Description
Palas CD 2000 series bipolar corona discharge units are used to neutralize the charge of a dust or liquid aerosol or even to electrically charge it, as required. For this purpose, a current is set on the positive and negative high voltage source so high that it is still fully conducted through the corona discharge generated at the tip in the corona chamber, but no (or few) sparks are generated. This current is programmed via the current limitation of the high voltage power supplies. The voltage limitation is set slightly higher than is necessary for the current determined, such that this current flows under all circumstances (temperature, condition of the electrode). The positive and the negative high voltage supplies and the CD 2000 are independent of one another and are independently adjustable.
Key Features
- No operation license required for radioactive instruments
- Bipolar discharge through negative and positive ions
- Applicable for solid and liquid aerosols
- Robust design
- Simple operation
- Reliable function
- Low maintenance
- Reduces your operating expenses
Applications
- Discharge of electrically charged aerosols
- Aerosol research
- Filter testing
Palas CD 2000 Variations
- TYPE A is for lower mixed air flow
- TYPE B is for higher mixed air flow
A dust or liquid aerosol is supplied at the aerosol inlet. The particles in this aerosol have to be discharged. The mixed air inlet is fed with dry, pressurized air. The mixed flow air is passed through two ionization chambers. In these chambers, the air is enriched with ions from the corona discharge with positive and negative high voltage. The aerosol air stream and the mixed air enriched with ions are mixed in a small mixing chamber. The charges of the particles in the aerosol are neutralized by the ions in the mixed air. This takes a certain time. That means, the complete discharge only occurs in the volume after the CD 2000 outlet (example: in the tubing system or the upper part of a filter holder). An approximate value for the dwell time is 0.5 seconds. A satisfactory discharging effect was found in configurations that ensure a dwell time of at least 0.2 seconds.
