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PCA320-2 Chlorine, pH and Temperature Analyzer and Control

Producer: HANNA Instruments

SKU: HANNA-PCA320-2 Category: Hanna experimental measuring equipment

Chlorine, pH and Temperature Analyzer and Controller

– Continuously measure and control residual chlorine, total chlorine, pH and temperature

– Optional sampling time

- D4-20mA dosing output

– Data recording

– RS485 data extraction

– Supplied with full accessories and reagents

*pH electrode purchased separately

From drinking water and wastewater treatment to pool and spa sanitization, monitoring chlorine levels has a significant impact on public health as well as ROI and efficiency for heating systems and industrial applications. As one of the oldest and most common forms of disinfection, chlorine improves water quality by destroying pathogenic microorganisms and reacting with other organic and inorganic matter. Chlorine levels must be actively monitored to ensure that sufficient chlorine is available for disinfection, as well as to control adverse effects such as taste, odor, and potential reactions with organic matter to form harmful disinfection byproducts. Chlorine is a powerful oxidizer, destroying most organic and bacterial contaminants and can combine with nitrogen-containing compounds to form chloramines. When chlorine is dosed for disinfection, only a portion of the dosed chlorine remains active to actually continue the disinfection process.

CHLORINE MEASUREMENT BY DPD COLORIMATIC METHOD

The PCA analyzer uses the DPD colorimetric method in which the indicator N,N-Diethyl-p-phenylenediamine and a buffer solution are mixed with the sample. The resulting chemical reaction produces a bright red color in the presence of chlorine. The intensity of the color is proportional to the concentration. The color intensity is measured photometrically (a light source at a specific wavelength and a photodetector) and converted to a chlorine concentration, in mg/L, which is displayed on the front panel. The sampling interval for chlorine measurement is adjustable from 3 to 90 minutes. The PCA has a dosing relay to add chlorine using a dosing pump or chlorine generator when the reading falls below a programmable set point. The technology used by the PCA to measure chlorine is the same as that found in portable and benchtop colorimeters, providing consistent results when performing process verification with either type of meter.

To measure total chlorine (free chlorine and combined chlorine), potassium iodide is added. A pH of 5.1 is required for this reaction. Thus, total chlorine measurement requires another buffer solution containing potassium iodide. Once the reactions are complete, the optical signal at 555 nm is compared with the signal obtained after passing the sample before the reagent was added. Finally, the chlorine concentration is calculated and displayed on the screen.

Indicator and buffer reagents are supplied with the meter. With a 5 minute sampling time, reagents only need to be replenished about once a month.

The PCA 320 uses the HI1005 pH probe to continuously measure pH in the sample stream over a range of 0 to 14 pH. Sample temperature is measured over a range of 5 to 75°C. pH and temperature are displayed on the front panel, and the pH value is temperature compensated.

OUTSTANDING FEATURES

ALARM AND WARNING SYSTEM

Through this system, the user can enable or disable low and high alarms for all parameters. The system also provides over-dose protection and alerts when the system is not working properly. The system will stop the process until the error is corrected by the user. The time is displayed on the main control panel and the reminder times are for “old standard”, “expired reagent”, and “expired SIM”. All these alerts are generated based on user settings.

Measurement and control cycle

The PCA310 has a control time cycle that can be set by the user according to the size of the control system. Control, pumping and alarm processes can be performed based on this time cycle. The cycle can be set from 3 to 90 minutes.

Chlorine Control

Four user-adjustable chlorine level setpoints: one proportional dosing setpoint, two alarm setpoints and minimum pump level. The proportional dosing factor (1/Δ) is optional with Δ between 0.1 and 2 pH. The chlorine dosing system controls an SPST relay. Each alarm can be enabled or disabled.

Analog output

Two 4-20 mA or 0-20 mA outputs are available for connection to external devices such as chart recorders. The user can connect two dosing pumps via the 4-20 mA outputs for chlorine and acid/base dosing. The analog output is fully programmable and compatible with chlorine concentration. The analog output limits are selectable.

Record data

Up to 3500 values can be stored (at least 7 days of recording at 3 minute intervals), which can be reviewed or downloaded. The recorded data records include the time, full information about the parameter values and the alarm status at that time.

Installation

Easy control with wall mount kit and supplied with chemicals.

There are 3 PCA3X0 series options:

PCA310	Residual chlorine and total chlorine
PCA320	Residual Chlorine, Total Chlorine, pH and Temperature
PCA330	Residual Chlorine, Total Chlorine, pH, ORP and Temperature

SPECIFICATIONS

RESIDENTIAL CHLORINE AND TOTAL CHLORINE
The scale	0.00 to 5.00 mg/L Cl₂
Resolution	0.01 mg/L
Accuracy	±8% or ±0.05 mg/L, whichever is greater
Specific EMC deviation	0.05 mg/L
Chlorine calibration	1 point calibration
Minimum detection level	0.05 mg/L
Sample run time	Customize from 3 to 90 minutes
Pump	Dosing or 4-20mA output
Delta	Optional 0.1 to 5 mg/L(ppm)
pH
The scale	0.00 to 14.00 pH
Resolution	0.01pH
Accuracy	±0.05 pH
Calibration	1 or 2 points; or inline calibration
Dosing rate	Customize from 3 to 120 seconds
Pump	ON/OFF or proportional, relay or 4-20mA output
Delta	Optional 0.10 to 2.00pH
Delay	Optional 0.10 to 2.00pH
TEMPERATURE
The scale	5.0 to 75.0^oC
Resolution	0.1^oC
Accuracy	±0.5^oC
OTHER SPECIFICATIONS
Analog output (pump)	(1) 4-20mA
Recorded output	(1) 0-10 mV, 0-100 mV, 0-1 V, 4-20 mA
Connect computer	RS485, galvanically isolated
Baud rate	1200,2400,4800,9600 bps
Inlet sample pressure	0.07 to 4 bar, without external pressure regulator (for pressures exceeding 4 bar, an external pressure regulator is required)
GSM Alert	2 numbers, SMS alarm, SMS information, SMS warning
Sample flow rate	100 – 300 mL/min
Sample temperature	5 to 40⁰C
Record data	3500 data points
Electricity supply	230V, 50/60Hz; 20VA
Flow relay Warning relay System error	SPDT relays have contact states relative to a 5A resistive load at 230VAC
Sample input/output connection	12mm (1/2”) male NPT fitting
Drain connection	10mm (3/8”) barb
Bark	NEMA-4X standard, fiberglass molded polyester with clear Lexan window
Size	318 x 267 x 159 mm
Mass	5kg without reagent
Guarantee	12 months (for products with intact tags and warranty card)
Supply includes	– PCA320 measuring machine – Reagent includes 2 reagent bottles and 2 caps, 1 packet of DPD powder – Conduit - Warranty - User manual
Accessories purchased separately	– HI1005: pH electrode – HI70480: Free chlorine reagent – HI70481: Total chlorine reagent