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Aeroqual AQM60 User Guide
1.12. Pneumatic Connections
The airlines and connections are shown in the figure below for a three gas AQM. The sample gas passes
into the Gas Treatment Module (GTM) and is distributed to the sensors via a PTFE manifold. The gas
modules sample from the PTFE manifold via a central pump located in the gas treatment module. The
solenoid can switch between the ambient air sample and air which has passed through an absorbent
scrubber for baseline measurements. The sample inlet tubing is PTFE tubing which is inert and smooth
walled. The module exhaust tubing is Tygon 3603 PVC tubing.
Note:
The ports on the manifold which are not used must be capped off to prevent leaks.
An adjustable bypass valve is included between the vacuum and pressure side of the pump. This is to allow
an adjustment to be made to the module flow rates and to relieve the excess pressure placed on the pump
when only one or two modules are installed.
The total sample flow rate will be dependent on the number of gas sensor modules in the AQM. All module
flows are controlled by critical orifices located within the sensor modules. See Section 7.3.3.for expected flow
rates.
AQM inlet
¼’ Swagelok
compression fitting
Solenoid
Pump
Zero
Scrubber
Inlet Exhaust
Gas
Module
Inlet Exhaust
Gas
Module
Inlet Exhaust
Gas
Module
AQM exhaust
= Luer fitting
= Capped luer
fitting
= Tygon tubing
= PTFE
tubing
Filter 5 µm
PTFE
Flow
Bypass
Valve
Gas treatment module (GTM)
Summary of Contents for AQM60
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