April 2009Analytical Instrumentation & Environmental Monitoring
ISEmax ion-selective measuring system.
Endress+Hauser’s new ISEmax CAS40 system for measuring ammonium and nitrate is based on potentiometric measurement with ion-selective electrodes.
Potentiometric measurement uses ion-selective electrodes similar to pH measurement. As a result of charged ions migrating, a potential difference occurs between the measuring electrode and the reference electrode. This difference in potential is measured and is proportional to the ion concentration. It makes the processes of nitrification and de-nitrification transparent particularly in the area of wastewater treatment.
The sensor consists of ion-selective electrodes and a reference electrode
ISEmax measures the concentration of ammonium and nitrate quickly and continuously in municipal wastewater treatment plants. The robust in-situ measurement allows measuring several parameters simultaneously with one sensor. A distinguishing feature of ISEmax is its short response time. Since ISEmax is immersed directly into the measuring solution, the measuring system responds very quickly to changes in the concentration. The rapid trend display supports the early control and regulation of the processes.
Typical applications in municipal wastewater treatment plants include measuring the concentration of ammonium and nitrate directly during sludge activation, measuring the ammonium (pH-compensated) load in the inlet to sludge activation, and load-dependent aeration control.
The compact measuring system contains a sensor and a transmitter. The sensor consists of ion-selective electrodes, a reference electrode, potential matching, a temperature sensor as well as automatic compressed-air cleaning nozzle and a pre-amplifier. The sensor is mounted directly on the basin rim with a suitable retaining unit and is immersed directly into the process with the electrodes. Up to three ion-selective electrodes simultaneously measure ammonium, nitrate and with potassium or chloride compensation, if required by the customer.
The ISEmax membrane caps which are selective for the ions to be measured are easily replaceable. A membrane kit with easy-to-use replacement caps is also available as an accessory. The membranes are robust and can be used for up to six months. Due to the integrated compressed-air cleaning system, they are kept free from fouling and contamination and are thus always operational.
ISEmax encompasses a large measuring range:
* Ammonium-nitrogen: 0,1-1000 mg/l NH4-N.
* Nitrate-nitrogen: 0,1-1000 mg/l NO3-N.
The unit is easy to use: the measuring system does not use any chemicals, is low-maintenance and does not require external sampling. Furthermore, integrated automatic compressed-air cleaning prevents the membranes from fouling. Thus reducing the costs for power used in the aeration systems.
This new technology extends Endress+Hauser’s liquid analysis portfolio. It strengthens the company’s position as a complete provider and offers potential for other parameters and industries.
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