Sensor supply current?
You seem to be suffering from a fairly common misconception about current. Typical power supplies do not push current into loads. Instead, they provide a constant voltage. Under a given voltage, an intrinsic property of the device (AKA resistance or impedance) determines how much current will flow. In other words, the supply sets the voltage, and the device decides what the current will be.

In your case, the data sheet tells you the device will need 290 uA, presumably at some voltage which you didn't mention. This means your supply needs to be capable of at least that much current. Extra capability in the supply doesn't hurt the device, in fact, it's desirable, because when a device tries to draw more current than a supply is capable of, undesirable things happen. Better supplies will reduce their output voltage to keep the current down to what they can handle, but lower voltage may make the device operate erratically, or not at all. In a cheaper supply, you'll pop a fuse. Very poorly designed supplies may even burn out.