Load Cell Excitation Power Supply

Peter Laing · Feb 23, 2016

Hey Guys,

I'm looking for a precision 10v or 12v power supply for load cell excitation. It can be either a 120/220VAC input / 10VDC out power supply or a regulation module, 24v in / 10v out. UL/CSA is required if 120/220VAC. Needs long term and temperature range stability, preferably in the order of < 0.5%.

I could easily make up a DIY module, but DIY is not suitable for commercial applications.

Any ideas?

OkiePC · Feb 23, 2016

I have used these in a past life:
http://www.maxcessintl.com/load-cells-tension-readouts/magpowr-tsa-load-cell-amplifiers

Are you looking for just the power supply, or do you want the millivolt signal amplified too? The above modules do both.

Peter Laing · Feb 23, 2016

Thanks OkiePC,
We've been using RedLion IAMA signal conditioners to interface load cells to a 4-20mA plc input. The IAMAs are great, but they don't provide excitation. A generic 12V DC power supply is suitable in many cases, but not when precision is demanded. And I haven't had much luck in finding a precision supply. The MAGPOWER TSA that you mention looks like a good substitute for the IAMA. I'll look into it.

Lovell · Feb 23, 2016

In my experience it is best to contain both excitation and signal conditioning in one unit. I would recommend finding a load cell conditioner with integral excitation.

maybe something like:
https://www.transducertechniques.com/lca-rtc.aspx

Peter Laing · Feb 23, 2016

Anybody had experience with the Weidmueller 8581200000 WAS5 PRO Bridge?

http://catalog.weidmueller.com/proc...E43?page=Group&groupId=("group5872833127421")

sbaum · Feb 23, 2016

No experience with the Weidmuller but have had good success with these...
https://www.laurels.com/transmitter-loadcell.php

Gomez_ · Feb 23, 2016

The Maxcess are good, the current standard at my work are from FMS:
http://www.fms-technology.com/en/emgz-310-amplifier.php

Also have used CMC in the past:
http://www.cmccontrols.com/load-cell-amplifier.shtml

Question, does your load-cell supplier/mfg not have a recommended amp to use?

Peter Laing · Feb 24, 2016

Thanks for all the responses guys. It looks to me like the Weidmueller is the best bet considering Cost/Performance for a transmitter with built in excitation. Still no luck on finding an independent precision 10V supply though.

Load Cell Excitation Power Supply

Peter Laing

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