UV sensors of the model series SUV 13 are duty sensors and intended for the use direct in water. The sensors have a G ¼” screw-in thread and are available in different types. Configuration options are the type of the output signal, the measuring range and the total length. Also, a pollution insensitive direct vitrification of the entrance optic to avoid sealing elements which are vulnerable to aging is optionally possible. The output signal is either a voltage output with 0 to 4,5/10 V, a current loop output with 4 to 20 mA or a RS485 interface. Therefore, the sensors will be calibrated absolutely according to the customer’s specifications and delivered with a manufacturer certification optionally. Relative measuring types without calibrated output signal are also available. In addition, digital sensor versions for calibration provided by customer by the use of the reference radiometer KUV 2.4 WR are available. Also, the working range as well as the sensor type and the serial number will get marked permanently on the surface of the sensor so that a steady identification and retracability will be guaranteed. If they are plugged in the sensors reach the degree of protection IP65. Suitable connection cables as accessories are also available.