The HydroACT Reagentless Chlorine Dioxide Analyzer is one of our online disinfection monitoring solutions. Just like with the other HydroACT series products, our Chlorine Dioxide (ClO2) sensor is simple to install, and extremely reliable. The membrane covered probe is exceptionally stable for chlorine dioxide measurement, and requires no zero calibration. The vented flow cell allows for ideal sample flow to give the best detection results. Not needing reagents, the system requires minimal maintenance, and hence has lower overall lifetime costs than competitors’ products. The analyzer can be used for simple monitoring, as well as for controlling the Chlorine Dioxide dosage and maintaining the target residual.
HydroACT analyzers and controllers offer versatile solutions for your disinfection monitoring needs, with the flexibility to accept additional sensors, as well as offering expandable I/O, and PID control loops.
The Chlorine Dioxide Analyzers can be used for whatever water applications where chlorine dioxide residuals need to be monitored and/or controlled. They consist of a HydroACT multi-parameter analyzer, a chlorine dioxide probe sensor, and a sample flow cell.
There are options for the HydroACT configurations depending on how many sensor inputs are necessary, output and communication needs, and control requirements.
Standard flow cells are for a single probe. There are also options for two and three probe flow cells.
The HydroACT Chlorine Dioxide Analyzer standard configuration includes version HA2 analyzer, 1 sensor, 1 analog output, and 1 year
consumables. Optional features include relays, digital inputs, digital comms, expanded number of sensor inputs and analog outputs, color display, and data
download capability. Maximum I/O capabilities and certain features are specific to the different versions of HydroACT as detailed below.
|Analog output limit*||2||4||8|
|Digital Input limit*||4||8||16|
|On/Off threshold control||optional||optional||optional|
|Advanced control (e.g. PID)||optional||optional||optional|
|Data logging and download||•||•|
|Remote (Internet) access||optional||optional|
*Optional configuration limits. See above description for standard configuration of analyzer version & I/O setup. Optional configurations must be specified.
|Sensor Options||Free Cl, Total Cl, Cl Dioxide, Chlorite,
Ozone, ORP, pH with Temperature, DO,
Conductivity, SCM, UV254 Organics,
TSS/NTU, Particle Counter
|Available Output Types||Universal (0-20mA, 4-20mA, 0-10 VDC)|
|Relays (optional)||SPST electromechanical relays rated for 380 VAC, 6A max.|
|Alarms & Thresholds:||user-configurable alarms and 2 user-configurable thresholds (for control)|
|Chemical Feed Control (optional)||HA4 & HA8 only – PID, Feed Forward, Flow Proportional, Timer – multiple loops|
|Communication (optional)||Modbus ASCII/RTU (RS485), Modbus TCP (Ethernet), Profibus DP|
|Data Logging (optional)||Customizable data logs. 1 million records can be logged internally, and downloaded to MicroSD card.|
|Enclosure||ABS flame retardant, IP65, Nema 4X|
|Display||4.3”, 480×272, 24 bit, grayscale
Optional: color (HA4 & HA8 only)
|Dimensions||HA2 & HA4 – 9.0” W x 12.2” H x 4” D
(230 mm W x 309 mm H x 1035 mm D)
HA8 – 18.0” W x 12.2” H x 4” D
(460 mm W 309 mm H x 1035 mm D)
|Weight||HA2 & HA4 – 4.5 lbs (2 kg)
HA8 – 9 lbs (4 kg)
|Warranty||12 months from date of purchase|
Chlorine Dioxide Sensor Probe
|Type||Membrane-covered amperometric three-electrode system|
|Probe Ranges||0.01 – 2, 0.01 – 5, 0.01 – 10, or 0.01 – 20 mg/L|
|Resolution||0.01 mg/L (ppm)|
|Stability||-2% per month (without calibration)|
|Working Electrode||Gold cathode|
|Counter Electrode||Stainless steel anode|
|Reference Electrode||Silver/silver halide|
|Flow Rate||15 to 60 L/hr.|
|Temperature Range||> 41° up to < 113° F (> 5 up to < 45° C)|
|Temperature Compensation||Automatically by integrated thermistor (ATC)|
|pH Range||pH 2 – pH 11|
|Permissible Over-Pressure||7.25 psi (0.5 bar)|
|First Polarization Time||120 min.|
|Re-Polarization Time||30 min.|
|Zero-Point Adjustment||Not necessary|
|Calibration||At the device, by analytical determination|
|Housing Material||PVC, silicone, polycarbonate, stainless steel|
|Dimensions||Diameter approx. 0.98 in., length 6.89 in.|
|Membrane:||Annually (approx.) depending on water quality|
|Electrolyte:||3 – 6 months depending on water quality|
|Interferences||Ozone and chlorine. Surfactants are partially tolerated|
*Not suitable for measuring or controlling for dechlorination. Recommended to have a chlorine residual of at least 0.10 ppm at all times.
Paper machine system microbial control
Having accurate, reliable, and real-time chlorine monitoring, both in the water treatment plant, and in the distribution system, is critical.
The Chemtrac Chlorine Analyzers take online disinfection monitoring to a new level of rleiability. They are accurate, pH independent, and offer a low cost of ownership with a full 12 months between maintenance events. These analyzers are suitable for regulatory reporting purposes when used in compliance with EPA Method 334.
Properly assembling the chlorine sensor is critical to the operation of the chlorine analyzer. This video demonstrates the appropriate way to set up the probe with the electrolyte, and the membrane cap. And this procedure also applies to other membrane-covered sensors, such as total chlorine, chlorine dioxide, chlorite, and ozone.
The chlorine sensor flow cell is designed to direct the proper sample flow past the membrane in order to ensure accurate and consistent results. This flow cell is also used with a variety of membrane-covered sensors such as free chlorine, total chlorine, chlorine dioxide, chlorite, and ozone.
A Water Treatment Plant in Auburn, AL has the need to monitor free chlorine onsite, as well as at remote locations in the distribution system, where they do not want to have to use reagents. They fist ordered a Chemtrac Reagent-less Free Chlorine analyzer in 2009, and have since purchased several more for other monitoring locations.