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PCA340-2 Chlorine, pH and Temperature Analyzer and Control

Producer: HANNA Instruments

SKU: HANNA-PCA340-2 Category: Hanna experimental measuring equipment

PCA340 analyzes and controls chlorine concentration, pH and temperature continuously in the stream and adjustable chlorine dosing, optional sampling time, alarm system, data connection via GSM network, easy to use interface, RS485 communication, recording output, 4-20mA dosing output, NEMA 4X housing.

From drinking water and wastewater treatment to pool and spa sanitation, controlling chlorine, bromine or iodine levels is important for public health as well as ROI and beneficial for heating systems and industrial applications.

The PCA340 series controls residual chlorine or total chlorine from 0.00 to 5.00 mg/L and pH from 0.00 to 14.00

In the DPD colorimetric method, the indicator N, N-Diethyl-p-phenylene-diamine and a buffer are mixed with the sample. The residual chlorine oxidizes the DPD indicator reagent at pH 5.5 and 6.0 to form a red compound. The intensity of the color is proportional to the concentration of chlorine in the sample. The purpose of the buffer solution is to maintain the appropriate pH.

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.

Since chlorine, bromine and iodine are closely related to pH, HANNA has designed the new PCA 320 analyzer to control pH and temperature.

The PCA 340 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.

Measurement and control cycle

PCA has a control time cycle that can be set by the user depending on 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.

pH control

3 pH concentration set points can be set: one control set point and two alarm set points. The pH control modes are user selectable; on/off or proportional dosing. The proportional dosing factor (1/Δ) is optional with Δ between 0.1 and 2 pH. The hysteresis value must be between 0.05 and 2.00 pH. The pH dosing system controls an SPST relay.

The pH and temperature alarms can be enabled or disabled, and two alarm levels can be set by the user for temperature. The alarm condition controls an SPDT relay. The fault alarm system activates a signal relay when process intervention is required. The fault alarm system controls an SPST relay.

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 outputs are fully programmable and compatible with chlorine concentration, pH or temperature values. The analog output limits are selectable for each parameter.

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.

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.

Installation

Easy control with wall mount kit and supplied with chemicals.

(Note: Not for Bromine and Iodine)

Target options:

PCA310	Residual chlorine and total chlorine
PCA320	Residual Chlorine, Total Chlorine, pH and Temperature
PCA330	Residual Chlorine, Total Chlorine, pH, ORP and Temperature
PCA340	Residual Chlorine, Total Chlorine, pH and Temperature

SPECIFICATIONS

Chlorine	The scale	0.00 to 5.00 mg/L (ppm)
	Resolution	0.01 mg/L (ppm)
	Accuracy	± 8% or ±0.05 mg/L whichever is greater
	EMC deviation	±0.05 mg/L (ppm)
	Calibration	1 point
	Sampling time	3 to 90 minutes
	Dosage division	Proportional relay or 4-20mA output
	Delta	Optional from 0.1 to 5 mg/L (ppm)
pH	The scale	0.00 to 14.00 pH
	Resolution	0.01 pH
	Accuracy	± 0.05 pH
	EMC deviation	± 0.2 pH
	Calibration	1; 2 point or in-line calibration
	Sampling time	3 to 120 minutes
	Dosage division	On/off or proportional, relay or 4-20mA output
	Delta	Optional from 0.1 to 2 pH
	Delay	Optional from 0.05 to 2 pH
Temperature	The scale	5.0 to 75.0^oC
	Resolution	0.1^oC
	Accuracy	± 0.05^oC
	EMC deviation	± 0.5^oC
Exit	4-20mA, 0-20mA
PC connection	RS485, galvanic seperated
Baud rate	1200, 2400, 4800, 9600 bps
Record data	Up to 3500 records
Alarm relay	SPDT 5A, 230V
Pump relay	SPDT 5A, 230V
Report an error	SPDT 5A, 230V
Pressure rate input	0.07 to 4 bar without external pressure regulator (for pressures exceeding 4 bar an external pressure regulator is required)
Flow rate	100 to 300 mL/min
Sample temperature	5 to 40°C (41 to 104°F)
Input/Output	12mm (1/2″) male NPT fitting
Connect drain	10mm (3/8″) barb
pH/t electrode^o	HI1005 (sold separately)
Electricity supply	20 VA
Bark	NEMA-4X
Size	318 x 267 x 159 mm
Mass	5 kg without reagent
Guarantee	12 months
Supply includes	PCA340 is supplied with 2 reagent bottles, 2 reagent caps, 1 DPD powder packet, tubing and instructions.
Note	PCA340-1: 115V PCA340-2: 230V