T&D TR-74Ui Introductory Manual page 16

Illuminance-UV Sensor (ISA-3151)
23
12.6
Illuminance Sensor Area
Temperature-Humidity Sensor (THA-3151)
18
10
Temperature-Humidity Sensor Area
Temperature-Humidity Sensor (HHA-3151)
20
10
Temperature-Humidity Sensor Area
16
65
51.5
64.5
1500
Ultraviolet Sensor Area
1500
φ 2 .6
1500
φ 2 .6
26.5
φ 2 .6
unit : millimeters
26.5
unit : millimeters
26.5
unit : millimeters