diff --git a/script/SchofieldScan.py b/script/SchofieldScan.py
index e844c9a3..5d1a3db0 100644
--- a/script/SchofieldScan.py
+++ b/script/SchofieldScan.py
@@ -111,8 +111,9 @@ def measure_stuff():
         if ENDSCAN:
             after_scan()    
             
-global initial_energy_range,energy_scale_array, energy_scale_table, VECTOR,pass_energy_hold,angle_time,angle_range,azi_range
+global initial_energy_range,energy_scale_array, energy_scale_table, VECTOR,pass_energy_hold,angle_time,angle_range,azi_range,SENSORS
 bb = 0
+SENSORS = []
 #################### O 1s PhD scan ##############################
 print ' ######################################################'
 print ' **            Begin O 1s PhD                        **'