19
Wet Bulb Sensor
This sensor measures the wet bulb temperature
(WBT). The sensor equipped with a water wick
will be cooled through evaporation bringing its
temperature reading below that of the dry bulb.
This lower temperature is the WBT, it is the lowest
temperature that can be reached inside of the kiln,
through the evaporation of water, under the current
ambient conditions. You can set the desired WBT
from the kiln controller as well. This setting controls
the kiln compressor and spray system which will be
automatically adjusted to accommodate the desir ed
WBT.
Example: If the WBT falls below the set parameter
the system will turn on the spray system. Or if the
WBT rises above the set parameter the system will
turn on the compressor.
Note: Spray system is not included with your unit. See
the upgrades and accessories section on page 39
Wet Bulb & Dry Bulb Installation
Use Wet Bulb/ Dry Bulb template on page 41 to
mark where all components go.
Step 1: Mount an 8” x 10” piece of wood on the kiln
wall at a convenient height, roughly 4 feet (1.2m) off
the floor and 3 feet (.92 m) from the unit so that it is
receiving air flow from the circulating fans.
Step 2: install Wet Bulb & Dry Bulb brackets & sensors
Step 3: Install Wet Bulb bottle
Step 4: Put approximately 5 ft of the wick material
in the bottle, looping it through the opening of the
bottle.
Step 5: Slide 2” (50mm) of the wick into the sensor.
Step 6: Fill the bottle with filtered water.
Note: Over time the wick material will become
rough and unable to hold moisture. When this
happens cut off a nd d iscard t he d amaged m aterial
and pull more wick out of the bottle.
WARNING: The wick surrounding the wet bulb must
be maintained and always wet. The wet bulb must be
positioned close to the dry bulb, in a position where it
can still receive the airow. If these conditions are not
satised, the control could mis-regulate the kiln over
drying and damaging the wood.
Kiln Control
Attention: Before continuing please determine
which controller you will be using.
How the Controller Works
With the KD250 Controller the user only needs to
set the required temperature values for wet and
dry bulb and the controller will automatically
manage the kiln heater, compressor, power
vents (and optional spray system) in order to
reach the requested settings for the kiln climate.
Use the difference between DBT a nd W BT to fi nd
the relative humidity (RH) and EMC of the air, using
the tables on pg 32.
The KD250 gives four different measuring
points, using four timber probes that are
connected to the lumber samples. (See page 21 for
more information)
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