Thermo Scientific AquaSensors™ AquaClear ™ Low Range Turbidimeter User Guide 12Figure 3.2: The measure screen when the SensorHead is absent.4. MEASURE SCREEN OVERVIEWThe AV38 user interface is shown in Figure 3.1. It consists of an LCD module that contains two lines of 16alphanumeric characters and seven keys to navigate the menu. The contrast of the LCD module can beadjusted by simultaneously pressing the escape and up-arrow keys (for more contrast) or the escape anddown-arrow keys (for less contrast).When the DataStick and communications adapter are connected to the AV38 display but the optical sensorhead is absent, the measure screen indicates the fault as shown in Figure 3.2.Sensor HeadAbsentMENU ESC ENTER Lamp AssemblyThe lamp assembly screws intothe lid. The cable is routed to theuser terminal box.Lamp with cableChamber Lid0.035 NTU AB30.8 °C DS1: 6MENU ESC ENTER Figure 3.1: The elements of the measure screen