Mr. Hew How Chee: - Measuring ion flux is not a major problem. Build an ion flux detector as follows: Make a "charge plate" out of a piece of alum., brass, copper, (anything of that sort). The plate needs to be about 15cm square (15cm X 15cm). Get a piece of screenwire the same size as the charge plate. The screenwire should have approximately 3mm to 6mm screen grids and mount the screenwire parallel to, but about 6mm to 8mm in front of the charge plate. Keep the screenwire and the charge plate electrically isolated from each other. Get a High Voltage DC power supply (3,000 to 4,000 volt range) and connect the positive voltage (+3,000 V-dc) to the charge plate. Connect the return (ground) side of the power supply to the screenwire. Put a nanoammeter ( 0 + 20 nanoamp) in the ground wire between the screenwire and the return side of the power supply. Turn the power supply on at about 3,000 volts and check to make sure no current is registered on the nanoammeter. (If any current registers you have a high-resistance short or leak in the system which must be eliminated before continuing.) When no current flows with the power supply turned on, move the air ionizer to about 1-meter in front of the screenwire/charge plate and turn the ionizer on. The nanoammeter will register a current which indicates the quantity or volume of positive ions generated (negative ions will all be attracted to the charge plate). To see if your ionizer is balanced (that is producing the same number of positive and negative ions) just reverse the polarity of the system (+ voltage on the screenwire and negative (return side) on the charge plate. - Hope this method helps confirm/deny that your ionizer works. Regards, Jim Moffitt, Moffitt Enterprises Consulting Service. ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################