diff --git a/bricksrc/definitions.csv b/bricksrc/definitions.csv
index 09750aea..ce827667 100644
--- a/bricksrc/definitions.csv
+++ b/bricksrc/definitions.csv
@@ -136,6 +136,7 @@ https://brickschema.org/schema/Brick#Chilled_Water_Differential_Pressure_Step_Pa
 https://brickschema.org/schema/Brick#Chilled_Water_Differential_Temperature_Sensor,Measures the difference in temperature between the entering water to the chiller or other water cooling device and leaving water from the same chiller or other water cooling device,
 https://brickschema.org/schema/Brick#Chilled_Water_Flow_Sensor,Measures the rate of flow in a chilled water circuit,
 https://brickschema.org/schema/Brick#Chilled_Water_Flow_Setpoint,Sets the target flow rate of chilled water,
+https://brickschema.org/schema/Brick#Chilled_Water_Gauge_Pressure_Sensor,Sensor measuring the gauge pressure (zero-referenced against ambient air pressure) of chilled water,
 https://brickschema.org/schema/Brick#Chilled_Water_Loop,A collection of equipment that transport and regulate chilled water among each other,
 https://brickschema.org/schema/Brick#Chilled_Water_Meter,A meter that measures the usage or consumption of chilled water,
 https://brickschema.org/schema/Brick#Chilled_Water_Pump,A pump that performs work on chilled water; typically part of a chilled water system,
@@ -489,6 +490,7 @@ https://brickschema.org/schema/Brick#Gas_Pressure_Regulator_Valve,Valve designed
 https://brickschema.org/schema/Brick#Gas_Sensor,Measures gas concentration (other than CO2),
 https://brickschema.org/schema/Brick#Gasoline,Petroleum derived liquid used as a fuel source,
 https://brickschema.org/schema/Brick#Gatehouse,The standalone building used to manage the entrance to a campus or building grounds,
+https://brickschema.org/schema/Brick#Gauge_Pressure_Sensor,Pressure sensor which is zero-referenced against ambient air pressure,
 https://brickschema.org/schema/Brick#Generation_Sensor,A sensor measuring how much something has been generated.,
 https://brickschema.org/schema/Brick#Generator_Room,"A room for electrical equipment, specifically electrical generators.",
 https://brickschema.org/schema/Brick#Grains,,
@@ -557,6 +559,7 @@ https://brickschema.org/schema/Brick#Hot_Water_Differential_Temperature_Sensor,M
 https://brickschema.org/schema/Brick#Hot_Water_Discharge_Temperature_Load_Shed_Status,,
 https://brickschema.org/schema/Brick#Hot_Water_Flow_Sensor,Measures the rate of flow in a hot water circuit,
 https://brickschema.org/schema/Brick#Hot_Water_Flow_Setpoint,Sets the target flow rate of hot water,
+https://brickschema.org/schema/Brick#Hot_Water_Gauge_Pressure_Sensor,Sensor measuring the gauge pressure (zero-referenced against ambient air pressure) of hot water,
 https://brickschema.org/schema/Brick#Hot_Water_Loop,A collection of equipment that transport and regulate hot water among each other,
 https://brickschema.org/schema/Brick#Hot_Water_Meter,A meter that measures the usage or consumption of hot water,
 https://brickschema.org/schema/Brick#Hot_Water_Pump,A pump that performs work on hot water; typically part of a hot water system,
diff --git a/bricksrc/quantities.py b/bricksrc/quantities.py
index 05e8d4a4..527216c8 100644
--- a/bricksrc/quantities.py
+++ b/bricksrc/quantities.py
@@ -548,6 +548,18 @@ def all_units():
                     },
                 },
             },
+            "Gauge_Pressure": {
+                QUDT.applicableUnit: [
+                    UNIT["IN_H2O"],
+                    UNIT["LB_F-PER-IN2"],
+                    UNIT["MilliM_H2O"],
+                    UNIT["BAR"],
+                ],
+                SKOS.definition: Literal("Pressure relative to atmospheric pressure"),
+                RDFS.isDefinedBy: URIRef(str(BRICK).strip("#")),
+                RDFS.label: Literal("Gauge_Pressure"),
+                SKOS.broader: QUDTQK.Pressure,
+            },
             "Static_Pressure": {
                 BRICK.hasQUDTReference: QUDTQK["StaticPressure"],
                 SKOS.narrower: {
diff --git a/bricksrc/sensor.py b/bricksrc/sensor.py
index a77dc1bd..1555558f 100644
--- a/bricksrc/sensor.py
+++ b/bricksrc/sensor.py
@@ -680,6 +680,10 @@
                                     TAG.Discharge,
                                 ],
                                 BRICK.hasQuantity: QUDTQK.VolumeFlowRate,
+                                BRICK.hasSubstance: [
+                                    BRICK.Supply_Air,
+                                    BRICK.Discharge_Air,
+                                ],
                                 "aliases": [BRICK["Discharge_Air_Flow_Sensor"]],
                                 "subclasses": {
                                     "Average_Supply_Air_Flow_Sensor": {
@@ -955,6 +959,10 @@
                                 ],
                                 "aliases": [BRICK["Discharge_Air_Humidity_Sensor"]],
                                 BRICK.hasQuantity: QUDTQK.RelativeHumidity,
+                                BRICK.hasSubstance: [
+                                    BRICK.Supply_Air,
+                                    BRICK.Discharge_Air,
+                                ],
                             },
                             "Zone_Air_Humidity_Sensor": {
                                 "tags": [
@@ -1034,6 +1042,32 @@
                 "tags": [TAG.Point, TAG.Sensor, TAG.Pressure],
                 BRICK.hasQuantity: BRICK.Pressure,
                 "subclasses": {
+                    "Gauge_Pressure_Sensor": {
+                        "tags": [TAG.Point, TAG.Sensor, TAG.Pressure, TAG.Gauge],
+                        BRICK.hasQuantity: BRICK.Gauge_Pressure,
+                        "subclasses": {
+                            "Chilled_Water_Gauge_Pressure_Sensor": {
+                                "tags": [
+                                    TAG.Point,
+                                    TAG.Sensor,
+                                    TAG.Chilled,
+                                    TAG.Water,
+                                    TAG.Gauge,
+                                    TAG.Pressure,
+                                ],
+                            },
+                            "Hot_Water_Gauge_Pressure_Sensor": {
+                                "tags": [
+                                    TAG.Point,
+                                    TAG.Sensor,
+                                    TAG.Hot,
+                                    TAG.Water,
+                                    TAG.Gauge,
+                                    TAG.Pressure,
+                                ],
+                            },
+                        },
+                    },
                     "Air_Pressure_Sensor": {
                         "tags": [TAG.Point, TAG.Sensor, TAG.Pressure, TAG.Air],
                         BRICK.hasSubstance: BRICK.Air,
diff --git a/tests/test_deprecation.py b/tests/test_deprecation.py
index a1c6b7fe..c35d18c7 100644
--- a/tests/test_deprecation.py
+++ b/tests/test_deprecation.py
@@ -35,4 +35,4 @@ def test_deprecation(brick_with_imports):
         ?res sh:value <urn:ex#fan> .
     }"""
     )
-    assert len(list(res)) == 1, "Should have a warning for deprecation"
+    assert len(set(res)) == 1, "Should have a warning for deprecation"