The measuring and switching device for top hat rail mounting measures and regulates, depending on the configuration, the pH or redox voltage in aqueous solutions. The transmitter has two analog inputs. The first analog input (main input for pH value or Redox voltage) is for the connection of one-dial measuring chains, or Electrodes with separate reference electrode. The device is also prepared for connection of antimony electrodes. A resistance thermometer Pt100 or Pt1000 can be connected. Two analogue outputs and one relay change-over contact are available. The relay contact can be assigned either the main value (pH value or redox voltage) or the temperature. The devices are operated and configured via keys and the integrated LC display. Alternatively, you can do this very conveniently via the setup connection (notebook / PC) with the provided setup program. The setup program can also be used to print out the configuration data. This facilitates the system documentation. The devices are delivered with a calibration certificate in which the device and comparison data are documented. Power is supplied via a 20..30 V DC power adapterThis text is machine translated.