diff --git a/api/sensor.py b/api/sensor.py
index 33dbe5c97..92360a4d1 100644
--- a/api/sensor.py
+++ b/api/sensor.py
@@ -26,7 +26,7 @@
     editor_dependency,
     viewer_dependency,
 )
-from db import Observation, Sample, Sensor
+from db import Observation, Sensor, Deployment, Thing
 from schemas.sensor import SensorResponse, CreateSensor, UpdateSensor
 from services.crud_helper import model_patcher, model_deleter, model_adder
 from services.exceptions_helper import PydanticStyleException
@@ -138,22 +138,23 @@ async def get_sensors(
     This endpoint is a placeholder and should be implemented with actual logic.
     """
     sql = select(Sensor)
-    # TODO: a sensor is not yet related to observation, so this won't work at the moment
     if thing_id is not None or observed_property is not None:
         conditions = []
         joins = []
         if observed_property is not None:
+            joins.append(Observation)
             conditions.append(Observation.observed_property == observed_property)
 
         if thing_id is not None:
-            joins.append(Sample)
-            conditions.append(Sample.thing_id == thing_id)
+            joins.append(Deployment)
+            joins.append(Thing)
+            conditions.append(Thing.id == thing_id)
 
-        if conditions:
-            sql = sql.join(Observation)
+        if joins:
             for j in joins:
                 sql = sql.join(j)
 
+        if conditions:
             sql = sql.where(and_(*conditions))
 
     sql = order_sort_filter(sql, Sensor, sort=sort, order=order, filter_=filter_)
diff --git a/core/lexicon.json b/core/lexicon.json
index 41826dcb4..14d2a1828 100644
--- a/core/lexicon.json
+++ b/core/lexicon.json
@@ -114,6 +114,9 @@
   {"categories": [{"name": "unit", "description": null}], "term": "deg C", "definition": "degree Celsius"},
   {"categories": [{"name": "unit", "description": null}], "term": "deg second", "definition": "degree second"},
   {"categories": [{"name": "unit", "description": null}], "term": "deg minute", "definition": "degree minute"},
+  {"categories": [{"name": "unit", "description": null}], "term": "second", "definition": "second"},
+  {"categories": [{"name": "unit", "description": null}], "term": "minute", "definition": "minute"},
+  {"categories": [{"name": "unit", "description": null}], "term": "hour", "definition": "hour"},
 
   {"categories": [{"name": "observed_property", "description": null}], "term": "groundwater level", "definition": "groundwater level measurement" },
   {"categories": [{"name": "observed_property", "description": null}], "term": "temperature", "definition": "Temperature measurement"},
diff --git a/tests/conftest.py b/tests/conftest.py
index 250754c0a..fe0fe8f87 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -219,6 +219,26 @@ def second_sensor():
         session.commit()
 
 
+@pytest.fixture(scope="session")
+def sensor_to_water_well_thing_deployment(sensor, water_well_thing):
+    with session_ctx() as session:
+        deployment = Deployment(
+            sensor_id=sensor.id,
+            thing_id=water_well_thing.id,
+            installation_date="2023-01-01",
+            removal_date=None,
+            recording_interval=24,
+            recording_interval_units="hour",
+            hanging_cable_length=10,
+            hanging_point_height=0,
+            hanging_point_description="hang 10",
+            notes="deployment fixture",
+        )
+        session.add(deployment)
+        session.commit()
+        yield deployment
+
+
 @pytest.fixture(scope="session")
 def contact(water_well_thing):
     with session_ctx() as session:
diff --git a/tests/test_sensor.py b/tests/test_sensor.py
index 0c9e5aab9..4ff87c80f 100644
--- a/tests/test_sensor.py
+++ b/tests/test_sensor.py
@@ -161,6 +161,29 @@ def test_get_sensors(sensor):
     assert data["items"][0]["notes"] == sensor.notes
 
 
+def test_get_sensors_by_thing_id(
+    sensor,
+    sensor_to_water_well_thing_deployment,
+    water_well_thing,
+):
+    response = client.get(f"/sensor?thing_id={water_well_thing.id}")
+    assert response.status_code == 200
+    data = response.json()
+    assert data["total"] == 1
+    assert data["items"][0]["id"] == sensor.id
+    assert data["items"][0]["created_at"] == sensor.created_at.isoformat().replace(
+        "+00:00", "Z"
+    )
+    assert data["items"][0]["release_status"] == sensor.release_status
+    assert data["items"][0]["name"] == sensor.name
+    assert data["items"][0]["model"] == sensor.model
+    assert data["items"][0]["serial_no"] == sensor.serial_no
+    assert data["items"][0]["datetime_installed"] == sensor.datetime_installed
+    assert data["items"][0]["datetime_removed"] == sensor.datetime_removed
+    assert data["items"][0]["recording_interval"] == sensor.recording_interval
+    assert data["items"][0]["notes"] == sensor.notes
+
+
 def test_get_sensor_by_id(sensor):
     response = client.get(f"/sensor/{sensor.id}")
     assert response.status_code == 200