diff --git a/flows/main.json b/flows/main.json
index 3647027..18cc76b 100644
--- a/flows/main.json
+++ b/flows/main.json
@@ -4057,7 +4057,7 @@
         "repeat": "",
         "crontab": "",
         "once": true,
-        "onceDelay": 0.1,
+        "onceDelay": "0.2",
         "topic": "",
         "payload": "100",
         "payloadType": "num",
@@ -4949,7 +4949,7 @@
         "type": "function",
         "z": "baa1e3d9.cb29d",
         "name": "imaged volume calc",
-        "func": "camera = global.get(\"acq_camera\");\ncell = global.get(\"acq_celltype\");\nnb_frame = global.get(\"nb_frame\");\n\nif (camera == \"HQ Camera\"){\n    volume = nb_frame * (4.15*3.14*cell/1000) / 1000;\n}\nelse if (camera == \"Camera v2.1\"){\n    volume = nb_frame * (2.31*1.74*cell/1000) / 1000;\n}\nelse{\n    msg.payload = \"The camera is not known to this system\";\n    return msg;\n}\n\nglobal.set(\"acq_imaged_volume\", volume.toFixed(4))\n\nmsg.payload = volume.toFixed(2) + \" mL\"\nreturn msg;",
+        "func": "camera = global.get(\"acq_camera\");\ncell = global.get(\"acq_celltype\");\nnb_frame = global.get(\"nb_frame\");\nvar volume = 0\nif (camera == \"HQ Camera\"){\n    volume = nb_frame * (4.15*3.14*cell/1000) / 1000;\n}\nelse if (camera == \"Camera v2.1\"){\n    volume = nb_frame * (2.31*1.74*cell/1000) / 1000;\n}\nelse{\n    msg.payload = \"The camera is not known to this system\";\n    return msg;\n}\n\nglobal.set(\"acq_imaged_volume\", volume.toFixed(4))\n\nmsg.payload = volume.toFixed(2) + \" mL\"\nreturn msg;",
         "outputs": 1,
         "noerr": 0,
         "initialize": "",
@@ -4973,7 +4973,7 @@
         "height": 1,
         "name": "Total pumped volume",
         "label": "Total pumped volume",
-        "format": "{{msg.payload}}",
+        "format": "{{msg.payload}} mL",
         "layout": "col-center",
         "x": 1180,
         "y": 300,
@@ -4984,7 +4984,7 @@
         "type": "function",
         "z": "baa1e3d9.cb29d",
         "name": "acq_volume calc",
-        "func": "var imaging_pump_volume = global.get(\"imaging_pump_volume\");\nvar nb_frame = global.get(\"nb_frame\");\n\nvar acq_volume =  (Number(nb_frame)*Number(imaging_pump_volume)).toFixed(2)\nglobal.set(\"acq_volume\", acq_volume)\n\nmsg.payload = acq_volume + \" mL\"\nreturn msg;",
+        "func": "var imaging_pump_volume = global.get(\"imaging_pump_volume\");\nvar nb_frame = global.get(\"nb_frame\");\nvar acq_volume = 0\n\nacq_volume =  (Number(nb_frame)*Number(imaging_pump_volume)).toFixed(2)\nglobal.set(\"acq_volume\", acq_volume)\n\nmsg.payload = acq_volume\nreturn msg;",
         "outputs": 1,
         "noerr": 0,
         "initialize": "",
@@ -5541,7 +5541,7 @@
         "order": 3,
         "width": 0,
         "height": 0,
-        "passthru": false,
+        "passthru": true,
         "outs": "end",
         "topic": "imaging_pump_volume",
         "min": "0.001",