Apura s.r.l. builds online analysers that measure hardness, alkalinity, iron, silica and disinfectant residual continuously — and act on the result. Designed and manufactured in Italy under ISO 9001:2015.
Industrial pre-treatment and reverse osmosis water — how Apura online analysers give you real-time data. Hover any monitor for the instrument behind it, or select it to jump straight to the product.
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Five Apura measuring points on one line — every stage watched continuously, no grab samples, no waiting for the lab.
Manual testing catches a problem after it has already passed through the system. An online analyser measures on a set interval, holds the result against a threshold, and switches a relay before the damage reaches the next stage.
Hardness breakthrough after a softener scales a boiler or fouls an RO membrane. Measuring at the softener outlet raises the alarm while the fix is still cheap.
Triggering regeneration from an actual hardness reading rather than a timer saves salt, water and the hours spent running a cycle that was not needed.
Results, errors and timestamps write to SD card. When an auditor or a customer asks what the water was doing last Tuesday, the log answers.
The DUROMAT® colorimetric range does not estimate from a sensor drift curve. It runs a complete laboratory method on each measurement, then flushes and waits for the next one.
The inlet solenoid valve opens and sample water enters the measuring chamber.
The chamber is flushed for a settable time, clearing the previous sample.
Water transparency is checked to establish the optical zero point for this sample.
A peristaltic pump meters the indicator into the chamber.
The result displays, drives the 4–20 mA output and switches any relay whose threshold is crossed.
A final wash leaves the chamber clean until the next timed, volumetric, manual or external start.
If a reading only just exceeds the maximum, the analyser can repeat the analysis before raising an alarm — so a single anomalous sample does not trip a plant. Intervals are programmable from 3 to 9,999 minutes.
The same wet-chemistry cycle and the same chassis. What changes is the parameter each one measures — start from what you need to control.
| Model | Measures | Range | Outputs | Best suited to |
|---|---|---|---|---|
| DUROMAT® ProfessionalHardness & alkalinity | Total hardness, residual hardness, alkalinity | 0.22–534 ppm CaCO₃ 0.012–30 °dH |
4 relays · 4–20 mA · SD · MODBUS | Softener supervision, RO feed protection, boiler houses |
| DUROMAT® Professional FeIron variant | Iron (Fe²⁺/Fe³⁺) | 0.01–0.5 mg/l or 0.2–10 mg/l |
4 relays · 4–20 mA · SD · MODBUS RTU | Verifying iron removal ahead of softening or RO |
| DUROMAT® Diamond SilicaThree-reagent | Reactive silica (SiO₂) | 0.02–10.0 mg/l extendable via dilution |
4 relays · 4–20 mA · SD card | High-pressure boiler feedwater and demineralised polish |
The analyser for softener supervision and RO feed protection. Four relays and MODBUS make it the model for plant rooms that report upward.
The same chassis and cycle, configured for iron. Confirms an iron removal filter is still doing its job before the residue reaches resin or membrane.
Silica passes a softener untouched, carries over with steam and deposits on turbine blades where nothing dissolves it off. This is the gate that catches it.
The measurement is set by the probe you fit, not by the instrument you buy. Change the parameter later by changing the probe.
Free chlorine efficacy falls as pH rises. The compensated version reads the pH alongside and corrects the residual figure, so the number on the display reflects the disinfection you actually have.
Chlorine and chlorine dioxide probes are available in variants that hold up in seawater and in water carrying surfactants — relevant for coastal intakes and wash-down streams.
Hardness carryover scales tubes and silica deposits on turbine blades. Both are far cheaper to measure than to remove.
Confirm the resin is still working and regenerate on an actual reading instead of a timer.
Hardness and iron reaching the membrane shorten its life. Measuring at the feed protects the asset behind it.
Continuous disinfectant residual keeps biological control inside its window rather than swinging above and below it.
Residual monitoring across hotel, hospital and campus distribution, with pH-compensated free chlorine.
Process water quality control and verification of peracetic acid concentration on clean-in-place lines.
Silica and conductivity monitoring on demineralised and polished loops where specification is tight.
Free chlorine, chlorine dioxide, bromine or ozone residual, with the probe matched to the treatment in use.
Send us your parameter, expected range and sample conditions — temperature, pressure and where the tapping point sits — and we will come back with the model and reagent that fit.