diff --git a/site_ansto/instrument/config/source/source_common.tcl b/site_ansto/instrument/config/source/source_common.tcl
index 7e8738ea..6c2832ee 100644
--- a/site_ansto/instrument/config/source/source_common.tcl
+++ b/site_ansto/instrument/config/source/source_common.tcl
@@ -90,6 +90,20 @@ proc ::source::ic_initialize {guide} {
       sicslist setatt cns_flow long_name cns_flow_temp
       sicslist setatt cns_flow mutable true
       sicslist setatt cns_flow units "ls-1"
+
+      ::utility::macro::getset float cg123He_temp {} {
+        set str [opal "CG 1,2,3 HELIUM TEMPERATURE"]
+        set value [lindex [lindex [split $str =] 1] 0]
+        if [string is double $value] {
+          return "cg123He_temp = $value"
+        } else {
+          return "cg123He_temp = -1"
+        }
+      }
+      sicslist setatt cg123He_temp klass source
+      sicslist setatt cg123He_temp long_name cg123He_temp
+      sicslist setatt cg123He_temp mutable true
+      sicslist setatt cg123He_temp units "K"
     }
     "thermal" {
     }