Reliable and Low Maintenance Measurement of Disinfectants

Tests were carried out following the DIN 15839, both under laboratory conditions and in a drinking water installation, over periods of up to half a year; the renowned German institute for water research, IWW in Mülheim, declare the results on linearity, accuracy, precision, and response times to be very good. Test reports are available on request.

The measuring systems of the company Dr. A. Kuntze (Germany) are available for measurement and control of free Chlorine, Chlorine dioxide, and Ozone; apart from the excellent performance, the systems offer many more advantages.

There is a simple installation; with a Krypton K you get all components you need for your measurement mounted on a board and fully wired. Installation is simple; select a representative measuring spot, connect water inlet and outlet, screw in the sensor, and turn on power and water. Within minutes the reading is stable and you can calibrate. This completes the set-up, the system does not need a 24h-period followed by recalibration, as with other measuring systems on the market.

The assembly is equipped with flow alarm, stop cocks at in- and outlet, and a sampling point. The sampling point enables you to take a sample directly at the measuring point. The flow alarm stops the controller in low water situations.

The amperometric method needs no chemicals and produces no waste water. The assembly is pressure-proof up to 6 bar, so the water can be rerouted into tanks or pipes.

The sensor used for the disinfectants measurement is constructed of glass and gold, therefore it is robust, easy to handle, and chemically and biologically inert. It has no membrane and needs no exchange of electrolyte. Unlike customary membrane sensors, the electrodes are in direct contact with the water, allowing quick response to concentration changes. A temperature sensor is included for automatic temperature compensation. Selectivity is obtained through the design of the input of the measuring instrument , this design determines whether free Chlorine, Chlorine dioxide or Ozone is measured.

All Krypton systems are delivered with the automatic cleaning ASR. This is an electrochemical cleaning that maintains the electrode surfaces clean and active by electrolysis of water. There is no need for chemical agents or physical components like sand or glass pearls that can get lost or cannot be used in in-pipe installations. Signal loss is prevented by ASR, leading to significantly lower maintenance demand.

The system provides two limit values, above or below these values an alarm is activated and given out via an alarm relay. Two control relays allow dosing of chemicals to maintain the desired disinfectant concentration. The relays can be configured separately, and bi-directional control is possible. Also, the analogue output can be used as controller output. Dosing time is monitored to detect damages in the feed lines and prevent uncontrolled release of hazardous chemicals in case of a defective dosing tube or tube connection. The controller can be stopped by an external switch via digital input, and is automatically stopped in case of failures, low water levels or other pre-determined parameters.