diff --git a/pyrelacs/ui/mainwindow.py b/pyrelacs/ui/mainwindow.py
index 4499835..025989d 100644
--- a/pyrelacs/ui/mainwindow.py
+++ b/pyrelacs/ui/mainwindow.py
@@ -17,6 +17,7 @@ import uldaq
 import nixio as nix
 import pyqtgraph as pg
 import numpy as np
+import quantities as pq
 
 
 from pyrelacs.dataio.daq_producer import DaqProducer
@@ -39,8 +40,9 @@ from IPython import embed
 
 
 class PyRelacs(QMainWindow):
-    def __init__(self):
+    def __init__(self, config):
         super().__init__()
+        self.config = config
         self.setToolButtonStyle(
             Qt.ToolButtonStyle.ToolButtonTextBesideIcon
         )  # Ensure icons are displayed with text
@@ -79,9 +81,16 @@ class PyRelacs(QMainWindow):
         widget.setLayout(layout)
         self.setCentralWidget(widget)
 
-        SAMPLERATE = 40_000
+        SAMPLERATE = pq.Quantity(
+            self.config.pyrelacs.data.input.inputsamplerate,
+            self.config.pyrelacs.data.input.inputsamplerateunit,
+        )
+        INPUTTRACECAPACITY = pq.Quantity(
+            self.config.pyrelacs.data.input.inputtracecapacity,
+            self.config.pyrelacs.data.input.inputtracecapacityunit,
+        )
         start = time.time()
-        BUFFERSIZE = SAMPLERATE * 10 * 60
+        BUFFERSIZE = (SAMPLERATE * INPUTTRACECAPACITY).simplified
         end = time.time()
         log.debug(f"Buffer allocation took {end - start}")