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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.

We have created a check list of things to do when sending your air samplers in for a service.

Get Check List

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What our customers say

Julie Bowden, QA Releasing Officer

Pharmacy Manufacturing Unit, Portsmouth

"Friendly, helpful, efficient. Always get a prompt reply to any query. Always feel like a valued customer. Definitely feel like the company cares about it's customers and respects the industry we work in."

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."

Microbiology Technician

Industrial Pharmaceutical Company

"The service from Cherwell is excellent, they will always try to provide help where possible."

Quality Manager

BioDivide Ltd

"Great customer service and always keeping our company informed of changes particularly concerning regulatory matters that could impact us. Helpful, friendly, efficient."

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."

Manager

Industrial Pharmaceutical Company

"Service from Cherwell is outstanding. The equipment is extremely reliable. That's what we ask for."

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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

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, 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.

Cherwell is different

Supplying products is only the start

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The best products prepared for you

Our Redipor® media products are batch tested, QC certified and delivered when you need them

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Bespoke accessories and services

We provide additional equipment or services to make your environmental monitoring more effective

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Best customer service

We build long-standing client relationships on understanding, commitment and trust

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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