4001 series The photometric method In recent decades, photometry has developed as an essential means of analysis because it enables the “quantitative” determination of both organic and inorganic compounds. The technique uses the colorimetric methods characteristic of certain analytes, i.e. the properties of certain chemical reagents to develop colour with an intensity proportional to the concentration of a given substance, at a particular wavelength of the spectrum visible between the UV and IR (from 400 to 800 nm). Compared to UV or IR spectrophotometry, the colorimetric technique has the tremendous advantage of relying on well-dened linear reactions with few well-known interfering substances. The Palin method employs the interactive DPD principle to determine the concentration of certain oxidants such as: free chlorine, total chlorine, chlorine dioxide, ozone, peracetic acid, bromine, permanganate etc. The DPD reacts with the oxidant present in the water, almost instantly producing a pink colour, making sure that all those factors that may affect measurement (pH, μS, °C, organic matter etc.) have no inuence on the analytical methodology. The phases of the 4001 measuring cycle are: • Entry of the sample in the measuring cell for washing/priming • First measurement on the sample as is ( photometric zero ) • Reagents introduced via peristaltic pump • Development of the reaction through stirring • Reading of the colour ( absorbance ): The differential measurement between the zero and the absorbance is processed by the electronic processor and converted into a concentration value, using specic correlation tables developed in our laboratories. The electronic controller displays the substance measured in mg/l and decides whether or not to activate the dosing components designed to control or correct it. The running and maintenance costs are very low and, especially, system calibration takes place automatically at each measuring cycle. Industrial applications include the analysis of drinking and waste water as well as the analysis of food products, pharmaceuticals, chemicals etc.

4Photometric measuring cell complete with RS485 serial interface card 4PVC/Plexiglas/glass body 4LED 4Silicon photosensor 4Electrode holder cup for storing pH, Rx electrodes and temperature/ow sensor 4Water supply 60 l/h 4Max pressure 1 bar 4Gravity drain for clean water 4Gravity drain for polluted water Versions available Cl2 Photometric free (or total) chlorine and temperature meter Free chlorine 00.00 to 05.00 ppm Cl2 (00.00 to 02.00 ppm on request) Resolution: 0.01 ppm Precision: 1% f.s. (colorimetric method with DPD) 4001-2 PPA Photometric peracetic acid and temperature meter Peracetic acid...

Technical specications Display LCD STN graphic 240x128 backlit display of: measurements (simultaneous measurement and temperature parameter + trend line), digital output status, storage status, faults, photometric measurement phase. Using keypad with 4 embossed keys Internal data logger 4 Mbit flash memory equal to 16000 records - Recording interval 00:00 to 99:99 min Type: circular / fill - Display: table / graph (1 for each parameter) Analogue outputs 1 for each parameter measured (excluding comb. chlorine) - Type: 0.00 / 4.00 to 20.00 mA Galvanically isolated - Programming limit: lower / upper...