Campbell Scientific HS2 and HS2P (HydroSense II) - Manual (Page 32)

HS2 and HS2P
3. Lift the display from its holder.
11.3 Rod Replacement
Threaded inserts in the epoxy body of the sensors allow user replacement of
the stainless steel rods. Initially, these rods are fitted at the factory and with
normal use should provide years of trouble-free service.
Insertion into rocky soils can lead to bending of the rods. Bent rods should be
straightened or replaced as soon as possible since non-parallel rods can
introduce error and lead to more serious bending or breaking. Small bends can
often be straightened by hand, but more serious bends may require rod
replacement. Spare rods can be purchased from Campbell Scientific.
• Spare 20 cm rods (pn 26483) for the CS658or CS658P sensor
• Spare 12 cm rods (pn 10184) for the CS659 or CS659P sensor.
Unlike the original HydroSense, the HydroSense II sensors do not
support interchangeable rods. The CS658 and CS658P will only
measure accurately with 20 cm rods and the CS659 and CS659P
will only measure accurately with 12 cm rods. Threads have been
mismatched intentionally to ensure that rods are not inadvertently
mixed up. Please do not attempt to change rod sizes.
The rods have a hexagonal nut collar. When threaded into the sensor body, this
collar distributes lateral forces over a relatively large area to reduce rod
deformation.
NOTE
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