List of required components

NR:Type of component:Quantity
2M6 threads 200 mm4
3M6 nuts12
4125 mm clamps2
5134 mm clamps2
6PVC pipe 125×5 mm 280mm1
7PVC 90 degree bend 125 mm1
8Flange 125 mm to 134 mm1
9PMMA pipe 134×5 mm 300mm1
10Mask clamp assembly1
11Air hose connection3
12PVC pipe 32×3.5 mm 100 mm3
13PVC 90 degree bend 32 mm2
14Silicone sealant1
15 PVC tape1

Specification of standard parts used

Particle counter

Portacount pro+ 8038

Particle generator

ATM 226

Air speed control setup

As described in ‘Building manual – breathing resistance setup’, a breathing resistance setup should be built. However, it should be altered by adding a potentiometer and screen to allow the user to change the volume flow. The potentiometer setting tells the Arduino to change the PWM to the blower which changes the volume flow. The resulting flow and PWM setting is displayed on the screen.

The setup for this is dependent on the used hardware and only requires the addition of a pot and screen on the breathing resistance test. Hence will not be discussed in detail here. However, the Arduino code with explanation is included in the downloads. We have used a 16×2 LCD screen setup successfully, which is described in the following web page:

Building steps

Step 1

Make base plate 800 x 400 mm out of suitable material (aluminum, wood, plastic)

Step 2

Attach M6 threads to base plate in specified locations (see CAD-files)

Figure 1: Base plate

Step 3

Attach 125 and 134 mm clamps using the M6 nuts at specified height (see CAD-files)

Figure 2: Base plate with clamps added

Step 4

Attach 125 mm PVC pipe, flange, and 134 mm Plexiglass tube to clamps

Use PVC-tape to guarantee airtight seal between flange and tubes

Figure 3: Pipes added to base plate

Step 5

Connect PVC 90° bend and second PVC 125 mm pipe, rubber seal is present in PVC bend so PVC tape not needed

Figure 4: Upper part of PVC pipe added

Step 6

Connect mask clamp assembly (see CAD-files) to plexiglass tube, use PVC tape to guarantee airtight seal

Figure 6: Mask clamp assembly added

Step 7

Connect 32mm PVC tubing to mask clamp assembly

Figure 7: 32 mm PVC piping added

Step 8

Attach Air hose connectors to plexiglass tube, and to PVC 125 mm tubes. Use silicone sealant to guarantee airtight seal

Figure 8: Air hose connectors added

Connecting to peripherals

Figure 18: Circuit diagram
  1. Connect to output of particle generator
  2. Connect to ambient air tube of particle counter
  3. Connect to test tube of particle counter
  4. Connect to air control setup


Setup build files:!AqC74CqqYVbpgeAzZVDdJumXVBTikQ?e=8ef7UW

Setup build files that include the Arduino code for LCD interface:!AqC74CqqYVbpgp8lXFhcQRddVSaKcg?e=6aqwjN