Hach ORBISPHERE A1100 User Manual

23Installation4.2.2 Sensor insertionNote: Check that the small O-ring at the bottom of the flow chamber is present during removal andinstallation of the sensor, as it may stick to the sensor head and fall.• Insert the sensor straight into the flow chamber or socket.• Hand tighten the attaching collar.• Connect the sensor cable.• Check for leaks; replace O-rings if product leaks are visible.Micro Volume Flow Chambers:Note: Do not twist the sensor when inserting it into a micro volume flow chamber. This rotation may twist themembrane holding ring, thus changing the membrane position. This can modify the membrane measuringconditions, and affect measurement precision.4.2.3 Sensor removal• Shut off the sample flow and drain the sampling circuit of liquid or gas.• Remove the sensor cable connected at the sensor end.• Hold the sensor body in one hand to avoid rotation and unscrew the collar with the otherhand.• Pull the sensor straight out of the socket or flow chamber.• Check that both O-rings remain in place inside the flow chambers.• Install sensor storage cap and sensor base (to protect the connection).Figure 7 Sensor insertion