173.8.1 Configuring Settings in the Technician MenuNavigation within in the Technician Menu is identical to the operator menu.1) To enter the Technician menu, press Menu to enter the operator menu and then the up arrow anddown arrow together simultaneously until the menu display changes.2) Locate the desired parameter in the menu:a) Press Menu until the desired parameter name appears in the LCD display.b) Press OK. Enter Password 100 appears in the LCD display.3) Enter the Technician menu password:a) Press the up arrow or down arrow until the password number is reached.b) Press OK. The parameter name and current setting appear in the LCD display.Note: Technician menu password is different from the Operator menu password. The defaultTechnician menu password is 456 and if lost, can only be reset by replacing the chipset.4) Continue changing the parameter setting, as described in the Operator menu.3.9 Calibration and Initial Operation ChecklistBefore leaving the site, perform the procedure in this section and record the requested values.Calibrate the following WaterGuard parameters and enter the information into the table below. If pH isreading slightly low, do not calibrate as it will continue to increase for the first 24-48 hours.4 Routine Operation and MaintenanceOnce installed by a qualified technician, WaterGuard can begin monitoring and controlling water quality.WaterGuard is specifically designed for easy operation; however some periodic maintenance is stillrequired.• Basic Operation: involves setting the desired parameters and monitoring the system for alarms.When operating normally, WaterGuard demands very little operator involvement.• Calibration: Sensor sensitivity and accuracy can degrade or drift over time. For this reason,WaterGuard settings must be periodically recalibrated and compared with measurements fromother measuring devices, such as electronic photometers, pH sensors, and thermometers orcompared to standard solutions like pH buffers.