1
237 Leaf Wetness Sensor
1. Introduction
The 237 Leaf Wetness Sensor measures leaf wetness by determining the
electrical resistance on the surface of the sensor (a wet surface is less resistant).
It is primarily used to determine the percentage of time that a leaf surface is
wet, versus the time it is dry.
This manual provides information only for CRBasic dataloggers.
For Edlog datalogger support, see an older manual at
www.campbellsci.com/old-manuals
2. Precautions
•
front
of this
manual.
•
Although the 237 is rugged, it is also a highly precise scientific instrument
and should be handled as such.
•
The 237 is designed for short duration ac excitation; dc excitation or
continuous ac excitation may damage the sensing grid.
•
The black outer jacket of the cable is Santoprene® rubber. This compound
was chosen for its resistance to temperature extremes, moisture, and UV
degradation. However, this jacket will support combustion in air. It is rated
as slow burning when tested according to U.L. 94 H.B. and will pass
FMVSS302. Local fire codes may preclude its use inside buildings.
3. Initial Inspection
•
Upon receipt of the 237, inspect the packaging for any signs of shipping
damage and, if found, report the damage to the carrier in accordance with
policy. The contents of the package should also be inspected and a claim
filed if any shipping related damage is discovered.
•
The model number is printed on a label at the connection end of the cable.
Check this information against the shipping documents to ensure the
correct product is received.
4. QuickStart
Short Cut
is an easy way to program your datalogger to measure the 237 and
assign datalogger wiring terminals.
Short Cut
is available as a download on
. It is included in installations of
LoggerNet
,
RTDAQ
,
PC400
,
or
PC200W
.
NOTE
