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Tractorsport Flowbench Forum Archive • View topic - Transmittor

Transmittor

Postby Sandra » Thu Nov 22, 2007 4:06 pm

I am searching for a transmittor to my load cell, does anyone have any suggestions where to find a good one??
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Postby 99-1134301289 » Fri Nov 23, 2007 8:18 am

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]
99-1134301289
 

Postby 86rocco1 » Fri Nov 23, 2007 10:02 am

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
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Postby Sandra » Fri Nov 23, 2007 2:13 pm

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.
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Postby bruce » Fri Nov 23, 2007 2:34 pm

You need a Signal Conditioner.
"There is no more formidable adversary than one who perceives he has nothing to lose." - Gen. George S. Patton
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Postby Tony » Fri Nov 23, 2007 4:20 pm

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.
Also known as the infamous "Warpspeed" on some other Forums.
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Postby bruce » Fri Nov 23, 2007 4:40 pm

"There is no more formidable adversary than one who perceives he has nothing to lose." - Gen. George S. Patton
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Postby 49-1183904562 » Sun Nov 25, 2007 10:00 pm

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
49-1183904562
 

Postby Tony » Mon Nov 26, 2007 5:52 pm

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.
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