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.
| 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 |
| On/Off threshold control | optional | optional | optional |
| Advanced control (e.g. PID) | optional | optional | optional |
| Color display | • | • | |
| Data logging and download | • | • | |
| Remote (Internet) access | optional | optional | |
| PROFIBUS, Modbus | 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 |
| Measured | Chlorine Dioxide |
| Probe Ranges | 0.01 – 2, 0.01 – 5, 0.01 – 10, or 0.01 – 20 mg/L |
| Resolution | 0.01 mg/L (ppm) |
| Reproducibility | ±5% |
| 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. |
| Replacement Intervals | |
| 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.