentration in RAS lines and support sludge return control. |
| Municipal wastewater treatment | Carry out fast, repeatable tank-side checks across treatment works. |
| Industrial wastewater treatment | Support day-to-day monitoring where suspended solids and sludge depth affect process stability. |
Technical features
- Measures MLSS and TSS from 0 to 20,000 mg/L
- Measures sludge blanket depth from 0 to 10 metres
- Combines suspended solids and interface depth measurement in one portable instrument
- Hydrostatic depth sensing for straightforward sludge blanket measurement
- Smart serialised sensors store calibration data internally
- Sensors can be interchanged between compatible handheld meters without recalibration
- Lightweight pistol-grip design for practical one-handed operation
- Thumb-reach controls for quick function selection
- High-clarity LCD designed for use in bright sunlight
- Display remains readable with or without polarised safety glasses
- Stores readings across nine locations
- Date and time stamping supports traceable field records
- Supplied with a 10 metre polyurethane cable as standard
- IP65 handheld instrument and IP68 submersible sensor
- Approximately 320 g handheld weight
- Infrared absorption measurement principle
- Accuracy of approximately ±5% with 1% repeatability
Safe and reliable shipping to the UK and Europe.
We ship orders from the United Kingdom by courier, for the fastest & most reliable service.

