Component Repair and Calibration

Notice of Intent

The Centers for Disease Control and Prevention intends to award a sole source firm fixed price

purchase order to TSI Incorporated 500 Cardigan Road Shoreview, MN 55126 (CAGE Code:

24575) for the purchase of repair and calibration services for Government owned equipment.

Only the manufacturer (TSI Inc.) can repair and calibrate the Aerodynamic Particle Sizer because

proprietary models must be adjusted for the calibration, proprietary knowledge of internal flow

regulators is needed for the repair, and unique access to instrument components that are located

behind embedded electronics is required. Alternative service providers are not available because

proprietary information on the instrument operating model and flow regulation system is

required.

Description

TCI shall repair and calibrate 3 Aerodynamic Particle Sizers with an expected turnaround of 21

days. Upon receipt of instruments, TSI Inc. shall bring the 3 Aerodynamic Particle Sizers to a

calibration flow rate of 5 liters per minute (lpm) (1 lpm for sample + 4 lpm for sheath) and

maintain the calibration flow rate, even with a pressure drop of up to 50 inH20 at the inlet by

adjusting microprocessor controlled volumetric flow control, barometric pressure correction, and

separate pumps for sheath and total flows, to enable the Aerodynamic Particle Sizers to operate

under a wide range of conditions and still maintain calibration.

TSI Inc. shall also calibrate the 3 Aerodynamic Particle sizers for precise and accurate numbersize

distributions for 0.37 to 20 micrometers aerodynamic diameter using a time-of-flight

technique, and a patented, double-crest optical system to detect the occurrence of particle

coincidence (when more than one particle is in the detection area) and to identify poor signals

near the instrument’s lower detection threshold. The Government will provide the following

components for repair and calibration:

1. Aerodynamic Particle Sizer-S/N 1169

2. Aerodynamic Particle Sizer-S/N 1203

3. Aerodynamic Particle Sizer-S/N 72321006