METER APOGEE SU-221, Manual

4

USING APOGEE UV SENSORS WITH ZENTRA SYSTEM

2.1  SET UP MOUNTING ASSEMBLY

Apogee UV sensors must be level to accurately measure UV irradiance incident on a 
horizontal surface. Each Apogee UV sensor purchased from METER comes with an 
AL-120 Solar Mounting Bracket with Leveling Plate. The AL-120 can be mounted to either a 
horizontal or vertical post, depending on which set of holes is used.
1.  Align the cable M8 connector pins with the sensor M8 connector holes and seat 

connectors fully.

2.  Tighten the cable screw until hand-tight (

Figure 1

).

M8 connectors are easy to overtighten. Do not use pliers or other tools to tighten 
this connector.

Cable screw

Figure 1  Attach M8 connector

3.  Mount the sensor to the leveling plate (

Figure 2

) with the included nylon screw.

\

Mounting bracket 
(AL-120)

Sensor
(SU-221)

Leveling plate

U-bolt

Figure 2  Apogee UV sensor installed on mast or pipe

4.  Attach the leveling plate to the mounting bracket using the included three machine screws. 
5.  Attach the mounting bracket either to a horizontal arm (

Figure 2

) or vertical post using 

the included U-bolt.