A5-Statement of Work.pdf
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- Component Repair and Calibration
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- 75301-26-Q-79276
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This is a Statement of Work/Performance Work Statement for repair and calibration services of aerodynamic particle sizers to be performed by TSI Inc.
The contract covers repair and calibration of three Aerodynamic Particle Sizers (serial numbers 1169, 1203, and 72321006) for the CDC/NIOSH Nanotechnology Research Center (PMRD). The period of performance runs from September 30, 2026 through November 30, 2026, with an expected 21-day turnaround once TSI receives the instruments. Task 1 requires TSI to repair the three instruments by bringing them to a calibration flow rate of 5 liters per minute (1 lpm sample flow and 4 lpm sheath flow) and maintaining this rate even with pressure drops up to 50 inH20 at the inlet through microprocessor-controlled volumetric flow control and barometric pressure correction. Task 2 requires calibration for precise and accurate number-size distributions across the 0.37 to 20 micrometer aerodynamic diameter range using time-of-flight techniques and a patented double-crest optical system for particle coincidence detection. Performance standards require a 2% deviation maximum from the standard flow rate (100% inspection) and 95% of samples within ±25% deviation from standard for calibration accuracy (100% inspection). The contractor must possess the capability to calibrate Aerodynamic Particle Sizers using proprietary information. Performance of work will occur entirely at TSI's facility in Shoreview, Minnesota, with delivery of repaired and calibrated instruments to Teresa Barone at CDC/NIOSH/PMRD/HHPB by September 30, 2026.
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Statement of Work / Performance Work Statement
Title: Repair and Calibration of Aerodynamic Particle Sizers
Period of performance of this contract is: September 30, 2026- November 30, 2026
SECTION 1 – BACKGROUND
The instrument will be used in combination with aerosol chambers in projects associated with respirable dust, such as Advancing Sampling and Sensing Approaches for a Continuous Respirable Crystalline Silica
Monitor and Analytical Enhancement of Rapid Quartz Analysis. It is a real-time instrument that is capable of aerosol size measurements over a range of 0.5 to 20 micrometers with high precision. The instrument enables the real-time monitoring of the mass-based particle size distribution of an aerosol using a metric
(aerodynamic diameter) that is relevant to occupational health recommendations and regulations. The aerosol size distribution based on aerodynamic diameter is an important reference measurement in many studies in aerosol chambers at NIOSH.
SUBSECTION A – DEFINITIONS
Respirable – size fraction of airborne particles that penetrates to the unciliated region of the respiratory tract
(i.e. penetrates to lungs)
SECTION 2 – PURPOSE/OBJECTIVE
The primary objectives are the (1) repair and (2) calibration of three Aerodynamic Particle Sizers by the manufacturer TSI Inc.
SECTION 3 – SCOPE OF WORK
(1) TSI Inc. shall bring the 3 Aerodynamic Particle Sizers to the calibration flow rate and maintain the calibration flow rate even with a pressure drop at the inlet.
(2) TSI Inc. shall calibrate the 3 Aerodynamic Particle Sizers for precise and accurate number-size distributions.
The expected turnaround time is 21 days for the repair and calibrations once TSI receives the instruments.
SECTION 4 – TASKS TO BE PERFORMED
Task 1: Repair of 3 Aerodynamic Particle Sizers
TSI Inc. shall bring the 3 Aerodynamic Particle Sizers to the 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.
Task 2: Calibration of 3 Aerodynamic Particle Sizers
TSI Inc. shall calibrate the 3 Aerodynamic Particle sizers for precise and accurate number-size 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.
SECTION 5 – GOVERNMENT FURNISHED PROPERTY
Aerodynamic Particle Sizer Serial Number 1169
Aerodynamic Particle Sizer Serial Number 1203
Aerodynamic Particle Sizer Serial Number 72321006
SECTION 6 – PLACE OF PERFORMANCE AND CONTRACT SUPPORT HOURS
SUBSECTION A – PLACE OF PERFORMANCE
Entirely off site at contractor’s facility: TSI Incorporated, 500 Cardigan Road, Shoreview, MN 55126, USA
SUBSECTION B – CONTRACT SUPPORT HOURS
N/A
SECTION 7 – TRAVEL
SECTION 8 – DELIVERABLES/REPORTING SCHEDULE
PMRD expects delivery 21 days after TSI receives the instruments.
Task Deliverable Quantity/Format Due Date Deliver To
Repair &
Calibration
Aerodynamic
Particle
Sizers
Return Instruments to
PMRD
09/30/2026 Teresa Barone, (CDC/NIOSH/PMRD/HHPB)
PERFORMANCE
OBJECTIVE
STANDARD PERFORMANCE
THRESHOLD
ACCEPTABLE
QUALITY LEVELS
(AQLs)
METHOD OF
SURVEILLANCE
PRS#X – Service Contract
TSI Inc. shall bring 3
Aerodynamic Particle Sizers to the calibration flow rate of
5 liters per minute
The sample flow rate should be 1 liter per minute and the sheath flow rate 4 liters per minute
2% Deviation from standard
100% Inspection
PRS #X - Service Contract
TSI Inc. shall calibrate 3
Aerodynamic Particle sizers for precise and accurate number-size distributions for
0.37 to 20 micrometers aerodynamic diameter
The number-size distributions of the 3
Aerodynamic Particle
Sizers should agree
95% of samples should be within +/- 25%
Deviation from standard
100% Inspection
SECTION 9 – REFERENCE MATERIALS
SECTION 10 – MINIMUM VENDOR QUALIFICATIONS
Capability of calibrating Aerodynamic Particle Sizers using proprietary information.
SECTION 11 – ADDITIONAL REQUIREMENTS
Information Security and Privacy
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Paperwork Reduction Act (PRA)
Printing
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