diff --git a/python/hfc/hfc.py b/python/hfc/hfc.py
index 7e03cc6..63ae9af 100644
--- a/python/hfc/hfc.py
+++ b/python/hfc/hfc.py
@@ -639,7 +639,7 @@ class ModbusGasAnalyzer:
                     if self.concentration < 0:
                         print(f"DEBUG - : {self.concentration} -> 0")
                         self.concentration = 0.0
-                    elif self.concentration > 90:
+                    elif self.concentration > 99.99:
                         print(f"DEBUG - : {self.concentration} -> 随机数")
                         self.concentration = round(random.uniform(99.960, 99.990), 3)
                     else: