diff --git a/src/pms/sensors/plantower/pmsx003.py b/src/pms/sensors/plantower/pmsx003.py
index f37d0a5..5f80de6 100644
--- a/src/pms/sensors/plantower/pmsx003.py
+++ b/src/pms/sensors/plantower/pmsx003.py
@@ -13,6 +13,7 @@
 
 ALIASES = ("PMS1003", "G1", "PMS5003", "G5", "PMS7003", "G7", "PMSA003", "G10")
 
+PREHEAT = 10  # 10 seconds
 
 commands = base.Commands(
     passive_read=base.Cmd(b"\x42\x4D\xE2\x00\x00\x01\x71", b"\x42\x4D\x00\x1c", 32),
diff --git a/tests/core/test_reader.py b/tests/core/test_reader.py
index 429ac71..0ccc455 100644
--- a/tests/core/test_reader.py
+++ b/tests/core/test_reader.py
@@ -158,6 +158,8 @@ def factory(
             lambda: None,
         )
 
+        sensor_reader.pre_heat = 0  # disable any preheat
+
         return sensor_reader
 
     return factory
diff --git a/tests/sensors/test_sensor.py b/tests/sensors/test_sensor.py
index 4830158..0963182 100644
--- a/tests/sensors/test_sensor.py
+++ b/tests/sensors/test_sensor.py
@@ -29,7 +29,12 @@ def test_baud(sensor):
 
 @pytest.mark.parametrize("sensor", Supported)
 def test_pre_heat(sensor):
-    pre_heat = 0 if sensor != "MHZ19B" else 180
+    if sensor == "MHZ19B":
+        pre_heat = 180
+    elif sensor == "PMSx003":
+        pre_heat = 10
+    else:
+        pre_heat = 0
     assert Sensor[sensor].pre_heat == pre_heat