# SAM #75301-26-Q-79276

CDC seeks sole source repair and calibration services for Aerodynamic Particle Sizers from TSI Incorporated

**Buyer:** CDC Office of Acquisition Services
**Posted:** September 17, 2026
**Respond By:** September 21, 2026
**Identifier:** 75301-26-Q-79276
**NAICS:** 811210, 811219

The Centers for Disease Control and Prevention (CDC), specifically the NIOSH PMRD/HHPB office, is seeking specialized repair and calibration services for three Aerodynamic Particle Sizers.
- Government Buyer:
  - CDC (Centers for Disease Control and Prevention)
  - NIOSH (National Institute for Occupational Safety and Health)
  - PMRD/HHPB office
- OEM and Vendor:
  - TSI Incorporated (sole source manufacturer and service provider)
- Services Requested:
  - Repair and calibration of three Aerodynamic Particle Sizers (serial numbers: 1169, 1203, 72321006)
  - Calibration to a flow rate of 5 liters per minute
  - Adjustment for pressure drops using microprocessor-controlled volumetric flow control and separate pumps
  - Calibration for precise and accurate number-size distributions (0.37 to 20 micrometers) using time-of-flight technique and patented optical system
- Unique Requirements:
  - Only TSI Incorporated can perform these services due to proprietary technology and access to internal flow regulators
  - Strict performance standards and inspection criteria
  - 21-day turnaround time after receipt of instruments
  - No alternative service providers due to proprietary information
- No product line items; all requested items are services for existing government-owned equipment.

### Description

<p>Notice of Intent<br />
The Centers for Disease Control and Prevention intends to award a sole source firm fixed price<br />
purchase order to TSI Incorporated 500 Cardigan Road Shoreview, MN 55126 (CAGE Code:<br />
24575) for the purchase of repair and calibration services for Government owned equipment.<br />
Only the manufacturer (TSI Inc.) can repair and calibrate the Aerodynamic Particle Sizer because<br />
proprietary models must be adjusted for the calibration, proprietary knowledge of internal flow<br />
regulators is needed for the repair, and unique access to instrument components that are located<br />
behind embedded electronics is required. Alternative service providers are not available because<br />
proprietary information on the instrument operating model and flow regulation system is<br />
required.<br />
Description<br />
TCI shall repair and calibrate 3 Aerodynamic Particle Sizers with an expected turnaround of 21<br />
days. Upon receipt of instruments, TSI Inc. shall bring the 3 Aerodynamic Particle Sizers to a<br />
calibration flow rate of 5 liters per minute (lpm) (1 lpm for sample + 4 lpm for sheath) and<br />
maintain the calibration flow rate, even with a pressure drop of up to 50 inH20 at the inlet by<br />
adjusting microprocessor controlled volumetric flow control, barometric pressure correction, and<br />
separate pumps for sheath and total flows, to enable the Aerodynamic Particle Sizers to operate<br />
under a wide range of conditions and still maintain calibration.<br />
TSI Inc. shall also calibrate the 3 Aerodynamic Particle sizers for precise and accurate numbersize<br />
distributions for 0.37 to 20 micrometers aerodynamic diameter using a time-of-flight<br />
technique, and a patented, double-crest optical system to detect the occurrence of particle<br />
coincidence (when more than one particle is in the detection area) and to identify poor signals<br />
near the instrument&rsquo;s lower detection threshold. The Government will provide the following<br />
components for repair and calibration:</p>

<p>1.&nbsp;&nbsp;Aerodynamic Particle Sizer-S/N 1169</p>

<p>2.&nbsp;Aerodynamic Particle Sizer-S/N 1203</p>

<p>3.&nbsp;&nbsp;Aerodynamic Particle Sizer-S/N 72321006</p>

[View original listing](https://sam.gov/opp/9eb57fd9e4e34da6bccc5f72bd6c556e/view)