Markes International Easy-VOC C-EZVOCPO User manual
Easy-VOC™
QUI-1073
Version 3
August 2019
www.markes.com
Instruction for use
Product reference:
Easy-VOC grab sampler C-EZVOCPO
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QUI-1073
1. Introduction
The Easy-VOC facilitates simple and rapid ‘grab-sampling’ of precise volumes of air/
gas (50 or 100 mL) directly onto sorbent tubes without the need for calibration.
The small air/gas volumes sampled by the Easy-VOC reduce the risk of analyte
breakthrough, extend the application range of sorbent tubes by allowing quantitative
retention of more volatile compounds, and minimise water management issues.
Typical sampling volumes are 50–500 mL.
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2. Operation
2.1 Leak-checking
The pump should be leak-tested before
use to ensure the volume taken is
accurate. Fit the sampling end of a
thermal desorption (TD) tube with a
long-term storage cap.
[1] Position the tube, non-sampling
end rst, into the pump inlet. The
tube should seal against the
rubber in the inlet without
tightening the pump inlet nut.
Note. The sampling arrow should
be facing towards the pump.
[2] Align the pump shaft alignment
mark with the volume indicator
(red dot) on the plunger (either
50 mL or 100 mL).
[3] Attempt to pull the plunger back
slowly. The plunger will show
complete resistance to movement
if the seal is leak-tight. Any
backwards motion of the plunger
will indicate a leak.
Step [2]: Inserting the tube for leak‑testing.
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QUI-1073
2.2 Taking a sample
[1] Position the sampling tube,
non‑sampling end rst, into the
pump inlet.
NOTES The sampling arrow should
be facing towards the pump.
[2] Select the sample volume required
by aligning the volume indicator
(red dot) on the plunger with the
pump shaft alignment mark.
[3] Pull the plunger handle slowly and
evenly until it latches at half-
stroke or full-stroke (50 or
100 mL). This should take
between 5 and 10 seconds.
Step [2]: Selecting 50 mL volume.
Step [2]: Selecting 100 mL volume.
Step [3]: Pulling out the plunger.
Step [1]: Inserting the tube for sampling.
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[4] When the ow has stopped, rotate
the plunger either:
■A quarter-turn clockwise (after
taking a 100 mL sample
volume), or
■A quarter-turn anticlockwise
(after taking a 50 mL
sample volume).
[5] Return the plunger to its starting
position without removing the
sampling tube.
[6] For additional pump strokes,
repeat steps [2]–[5] without
removing the sampling tube from
the pump. The number of strokes
taken can be recorded by rotating
the counter on the pump.
[7] After sampling, remove the tube,
and cap it, either with long-term
storage caps for storage or
transport, or DiffLok™caps
for analysis.
Step [5]: Returning the plunger to
its starting position.
Step [6]: Record the number of strokes.
Step [4]: Rotating the plunger. Left: For a
100 mL sample. Right: For a 50 mL sample.
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QUI-1073
3. Maintenance
3.1 Pump inlet
The rubber pump inlet can become worn
with use, resulting in leaks.
[1] If you suspect the pump inlet is
damaged, unscrew the pump inlet
nut and inspect it, along with the
inlet lter.
If they are dirty, clean them and
perform a leak check on the pump.
If the pump is still leaking, replace
the pump inlet or inlet lter
as necessary.
3.2 Plunger gasket
The plunger gasket may leak if worn or not
well-lubricated.
[1] To access the gasket, unscrew the
pump end tting on the handle
side, and pull the plunger out of the
pump shaft.
[2] Inspect/replace the gasket, then
carefully push the plunger back into
the shaft – use a ne screwdriver or
tweezers to help ease the gasket
into the shaft.
[3] Lubricate the inside of the shaft
with vacuum grease to ensure a
good seal.
Plunger gasketPump end
tting
Pump inlet nut
Rubber
inlet
Inlet
lter
NOTES Do not over-tighten the plunger gasket.
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3.3 Check valve
The check valve may cause leaks if worn
or not well-lubricated.
[1] Unscrew the end tting on the inlet
side and pull out the disk-shaped
rubber-inlet check valve.
[2] Replace as necessary, adding a
light coat of grease around
the hole.
Inspect the gasket ring in the pump end
tting, and replace if it is damaged,
before screwing the end tting back on.
Check
valve
Gasket
ring
Pump end
tting
QUI-1073
4. Contact details
For technical support, please contact your supplier in the
rst instance. If they are unable to resolve your query, please
contact Markes International’s service department:
E: suppor[email protected]om
T: +44 (0)1443 230935
W: www.markes.com
For an instructional product video, please visit:
chem.markes.com/EasyVOC
Scan the code to
watch the video
L-0143 (160819-3)
Easy-VOC™and DiffLok™are a trademarks
of Markes International.
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