DataStick Aquachlor Chlorine Sensor

  • Accurate Results Accuracy delivered between 4-9 pH
Product Options


The Thermo Scientific AquaSensors AquaChlor free Chlorine sensor will measure accurately in clean water processes between 4 and 9 pH. Best performance is achieved when used in applications where process pH, flow, pressure and temperature are stable. When used with the Thermo Scientific AV38 Local Display/Controller and a pH DataStick sensor, measured hypochlorous acid (HOCl) and hypochlorite ion (OCl-) concentrations can be used to determine free chlorine levels present.

Features of the AquaChlor Monitoring System include an easyto-replace sensor membrane cap, temperature compensation, a turn-key reagent free design and a compact mounting footprint.

For optimum measurement performance the unique flow chamber maintains regulated pressure and flow. The AquaChlor Free Chlorine Monitoring System is also EPA compliant according to Method 334.0.

Manufactured by: Thermo Scientific
Model: DataStick Aquachlor Chlorine Sensor

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Drinking water production and distribution
Monitoring sanitised process water
Monitoring sterilisation of glassware
Chlorine detection during reverse osmosis / ultrapure water


Measurement System Performance
Ranges 0 to 5 ppm and 0 to 20 ppm
Resolution 0.005 ppm
Accuracy 2% or ±10 ppb (whichever is greater)
Step Response Time 90% in 90 seconds
Operational Environment
Temperature Range 0 °C to 45 °C (32 °F to 113 °F)
Maximum Pressure 15 psig @ 45 °C
System Flow Rate in Chamber 200 to 250 mL/min
Free Chlorine
When chlorine and pH DataSticks are connected to the AV38 local display, HOCl and ClO- dissociation curves are pH compensated and used to calculate free chlorine present. A stable pH value can also be entered manually.
Power Requirements †
Voltage Range 10 to 30 VDC
Maximum Power 200 mW
Typical Power 120 mW
Process Electrodes Gold cathode, silver anode
Membrane PTFE/FEP
O-rings Viton®
Sensor Head Material Noryl®
DataStick Material PEEK or CPVC
Weight 1.2 lbs
Units of Measure
Measurement Units ppm, free chlorine
Temperature Units °C, °F
Calibration ‡
Sample 1 point
Zero 1 point
Temperature point
Other Configuration Options
Sensor Filter 0 to 100 seconds
Temperature Filter 0 to 100 seconds
Approvals and Ratings
Immunity & Emissions CE Certified 89/336/EEC:
CISPER 11, EN61000 (-4-2,-4-3,-4-4,-4-6, 4-8)
Safety cULus Listed; 367G E303570
Hazardous Locations Haz Loc Class 1, Division 2,
Groups A, B, C, D. Max Ambient 50 °C
† Note: Class II DC power supply required
‡ Note: Precalibrated at the factory


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