diff --git a/config/devices.properties b/config/devices.properties
index 301571d..3a86bff 100644
--- a/config/devices.properties
+++ b/config/devices.properties
@@ -17,6 +17,7 @@ bpm1b=ch.psi.pshell.epics.ChannelDouble|X12SA-OP-BPM1:Current2:MeanValue_RBV -1
 bmp1c=ch.psi.pshell.epics.ChannelDouble|X12SA-OP-BPM1:Current3:MeanValue_RBV -1 true|Read||true
 bpm1d=ch.psi.pshell.epics.ChannelDouble|X12SA-OP-BPM1:Current4:MeanValue_RBV -1 true|Read||true
 bpm1s_4ch=ch.psi.pshell.epics.ChannelDouble|X12SA-OP-BPM1:SumAll:MeanValue_RBV -1 true|Read||true
+bpm1sig_4ch=ch.psi.pshell.epics.ChannelDouble|X12SA-OP-BPM1:SumAll:Sigma_RBV -1 true|Read||true
 bpm3a=ch.psi.pshell.epics.ChannelDouble|X12SA-OP-BPM3:Current1:MeanValue_RBV -1 true|Read||true
 bpm3b=ch.psi.pshell.epics.ChannelDouble|X12SA-OP-BPM3:Current2:MeanValue_RBV -1 true|Read||true
 bmp3c=ch.psi.pshell.epics.ChannelDouble|X12SA-OP-BPM3:Current3:MeanValue_RBV -1 true|Read||true