diff --git a/CapMachine.Wpf/App.xaml.cs b/CapMachine.Wpf/App.xaml.cs
index f0fba45..ada0958 100644
--- a/CapMachine.Wpf/App.xaml.cs
+++ b/CapMachine.Wpf/App.xaml.cs
@@ -136,7 +136,7 @@ namespace CapMachine.Wpf
             containerRegistry.RegisterSingleton<MachineRtDataService>();
             containerRegistry.RegisterSingleton<DataRecordService>();
             containerRegistry.RegisterSingleton<HighSpeedDataService>();
-            //containerRegistry.RegisterSingleton<PPCService>();
+            containerRegistry.RegisterSingleton<PPCService>();
             containerRegistry.RegisterSingleton<SysRunService>();
 
             containerRegistry.RegisterSingleton<ComActionService>();
diff --git a/CapMachine.Wpf/CapMachine.Wpf.csproj b/CapMachine.Wpf/CapMachine.Wpf.csproj
index 98c763e..f053d38 100644
--- a/CapMachine.Wpf/CapMachine.Wpf.csproj
+++ b/CapMachine.Wpf/CapMachine.Wpf.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <OutputType>WinExe</OutputType>
+    <OutputType>Exe</OutputType>
     <TargetFramework>net6.0-windows</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
diff --git a/CapMachine.Wpf/Services/PPCService.cs b/CapMachine.Wpf/Services/PPCService.cs
index 1a11fcf..b5551f5 100644
--- a/CapMachine.Wpf/Services/PPCService.cs
+++ b/CapMachine.Wpf/Services/PPCService.cs
@@ -24,6 +24,7 @@ namespace CapMachine.Wpf.Services
         /// 计算扫描 Task
         /// </summary>
         private static Task CalcTask { get; set; }
+        private static int _scanLoopStarted;
         public ConfigService ConfigService { get; }
 
         private IEventAggregator _EventAggregator { get; set; }
@@ -266,6 +267,11 @@ namespace CapMachine.Wpf.Services
         /// </summary>
         private void RtScanDeviceStart()
         {
+            if (System.Threading.Interlocked.CompareExchange(ref _scanLoopStarted, 1, 0) != 0)
+            {
+                return;
+            }
+
             CalcTask = Task.Run(async () =>
             {
                 while (RtCalcEnable)
@@ -332,7 +338,7 @@ namespace CapMachine.Wpf.Services
             }
             else if (_superheatSubcoolCalculator.TryCalculateSuperheatK(InhPressTag.EngPvValue, InhTempTag.EngPvValue, out var superheatValue, out var superheatErr))
             {
-                Superheat.EngPvValue = superheatValue;
+                Superheat.EngPvValue =Math.Abs(superheatValue) ;
                 updated = true;
             }
             else
@@ -348,7 +354,7 @@ namespace CapMachine.Wpf.Services
             }
             else if (_superheatSubcoolCalculator.TryCalculateSubcoolK(TxvFrPressTag.EngPvValue, TxvFrTempTag.EngPvValue, out var subcoolValue, out var subcoolErr))
             {
-                Subcool.EngPvValue = subcoolValue;
+                Subcool.EngPvValue = Math.Abs(subcoolValue);
                 updated = true;
             }
             else
diff --git a/CapMachine.Wpf/Services/PPCSuperheatSubcoolCalculationInput.cs b/CapMachine.Wpf/Services/PPCSuperheatSubcoolCalculationInput.cs
index c09b666..8dfd8d0 100644
--- a/CapMachine.Wpf/Services/PPCSuperheatSubcoolCalculationInput.cs
+++ b/CapMachine.Wpf/Services/PPCSuperheatSubcoolCalculationInput.cs
@@ -239,7 +239,7 @@ namespace CapMachine.Wpf.Services
         /// </remarks>
         private sealed class LocalCalculationSupport : IPPCCalculationSupport
         {
-            private static readonly object _refpropLock = new object();
+            private static readonly object _refpropLock = RefpropGlobalSync.SyncRoot;
             private static volatile bool _rpInitialized;
 
             public bool EnsureRefpropInitialized(out string error)
diff --git a/CapMachine.Wpf/Services/PPCThermodynamicSixResultsCalculationInput.cs b/CapMachine.Wpf/Services/PPCThermodynamicSixResultsCalculationInput.cs
index ffe7411..0352b9f 100644
--- a/CapMachine.Wpf/Services/PPCThermodynamicSixResultsCalculationInput.cs
+++ b/CapMachine.Wpf/Services/PPCThermodynamicSixResultsCalculationInput.cs
@@ -1064,7 +1064,7 @@ namespace CapMachine.Wpf.Services
         /// </remarks>
         private sealed class LocalCalculationSupport : IPPCCalculationSupport
         {
-            private static readonly object _refpropLock = new object();
+            private static readonly object _refpropLock = RefpropGlobalSync.SyncRoot;
             private static volatile bool _rpInitialized;
 
             public bool EnsureRefpropInitialized(out string error)
diff --git a/CapMachine.Wpf/Services/RefpropGlobalSync.cs b/CapMachine.Wpf/Services/RefpropGlobalSync.cs
new file mode 100644
index 0000000..aa055a0
--- /dev/null
+++ b/CapMachine.Wpf/Services/RefpropGlobalSync.cs
@@ -0,0 +1,17 @@
+namespace CapMachine.Wpf.Services
+{
+    /// <summary>
+    /// REFPROP 全局同步对象。
+    /// </summary>
+    /// <remarks>
+    /// REFPROP 不是线程安全组件，所有底层 DLL 调用必须串行进入。
+    /// 该类提供进程内统一锁，供不同计算器共享，避免并发调用导致的瞬时异常结果。
+    /// </remarks>
+    internal static class RefpropGlobalSync
+    {
+        /// <summary>
+        /// REFPROP 全局互斥锁。
+        /// </summary>
+        internal static readonly object SyncRoot = new object();
+    }
+}