diff --git a/intc-modules/intc-iot/src/main/java/com/intc/iot/handler/DeviceDataHandler.java b/intc-modules/intc-iot/src/main/java/com/intc/iot/handler/DeviceDataHandler.java
index 5495449..6f599ab 100644
--- a/intc-modules/intc-iot/src/main/java/com/intc/iot/handler/DeviceDataHandler.java
+++ b/intc-modules/intc-iot/src/main/java/com/intc/iot/handler/DeviceDataHandler.java
@@ -986,6 +986,12 @@ public class DeviceDataHandler {
                 return;
             }
 
+            // 设备已过期，不触发告警
+            if (device.getDeadTime() != null && device.getDeadTime().before(new java.util.Date())) {
+                log.debug("[离线告警] 设备已过期，跳过: {}", deviceName);
+                return;
+            }
+
             Long deviceId = device.getId();
             Long userId = device.getUserId();
 
@@ -1254,6 +1260,12 @@ public class DeviceDataHandler {
                 return;
             }
 
+            // 设备已过期，不触发告警
+            if (device.getDeadTime() != null && device.getDeadTime().before(new java.util.Date())) {
+                log.debug("[饱和度告警] 设备已过期，跳过: {}", deviceName);
+                return;
+            }
+
             Long deviceId = device.getId();
             Long userId = device.getUserId();
 
@@ -2000,18 +2012,17 @@ public class DeviceDataHandler {
             if (!params.containsKey("sensorErrorCode")) {
                 return;
             }
-            // 字段存在但为空字符串时，视为无故障（0），清除探头相关告警位
+            // 字段存在但值为空/null时，说明设备未真正上报该字段，直接跳过（不能视为0）
             Object rawValue = params.get("sensorErrorCode");
-            int sensorErrorCode;
             if (rawValue == null || "".equals(rawValue.toString().trim())) {
-                sensorErrorCode = 0;
-            } else {
-                Integer parsed = params.getInt("sensorErrorCode");
-                if (parsed == null) {
-                    return;
-                }
-                sensorErrorCode = parsed;
+                log.debug("[探头错误码] sensorErrorCode为空值，跳过处理: {}", deviceName);
+                return;
             }
+            Integer parsed = params.getInt("sensorErrorCode");
+            if (parsed == null) {
+                return;
+            }
+            int sensorErrorCode = parsed;
 
             // 查询设备，需要 id / warnCode / isOxygenUsed / pondId / deadTime
             Device device = deviceMapper.selectOne(