Load Cell Signal Conditioner

[sbaum]

I am wondering what the best products are out there for signal conditioning load cells. I have done a project in the past using an API 4058 G. ( analog output ) It worked ok for the application and seems to be a good product, however I was somewhat limited in regards to output resolution. I was using an Omron CP1H XA with the onboard analog inputs. I recently did another project utilizing the ALCP digitizer from Totalcomp. It is a Modbus / 485 unit with some great features for a greater price. The internal smart filters work very nice to smooth the signal in a noisy enviroment, and the 400,000 point resolution gave me lots of accuracy. The downside is that one unit could not power the 4 load beams that I needed to read. I like the digital unit better than messing with analog but I need something that can drive at least four 350ohm bridges. Any input or experience on project you have done? Thx SB

[TConnolly]

I've have used Beckhoff IO modules for load cells. You can connect to your PLC using device net, control net, ethernet, profibus, or modbus, or several others. http://www.beckhoff.com/english.asp?bus_terminal/kl3351.htm

[splicer480]

Calex makes some nice models. I have 2 of their 6255 strain gage units. It converts 0-50mv to 100-10100Hz for use with 2 high speed counter inputs on a micrologix 1500 for a batch weighing application. Very dependable and it is very accurate also. www.calex.com