diff --git a/app/src/main/java/com/yinuo/safetywatcher/watcher/port/ParseHelper.kt b/app/src/main/java/com/yinuo/safetywatcher/watcher/port/ParseHelper.kt
index 1a0a03b..df8ee66 100644
--- a/app/src/main/java/com/yinuo/safetywatcher/watcher/port/ParseHelper.kt
+++ b/app/src/main/java/com/yinuo/safetywatcher/watcher/port/ParseHelper.kt
@@ -311,6 +311,9 @@ object ParseHelper {
      * @return 修正后的值
      */
     private fun correctValueByOtherGas(type: GasTypeEnum, oriValue: Float): Float {
+        if (oriValue <= 0f) {
+            return oriValue
+        }
         var offset = 0f
         if (unConvertValueMap.isNotEmpty()) {
             unConvertValueMap.forEach { entry ->