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美國ChemTracCRA3500氯殘留分析儀
| 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 remoy, 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 remoy, enabling data, alarms and setup information to be sent directly to your computer, PDA or 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: | Approximay 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 |
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