Campbell Scientific Sentek EnviroSCAN Access Tube Installation Guide - Manual (Page 34)

Installing EnviroSCAN, EnviroSM ART & Diviner 2000 access tubes
© Sent ek Pt y Lt d Page 31
5. Insert the assembled auger into the tripod ensuring the centralization poly guide is fitted to
the top of the tripod cylinder.
6. Turn the auger 4-5 turns and lift it gently approximately five centimetres, then turn the auger
another 3-4 turns. The lifting action moves the soil upward, partially filling the space around
the auger head and providing a greater uptake for additional soil. Note: Do not try to auger
too much soil at one time, as the auger may over-fill with soil, making it difficult to remove
from the hole.
7. Clean the auger head and repeat the process to the required depth of installation.
8. When augering is complete, check the final depth with a measuring tape to ensure that you
have enough depth for your tube length. To position the middle of the first sensor at 10 cm
below the ground surface, ensure that 4 cm of access tube is protruding above the ground.
9. Ensure the yellow metal cutting edge is fitted squarely onto the access tube.
10. Place the access tube fitted with cutting edge in the tripod guide and insert the heavy duty
dolly into the top of the access tube.
11. To prevent the access tube from flexing, attach extension rods to the Heavy Duty Dolly,
ensuring they are firmly tightened.
12. Drive the access tube into the ground using the sledge hammer. If the driving of the access
tube becomes too strenuous, use the 47 mm regular auger to clean out the soil shavings
repeatedly from the inside of the access tube. Continue hammering until you have reached
the final depth.
Dry and heavy clay soil
For dry and heavy clay soils the Dry Clay 56.0 mm auger (available from Sentek as an accessory item) is
used as it cuts only 0.5 mm smaller than the outside diameter of the access tube. This reduces the friction
when driving into the access tube. The red cutting edge with a longer neck is used for better stabilization.
To install access tubes into dry and heavy clay soils
1. Ensure the tripod is set up correctly and centred over the access tube installation site.
2. Select the Dry Clay 56.0 mm auger and the required extension rods. Attach the auger head
to the extension rods.