Gas flow system

Gas flow through all the gas modules is powered by a single diaphragm pump at the bottom left of the enclosure.

The pump pulls sample air through the module and then pushes air out through the exhaust. This means the sample air passes through the pump after it’s been measured in the module.

Two types of tubing handle the gas flow:

• Before the sample air reaches the sensor in the module, all tubing, including inlet connection and manifold, is non-reactive PFA (shown as blue lines).
• Once the sample air passes through the sensor, all tubing, including exhaust connection and manifold, become flexible Tygon (shown as black lines).

Gas modules are connected in parallel rows inside the monitor’s enclosure.

An inlet manifold (white rings) connects the inlet tubing to each module.

An exhaust manifold (blue rings) connects the exhaust tubing to each module.

For protection, the inlet and exhaust manifolds are hidden behind the insulation inside the left wall of the enclosure.

The inlet manifold connects to a single external sample cane via the sample inlet filter:

The exhaust manifold connects to the vacuum side of the pump.

The pump uses a flow bypass valve to regulate the overall flow through all of the modules simultaneously.