Alkalinity Analyzer

with HydroACT Multiparameter Analyzer

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touchscreen hi-res Color Display

LIVE
titration
charting

Data logging and
export

multilingual
(english, spanish, etc.)

Introducing Chemtrac’s Alkalinity Analyzer, a revolutionary solution for measuring total alkalinity online that sidesteps the limitations of traditional methods.

Ready to operate straight out of the box, the Alkalinity Analyzer is ideal for continuous monitoring in applications like swimming pools, water treatment plants, and cooling towers, simplifying online alkalinity measurement with unmatched ease and reliability.

  • Water Treatment
  • Cooling Towers
  • Swimming Pools
  • Expandable with other sensors (pH, NTU, etc.)
  • Color display and data-logging with microSD
  • card download
  • Modbus or Profibus comms
  • Stable and reliable – no calibration required
  • Single inexpensive reagent, typically 2 months life
  • Easy and simple maintenance

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Overview

Videos

Q & A

Specifications

Downloads

Overview

Introducing Chemtrac’s Alkalinity Analyzer, a revolutionary solution for measuring total alkalinity online that sidesteps the limitations of traditional methods. Traditional online alkalinity measurement techniques, such as titration to a specific pH or colorimetric methods, suffer from frequent maintenance requirements, including the need for regular calibration and cleaning of pH sensors, or the continuous replacement of costly reagents. These methods not only entail high initial purchase costs but also ongoing
operational expenses.

Using conductivity to detect the titration endpoint, total alkalinity is calculated based on the amount of acid required to neutralize all the alkalinity. This innovative method eliminates the need for calibration and frequent reagent
replacement, making it a cost-effective and user-friendly solution. Ready to operate straight out of the box, the Alkalinity Analyzer is ideal for continuous monitoring in applications like swimming pools, water treatment plants, and
cooling towers, simplifying online alkalinity measurement with unmatched ease and reliability.
Digital control panel for water monitoring

dashboard

sensor screen

chart view

diagram screen

3D Model View

Videos

Q & A’s

The Chemtrac HydroACT Alkalinity Analyzer continuously measures total alkalinity in water, expressed in milligrams per liter as calcium carbonate (mg/L CaCO₃). It is designed specifically for process applications where a live alkalinity signal is needed for control, rather than occasional grab‑sample testing.

The standard operating range is 10–1000 mg/L as CaCO₃, covering low‑alkalinity soft waters through highly buffered systems. Within this range the analyzer maintains good accuracy and reproducibility, making it suitable for both municipal and industrial applications.

No, it does not rely on a pH probe; instead, it uses a conductivity sensor to follow the progress of an automatic acid titration. This eliminates typical pH‑electrode problems like drift, fouling, frequent calibration, and regular probe replacement.

Routine calibration of the alkalinity measurement is not required because the analyzer detects the titration endpoint from the shape of the conductivity curve, not from an absolute sensor value. That design greatly reduces operator workload and minimizes the risk of errors from poor or infrequent calibration.

The system typically uses PTSA (paratoluenesulfonic acid) as the titrant, which reacts with all forms of alkalinity during the automated titration. Using a single standardized reagent simplifies inventory, handling, and replacement compared with multi‑reagent colorimetric systems.

Under normal operating conditions, the reagent life is typically on the order of two months before replacement is needed. Actual intervals depend on sample alkalinity and titration frequency, but the design aims to keep consumable changes infrequent and predictable.

Key advantages are low maintenance, no pH electrode, and only one relatively inexpensive reagent, all while providing stable, repeatable measurements. This lowers total cost of ownership and gives operators a robust alkalinity signal they can trust for automated control.

Yes, the HydroACT platform can be fitted with 4–20 mA outputs and digital communication options such as Modbus or Profibus. These interfaces allow easy connection to SCADA, PLCs, and remote monitoring systems for alarms, trending, and automatic chemical dosing.

Specifications

Features

Description

  • Parameter

    Total Alkalinity

  • Range

    10-1000 mg/L CaCO 3

  • Probe Ranges

    ± 5% of measured value or
    ± 1 mg/L CaCO (whichever is greater)

  • Reproducibility

    <2% of measured value or 1 mg/L CaCO 3 (whichever is greater)

  • Lower Limit

    10 mg/L CaCO 3

  • Typical Titrant

    PTSA (Paratoluenesulfonic Acid

HydroACT Features

HA2

HA4

HA8

  • Sensor limit*

    2

    4

    8

  • Analog output limit*

    2

    4

    8

  • Relay limit*

    4

    8

    16

  • Digital Input limit*

    4

    8

    16

  • Isolated universal I/O

    •

    •

    •

  • Nema 4X/IP65

    •

    •

    •

  • Wall & panel mount

    •

    •

    •

  • Multilingual

    •

    •

    •

  • High resolution display

    •

    •

    •

  • Graphical trending

    •

    •

    •

  • On/Off threshold control

    optional

    optional

    optional

  • Advanced control (e.g. PID)

    optional

    optional

    optional

  • Color display

    •

    •

  • Customizable data logs

    •

    •

  • MicroSD card download

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    •

  • Remote (Internet) access

    optional

    optional

  • PROFIBUS, Modbus

    optional

    optional

*Sensors, I/O, and relays are all optional and must be specified at time of ordering.

Downloads

Title Category Upload Date File Size Download
PDF Alkalinity Datasheet
Alkalinity Dec 31, 2025 476 KB Download
PDF

Alkalinity Datasheet

476 KB
Alkalinity
December 31, 2025
Download