Bronkhorst CEM W-300B - Manual (Page 20)

BRONKHORST HIGH-TECH B.V.
B) To start the process:
Procedure: Actions:
B1)Set the CEM heater at right temperature. Give setpoint to the heater, wait until
temperature is reached.
B2) Start gas flow. (1) Open 9. Give setpoint to gas MFC.
B3) Start liquid flow. (2) Give setpoint to liquid flow controller, wait
until stabilization.
B4) Connect process. Open 10, close 11.
C) To stop the process:
Procedure: Actions:
C1) Disconnect process. Open 11, close 10.
C2) Stop liquid flow. Give setpoint = 0 to liquid flow controller.
C3) Optional: Stop gas flow. (1) Give setpoint = 0 to gas MFC.
D) How to leave system overnight:
Procedure: Actions:
D1) Relief the supply pressure from the liquid
supply and lines.
Close 2, close 5 and open 1 for some
seconds.
Relief pressure inert gas supply, open 2.
D2) Leave system unused. Close 3. Preferably, keep pumping the lines,
close 2, open 1.
D3) Before startup, pressurize liquid supply. Close 1 and open 2.
Open 3 and 5.
D4) System is now ready for use. Proceed according to B.
E) To empty and purge the system: (3,4)
Procedure: Actions:
E1) Follow procedure “How to leave system
overnight” until “leave system unused”.
See D1 and D2.
E2) Purge liquid out of lines. Open 4 and 7.
E3) Purge lines with inert gas. Close 1.
Open 2 briefly for some time.
E4) Evacuate liquid lines (cont.). Close 2, open 1.
E5) Optional: Repeat last two steps for a few
times.
1
Make sure that the carrier gas is always flowing when the liquid flow is on. Preferably,
let always gas flow in the carrier gas line when the system is filled with liquid.
2 Close supply pressure of the liquid vessel during the process. The pressure controller of
the inert gassupply can influence the stability of the liquid flow controller.
3 If the liquid is reactive or aggressive, be sure to remove air (and water vapor) carefully, before
introducing liquid in the system.
4 If the liquid is reactive, aggressive, poisonous, toxic, or flammable, beware that the system is
purged fully (preferably with inert liquid, E3, E4, E5) before opening the system.
Remarks:
- In case of non-pure liquids, place a filter just before the Liqui-Flow.
- Mount the CEM system vertical.
App. 1, page 4