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Turn on the pump, start the sampling event and leave to sample for a given time.
Be aware that different analytes will have different retention volumes on a
given sorbent.
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After the sampling period has passed, stop the sampling event and record the
sample time. This is displayed on the ACTI-VOC PLUS display screen.
■
Remove the TD tube from the tubing adapter and cap with long-term storage
caps (C-CF020). You should do this by finger-tightening each cap, and then
quarter turning with the CapLok tool provided.
– See CapLok tool how-to video for further information.
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Calculate the total air volume sampled using the following formula:
Total air volume (L) =
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Your tube is now ready for analysis, and your pump can be used for additional
samples at the same flow rate.
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To power the pump off, press and hold the Power key until the Power down
window appears and the countdown is complete.
5.6
Using constant-pressure mode
Constant-flow mode is the recommended operating mode for TD applications.
Constant-pressure mode allows pumping in the flow range of 1-500mL/min, but the
range is dependent on tube impedance and the flow needs to be adjusted with a
third-party in-line flow controller (not supplied with the pump – contact your local
Markes International dealer for more information). Flows greater than 450 mL/min
will not be achievable with all TD tube types.
To switch to constant-pressure mode, use the navigation keys to select control
mode, then select:
■
CPL (Constant Pressure Low), 1–449 mL/min
CPH (Constant Pressure High), 450–5000 mL/min
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To set the pressure that will be maintained in the constant-pressure mode:
Select 'Run Setup' from the main menu screen, then use the adjustment keys to
■
alter the press set value before pressing enter to set the value.
Page 16
Sample flow rate (mL/min) х Sample time (min)
1000
QUI-1164
www.markes.com
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