Thermo Scientific Omni FTIR Multi Gas CEMS Instruction Manual page 172

Preventive Maintenance and Servicing
Sample System Heater Assembly Components
5-88 Omni FTIR Multi Gas CEMS Instruction Manual
11. Using the 9/16-inch wrench and the 1/2-inch wrench, loosen the nut
and remove the tee fitting and check valve assembly from the old
solenoid valve. Install it on the new sample solenoid valve in the same
orientation, then tighten the nut until snug
12. Using the 9/16-inch wrench and the 1/2-inch wrench, loosen the nut
and remove the fitting and tubing assembly from the other side of the
old solenoid valve. Install it on the new sample solenoid valve in the
same orientation, then tighten the nut until snug
13. It is important to leak test the rebuilt assembly before installing it into
the heated block. On the right side of the system, disconnect the inlet
air line of the purge gas generator from the tee fitting and connect the 6
foot piece of PTFE or PFA tubing to the tee, to create a long air line.
Attach the 1/4-inch Swagelok union fitting to it and connect that to
the Sample In line. Turn the air regulator that is next to the filters up
to 25 PSI. (If air flows out of the check valve, it is installed backwards.)
Using the liquid leak detector, wet every connection on the check valve
side of the solenoid valve to see if there are any leaks, which will
produce air bubbles. If any are present, tighten the fitting until the
leaking stops. Turn the air regulator back down to zero PSI.
14. Use the wrenches to install the 1/4" Swagelok plug onto the fitting on
the bent piece of tubing on the other side of the solenoid valve.
Disconnect the air line with union from the Sample In line, remove the
union fitting, and connect the air line to the FTIR In fitting. Turn the
air regulator up to 25 PSI. Using the liquid leak detector, wet every
connection on that side of the solenoid valve to see if there are any
leaks, which will produce air bubbles. If any are present, tighten the
fitting until the leaking stops. Turn the air regulator back down to zero
PSI. Using the wrenches, remove the air line from the FTIR In fitting
and remove the 1/4" Swagelok plug from the fitting on the bent piece
of tubing near the solenoid valve. The remainder of the leak test will be
done after the solenoid valve and plumbing assembly are re-installed in
the heated block.
15. Attach the copper tubing with brass nut to the check valve, but do not
tighten it all the way. Rotate the valve assembly until it lies in its
original position in the heated block
16. Attach the other piece of copper tubing with brass nut to the union
fitting on the adjacent side, but do not tighten it all the way
61).
(Figure 5–61).
(Figure 5–61).
(Figure 5–61).
Thermo Fisher Scientific
(Figure 5–