The HydroACT Chlorine Analyzer standard configuration includes version HA2 analyzer, 1 sensor (Free or Total Chlorine), 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 FeaturesHA2HA4HA8
Sensor limit*248
Analog output limit*248
Relay limit*4816
Digital Input limit*4816
On/Off threshold controloptionaloptionaloptional
Advanced control (e.g. PID)optionaloptionaloptional
Color display
Data logging and download
Remote (Internet) accessoptionaloptional
PROFIBUS, Modbusoptionaloptional

*Optional configuration limits. See above description for standard configuration of analyzer version & I/O setup. Optional configurations must be specified.

Sensor OptionsFree Cl, Total Cl, Cl Dioxide, Chlorite,
Ozone, ORP, pH with Temperature, DO,
Conductivity, SCM, UV254 Organics,
TSS/NTU, Particle Counter
Available Output TypesUniversal (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 userconfigurable 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.
EnclosureABS flame retardant, IP65, Nema 4X
Display4.3”, 480×272, 24 bit, grayscale
Optional: color (HA4 & HA8 only)
DimensionsHA2 & 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)
WeightHA2 & HA4 – 4.5 lbs (2 kg)
HA8 – 9 lbs (4 kg)
Warranty12 months from date of purchase

Chlorine Sensor Probe

TypeMembrane-covered amperometric three-electrode system
MeasuredFree residual chlorine or total residual chlorine
Probe Ranges0.01 – 2, 0.01 – 5, 0.01 – 10, or 0.01 – 20 mg/L
0.01 – 200 mg/L (Free residual chlorine only)
Resolution0.01 mg/L (ppm)
Stability-2% per month (without calibration)
Working ElectrodeGold cathode
Counter ElectrodeStainless steel anode
Reference ElectrodeSilver/silver halide
Flow Rate15 to 60 L/hr.
Temperature Range> 41° up to < 113° F (> 5 up to < 45° C)
Temperature CompensationAutomatically by integrated thermistor (ATC)
pH RangepH 4 – pH 9 (Free), pH 4 – pH 12 (Total)
Permissible Over-Pressure7.25 psi (0.5 bar)
First Polarization Time120 min.
Re-Polarization Time30 min.
Zero-Point AdjustmentNot necessary
 CalibrationManual using DPD
 Housing MaterialPVC, silicone, polycarbonate, stainless steel
 DimensionsDiameter approx. 0.98 in., length 6.89 in.
Replacement Intervals
Membrane:Annually (approx.) depending on water quality
Electrolyte:3 – 6 months
 InterferencesOzone and chlorine dioxide. 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.