Campbell Scientific EnviroSCAN Sentek Water Content Profile Probe - Manual (Page 35)

Appendix C. Access Tube Installation
5. Select Access Tube Cleaning Tool no. 3 — rag tool. Insert a clean cotton
cloth into the eyelet and saturate with denatured alcohol. Move this tool
up and down the access tube to clean off the final dirt residue from the
access tube.
6. After cleaning the tube, use a flashlight to inspect the inside of the access
tube. You should be able to see clean walls and the lip of the cutting edge
at the bottom.
C.1.4 Installing the Bottom Stopper Bung
The bottom stopper bung is installed after the access tube has been cleaned. To
install the bung:
1. Ensure access tube is clean.
2. Partially insert bung into access tube and hold it at the upper end so 75%
of the top rubber ring is within the access tube.
3. Tighten the wing nut to the point where there is enough friction on the
wall of the access tube to prevent the bung from turning in the tube while
the wing nut is tightened.
4. Attach the bung tightening tool and auger extension rod and use the
tommy bars to tighten it firmly to the extension rods.
5. Place the bung tightening tool over the wing nut and slowly push the bung
down the access tube. Allow air to escape until the bung rests on top of
the internal cutting edge on the inside of the tube.
6. Slowly turn t-handle until you feel resistance to turning when the bung is
sitting tight.
7. Twist tool clockwise quickly while pulling upwards. This will release the
spring on the tool from the wing nut and enable you to pull the tool out of
the access tube.
C.1.5 Installing the Top Cap
The top cap assembly is installed after the access tube has been cleaned and the
bottom stopper fitted. To install the top cap assembly follow these steps:
1. Ensure the 4 cm of the access tube protruding from the soil is clean on the
inside and the outside.
2. With a silicon gun and new nozzle, apply three rings of silicon around
outside of the access tube about 1 cm below the top rim of the tube.
3. Unscrew cap from top cap assembly base.
4. Take top cap base and push it onto the top of the access tube with a slight
forward and backward rotating motion until the bottom foot of the top cap
touches the undisturbed soil surface.
C-5