AWT420
Up to 2 analogue or digital sensors, Bluetooth/EZLink Connect, dual PID, SD archive and HART/Ethernet/PROFIBUS/MODBUS, depending on configuration.
ABB Continuous Water Analysis
Continuous water analysis
From a single sensor to a complete analytical system. Geyser IC selects the technology and can integrate sample conditioning, panels and SWAS/SCS systems.
Transmitter platform
AWT420 / AWT424
AWT424
Up to 4 digital or 2 analogue sensors, interchangeable sensor and communication modules, audit trail, Bluetooth, secure archive and industrial communications.
AWT440 · Limited lifecycle: ABB states that AWT440 has not been available for new installations since July 2026. AWT424 is the reference platform for new multi-channel applications; AWT440 service and spare parts remain supported.
ABB documentation
ABB datasheets and manuals
Download the documents for your model. Shared manuals, protocols and versions are identified in each document card.
AWT420
Universal two-input transmitter. Check modules and sensor compatibility.
AWT424
Universal multi-input transmitter for analogue or digital sensors, depending on configuration.
SWAS pH accessories · APL701 / 700 ULTRA
Ultrapure water pH/ORP panel and ABB flow chamber instructions for the 700 ULTRA series. Select tubing and fittings for the process conditions.
Parameters
Select the measurement
Explore the measurement principles and select the parameter required for your application.
pH / ORP
100 / 500 / 700 Series analogue and EZLink digital sensors for water, process and high-purity applications.
Explore pH / ORP
Conductivity
2-electrode, 4/6-electrode and toroidal technologies: from ultrapure water to chemical processes.
Explore conductivity
Dissolved oxygen
ADS420 optical, Navigator high-purity and AeroStar Ultra/Ultra Trace down to sub-ppb levels.
Explore dissolved oxygen
Turbidity / TSS
ATS430 for turbidity/TSS, and 4690/ATS410 for low-range drinking water applications.
Explore turbidity
Chlorine / disinfectants
ChloroStar Sensor and Cell for free/total chlorine and chlorine dioxide, with preassembled panels.
Explore chlorine
Silica
Navigator 600 AW641 for demineralisation, boiler/steam cycles and turbine protection.
Explore silica
Sodium
Navigator ASO500 for condensate, demineralisation plants and steam/water cycles at ppb levels.
Explore sodium
Phosphate
AW642 for boiler chemistry and AW636 for municipal wastewater and phosphate removal.
Explore phosphate
Specialist analysers / UviTec
Ammonia, metals, BOD/COD, TOC, UV254, nitrate, spectrum analysis and oil-in-water.
Explore specialist analysersWater analysis and SWAS accessories
Components that deliver the sample to analysers and probes under the required conditions.
- Flow chambers: flow-through cells and probe holders for in-line sample measurement.
- Sample tubing: stainless steel, PTFE/PFA and flexible tubing, with materials selected for temperature, pressure and chemical compatibility.
- Fittings and valves: compression fittings, isolation and flow regulation.
- SWAS conditioning: sample coolers, pressure reduction, filters and flow indicators.
- Cation columns: housings and resins for conductivity measurement after cation exchange.
We select materials, connections and configuration for the sample and connected instruments.
Request accessoriesGeneral best practice
A good analyser needs a representative sample
Avoid dead legs and points that do not represent the actual process.
Long tubing and low flow can turn a fast event into a reading that is already several minutes old.
Stabilise the sample within the sensor limits; SWAS applications require cooling and pressure reduction.
Many cells are sensitive to flow and bubbles; flow should be controlled and visible.
Variable drain backpressure affects several measurements and can cause bubbles or flooding.
Calibration, reagent replacement, cleaning and grab sampling should be possible without dismantling much of the panel.
Geyser IC integration · SWAS / SCS
We can develop panels and skids with sample coolers, pressure reduction, backpressure regulators, filters, rotameters/flow control, valves, instruments, analysers, wiring, P&IDs, bills of materials and FAT.
Explore system integrationFAQ
Frequently asked questions
AWT420 or AWT424?
AWT420 is the universal dual-channel transmitter for up to two sensors. AWT424 is the newer multi-input platform and supports up to four digital or two analogue sensors.
Is AWT440 still available for new installations?
No. ABB lists AWT440 in the Limited lifecycle phase from July 2026 and has replaced it with AWT424; service and spare parts continue.
Can a water analyser be installed directly on a high-pressure/high-temperature line?
Often not. In power/SWAS systems, the sample must be cooled, depressurised and brought to a stable flow before reaching most analysers.
Why can two identical analysers give different readings?
Sampling point, sample delay, temperature, flow, bubbles, contamination, calibration and sensor condition can cause differences even when both instruments operate correctly.
Can Geyser integrate a complete SWAS/SCS system?
Yes. We can integrate sample coolers, pressure reduction, flow control, valves, filters, analysers, wiring, drains, P&IDs, bills of materials and FAT.