diff --git a/src/specificClass.js b/src/specificClass.js
index 3c2364c..2671c19 100644
--- a/src/specificClass.js
+++ b/src/specificClass.js
@@ -119,7 +119,11 @@ class Reactor {
       return;
     }
 
-    const position = measurement.config.functionality.positionVsParent;
+    if (measurement.config.functionality.distance !== 'undefined') {
+      const position = measurement.config.functionality.distance;
+    } else {
+      const position = measurement.config.functionality.positionVsParent;
+    }
     const measurementType = measurement.config.asset.type;
     const key = `${measurementType}_${position}`;
     const eventName = `${measurementType}.measured.${position}`;
@@ -317,8 +321,8 @@ class Reactor_PFR extends Reactor {
 
   _updateMeasurement(measurementType, value, position, context) {
     switch(measurementType) {
-      case "oxygen":
-        grid_pos = Math.round(position * this.n_x);
+      case "Quantity (oxygen)":
+        grid_pos = Math.round(position / this.config.length * this.n_x);
         this.state[grid_pos][S_O_INDEX] = value; // naive approach for reconciling measurements and simulation
         break;
     }