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    อุปกรณ์วัด Control System (Free & Total Chlorine, pH, ORP & Temperature Analyzer )

    PCA 330

    Free & Total Chlorine, pH, ORP & Temperature Analyzer


    The HANNA PCA 300 series models are chlorine, bromine or iodine and pH, ORP and temperature process analyzers which continuously monitor a sample stream and control the dosing to adjust the chlorine, bromine or iodine content and pH.

    From drinking and wastewater treatment to the pool and spa sanitation, the monitoring of chlorine, bromine or iodine levels has an important bearing on public health as well as ROI and efficiency for heating system and industrial applications.

    The PCA 3X0 series monitors the free chlorine or total chlorine in the 0 to 5.0 mg/L range;
    The PCA 3X1 series monitors the bromine in the 0 to 10.0 mg/L range;
    The PCA 3X2 series monitors the iodine in the 0 to 12.5 mg/L range;

    In the DPD Colorimetric method, N, N-Diethyl-p-phenylene-Diamine indicator and a buffer are mixed with the sample. Free available chlorine oxidizes the DPD indicator reagent at a pH between 6.3 and 6.6 to form a magenta colored compound. The intensity of the resulting color is proportional to the concentration of chlorine in the sample. The purpose of the buffer solution is to maintain the proper pH.

    In total chlorine measurement (free available chlorine plus combined chloramines), potassium iodide is added. The chloramines in the sample cause the iodide ions to become iodine which reacts with free chlorine to oxidize the DPD indicator. A pH of 5.1 is required for this reaction. Thus total chlorine measurements require a different buffer solution containing potassium iodide. Once the chemical reaction is completed, the optical signal at 555 nm is compared to the signal measured through the sample before the reagents were added. From these measurements chlorine concentration is calculated and shown on the display.

    Indicator and buffer reagent bottles are placed directly into the instrument case. With a sampling period of 5 minutes, reagents need only to be replenished about once a month.
    Since chlorine, bromine and iodine effectiveness is closely tied with pH levels, HANNA has designed our new analyzers PCA 32X and PCA 33X with pH control and temperature and pH control, ORP monitoring and temperature respectively.

    PCA 32X and PCA 33X use the HI 1005 pH probe to continuously measure the pH of the sample stream in the range of 0 to 14 pH. The sample temperature is measured in the 5 to 75°C range. pH and temperature are displayed on the front panel, and the pH value is temperature compensated.

    PCA 33X uses the HI 2008 platinum ORP electrode to continuously measure the sample ORP value. The pH/temperature combined sensor and the ORP sensor are placed inside the case, directly in the sample stream.

    Measurement and Control Cycle

    The PCA has a control time cycle that can be set by the user according with the dimensions of the controlled system. The control process, dosing commands and alarms can be performed according to this time cycle. The range of cycle timing is from 3 to 90 minutes.

    Chlorine/Bromine/Iodine Control

    Four chlorine/bromine/iodine level set points can be adjusted by the operator: a proportional dosing set point, two alarm set points and a minimum level for dosing. The proportional dosing factor (1/Δ) is user selectable with a delta between 0.1 and 2 pH. Chlorine/ bromine/iodine dosing system controls a SPST relay. Each alarm can be enabled or disabled.

    pH Control

    Three pH level set points can be adjusted by the operator: a control set point and two alarm set points. The pH control mode is user selectable; on/off or proportional dosing. The proportional dosing factor (1/Δ) is user selectable with a delta between 0.1 and 2 pH. The on/off dosing hysteresis is user selectable between 0.05 and 2.00 pH. The pH dosing system controls a SPST relay.

    Each pH, ORP and temperature alarm can be enabled or disabled, and two alarm levels can be set by the user also for temperature and ORP. Alarm condition controls a SPDT relay. The system error feature activates a relay to signal the need for operator intervention. System error condition controls a SPST relay.

    Analog Output

    Two current outputs of 4-20 mA or 0-20 mA are available to drive external devices such as chart recorders. The analyzer can drive two dosing pumps through the 4-20 mA outputs for chloride and acid/alkali dosing. The analog output is fully programmable and can be proportional with chlorine concentration, pH, ORP or temperature value. The limits of the analog output is selectable for each parameter.


    The analyzers can store up to 3500 readings (at least 7 days at 3 minutes sampling interval), that can be available for consulting or downloading. Logged records contain the time stamp, full information about the parameter values and the alarm status at the time.

    Alarm and Warning System

    Through the system, users have the ability to enable or disable the low and high level of alarms for all parameters. The system also offers overdosing protection that generates an alarm if something within the system is not working properly. The system will stop processes until the error is corrected by the user. Time is displayed on the main panel and time related reminders are available for “old calibration”, “reagent expired”, and “SIM expired”. All these warnings are generated based on user settings.


    These controllers are offered in an easy to access, wall mounted casing that offers outstanding chemical, mechanical and temperature resistance.


    Range Free & Total Cl2 0.00 to 5.00 mg/L (ppm)
    pH 0.00 to 14.00 pH
    ORP 0 to 2000 mV
    Temperature 5.0 to 75.0 °C (41 to 167 °F)
    Resolution Free & Total Cl2 0.01 mg/L (ppm)
    pH 0.01 pH
    ORP 1 mV
    Temperature 0.1 °C
    Accuracy Free & Total Cl2 ±8% or ±0.05 mg/L whichever is greater
    pH ±0.05 pH
    ORP ±1 mV
    Temperature ±0.5°C
    Min. Detectable
    Level  0.05 mg/L (ppm)
    Input Impedance  1012 Ohm
    Calibration Free & Total Cl2 one point
    pH one or two point or in line calibration
    Sampling Rate Free & Total Cl2 adjustable from 3 to 90 minutes
    pH adjustable from 3 to 120 seconds
    Dosage Free & Total Cl2 proportional
    pH ON/OFF or proportional, relay or 4-20mA output
    Delta Free & Total Cl2 selectable from 0.1 to 5 mg/L (ppm)
    pH selectable from 0.1 to 2 pH (hysteresis adjustable from 0.05 to 2 pH)
    Recorder Output  4-20mA, 0-20mA
    PC Connectivity  RS485 port, galvanically isolated
    Baud Rate  1200, 2400, 4800, 9600 bps
    Data Logging  up to 3500 data points
    Alarm Relay  SPDT contact with 5A, 230V resistive load
    Dosing Relay  SPDT contact with 5A, 230V resistive load
    System Error  SPDT contact with 5A, 230V resistive load
    Inlet Pressure  0.07 to 4 bar with no external pressure regulator (for pressure exceeding four bar an external pressure regulator is required)
    Sample Flow  100 to 300 mL/min
    Sample Temperature  5 to 40°C (41 to 104°F)
    Sample Inlet/
    Outlet Connection  12mm (1/2″) male NPT fitting
    Drain Connection  10mm (3/8″) barb
    Power Supply  115 VAC ±10% or 230 VAC ±10%; 50/60 Hz; 20 VA
    Enclosure  NEMA-4X standard, molded fiberglass polyester with transparent Lexan window
    Dimensions/Weight  318 x 267 x 159 mm (12.5 x 10.5 x 6.25’’) / 5 kg (11 lb.) without reagents


    HI 1005  Flow-thru Monitoring pH Electrode with DIN Connection and 0.5 m Cable
    HI 2008  Flow-thru Monitoring ORP Electrode, Au Sensor, with matching pin, amplifier and DIN connection and 0.5 m cable
    HI 70460  Indicator solution for PCA 310, PCA 320 and PCA 330
    HI 70461  Buffer solution for PCA 310, PCA 320 and PCA 330
    HI 70450  Indicator solution for PCA series.
    HI 70451  Buffer solution for PCA series.
    HI 7004L  4.01 pH Buffer Solution
    1 x 500 mL bottle
    HI 7006L  6.86 pH Buffer Solution
    1 x 500 mL bottle
    HI 7007L  7.01 pH Buffer Solution
    1 x 500 mL bottle
    HI 7009L   9.18 pH Buffer Solution
    1 x 500 mL bottle
    HI 7010L  10.01 pH Buffer Solution
    1 x 500 mL bottle
    HI 7020L  ORP Test Solution at 200/275 mV (@20°C)
    1 x 500 mL bottle
    HI 7091L  Reducing Pretreatment Solution
    1 x 500 mL bottle
    HI 7092L  Oxidizing Pretreatment Solution
    1 x 500 mL bottle
    HI 70300L  Electrode Storage Solution
    1 x 500 mL bottle
    HI 7082  Electrolyte Solution, 3.5M KCl
    4 x 30 mL bottle
    HI 7061L  General Purpose Cleaning Solution
    1 x 500 mL bottle
    HI 92500  Windows® Compatible Software for Micro-processor-based Process Controllers
    Reagents & Standards
    HI 70481  Reagents set for PCA 310, PCA 320 and PCA 330
    HI 70491  Total Chlorine Reagent Kit
    HI 70480  Reagents set for PCA series
    HI 70490  Reagent kit for PCA
    HI 70452  DPD reagents for PCA series.

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