Filter defect detection procedure for HALO
Acetone is a solvent that evaporates easily and quickly at room temperature; it is a good tracer for estimating the level of defect in molecular filters. This procedure presents two methods for evaluating defects in activated carbon filters. After evaporating a small amount of acetone inside the device, either an acetone detection tube or a PID detector can be used. This allows you to determine whether a filter replacement is necessary.
Filter defect detection using colorimetric tubes
Required equipment list:
- Approximately 5 ml of acetone (not provided)
- Absorbent paper (not provided)
- Dish or crucible (not provided)
- Tygon tubing (provided). Do not use other materials, such as silicone, which may adsorb acetone and distort the measurement
- Sampling pump (not provided)
- Colorimetric tube (not provided)
The list of equipment not supplied by Erlab can be purchased from various manufacturers such as Gastec, Draeger, RAE System or their authorized distributors.
Always use a pump and tube of the same brand.
Gastec tube ref.: 151 L (2 pump strokes)
Drager tube ref.: 81 03 381 (1 pump stroke)
RAE tube ref.: 10-111-40 (100cc to be sampled)
Switch on the device.
Soak a rolled paper placed in a container located below your Halo.
5 ml of acetone (min 98%).
Connect the tubing near a clean air diffuser.
Break off both ends of the colorimetric tube. Each pump is usually equipped with a tool for safely breaking the tube.
Connect the broken tube to the pump, ensuring it is inserted in the correct direction. Colorimetric tubes are marked accordingly.
- Proceed with aspiration through the colorimetric tube. Check the number of pump strokes required as indicated by the manufacturer.
- If the detection threshold of the tube is exceeded, proceed with changing the filter(s).
Filter defect detection using PID detector
Required equipment list:
- Approximately 5 ml of acetone (not provided)
- Absorbent paper (not provided)
- Dish or crucible (not provided)
- Tygon tubing (provided). Do not use other materials, such as silicone, which may adsorb acetone and distort the measurement
- Détecteur PID (non fourni)
The list of equipment not supplied by Erlab can be purchased from various manufacturers such as RAE System or their authorized distributors.
Switch on the device.
Soak a rolled paper placed in a container located below your Halo.
5 ml of acetone (min 98%).
Connect the tubing near a clean air diffuser.
- Connect the end of the TYGON tubing to the PID detector's sampling inlet
- Select the target gas 'Acetone' from the PID menu (refer to the user manual if necessary)
- If the PID detector shows a concentration above 5 ppm, proceed with changing the filter(s).