500-72203-001 Rev. H Page 4 of 15
L722 OPERATION
To connect a probe to the L622, remove the dust plug from the beige-colored port
labeled “PROBE” on the meter and plug the connecting cable into this port.
With the probe connected to the L622 and the meter ON, insert the probe into the
sticker space between the layers of boards in a stack of lumber. The springs press
the end-mounted sensor flat against the wood. The actual sensing area of the probe
is located in the end of the probe assembly on the opposite side of the springs. Be
sure to insert and remove the probe straight in and straight out of the stack of lumber
to avoid damage to the L722 springs and hinge.
When the probe is connected to the meter, the internal hand-meter sensor is
bypassed and the probe will be the source of the readings. The backlight will also be
turned on automatically for easier viewing in the dark kiln environment.
MAINTAINING ACCURACY OF MOISTURE CONTENT READINGS
The purpose of this section is to provide proper moisture content measurement
techniques during kiln drying operations. The major factor of preserving consistent
readings is to control the many variables that are present when moisture content
(MC) values are measured. The control of these variables will be identified and
addressed in the following paragraphs.
Taking L722 Stack Probe Measurements – The probe should be checked
for proper calibration prior to use. This can be accomplished by verifying the stack
probe on the calibration block. The L622 meter should be checked for general
operation and battery condition. Ensure the L622 meter has been selected for the
appropriate wood species being measured. Verify a good connection with the coil
cord at the meter by making sure the moisture content value doesn’t drift while
wiggling the cable.
Consistent use of the stack probe will maintain the integrity of MC readings. Ensure
the sensor plate area is completely covered by the lumber being measured. Take
several measurements with the probe oriented along the length of the board,
measure close to the “stickers” as wood surfaces will be more uniform at these
locations.
Don’t pull down on the probe handle because hinge damage may occur.
The kiln drying operations procedure should spell out the specific number of
measurements to take, at what depth in the stack to measure, and when to measure
them in the drying cycle. In order to maintain consistency, take readings in the same
locations in the stack, and at the same times in the drying cycle from one kiln charge
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