Teledyne API Ultrafine Particle Monitor - Model 651 Maintenance, Service, and Troubleshooting
07506C DCN6727 85
Inspecting and Cleaning the Fans The fans should not require much maintenance, but it is beneficial
to perform a visual inspection at intervals to check for dust build
up. If any of the fans are dusty, blow them clean with
compressed air.
Clean/Replace the Orifices The Model 651 has three orifices:
Sample flow orifice (0.12 L/min)
Transport flow orifice (0.48 L/min)
Auxiliary flow orifice (3 L/min)
Auxiliary Flow
Orifice (Black)
Transport Flow
Orifice (Purple)
Manifold Block
Sample Flow
Orifice (Red)
Figure 9-9
Cleaning/Replacing Orifices
To clean or replace an orifice, follow these instructions:
1. Turn off the power to the Model 651.
2. Remove the instrument cover.