Personal Environmental Monitor (PEM)

The Personal Environmental Monitor (PEM) is a lightweight, personal sampling device used with a personal sampling pump to provide effective collection of particulates of either 2.5 (PM2.5) or 10 µm (PM10) aerodynamic equivalent diameter in indoor air. Personal exposure is determined through gravimetric analysis for particle mass and chemical analysis for specific compounds. The PEM is available in 3 different flow rates.

PEM for PM2.5 Flow 2 L/min
PEM for PM2.5 Flow 44 L/min
PEM for PM2.5 Flow 10 L/min
PEM for PM10 Flow 2 L/min
PEM for PM10 Flow 4 L/min
PEM for PM10 Flow 10 L/min
  •  
  • Small and unobtrusive - can be connected to a sample pump and worn in the breathing zone
  • Referenced in EPA Method IP-10A
  • Suitable for ACGIH thoracic TLVs, including sulphuric acid and cotton dust as thoracic particulate matter with 10 µm PEM

The PEM consists of 3 major parts: cap, impaction ring assembly, and base with after-filter. When used with a personal sampling pump at the required flow rate, the aerosol is accelerated through a number of nozzles in the cap. Through inertia, particles larger than 50% cut-point of the sampler impact onto a greased impaction ring and can be discarded after sampling. Particles smaller than the 50% cut-point pass through the impactor and collect on a 37 mm after-filter.

The PEM was developed for indoor air sampling. While it is not an EPA-certified instrument for ambient PM10 and PM2.5 sampling for the National Ambient Air Quality Standard (NAAQS), outdoor use can be effective if there is no excessive wind velocity or rain present at the time of sampling.

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Parallel Particle Impactors (PPIs)

These Parallel Particle Impactors (PPIs) are high performance, reusable Thoracic and Respirable PM Samplers. The patented* design has the power of 4 impactors in one small, conductive aluminium sampler, to provide the closest match to the ACGIH/ISO/CEN thoracic or respirable conventions. Disposable pre-oiled porous plastic impaction substrates reduce the negative effects that particle buildup and bounce can have on the sample accuracy, by firmly trapping larger particles. Unlike other samplers, the sampling efficiency of the PPI is not dependent on the collected particle type.

Thoracic PPI 2L/min
Respirable PPI 2L/min
Respirable PPI 4L/min
Respirable PPI 8L/min
PPI

  •  
  • Lightweight - weighs only 93g
  • 8 L/min Respirable model provides enhanced sampling sensitivity for WEL/TWA silica and other compounds with low target concentrations. Ideal for short term task monitoring. It is referenced in MDHS 14/4.
  • 4 L/min Respirable model provides higher flow option and use of intrinsically safe personal pumps.
  • 2 L/min Respirable model is ideal for standard WEL/TWA sampling.
  • 2 L/min Thoracic model is ideal for metal working fluids, or WEL/TWA monitoring for sulphuric acid, or other compounds with a thoracic limit. It is referenced in MDHS 14/4.

The patented* SKC Parallel Particle Impactor (PPI) samplers contain four small impactors in the inlet section of the device. Each impactor features a unique 50% cut-point to target a specific one-quarter segment of the ISO/CEN curve resulting in a precise fit along the entire curve. A sample pump pulls air through the inlet nozzle of each impactor in the inlet plate. Particles larger than each impactor’s 50% cut-point are scrubbed and retained on the porous oiled impaction substrate, while smaller particles continue to the standard 37 mm collection filter for analysis.

* US Patent No. 7,073,402

Plastic disposable Parallel Particle Impactors (PPIs) are also available.

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Disposable Parallel Particle Impactors (PPIs)

These Parallel Particle Impactors (PPIs) are high performance Thoracic and Respirable PM Samplers. The patented* design has the power of 4 impactors in one small, conductive aluminium sampler, to provide the closest match to the ACGIH/ISO/CEN thoracic or respirable conventions. Disposable pre-oiled porous plastic impaction substrates reduce the negative effects that particle buildup and bounce can have on the sample accuracy, by firmly trapping larger particles. Unlike other samplers, the sampling efficiency of the PPI is not dependent on the collected particle type.

Thoracic PPI 2L/min
Respirable PPI 2L/min
Respirable PPI 4L/min
Respirable PPI 8L/min
PPI

  •  
  • Lightweight - weighs only 93g
  • 8 L/min Respirable model provides enhanced sampling sensitivity for WEL/TWA silica and other compounds with low target concentrations. Ideal for short term task monitoring. It is referenced in MDHS 14/4.
  • 4 L/min Respirable model provides higher flow option and use of intrinsically safe personal pumps.
  • 2 L/min Respirable model is ideal for standard WEL/TWA sampling.
  • 2 L/min Thoracic model is ideal for metal working fluids, or WEL/TWA monitoring for sulphuric acid, or any other compounds with a thoracic limit. It is referenced in MDHS 14/4.

The patented* SKC Parallel Particle Impactor (PPI) samplers contain four small impactors in the inlet section of the device. Each impactor features a unique 50% cut-point to target a specific one-quarter segment of the ISO/CEN curve resulting in a precise fit along the entire curve. A sample pump pulls air through the inlet nozzle of each impactor in the inlet plate. Particles larger than each impactor’s 50% cut-point are scrubbed and retained on the porous oiled impaction substrate, while smaller particles continue to the standard 37 mm collection filter for analysis.

Disposable PPIs are available pre-assembled with:

  • Filter, filter supports, and substrates for chemical analysis (preloaded models)

or

  • Substrates only - add your own filter and filter support for gravimetric analysis

* US Patent No. 7,073,402

Reusable aluminium Parallel Particle Impactors (PPIs) are also available.

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Plastic Cyclone

The SKC Plastic Cyclone is a lightweight conductive plastic unit that holds a collection filter in a reusable cassette during sampling. The cyclone is designed to sample respirable dust as per MDHS 14/4 and the BS EN 481 criteria. When attached to a suitable sample pump respirable particles collect on the filter and larger particles fall into the grit pot, at the base, to be discarded. It is designed for a 50% cut-point of 4.0 µm at 3.0 L/min. The static-dissipating cyclone features a snap-together cassette system and is used at 3.0 L/min flow with a 25 mm or 37 mm cyclone cassette. It includes a grit pot. The SKC Plastic Cyclone 25mm (225-69) is similar to the the Higgins-Dewell design cyclone (2.2 L/min) but operates at 3.0 L/min.

Plastic Cyclone

The SKC Plastic Cyclone has been assessed against the respirable convention, described in BS EN 481 by the Health & Safety Laboratory, UK. A copy of the Certificate of Conformity is included with each cyclone.

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Button Sampler

The Button Sampler is ideal for low level personal or area inhalable sampling. It is a filter sampler with a porous curved-surface inlet designed to improve the collection characteristics of inhalable dust (100 µm aerodynamic diameter), including bioaerosols for total (viable plus non-viable) microbial count. Its conductive stainless steel inlet reduces electrostatic effects. The evenly spaced holes act as sampling orifices for multi-directional sampling. The proximity of the filter to the inlet minimises transmission losses and provides for equal distribution of particle loading and low intersample variation. The Button Sampler uses 25 mm filters, and filters with pore sizes greater than 1 µm are recommended to lower back pressure and to enhance sample times with personal sample pumps.

Button Sampler

  •  
  • Referenced in MDHS 14/4
  • Small and lightweight
  • Autoclavable
  • Low sensitivity to wind direction and velocity
  • Suitable for collecting bioaerosols for viable and non-viable analysis
  • 4 L/min flow rate enhances sensitivity

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