Closing the source isolation valve

To close the source isolation valve before starting a maintenance procedure:

Warning: To avoid personal contamination with biologically hazardous, toxic, and corrosive materials, wear chemical-resistant, powder-free gloves when performing this procedure.

1. Prepare the instrument for working on the source (see Preparing the instrument for working on the source).

 Warning: To avoid burn injuries, take great care while working with the source enclosure open.
 Warning: To avoid puncture wounds, take great care while working with the source enclosure open if one or both of these conditions apply:

• An ESI probe is fitted (the probe’s tip is sharp).
• A corona pin is fitted (the pin’s tip is sharp).

2. Pull the source enclosure release (located at the bottom, right-hand side) outward and swing open the enclosure.
3. Close the source isolation valve by turning its handle counterclockwise to the vertical position.