Online Sulphate Analyser
Use a dedicated turbidimetric sequence for online sulphate measurement in suitable water applications.
Online Sulphate Analyser with 3S
The 3S sulphate method uses controlled barium sulphate precipitation and an optical reading to monitor sulphate in drinking water, wastewater, raw water and suitable process applications. Sample conditioning helps maintain the suspension during the programmed measurement sequence.
The appropriate cell, dilution arrangement and measuring range depend on the expected sulphate concentration and sample condition. PMA confirms the final configuration against the current parameter documentation; a disputed upper-range figure is deliberately not published here. Explore the 3S-CL colorimetric analyser, review 3S applications or discuss sample preparation with PMA Support.
Repeatable online sulphate measurement in a compact analyser
The programmed sequence handles the sample and reagents automatically, allowing operators to review sulphate results and analyser status through the integrated touchscreen.
01 / SULPHATE METHOD
Parameter-specific sulphate measurement
The configured method precipitates sulphate as barium sulphate, maintains the suspension with conditioning reagent and measures turbidity at 430 nm.
- Turbidimetric barium sulphate method
- 6–8 minute complete cycle
- Freely programmable analysis frequency
02 / AUTOMATIC ROUTINES
Calibration, validation and cleaning
Automatic routines can be scheduled at selectable intervals to support repeatable sulphate monitoring between planned maintenance visits.
- Automatic calibration
- Automatic validation
- Automatic cleaning
Sulphate analyser information
Core 3S-CL information for sulphate method and installation review. The final chemistry, range and sample arrangement should be confirmed for the application.
Flexible installation
Wall or rack mounting is supported in the standard vertical arrangement.
Defined sample handling
A pressure-free sample reservoir presents flow to the analyser.
Process integration
Analog outputs and Modbus RTU RS485 support plant integration.
Operator records
The integrated datalogger supports USB result export.
Designed for practical sulphate monitoring
The 3S separates its electronic and wet compartments while keeping sulphate results, analyser status and configuration accessible through the colour touchscreen.
Touchscreen
Review sulphate results, status information and analyser functions.
Automatic routines
Calibration, validation and cleaning run at selectable intervals.
Separate compartments
Electronic and wet-chemistry sections are physically separated.
Low reagent use
The datasheet states 2 L per reagent for the 16 mm cell or 3 L for the 26 mm cell every 30 days at a 15-minute analysis frequency.
Sulphate analyser technical specifications
Core 3S-CL information for specification and application review.
| Measured parameter | Sulphate, SO4²− (ppb, ppm, mg/L) |
| Measurement principle | Differential absorbance using a turbidimetric barium sulphate method |
| Optical wavelength | 430 nm |
| Measuring range | Cell and dilution configuration must be confirmed because supplied source material contains conflicting upper-range statements |
| Reproducibility | 26 mm cell: ±0.5 ppm or ±5%; 16 mm cell: ±1 ppm or ±5%, whichever is greater |
| Cycle time | 6–8 minutes, including conditioning and rinsing |
| Sample conditions | Pressure-free vessel; 5–50°C; 80–500 mL/min |
| Sample streams | One or two with the integrated switching valve |
| Power supply | 100–240 VAC, 50/60 Hz; optional 24 VDC; maximum 80 VA |
| Outputs | 2 × 4–20 mA and Modbus RTU RS485 |
| Installation | Wall mount as standard; bench-top or panel-mount options |
| Protection and environment | IP54; 5–45°C; 10–90% RH for indoor use |
| Dimensions and weight | 604 × 380 × 242 mm; approximately 20 kg |
| Automatic functions | Selectable validation, cleaning and calibration intervals |
The final sulphate range must be confirmed against approved current documentation before procurement; the conflicting supplied upper-range statements are not reproduced as a sales claim.
Discuss Your Sulphate Measurement
Share the expected sulphate concentration, water matrix, solids loading and required analysis frequency so the method and sample handling can be reviewed. Visit PMA, compare the PMA 3S product information, or read how a configurable colorimeter can help reduce operating expenditure.
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