Shutdown - Universal Analyzers 270SF Instruction Manual

8.0

Shutdown

Before removing power from the unit, ensure filter chamber has been purged of any potentially hazardous
components.
To purge the chamber, perform the following:
1. If equipped, perform a manual blowback operation.
2. Close the filter stack isolation valve(s).
3. Ensure no sample is being drawn though the filter chamber. If the sample is being drawn using a sample
pump, turn off the power to the pump or disconnect the sample line.
4. If not already done, disconnect the sample line.
5. Use instrument air or other inert gas, flow ~10 l/m for 15-30 minutes through the filter chamber.
Note: Inert gas can be routed through the chamber via the calibration gas line.
6. After purging is complete, follow the maintenance procedure to change the filter.
7. Cap the sample outlet tube connection and disconnect power from the unit.
Note: If electrical wires are to be disconnected, follow applicable 'Lock Out/ Tag Out' requirements.
MAN.270SF.REVB.102018 Page 11 of 18