diff --git a/config/blazer.yml b/config/blazer.yml
index c330e1f..e9984c7 100644
--- a/config/blazer.yml
+++ b/config/blazer.yml
@@ -22,6 +22,7 @@ data_sources:
     use_transaction: true
 
     smart_variables:
+      local_type: "select distinct local_type from sensors"
       # zone_id: "SELECT id, name FROM zones ORDER BY name ASC"
       # period: ["day", "week", "month"]
       # status: {0: "Active", 1: "Archived"}