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CHLORINE RESIDUAL ANALYZER

Reagentless Chlorine Residual Analyzers including a Free Cl2 Analyzer, Total (Combined) Chlorine Analyzer, and Chlorine Dioxide Analyzer. It is now possible to use the CRA3500’s Membrane Covered Three-Electrode Free and Total Chlorine Sensors for compliance monitoring in drinking water (see below note for more details). Chemtrac’s Residual Chlorine Analyzer, in conjunction with a wide range of On-line Residual Chlorine Sensors, utilizes state of the art electronics that can include PID control, internal datalogging, local trending of recorded values on graphical display, Modbus TCP communications, Test Messaging of alarms, plus many other features.

The Residual Cl2 sensors that work with the CRA3500 Chlorine Meter do not require the use of external buffers or reagents which can present disposal issues. These membrane covered probes are unique in that they are internally buffered, which greatly improves their reliability and accuracy as compared to traditional amperometric chlorine analyzers. With maintenance intervals of just 3 to 6 months on the Free, Total (Combined), and Chlorine Dioxide Analyzers; these Bufferless and Reagentless Chlorine Meters are fast becoming the instrument of choice for the customer who wants the best chlorine sensor at the best price.

The CRA3500 Chlorine Residual Analyzer offers a wide array of communication & integration options including TCP/IP (LAN), RS485, USB, TTL, Relays, 4-20mA outputs, and GSM/GPRS modem. It is possible to interface and control the CRA3500 Chlorine Meter remotely, enabling data, alarms, and setup information directly from your computer. Despite all the additional functionality that this instrument has to offer, the purchase cost are less than, or comparable to, its competitors. Factor in that there is no requirement for reagents or buffers, and that there are no moving parts to replace or maintain, and the payback period to replace an existing residual Cl2 analyzer could be just a few months.

BENEFITS

Automatic Calibration
Low Purchase Cost
Low Cost of Ownership
Reduced pH Dependency
SMS Text Alarms
Webserver*
Bluetooth
4-20mA and Relay Outputs
Carbon Dioxide or Acid Buffer if Required
Can Operate for Three Months
without Operator Intervention

APPLICATIONS

WATER TREATMENT
Remote sites
Automatic Calibration
Chlorine Dosing Control
Secondary Chlorination

INLET/OUTLET MONITORING
Surface Water Inlet
Surface Water Outlet
Process Water Monitoring

DESCRIPTION OF OPERATION

The membraned polarographic probe, is enhanced with a third, reference, electrode which eliminates zero drift. pH correction is often not required at all. Where it is required there are options for using carbon dioxide or a more traditional acid buffer. A Total Residual Chlorine measurement probe option is also available.

The CRA 3500 offers a vast array of communication protocols including Bluetooth, TCP/IP (with webserver), USB, RS485, TTL, Relays and 4-20mA outputs. It is possible to interface and control the CRA 3500 remotely, enabling data, alarms and setup information to be sent directly to your computer, PDA or mobile phone.

ANALYZER SPECIFICATIONS
Power:	110-240 VAC
Display:	LCD Backlit 128x64 graphical
Outputs:	2 configurable alarms (relays)
	2 - 4-20mA outputs
Inputs:	1 low flow alarm
	1 low buffer alarm
Comms:	Bluetooth
	RS485
	TCP/IP (Webserver)
Datalogging:	One year at 15 min. intervals (equiv.)
Eventlogging	500 events
AUTOCALIBRATOR
Power:	110 VAC
Outputs:	Low flow alarm
	Low Co2 alarm (if fitted)
Co2 pH Suppressant Unit (If Required)
Co2 Usage:	Variable, zero waste
Acid Buffer Unit (If Required)
Power:	110 VAC
Dosing Pump:	Peristaltic

CHLORINE SENSOR PROBE SPECIFICATIONS
Type:	Membrane covered amperometric polarographic three-electrode system
Measured:	Free Residual Chlorine or Total Residual Chlorine
Range:	0-1, 0-2, 0-5, 0-10, 0-20mg/l (ppm)
Resolution:	0.01mg/l (ppm)
Reproducibility:	±5%
Stability:	-2% per month (without calibration)
Working electrode:	Cathode made of gold
Counter electrode:	Anode made of stainless steel
Reference electrode:	Silver / silver halide
Membrane material:	Micro-porous hydrophillic membrane
Flow Rate:	Approximately 0.5l/min.
Temperature range:	>0 up to 40 °C
Temperature compensation:	Automatically by an integrated thermistor
pH - range:	pH 4 up to pH 9,5
Permissible overpressure:	0.5 bar
First-polarization time:	120 min.
Re-polarization time:	30 min.
Zero-point adjustment:	Not necessary
Calibration:	Manual using DPD or Automatic
Housing material:	PVC, silicone, polycarbonate stainless
Dimensions:	Diameter approx. 25mm, length 175mm
Maintenance intervals:
Membrane:	Yearly
Electrolyte:	Quarterly
Calibration reagent:	Quarterly
Interferences:	High levels of other oxidants such as Ozone and Chlorine Dioxide