diff --git a/script/scan_guard.py b/script/scan_guard.py
index 4bd9efe3..ff1896cc 100644
--- a/script/scan_guard.py
+++ b/script/scan_guard.py
@@ -825,7 +825,7 @@ class ScanGuard(object):
             logging.info("test mode. simulated beam loss in %g seconds.", self.test_time_seconds)
 
         while self.running:
-            self._ringcurrent.pv.pend_event(timeout=1)
+            self._ringcurrent.pv.poll()    #pend_event(timeout=1)
             new_beam_ok = self.check_beam()
             if new_beam_ok != self.beam_ok:
                 self.beam_ok = new_beam_ok
@@ -835,8 +835,7 @@ class ScanGuard(object):
                 else:
                     logging.warning("beam down")
                     self.pause()
-
-            #time.sleep(1.0)
+            time.sleep(1.0)
     def check_beam(self):
         beam_ok = self.beam_ok
         if self.test: