Hobo WELL-CAP-02 Installation Instructions Download Page 1

Well Cap Installation Instructions (WELL-CAP-02) 

For use with a HOBO® MicroRX Water Level Station (RX2103 or RX2104) or Water Level Sensor Module (RXMOD-W1) 

23988-B MAN-WELL-CAP-02 

Before you Begin 

Follow these instructions 

before

 deploying the water level sensor with a station or in a well. If the 

sensor has already been installed in a well, remove it before continuing. 

Attaching the Well Cap to a Well 

This cap can be installed on a standard 5 cm (2 inch) pipe, metal or PVC, without glue as shown 
at right. It also fits on most threaded 5 cm (2 inch) pipes. If the cap is too loose once installed on 
a threaded pipe, add a small piece of connector pipe that has both a threaded end and a smooth 
end. Attach the threaded end of the connector pipe to the threaded end of the original pipe, 
leaving the smooth end of the connector pipe at the top to attach the well cap. As an alternative 
to a connector pipe, you can add duct tape around the threaded portion so that the cap is snug 
when placed on the pipe. 

Place the closed well cap on the end of the well. Use a hammer or mallet to tap the well cap firmly 
in place. Attach a padlock to the latch if desired. 

Installing the Water Level Sensor in the Well Cap 

1.

 

Using the half of the disk with posts, thread the water level 

sensor cable under one post and over the other post as 
shown below. The station and sensor are shown as reference 
for proper cable routing around the posts. Adjust the 
positioning of the cable as necessary to ensure there is 
enough length to reach the mounted station outside the well 
while deploying the sensor to the desired depth inside the 
well. 

 

 

 

2.

 

Insert the posts (with the cable routed as shown) into the 

receptacles in the other half, forming one disk when 
connected. 

 

 

3.

 

Insert the two screws through the posts and use a Phillips-
head screwdriver to screw them into place. 

 

And then 
over the 
other post 

Thread the water 
level sensor cable 
under one post 

Two halves connected 
with proper cable routing 

Connect the 
two halves 

Install the screws 

Vent hole, 
0.318 cm 
(0.125 in) 

Optional: 
attach a 
padlock here, 
hole diameter 
is 1.02 cm  
(0.4 inch) 

Use a hammer on top 
of closed well cap to 
tap it firmly in place 

Opening for use 
with water level 
meter 

(RX2104 station 
shown as an example) 

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