Thermo Scientific AquaSensors
™
AquaChlor
™
Free Chlorine Monitor User Guide
6
2.
PRODUCT DESCRIPTION
The Free Chlorine Measurement Systems are used for continuous monitoring of free chlorine in
applications where the chlorine concentration is between 0.05 ppm and 5 ppm or 0.05 ppm and 20 ppm.
The system also measures temperature from 0°C to 100°C.
The sensor head is pre-calibrated for span and the zero is factory set. The sensor retains calibration
values and does not require a new calibration when the system is connected to a new AV38 Display Unit,
PC, or PLC.
Any communications protocol that Thermo Fisher Scientific supports can be configured in this system by
plugging in one of many types of cabled communications adapters. All Thermo Scientific AquaSensors
communications adapters support measurement, calibration, configuration and diagnostics functions,
which can be accessed locally or remotely without an analyzer or controller electronics box.
The sensor in this system uses an amperometric measurement method with a gold cathode and a silver
anode. The electrolyte and membrane are easily replaced with a pre-stretched screw-on membrane cap.
Measurements are stable below 5 pH and are maintained in the pH window between 5 pH and 9 pH.
When pH compensation is used in conjunction with an AV38 local display, Hypochlorous acid or free
chlorine concentrations are automatically available when a chlorine sensor is connected.
• Modbus RTU
• Modbus 232
• Modbus TCP
• DeviceNet
• CANopen
• Ethernet/IP
• PCCC
• Web Browser
• USB
• RS-232
Plug-in Communications Adapters
• Retained calibration
• Screw-on membrane cartridge
• Simple electrolyte fill procedure
Plug-in Free Chlorine Sensor Head
