Is My Load Cell Transmitter Outputting ±10V Instead of ±5V?

Hi all,
I bought a load cell transmitter (SKU: ATO-LCTR-OA) from ATO that’s supposed to output ±5V (it even says ±5V on the sticker). But when I tested it, it really looks like it’s outputting ±10V instead.
For example, I applied about 75 Nm of torque and measured roughly 5V on the analog output with an oscilloscope. That would make sense if full scale were ±10V, not ±5V.
Is there some internal setting to switch the output range, or does this mean I received the wrong version and need to change it?

Patton wrote:Patton, the analog signal output by the transmitter is usually fixed. It has been calibrated at the factory and cannot be adjusted.

Please confirm what voltage signal the amplifier outputs (V)? What is the corresponding applied torque (Nm)?

Patton wrote:If you’re getting 5V at 75 Nm, that definitely sounds like a ±10V full-scale setup. What’s the rated torque of your sensor? If 75 Nm is about half of full scale, then ±10V would make perfect sense. Some of these units are factory-set and there’s no internal switch.

Patton, if you want the amplifier to output the correct signal, the amplifier and torque sensor need to be calibrated.

You can refer to this video for the calibration method. The video demonstrates calibration with a load cell. In your case, you just need to replace the weight with the applied torque.
see on: https://www.youtube.com/watch?v=o3bVCWKPT0s&list=PLlo8RulDRnth25OFq-RKmYSKG9zkpeAZB&index=5

When calibrating, the target torque should preferably be 20% or 50% of the sensor’s rated range to ensure more accurate calibration.

Got it. I’m not in the lab today so I couldn’t run a full calibration, but based on what I saw — ~75 Nm giving about 5V — it really looks like it’s scaled for ±10V, not ±5V. I’ll redo the test properly tomorrow with known torque values and see what the full-scale output actually is before deciding what to do.