Unfortunately not, 753R does not have a sensitivity adjustment. Alternatively we have 753CF1 which has sensitivity adjustment.
Sensitivity adjustment controls the detection range and sensitivity of 753CF1 sensor. If set to the maximum position, the detection range is Ø7 m @ 2.5 m height.
If set to the minimum position, the detection range is Ø2 m @ 2.5 m height.
For further information, please visit https://www.clipsal.com/Trade/Products/ProductDetail?catno=753CF1