Galvanic Applied Sciences 943-TGXeNA, Operation Manual

Page: 116 / 149

Revision 5 116 August 2021
The oven enclosure and all of its components are HOT ( 150°C ). Wear
appropriate personal protective equipment (gloves, eye wear, clothing etc)
if working with hot surfaces or wait until surface have cooled to safe
temperatures before performing maintenance tasks.
6. Allow zero gas to flow for approximately five (5) minutes to remove all toxic gases from
the sample system.
7. Ensure all five block valves in the oven enclosure are in the closed position. Fully close
the Zero Air Flow Adjust valve.
8. Remove the Fibre Optic Cables from both ends of the measurement cell. Carefully
hang the cables in a location where the ends of the cables cannot not contact anything.
Cap the ends of the two fibres with the orange protective caps.
9. Loosen one of the cell tubing fittings to vent positive pressure zero gas that may be
trapped in the sample system.
10. To remove the measurement cell block, tubing connected to the measurement cell
block assembly must first be removed. Disconnect the fittings circled in Figure 76.
Figure 76: Oven Enclosure
11. Using a 7/64” ball driver, remove the 6-32 x 3/8” screw securing the cell RTD to the
cell block Carefully place the cell RTD behind the cell block where it will be out of the
way. Place the screw in the storage box in the control cabinet to prevent it from getting
lost.
12. Loosen the four ¼-20 x 2” heater bracket mounting screws from the cell block face
using a 3/16” ball driver. Before removing the last screw entirely, place your fingers
Process gas is still present at
the probe side of these
valves. To prevent the
release of toxic gases, ONLY
disconnect tubing from the
cell side of these valves, NOT
the probe side.