TSI Instruments Aerotrak 9303 - CHAPTER 3 Operation

General Maintenance–Model 9303 2-7
10. Attach tie wrap for filter. Leave enough space for filter.
11. Insert filter through tie wrap, tighten tie wrap and cut excess tie wrap.
12. Insert Inlet Nozzle through case opening.
13. Route pump filter tube under detector board and over the inlet nozzle.
14. Verify tube is not pinched.