3.4.2 Tubing installation
Use hooks or cable ties to hold the tubing and prevent a bend in the tubing. A bend in the tubing can restrict the air flow and cause the following problems:
• A restriction on the sampling side can cause particles to collect on the inside of the tubing. The particles will not be counted. The collected particles can release at random, which will cause spikes in the count level.
• A restriction on the vacuum side will cause the vacuum to fall below specified levels. The low vacuum can cause a flow alarm and low particle count