Load cell

I've heard of AC voltage excited load cells but not at 220VAC. Can you get the brand and model number? If you can, try to look it up by googling. I don't know what a morehouse ring looks like. I've seen pictures of load cells that look like a shackle but I'm not sure if it's the same.

If you have test weights, you could hang them on the load cell and get readings for each weight. Then you could use interpolation to determine the minimum and maximum. Shouldn't be difficult.

I do not know what does morehouse ring look like but your sensor element sounds like a LVDT. Although ususal excitation voltage is much lower than 220V, I have come across with LVDT's that uses 115V-60Hz excitation. therefore 220V is not out of question (just a lot of turns for primary coil).

At the neutral position, LVDT will produce the same secondary rms voltage (on the remaining two sets of two wires) but the phase are 180 deg out. By connecting two secondaries in series with correct polarity, you get phased output.

Alternatively, rectify two secondaries and connect each to a load resistor. read the resultant voltage on the series connected load resistors which will be bipolar reflecting the core position. A precision rectifier will be needed to remove the dead-band and error from the diode forward voltage.

pulto45

In tensile testing,old design is of proving ring shaped,to replace wornout proving ring.

But usual excitation voltage is to the order of 10 to 20 vdc or ac.Please check this data.Due to hogh excitation voltage,you must have blown off the cell.

After loading with 220vac ex.,is load cell still showing continuety?

6 leads are-

2 for ex.

2 for signal

2 for sense-for cable length compensation.

If any further help is required,please contect me.

J.R.VACHHANI

ADI ARTECH

I would say its almost certainly a proving ring with a displacement measuring device to measure the deflection of the proving ring when under tension.

The 220 Volt input must be to this measuring device, it will not bo to the excitation of the sensor!

The sensor almost certainly will derive its excitation from the measuring device.

You don't say whether you can see inside the load 'cell'? is it encased perhaps with a digital display?

As for the 6 wires, if you've got 220 Volts going in 3 would be for the mains and the other three for maybe alarm outputs, analogue output and ground???

Without more information its impossible to tell - I am assuming that you know that it works from the mains and not from a plug top power supply or something....?

John.

Dear KikoKiko,

TRy this lead, you may get it faster.

You may want to go for a linear voltage converter to meet you

data acquisition card talk to your loadcell. (It is not Morehouse for shure unless

they have designed a kind of hybrid wich I doubt)

http://www.futek.com/product.aspx?t=load&gclid=CN63nPXXy4gCFQYxUgodqkCDKA

http://jb.smba.go.kr/test/t2.htm

Regards

Myemail@netvision.net.il

Avigdor Jakubsinky

Last time I came across AC excited load cells it was on a French made box testing machine, it was old in 1980. The 8 strain guages connected as two bridges in this case were part of a tuned circuit and there was a frequency shift with load change. That was 26 years ago and I had to remake the parts myself. I don't think I can help much more without more detail.