Measurement and recording of ambient conditions (temperature, RH, and atmospheric pressure) are and instrumentation and HVAC-control issue. Made more complex for larger labs and/or multiple equipment installed that emit significant amounts of heated/humidified air.
There is, of course, the most basic solution of mounting those circular chart recorders about the lab. My solution has been to measure and record where the HVAC-control head is located, and measure/record at the EUT. The other important variables are the placement of the HVAC sensors, placement of exhaust ports, and control of heating/cooling air flow. Data logging is not complex - use decent sensors and an old PC-box or seldom-used server. This will become a legacy system - think very long-term support, so use very simple code (ANSI C or Python) that just streams the data to a CSV file. I recently helped a colleague develop a logging system where each sensor station run by a local microcontroller that dumps data on command via a RS422 current-loop. The remaining issue, for ISO17025 stuff, is calibration. Design modular sensor heads that can be detached and sent to cal lab, or buy sensor stuff intended for that purpose. And if you buy American sensors, you may have to run the data through Google Translate to get British data. Brian -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Julian Jones Sent: Tuesday, May 28, 2013 7:54 AM To: [email protected] Subject: recording Temp, % RH & AP I am interested in how people record the local lab environmental conditions. When we only had one test area it was easy. Has anyone got an automated logging to a database system working that they can recommend ? The fall back would be to buy several discrete meters and have one per area, but then there is the usual error between cheap units. Any suggestions greatly appreciated. Julian Jones Hursley EMC Services Tel: 023 8027 1111 Mob: 07787 523 607 [email protected] Trafalgar House, Trafalgar Close, Chandlers Ford EASTLEIGH, Hampshire, SO53 4BW Company Registration 3301279 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
