--- title: Air Sampler Calibration Service | AnalytiChem UK (Formerly Cherwell) description: "Air Sampler Calibration Service: SAS air sampler recalibration service to ensure maximum performance levels for your environmental monitoring processes" image: https://www.cherwell-labs.co.uk/hubfs/ST_Live_Site_Files/opt_assets/impactair-high-performance-microbial-air-samplers-min.jpg --- [![analytichem_Logo+claim_RGB](https://www.cherwell-labs.co.uk/hs-fs/hubfs/analytichem_Logo+claim_RGB.png?width=7907&height=1706&name=analytichem_Logo+claim_RGB.png "analytichem_Logo+claim_RGB")](https://www.cherwell-labs.co.uk/) [![analytichem_Logo+claim_RGB](https://www.cherwell-labs.co.uk/hs-fs/hubfs/analytichem_Logo+claim_RGB.png?width=7907&height=1706&name=analytichem_Logo+claim_RGB.png "analytichem_Logo+claim_RGB")](https://www.cherwell-labs.co.uk/) [![50th Logo Cherwell logo final](https://www.cherwell-labs.co.uk/hubfs/50th%20Logo%20Cherwell%20logo%20final.svg "50th Logo Cherwell logo final")](https://www.cherwell-labs.co.uk/50-years-of-cherwell) Search # Air Sampler Calibration Service ### All models of SAS air samplers serviced and repaired, with certificate of calibration issued on completion [![Return SAS Air Sampler for Service](https://no-cache.hubspot.com/cta/default/2885977/4421d0fa-de53-4739-859c-1c2fd9ce085f.png)](https://cta-redirect.hubspot.com/cta/redirect/2885977/4421d0fa-de53-4739-859c-1c2fd9ce085f)   ![air sampler service-min](https://www.cherwell-labs.co.uk/hubfs/ST_Live_Site_Files/opt_assets/air%20sampler%20service-min.jpg) #### SAS air sampler calibration service for environmental monitoring purposes ## Certified calibration of all models of SAS air samplers Six-monthly or annual, prompted SAS air calibration service to ensure top functionality of these vital environmental monitoring instruments. Your environmental monitoring process is too important to risk with inaccurate data. We offer a reminder and calibration service to keep your samplers in top condition. Usually performed at our Bicester premises, or on-site if required, we check sampler flow rate to ensure volume of aspirated air is consistent and the instrument is working correctly. Detailed Certificate of Calibration is issued on completion. Free telephone advice also provided to all SAS air sampler customers.   [![book your service today](https://no-cache.hubspot.com/cta/default/2885977/d2a6774c-1f86-4ff8-8e31-743eb490fa05.png)](https://cta-redirect.hubspot.com/cta/redirect/2885977/d2a6774c-1f86-4ff8-8e31-743eb490fa05) ![book-mockup-p-800](https://cdn2.hubspot.net/hub/2040891/hubfs/Clearview/img/book-mockup-p-800.jpeg?width=800&name=book-mockup-p-800.jpeg "book-mockup-p-800") #### A TITLE THAT WILL DESCRIBE YOUR CONTENT OFFER ## WSB - Content Section Ten I think you've let your personal feelings cloud your judgement. Shields up! Rrrrred alert! The look in your eyes, I recognize it. You used to have it for me. Mr. Worf, you do remember how to fire phasers? They were just sucked into space. How long can two people talk about nothing?  The game's not big enough unless it scares you a little. Now we know what they mean by 'advanced' tactical training. A surprise party? Mr. Worf, I hate surprise parties. I would *never* do that to you. Your head is not an artifact! ## Videos ![](https://play.vidyard.com/uNckThrUyjHn6VJhVHhQZP.jpg) ![](https://play.vidyard.com/eUUqDuht5Cyvmvfuh7EoK4.jpg) ![](https://play.vidyard.com/FHfr8kstTZArTuPuRFXnfh.jpg) #### What our customers say #### Manager *Industrial Pharmaceutical Company* "Service from Cherwell is outstanding. The equipment is extremely reliable. That's what we ask for." #### Thomas Mullen, Quality Operations Specialist (QA) *MedPharm Ltd* "I met with representatives from Cherwell at the Cleanroom Technology Conference recently, and found them to be not only approachable and friendly, but also highly knowledgeable and able to help with a query I had on microbial monitoring of compressed air." #### Julie Willis, Senior Assistant Technical Officer *NHS Blood and Transplant* "I am always pleased with the efficiency and quick turnaround time when I send our Air Samplers off to Cherwell for their service." #### Microbiology Technician *Industrial Pharmaceutical Company* "The service from Cherwell is excellent, they will always try to provide help where possible." #### need a microbial air sampler? ## Browse our range of samplers. Contact us for advice on the best options for you [ #### **SAS hand held microbial samplers ** Environmental monitoring instruments for higher grade cleanrooms and isolator cabinets ](https://www.cherwell-labs.co.uk/hand-held-microbial-air-samplers) [ #### **Compressed air samplers ** For testing microbiological quality of compressed air and bottled gas ](https://www.cherwell-labs.co.uk/sas-compressed-air-sampling) [ #### **SAS isolator sampling ** Isolator cabinet and filling line monitoring, these specialist units monitor grade A environments ](https://www.cherwell-labs.co.uk/sas-isolator-sampling) [ #### **NEW Environmental Monitoring Processes and Validation Guide ** Revised and updated to incorporate changes in new EU GMP Annex 1 ](https://www.cherwell-labs.co.uk/new-environmental-monitoring-processes-and-validation-guide-annex-1-landing-page-1) [ #### **microbial air sampler accessories ** Disposable sampler heads, SAS sampler stands and tripods ](https://www.cherwell-labs.co.uk/microbial-air-sampler-accessories) [ #### **Environmental Monitoring: information page ** Visit our environmental monitoring page for products, services and methods ](https://www.cherwell-labs.co.uk/cleanroom-environmental-monitoring) #### FREQUENTLY ## Asked Questions How do I send in my air sampler for a service/recalibration? We have created a check list of things to do when sending your air samplers in for a service. [![Get Check List](https://no-cache.hubspot.com/cta/default/2885977/fdf64d0f-bd1c-458d-8a40-1a7230a6058e.png)](https://cta-redirect.hubspot.com/cta/redirect/2885977/fdf64d0f-bd1c-458d-8a40-1a7230a6058e) How much air should we sample? Typical requirements suggest 1,000 litres per air sample in high risk areas, such as: grade A filling lines, grade B clean rooms, operating theatres etc. As the criticality of the area reduces, the sample size can be reduced. The aim is to achieve a representative sample; so where higher counts would be expected, a smaller sample produces a more realistic number of cfu to count. Should I use contact plates or Petri dishes for environmental air monitoring? SAS samplers were originally designed for Contact plates, however, a Petri dish option has been available for a number of years. It is really a personal choice, although this should be decided at time of purchase, as the sampler will be specifically configured for the plate type chosen. There are advantages for each version and we would be happy to discuss your specific needs. What is the maximum exposure time for settle plates? Settle plates are used to monitor the level of viable particles in the environment through a process of passive air sampling. A viable particle settles on agar plates at a rate dependent on its characteristics and the airflow in the environment. EU GMP Guide Annex 1 has recommended that 90mm settle plates can be exposed in cleanroom environments for up to 4 hours. However, agar plates may dry out during long exposures where the rate of air exchange is high. So, it might be necessary to use deep filled settle plates, or replace the settle plate after a shorter time to ensure satisfactory growth promotion after exposure. What is the difference between general purpose and selective growth media? General purpose media have nutrients that support the growth of most non fastidious culturable microorganisms. Selective growth media contain components that will inhibit the growth of some types of microorganisms, while supporting the growth of others. General purpose media, such as [Tryptone Soya Agar](https://www.cherwell-labs.co.uk/en-gb/growth-media-type-tryptone-soya-agar-tsa), are used to produce total counts. While selective media, such as XLD for Salmonella species, are used to test presence/absence of specific types of microorganism. Can I autoclave my SAS sampler? No, do not put your SAS sampler in a steam autoclave. The only part that can be autoclaved is the drilled head. The unit can be wiped with alcohol wipes to decontaminate it. The only other exception is the SAS Pinocchio, parts of which can be autoclaved. #### ANALYTICHEM UK IS DIFFERENT ## Supplying products is only the start ![cherwell-icon-17-1](https://www.cherwell-labs.co.uk/hubfs/Marketplace/Cherwell%20Labs/imgs/icons/cherwell-icon-17-1.svg "cherwell-icon-17-1") #### The best products prepared for you Our Redipor® media products are batch tested, QC certified and delivered when you need them ![cubes](https://www.cherwell-labs.co.uk/hubfs/Marketplace/Cherwell%20Labs/imgs/icons/cubes.svg "cubes") #### Bespoke accessories and services We provide additional equipment or services to make your environmental monitoring more effective ![cherwell-icon-35-1](https://www.cherwell-labs.co.uk/hubfs/Marketplace/Cherwell%20Labs/imgs/icons/cherwell-icon-35-1.svg "cherwell-icon-35-1") #### Best customer service We build long-standing client relationships on understanding, commitment and trust ![SAS Isolator and Head - low res](https://www.cherwell-labs.co.uk/hs-fs/hubfs/SAS%20Isolator%20and%20Head%20-%20low%20res.jpg?width=1247&name=SAS%20Isolator%20and%20Head%20-%20low%20res.jpg "SAS Isolator and Head - low res") ## Air Samplers for Environmental Monitoring Do you have the right air sampler for your needs? Choosing the best air sampler means that compliance, efficiency and consistency are met with confidence. Learn more about types of air samplers and how each works. Download technical datasheets for each model and brochures to help you make a selection. [![More About Air Samplers](https://no-cache.hubspot.com/cta/default/2885977/86d9b4a2-d9ca-41bd-bf79-a5ae8cb43826.png)](https://cta-redirect.hubspot.com/cta/redirect/2885977/86d9b4a2-d9ca-41bd-bf79-a5ae8cb43826) #### What's next #### Recent news [![Specialist products for boosting microbial EM protocol reliability spotlighted by AnalytiChem UK at Pharmig 2025](https://www.cherwell-labs.co.uk/hs-fs/hubfs/Redipor%20TwistLock%20Contact%20Plates%20with%20GS1%20DataMatrix%20Codes.png?width=50&height=50&name=Redipor%20TwistLock%20Contact%20Plates%20with%20GS1%20DataMatrix%20Codes.png) **Specialist products for boosting microbial EM protocol reliability spotlighted by AnalytiChem UK at Pharmig 2025** 10 November 2025 ](https://www.cherwell-labs.co.uk/cherwell-labs-post/analytichem-uk-highlight-specialist-em-products-pharmig-2025-annual-conference) [![New AnalytiChem UK appointment strengthens customer focus and growth strategy](https://www.cherwell-labs.co.uk/hs-fs/hubfs/Tom%20Pickford%20AnalytiChem%20UK%20Business%20Development%20Manager%20Midlands.jpg?width=50&height=50&name=Tom%20Pickford%20AnalytiChem%20UK%20Business%20Development%20Manager%20Midlands.jpg) **New AnalytiChem UK appointment strengthens customer focus and growth strategy** 20 October 2025 ](https://www.cherwell-labs.co.uk/cherwell-labs-post/new-analytichem-uk-appointment-strengthens-customer-focus-and-growth-strategy) #### Subscribe Receive the latest articles as they are published. #### Contact us Registered Office 7 & 8 Launton Business Centre, Murdock Road, Bicester, OX26 4XB **Phone** Tel: +44 (0) 1869 355 500 **Email** [sales.uk@analytichem.com](mailto:sales.uk@analytichem.com)    ![analytichem_Logo+claim_RGB](https://www.cherwell-labs.co.uk/hs-fs/hubfs/analytichem_Logo+claim_RGB.png?width=2000&height=431&name=analytichem_Logo+claim_RGB.png "analytichem_Logo+claim_RGB") ![BSI-ISO-9001-Certified-50px](https://www.cherwell-labs.co.uk/hs-fs/hubfs/BSI-ISO-9001-Certified-50px.png?width=130&height=77&name=BSI-ISO-9001-Certified-50px.png "BSI-ISO-9001-Certified-50px") AnalytiChem UK ©2025 (Formerly Cherwell) Reg. in England No: 01159518 VAT Reg. 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