1. Introduction
Thank you for your purchase of the InstroTek/CPN Model 503
Elite Hydroprobe. The Model CPN 503 Elite HYDROPROBE,
NEUTRON MOISTURE PROBE, measures the sub-surface moisture
in soil and other materials by use of a probe containing a
source of high-energy neutrons and a slow (thermal) neutron
detector. The probe is lowered into a pre-drilled and cased
hole that’s either 1.5 or 2 inches in diameter.
The source used in this gauge emits fast neutrons. Fast
neutrons from the source interact with Hydrogen in water and
thermalize (slow down) neutrons. The thermal or slow neutrons
are then counted by the He3 tube. Increase in water content
results in a proportional increase in thermal neutron counts
detected by the tube. The moisture data is displayed directly
in units of interest on the electronic assembly which is
connected to the source shield assembly.
This state-of-the-art instrument offers a simple to operate but
superior alternative to other methods of soil moisture
monitoring. The operator needs minimal instructions.
The probe is supplied with an 8 foot cable and ten adjustable
cable stops. Additional stops and longer cable lengths are
available upon request.
Upon retraction of the probe into the shield, the probe latches
automatically in place and must be locked during
transportation.
The complete assembly is supplied with a shipping and
carrying container which contains accessory items, cable,
operating manual, and other materials which the operator
may wish to carry.
