We've detected you are coming from a location inside the Americas.

Please choose one of the following:

Global sites: BSRIA Inc BSRIA SARL BSRIA Business Consulting (Beijing) Co., Ltd.
Phone+44 (0) 1344 459314 Contact Instrument Solutions

TSI 9350 & 9550

Available for hire

Hover to zoom

The TSI AEROTRAK™ portable particle counters models 9350 and 9550 offer best-in-class features and versatility. Both models provide a 50 l/min flow with either 0.3 or 0.5 μm sensitivity. Perform ISO 14644-1 classifications and complete certifications of EU GMP facilities, by sampling 1 m3 of air in just 20 minutes. Compatible with TSI’s accurate ventilation probes that measure air velocity/temperature, these products provide you with a complete solution for your certification needs. Also an operating temperature range of 2 oC to 35 oC makes the unit ideal for use in pharmaceutical cold storage applications.

Product Features

  • 2 model types
  • Range of accessories
  • Document downloads
  • Instrument FAQs

Instrument product options

1. Select a model (2 available)

Continue to select accessories

2. Select accessories

3. Select a calibration

4. Request a quote



These particle counters can generate pass/fail reports for ISO 14644-1, EU GMP Annex 1, and FS209E. These product can be used as a stand-alone particle counter. Both models comply with all the stringent requirements set forth in ISO 21501-4. They are calibrated with NIST traceable PSL spheres using TSI’s world-class Classifier and Condensation Particle Counters, the recognized standard for particle measurements.

Instrument is compatible for use with TrakPro Lite Secure software as an optional extra which enables data transfer in a 21 CFR Part 11 compliant manner.


  • 9350 particle counter: 0.3 to 25 μm
  • 9550 particle counter: 0.5 to 25 μm
  • Up to six channels of simultaneous data
  • 50 l/min flow rate
  • Complies with all requirements of ISO 21501-4
  • 10,000 sample record storage, 999 locations
  • Ethernet and USB outputs
  • Industry’s loudest audible alarm
  • Easy icon-driven touch screen operation
  • Reports for ISO-14644-1, EU GMP Annex 1, and FS209E
  • Allows storage and recall of specific tests/recipes
  • Displays up to three environmental parameters
  • Stainless steel enclosure
  • Lightweight
  • Clean room classification down to ISO Class 2


Particle channel sizes

9350: 0.3, 0.5, 1.0, 2.0 3.0, 5.0 μm, with additional channel sizes available

9550: 0.5, 0.7, 1.0, 3.0, 5.0, 10.0 μm, with additional channel sizes available

Size Resolution

< 15 % @ 0.5 μm (per ISO 21501-4)

Counting efficiency

9350: 50 % at 0.3 μm; 100 % for particles > 0.45 μm (per ISO 21501-4 and JIS)

9550: 50 % at 0.5 μm; 100 % for particles > 0.75 μm (per ISO 21501-4 and JIS)

Concentration limit

> 710,000 / ft3 at 10 % coincidence loss

Light source

Long life laser diode

Zero count

< 1 count per 5 minutes (per ISO 21501-4 and JIS B9921)

Flow rate

50 l/min ± 5 % accuracy (meets ISO 21501-4 and JIS B9921)

Battery life

> 3 hours of continuous operation

Temperature Range

2 oC to 35 oC


Built-in thermal printer (also available without printer)


Two years



TSI 9510 9310 9350 9550 9500 quick start guide

  • Technical Document
  • PDF file
  • 673 KB

TSI 9510 9310 9350 9550 9500 user manual

  • Technical Document
  • PDF file
  • 2 MB

TSI AeroTrak 9350 and 9550 data sheet

  • Technical Document
  • PDF file
  • 193 KB

TSI AeroTrak accessories data sheet

  • Technical Document
  • PDF file
  • 564 KB

TSI TrakPro Lite data sheet

  • Technical Document
  • PDF file
  • 2 MB



I have turned the unit on but I am unable to get the unit to read zero before I start my test, what's wrong ?


If the zero filter has been fitted to the unit, ensure that it has been screwed down tightly, this is the most common cause of erronious data.  Also if the instrument has been transported between sites run the pump for a couple of minutes to remove any loose particles that may be present within the system.


How long will the unit run on it’s own battery ?


On continuous running is approximately 3 hours .


Does my particle counter comply with ISO 14644-1:2015 ?


Yes, all current production instruments comply with the 2015 edition of ISO 14644.  These all have version 2.6 or later of the instrument firmware, and older units can be upgraded to this if they are retured to BSRIA or to the manufacturer.

Visa, Visa Debit, Mastercard, Maestro cards accepted BSI ISO 9001 Cyber Essentials Investors in People