Multi-Tube Sampler Brochure0 pages

MTS-32 Sequential Sampler
Registered in England No. 3414783 VAT Registration 700 8403 76
Mi BMTS32
Introduction
Pumped sampling onto sorbent tubes remains one of
the most popular and versatile air monitoring options
for trace organics in environmental health and safety
applications. It is applicable to vapour-phase organic
chemicals ranging in volatility from n-C3 to n-C26
(depending on sorbent selection - See Mi TDTS Note
#5) and for vapour concentrations from low ppt to high
ppm. The MTS-32 is a convenient, field-portable Multi-
Tube Sequential Sampler from Markes International
Ltd. offering unattended sampling onto multiple tubes
over time.
Applications for sequential sampling
The MTS-32 allows air to be pulled, sequentially,
through a series of up to 32 industry standard (3.5-inch
long x 0.25-inch O.D.) sorbent tubes using constant
flow pump technology. The constant flow pump
ensures that the same flow rate and volume of air is
sampled onto each tube in the sequence regardless of
impedance variations. Key applications include
monitoring diurnal fluctuations of benzene, 1,3-
butadiene, etc. in ambient air, for example in Air
Quality Management areas, and continuous
monitoring of emission events in industrial locations.
Sampling times (1 minute - 99 hours) and flows (5-100
ml/min) may be user selected, but are then fixed for
each tube in the sequence.
Preventing analyte ingress outside the
sampling period
While outside the sampling period, sorbent tubes are
sealed using Markes International patented* diffusion
locking technology. This prevents both diffusive
ingress of atmospheric contaminants and loss of
retained volatiles from sampled tubes. The diffusion
locking technology is either configured into DiffLok™
caps (see figure 2) for use with standard thermal
desorption tubes (3.5-inch long by ¼-inch O.D.) or
incorporated inside Markes unique SafeLok™ tubes
(see figure 3).
SafeLok tubes have the same external dimensions
and sorbent capacity as standard tubes, but contain
inert diffusion-locking inserts in the air space either
side of the sorbent packing. They are compatible with
standard tube accessories - penclips, storage caps,
etc - and have identical retention volume
characteristics to standard tubes. However, these are
not subject to diffusive ingress of contaminants or back
diffusion of retained volatiles. SafeLok tubes are an
ideal complement to the MTS-32, preventing ingress
of loss of volatiles when tubes are not being sampled.
Markes diffusion locking technology has been
demonstrated to prevent both ingress of volatiles and
loss of retained analytes. For more information please
see the associated leaflet on SafeLok tubes.
Sample
tubes in
carousel
Constant
flow
pump
Controller
Integrated
12V
Battery