Ned, Any calibrated static charge meter should work ok. They run about $400 to $600 dollars from many vendors (ACL, 3M, Ion Systems, etc.). You probably will want to test worst case - dry pump, gloved hand, unit sitting on an insulated surface. One person pumps while the other holds the meter. Have them pump as fast as possible. Check the body of the pump, the plunger, and the surfaces of the plastic container for charge. I would use a dry wooden platform, and secure the container to it, to prevent charges caused by movement of the container against the insulated surface. Do not use polyethelene for the support, as it is well known for generating static when a poly container is moved across it. There have been several nasty fires at gas stations when people try to fill containers sitting on a bedliner during winter. A charge is generated when the container is dragged toward the tailgate, the nozzle is brought near, and a fire results from the discharge.
A quick check to be sure that the meter is ok is to hold it near a tape dispenser (clear office type tape) while rapidly pulling a couple feet off the roll. Hope I've been of some help. Scott Lacey > -----Original Message----- > From: Ned Devine [SMTP:[email protected]] > Sent: Thursday, December 16, 1999 9:42 AM > To: 'IEEE, EMC/Product Safety' > Subject: Measuring ESD > > > Hello, > > I need some help from the ESD experts. I am trying to find a way to > measure > the electro-static build-up on a hand operated pump. The device is used > to > suck out the gas from small gas engines before the service. Obviously, an > ESD event would not be a good thing. We are trying to validate some > design > concepts for the customer. > > The pump is a piston type. It sort of looks like a giant syringe with a > one > way valve. The pump has integral threads and is screwed to a large 2-3 > gallon plastic tank. The pump is used to create a vacuum in the tank. > You > need to pump, really pull, it 10-15 times to get the necessary vacuum. > > A siphon hose is attached to the tank. You open a clamp on the hose to > suck > the gas into the container. > > I think I need a static monitor or field meter. Does anyone have any > ideas > on test equipment or test methods? I did a search and I came up with John > Chubb Instrumentation, model JCI 140 Static Monitor. Does anyone have any > experiences with this meter or others? > > Ned Devine > Entela, Inc. > Program Manager III > Phone 616 248 9671 > Fax 616 574 9752 > e-mail [email protected] > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to [email protected] > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to [email protected], > [email protected], [email protected], or > [email protected] (the list administrators). > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
