RE: Air Flow Meters
I have a Kurz, model 441s hot wire probe unit. Refer to http://www.kurz-instruments.com/ Regards, Peter L. Tarver, PE Product Safety Manager Sanmina Homologation Services peter.tar...@sanmina.com -Original Message- From: Kurt Mikolajewski [mailto:kmiko...@catena.com] Sent: Monday, February 26, 2001 7:02 AM To: 'Joe Finlayson'; 'EMC PSTC' Subject: RE: Air Flow Meters Joe, One product I have found that uses wire probes is the ATM-24 from Cambridge AccuSence, Inc. Regards, Kurt Mikolajewski Catena Networks Voice: (613) 599-6430, x8551 Voice (Internal):8551 Email: kmiko...@catena.com -Original Message- From: Joe Finlayson [mailto:jfinlay...@telica.com] Sent: Friday, February 23, 2001 4:03 PM To: 'EMC PSTC'; 'NEBS Newsgroup' Subject: RE: Air Flow Meters OK, thanks for all the replies. It appears I am in search of a Hot Wire Anemometer. I've found several on the web, but all seem to use a telescoping probe for measurement, probably for air ducts. Does anyone know of a model that uses a wire for measurement so I can affix it to a modular plug in card, thus sealing the chassis. My goal is to measure air flow rates in each of 21 slots while the cards are installed (thus sealing the chassis for realistic air flow). Thx, Joe -Original Message- From: Joe Finlayson Sent: Friday, February 23, 2001 8:41 AM To: 'EMC PSTC'; 'NEBS Newsgroup' Subject:Air Flow Meters I'm interested in doing an air flow analysis on a per-slot basis for a modular chassis. Can anyone share their experience in using their favorite test tools for this function. One of my colleagues had mentioned that he recalls the use of a thermocouple-type lead that was used at his previous place of employment that measured air flow. Any knowledge of this type of product would be greatly appreciated as well. Thx, Joe * OLE Object: Picture (Metafile) Joe Finlayson Manager, Compliance Engineering Telica, Inc. 734 Forest Street, Bldg. G, Suite 100 Marlboro, MA 01752 Tel:(508) 804-8212 Fax:(508) 480-0922 Email: jfinlay...@telica.com Web:www.telica.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
RE: Air Flow Meters
Joe, One product I have found that uses wire probes is the ATM-24 from Cambridge AccuSence, Inc. Regards, Kurt Mikolajewski Catena Networks Voice: (613) 599-6430, x8551 Voice (Internal): 8551 Email: kmiko...@catena.com -Original Message- From: Joe Finlayson [mailto:jfinlay...@telica.com] Sent: Friday, February 23, 2001 4:03 PM To: 'EMC PSTC'; 'NEBS Newsgroup' Subject: RE: Air Flow Meters OK, thanks for all the replies. It appears I am in search of a Hot Wire Anemometer. I've found several on the web, but all seem to use a telescoping probe for measurement, probably for air ducts. Does anyone know of a model that uses a wire for measurement so I can affix it to a modular plug in card, thus sealing the chassis. My goal is to measure air flow rates in each of 21 slots while the cards are installed (thus sealing the chassis for realistic air flow). Thx, Joe -Original Message- From: Joe Finlayson Sent: Friday, February 23, 2001 8:41 AM To: 'EMC PSTC'; 'NEBS Newsgroup' Subject: Air Flow Meters I'm interested in doing an air flow analysis on a per-slot basis for a modular chassis. Can anyone share their experience in using their favorite test tools for this function. One of my colleagues had mentioned that he recalls the use of a thermocouple-type lead that was used at his previous place of employment that measured air flow. Any knowledge of this type of product would be greatly appreciated as well. Thx, Joe * OLE Object: Picture (Metafile) Joe Finlayson Manager, Compliance Engineering Telica, Inc. 734 Forest Street, Bldg. G, Suite 100 Marlboro, MA 01752 Tel: (508) 804-8212 Fax: (508) 480-0922 Email:jfinlay...@telica.com Web: www.telica.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on Virtual Conference Hall,
RE: Air Flow Meters
Funny you should mention this. I just finished, today in fact, an air flow analysis of a product. Omega style air flow meter. Hot wire type. Measures in linear ft/min. What I had to do was build from cardboard a long tapered cone (about 3 feet long) that I attached around the vents under analysis. It tapered down to a 1 x 4 slot. Did several measurements across the slot to get an average. I used the dimensions of the slot to convert to ft^3/min. Then, roughly to what that would provide as far as maximum wattage allowed by the air flow. The sensor of the device is on an extendable arm like an antenna. Highly accurate and very illumenating. - Doug McKean
RE: Air Flow Meters
OK, thanks for all the replies. It appears I am in search of a Hot Wire Anemometer. I've found several on the web, but all seem to use a telescoping probe for measurement, probably for air ducts. Does anyone know of a model that uses a wire for measurement so I can affix it to a modular plug in card, thus sealing the chassis. My goal is to measure air flow rates in each of 21 slots while the cards are installed (thus sealing the chassis for realistic air flow). Thx, Joe -Original Message- From: Joe Finlayson Sent: Friday, February 23, 2001 8:41 AM To: 'EMC PSTC'; 'NEBS Newsgroup' Subject: Air Flow Meters I'm interested in doing an air flow analysis on a per-slot basis for a modular chassis. Can anyone share their experience in using their favorite test tools for this function. One of my colleagues had mentioned that he recalls the use of a thermocouple-type lead that was used at his previous place of employment that measured air flow. Any knowledge of this type of product would be greatly appreciated as well. Thx, Joe * OLE Object: Picture (Metafile) Joe Finlayson Manager, Compliance Engineering Telica, Inc. 734 Forest Street, Bldg. G, Suite 100 Marlboro, MA 01752 Tel: (508) 804-8212 Fax: (508) 480-0922 Email:jfinlay...@telica.com Web: www.telica.com
Re: Air Flow Meters
Joe The type of airflow measuring kit you have mentioned is a Hot Wire Anemometer. Starting price around $300. They will give you an air velocity reading in m/s or ft per min. You will not get be able to get a true cubic ft per minute reading using this type of device. For that you need a full blown air flow rig with with back pressure compenstation and know measurement apparatus sizes. A lot more than £300. But the Hot WIre Anemometer can be a very handy and easy to use tool. Basically it has a small constant area aperture on the end of a probe. Sitting in the middle is a hot resistor kept at a constant temperature. As the airflow increases, the amount of current required to keep the resistor at this temperature increases, and then the equipment does the smart bit of relating this current to air velocity. An important things to note about using one of these devices is to keep the angle of the aperture, relative to the air flow constant. A change of a few degrees can introduce large measurement errors if your air flows are low. This can be seen by simply rotating the sensor head in an airflow and recording the variation in readings. If you want to get an approximate air flow reading. You can extend a tube out form the slot and by placing the anemometer in the middle, get a reading for velocity through a known area. But this reading will only be an approximate as no account is taken for boundary layer effects of your tube or the presence of the sensor head. Nor will you be certain of the air velocities at the corners if you are measuring the air flow form a non circular slot. But for a generally investigation of air flows across a product, a very useful tool. Joe Finlayson wrote: I'm interested in doing an air flow analysis on a per-slot basis for a modular chassis. Can anyone share their experience in using their favorite test tools for this function. One of my colleagues had mentioned that he recalls the use of a thermocouple-type lead that was used at his previous place of employment that measured air flow. Any knowledge of this type of product would be greatly appreciated as well. Thx, Joe * ... Joe Finlayson Manager, Compliance Engineering Telica, Inc. 734 Forest Street, Bldg. G, Suite 100 Marlboro, MA 01752 Tel:(508) 804-8212 Fax:(508) 480-0922 Email: jfinlay...@telica.com Web:www.telica.com --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org -- Andrew Carson - Product Safety Engineer Xyratex Engineering Laboratory Tele 023 92496855 Fax 023 92496014 --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: jim_bac...@mail.monarch.com Michael Garretson:pstc_ad...@garretson.org For policy questions, send mail to: Richard Nute: ri...@ieee.org
