Online Nitrite Analyser
Track nitrite with a dedicated online method selected for the water matrix and range.
Online Nitrite Analyser with 3S
Nitrite monitoring can support water-treatment, wastewater and industrial process applications where changes need to be followed between manual samples. The 3S-CL carries out the configured reagent reaction and optical measurement on a programmed schedule. For chloraminated supplies, read our guide to nitrite monitoring in chloraminated drinking water.
Explore Wastewater Nitrate & Nitrite Monitoring before setting a sample point and reporting basis.
The analyser must be configured for nitrite rather than assumed to report nitrate or total oxidised nitrogen. PMA reviews the target measurand, expected concentration, interferences and sample presentation before specification. Explore the 3S-CL colorimetric analyser, review 3S applications or discuss sample preparation with PMA Support.
Repeatable online nitrite measurement in a compact analyser
The programmed sequence handles the sample and reagents automatically, allowing operators to review nitrite results and analyser status through the integrated touchscreen.
01 / NITRITE METHOD
Parameter-specific nitrite measurement
The configured 3S-CL runs a parameter-specific wet-chemistry sequence for nitrite, with the exact chemistry and range selected for the sample and monitoring objective.
- Parameter-specific wet-chemistry sequence
- Freely programmable analysis frequency
- Automatic result calculation
02 / AUTOMATIC ROUTINES
Calibration, validation and cleaning
Automatic routines can be scheduled at selectable intervals to support repeatable nitrite monitoring between planned maintenance visits.
- Automatic calibration
- Automatic validation
- Automatic cleaning
Nitrite analyser information
Core 3S-CL information for nitrite 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 nitrite monitoring
The 3S separates its electronic and wet compartments while keeping nitrite results, analyser status and configuration accessible through the colour touchscreen.
Touchscreen
Review nitrite 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
Reagent consumption is confirmed for the selected chemistry and programmed analysis frequency.
Nitrite analyser technical specifications
Core 3S-CL information for specification and application review.
| Measured parameter | Nitrite |
| Measurement principle | Parameter-specific colorimetric method using spectroscopic colour-development measurement |
| Measuring variables | Chemistry and range selected for the approved application |
| Analysis frequency | Approximately 6–20 minutes, depending on the selected parameter and chemistry |
| Power supply | 110–230 VAC, 50/60 Hz, 80 VA; optional 24 VDC |
| Operating conditions | 5–45°C; maximum 85% RH |
| Cabinet and protection | Epoxy-coated stainless steel; IP54 |
| Sample streams | One or two, with further expansion available through an optional sequencer |
| Outputs | 2 × 4–20 mA; Modbus RTU RS485 |
| Automatic functions | Calibration, validation and cleaning |
Parameter-specific chemistry, range and performance should be confirmed against the latest approved 3S documentation before procurement.
Discuss Your Nitrite Measurement
Provide the expected nitrite range, process location, sample characteristics and required analysis interval for a method review. Visit PMA, compare the PMA 3S product information, or read how a configurable colorimeter can help reduce operating expenditure.
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