20Chapter 4:SettingsSettings Menus OverviewThe P51-870 TITAN™ settings menus are separated into four menus: unit settings, refrigerantsettings, device settings, and general settings. While on any modes screen or the modes menu,the general settings menu can be quickly accessed by tapping the gear icon in the top right corner.Unit and refrigerant settings can also be accessed by tapping the buttons in the bottom left andright-hand corners of each modes screen.General Settings MenuThe general settings menu, shown in Figure 30, allowsthe user to adjust system refrigerant, enter the units anddevice settings menus, zero the pressure transducers,and calibrate the touchscreen display. To access eitherthe units or device settings menus, tap on theappropriate button. The exit button in the bottom leftcorner can be used to return to the previous screen atany time.Zeroing the Pressure Transducers:To ensure accurate pressure readings, the pressure transducers should be re-zeroed before everyjob. To correctly zero the pressure transducers, first remove any pressure from the manifold andensure all knobs are open such that the manifold is at current atmospheric pressure. Next,navigate to the general settings menu and tap the “Zero Transducers” button.If the zeroing was successful, the button will flash green. If the zeroing was unsuccessful thebutton will flash red. A common issue when zeroing transducers is residual positive pressurewithin the manifold. The P51-870 TITAN™ will not zero transducers if the manifold containspressure exceeding 30 psia.Figure 28: Pressure Rise Test - FAIL Figure 29: Pressure Rise Test - PASSFigure 30: General Settings Menu