Hach-Lange DR 3900 User Manual - Manual (Page 131)

131
Maintenance
4. Lift the cell receptacle upwards and out.
5. Emplace the new cell receptacle so that the pressure rollers
guide slot is to the left.
6. Using a cross-head screwdriver, tighten the two screws on
the floor of the cell compartment.
7. Connect the power cable to the instrument.