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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.

Note:  EPA Method 334 allows the use of any type of on-line Free or Total chlorine analyzer (e.g., amperometric, DPD, etc.) for compliance monitoring in drinking water when used in conjunction with a grab sample reference method that is approved for drinking water compliance monitoring. By following the outlined verification procedures in method 334, the CRA3500 can be used for compliance monitoring.  You can download Method  334 at the below link for more information:

Copy the following link to your browser...
http://www.epa.gov/safewater/methods/pdfs/methods/met334_0.pdf

 
BENEFITS

Automatic Calibration

Low Purchase Cost

Low Cost of Ownership

Reduced pH Dependency

SMS Text Alarms

Webserver*

pH Compensation Available

4-20mA and Relay Outputs

Carbon Dioxide or Acid Buffer
if Required

Can Operate for Three Months
without Operator Intervention
APPLICATIONS

WATER TREATMENT
Online disinfection monitoring
Disinfection dosage control

Swimming Pools


Paper Machine System Microbial Control


Legionella Control


Food Washing
DESCRIPTION OF OPERATION
The CRA3500 Residual Chlorine Analyzer measures free chlorine, total chlorine, and chlorine dioxide using a membraned-covered three electrode amperometric sensor. Chemtrac's probe design incorporates a long-lasting acidic fill solution which significantly reduces pH dependency. Because the CRA3500 has no moving parts and doesn't require buffers or the addition of reagents, cost of ownership is low maintenance is simple. The CRA3500 is available with up to two chlorine sensor inputs, reducing the cost per point.
Typical Probe Response to pH (Unbuffed)
ANALYZER SPECIFICATIONS
Power:
 110-240 VAC
Display:
 LCD Backlit 128x64 graphical
Outputs:
 Four configurable alarms (relays)
Two 4-20mA outputs
  PID Control (optional)
Inputs:
 Low flow alarm
Up to two sensors
Comms:
 USB
RS485 (Modbus)
TCP/IP (Modbus) (optional)
Datalogging:
 42 day at 15 min. intervals (user selectable)
Eventlogging
 500 events
AUTOCALIBRATOR
Power:
 110-240 VAC, 24 VDC (optional)
Outputs:
 Low flow alarm
GSM/GPRS Modem (optional)
Power:
 110-240 VAC, 24 VDC (optional)
SIM Card:
 User supply
Region:
 Quad band
 
CHLORINE SENSOR PROBE SPECIFICATIONS
Type:
Membrane covered amperometric three-electrode system
Measured:
 Free Residual Chlorine or Total Residual Chlorine
Range:

0.01-2, 0.01-5, 0.01-10 mg/L (ppm)
Resolution:
 0.01 mg/L (ppm)
Reproducibility:
 ±5%
Stability:
 -2% per month (without calibration)
Working electrode:
 Gold cathode
Counter electrode:
 Stainless steel anode
Reference electrode:
 Silver / silver halide
Flow Rate:
15 to 60 L/hr
Temperature range:
 >32° up to 113° F (>0° up to 45° C)
Temperature compensation:
 Automatically by an integrated thermistor (ATC)
pH - range:
 pH 4 - pH 9.5
Permissible overpressure:
 7.25 psi (0.5 bar)
First-polarization time:
 120 min.
Re-polarization time:
 30 min.
Zero-point adjustment:
 Not necessary
Calibration:
 Manual using DPD or Automatic (optional)
Housing material:
 PVC, silicone, polycarbonate stainless steel
Dimensions:
 Diameter approx. 0.98 in., length 6.89 in.
Maintenance intervals:
  
Membrane:
 Yearly
Electrolyte:
 Quarterly
Calibration reagent:
 Quarterly
Interferences:
 Surfactants and high levels of other oxidants such as Ozone and Chlorine Dioxide
 
Chemtrac Systems, Inc.- 6991 Peachtree Industrial Blvd.- Bldg. 600
Norcross, GA 30092
Phone: (770) 449-6233 (800) 442-8722 Fax: (770) 447-0889
chemtrac@chemtrac.com

Chemtrac Systems Incorporated
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