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Posted:
Thu Nov 22, 2007 4:06 pmby Sandra
I am searching for a transmittor to my load cell, does anyone have any suggestions where to find a good one??
Posted:
Fri Nov 23, 2007 8:18 amby 99-1134301289
hello, for my engine dyno project I have a load cell like that
[url=http://cgi.ebay.fr/CRANE-Hanging-Tension-Load-Cell-SCALE-5-000lbs-NEW_W0QQitemZ180183080283QQihZ008QQcategory
Z4678QQssPageNameZWDVWQQrdZ1QQcmdZViewItem]http://cgi.ebay.fr/CRANE-H....iewItem[/url]
Posted:
Fri Nov 23, 2007 10:02 amby 86rocco1
The dyno I use in a rather old one, it has (had) all mechanical instrumentation, it's load cell is a hydraulic cylinder which connects to a pressure gauge to display torque, I connected a Honeywell MLH pressure sensor similar to to the hydraulic load cell
Posted:
Fri Nov 23, 2007 2:13 pmby Sandra
I think we have a missunderstanding. I already have a loadcell. What I am looking for is the device that transform the signal from the loadcell to analog output, for example 0-10V.
Posted:
Fri Nov 23, 2007 2:34 pmby bruce
You need a Signal Conditioner.
Posted:
Fri Nov 23, 2007 4:20 pmby Tony
Perhaps more commonly known as a "strain gauge amplifier". I did look on e-bay but found nothing at all listed at the moment. If you are patient, something may eventually turn up. Otherwise buying new may be the only alternative.
More often than not, these strain gauges connect up direct to a multi channel data acquisition system. Finding an individual single channel strain gauge external amplifier, all by itself might be difficult. But something like this TMO-1 perhaps ?
Google might pick up alternatives more to your taste.
That TMO-1 was just the first Google hit I came to. It illustrates the sort of thing needed to do the job. I am in no way recommending it, there may be better alternatives if you search further. But it would probably do the job.
My own dyno does not use a strain gauge load cell, so I do not have this problem.
Posted:
Fri Nov 23, 2007 4:40 pmby bruce
Posted:
Sun Nov 25, 2007 10:00 pmby 49-1183904562
Sandra;
It would help if we know what is the output of your load cell? Mechanical, Analog voltage etc. "Details"
It sounds like you are trying to feed an ADC for analisys.
Rick
Posted:
Mon Nov 26, 2007 5:52 pmby Tony
Load cells all work in pretty much the same way. There are usually four strain gauge elements connected in a bridge circuit, with four external connecting wires connected to an external power source, and an amplifier:
Electrical output is always extremely low, usually only a few millivolts, and a very high quality amplifier and very stable power source for the bridge element are required. It is not the sort of thing you can successfully build yourself, unless you really know what you are doing.
A zero to ten volt full scale analog output is fairly standard for most commercial strain gauge amplifiers, so you should be o/k.