WAGNER L722 User manual

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WAGNER MODEL L722
STACK PROBE
OWNER’S MANUAL

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Copyright Notice
Wagner Model L722 “Stack Probe” Attachment Owner’s Manual
© Copyright 2017 Wagner Meters All Rights Reserved Worldwide. No part of this
publication may be reproduced, transmitted, transcribed, stored in a retrieval system,
or translated into any other language in any form by any means without the express
written permission of Wagner Meters.
Table of Contents
L722 STACK PROBE ATTACHMENT..................................................................3
L722 SPECIFICATIONS.......................................................................................3
L722 CALIBRATION.............................................................................................3
L722 OPERATION................................................................................................4
MAINTAINING ACCURACY OF MOISTURE CONTENT READINGS..................4
L722 MAINTENANCE...........................................................................................6
CLEANING............................................................................................................6
SPRING REPLACEMENT ....................................................................................7
HINGE REPAIR/REPLACEMENT.........................................................................8
STORAGE ............................................................................................................8
COIL CORD REPLACEMENT ..............................................................................9
REPAIR SERVICE..............................................................................................11
REPLACEMENT PARTS....................................................................................13
WARNINGS ........................................................................................................15

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L722 STACK PROBE ATTACHMENT
The Model L722 Stack Probe attachment, coupled with the L612 or L622 (latest
version) Digital Recording Moisture Meter makes it easy to reach deep into stickered
units of lumber and take accurate moisture readings without the danger of broken
pins. Wagner’s “Wood-Friendly” electromagnetic wave technology makes it possible
to take multiple readings throughout an entire stack in just minutes.
NOTE: The L722 will work with either the L612 or the L622, for the remainder of this
manual, the L622 will only be referenced.
Once the probe is inserted between the boards, the springs press the end-mounted
sensor flat against the wood and ensure deep penetration of the electro-magnetic
field. You then slide the probe slowly out of the stack, reading the moisture in each
board as the sensor passes over it. Virtually unaffected by surface moisture, the L722
gives consistent and reliable readings in or out of kilns.
Patents 5,488,312
5,486,815
5,402,076
L722 SPECIFICATIONS
Overall Size Incl. Handle: L722L- L 48in x W 6.0in x H 1.625 in (121.9cm x 15.2cm x 4.12cm)
L722S- L34in x W 6.0in x H 1.625 in (86.3cm x 15.2cm x 4.12cm)
Probe Reach: L722L- L 40.5in (102.8cm)
L722S- L 26.75in (67.9cm)
Extrusion and Sensor Head: 0.5in (12.7mm) thickness
Min/Max Sticker Range: 0.5in –0.9in (12.7mm – 22.9mm)
Scanning Area: 2.5in x 2.5in (6.35cm x 6.35cm)
Scanning Depth: 1.0in (2.54cm) minimum
Shipping Weight: L722L- 128 oz. (3.64kg)
L722S- 112 oz. (3.18kg)
L722 CALIBRATION
Calibration is factory set. Calibration may be checked by using the Calibration
Verification Block (included with the L622), and following the instructions in the L622
Manual. The probe calibration is verified in the same manner as the L622 (Refer to
the L622 Owner’s Manual).

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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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to the next. You should take enough readings to be statistically significant. The
more readings you take, the more accurate your “average” will be.
When taking measurements using a stack probe, you will be measuring the selected
locations in the stack as stated in your kiln drying operations procedure. This will be
the average moisture content of the scan area being measured directly under the
sensor plate.
Keep in mind that the scan area of the L722 stack probe is 2.5” square (6.35cm) by
1” deep (2.54cm). This varies greatly from an in-line system, which has a much
wider scan area (up to 12” square, 30.5cm), and deeper penetration. This will cause
a larger area to be “averaged” with an in-line system.
The L722 stack probe readings will read excessively high when measuring severely
knotted lumber due to higher density. Readings will be best when measured on a
clear, flat area on the wide face of the lumber that is free of defects. If there is
noticeable surface moisture, try not to measure at that spot until the moisture
dissipates, or skip the area completely. As the moisture disperses, the effect will be
minimized.
Kiln Drying, Moisture Gradients, and Temperature – Warm lumber tends
to lose moisture after it is removed from the kiln and it continues to dry. It can also
absorb moisture from the air in humid conditions during storage prior to planing. The
moisture content of kiln-dried lumber is typically higher in the center core and dryer
towards the ends and outer surfaces. Planing the dryer top and bottom sections of a
board will cause the MC value to be higher. Because it is difficult to control all of
these elements, it is best to try to maintain consistency in storage, and apply a
correction factor as discussed in the paragraph below.
Frozen lumber can affect the MC readings. Wagner Meters has found that if frozen
lumber has a moisture content value lower than 15%, the readings are accurate. If
the MC is higher than 15%, the actual reading obtained may be lower than the true
value.
In a good measurement process consistency, repeatability, and correlation are the
key factors. The goal is a better FINAL lumber product that meets your moisture
content and grade goals. The closer your final product is to your target MC, the more
cost efficient your drying process will be.
Here are some questions to ask yourself: Are all of your personnel taking the same
number of readings? Are the readings being taken at the same time in the kiln dry
schedule? Has my meter calibration been recently verified? Are the readings being
taken at the same location in the same packs every time? This is the key to
repeatability!
Applying Correction Factors - Due to variances beyond the control of the
user, the MC values obtained from kiln dried lumber as read from the Hand Meter

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/Stack Probe combination will likely not be exactly the same as read by an in-line
system. An effective method to compensate for this is to establish a correction factor
based on the nominal readings obtained in the kiln and the desired (target) MC
reading as seen at the console. You should be looking for a correlation between
the stack probe readings and the in-line readings.
Example: I measured packs 3, 7, 10 and 12 of 2x4 Douglas Fir in Kiln #1 by taking
50 readings in each pack after 20 hours of drying. I obtained a hot check average of
18%. I know the MC of this lumber going through the planer 3 days from now will
have a 16.5% average.
Use the stack probe MC as a reference and adjust your correction factor as
necessary to obtain the desired target MC at the in-line console. Compile data from
previous kiln cycles to fine-tune your correction factor.
Consistency is the key! If your process changes, consider the impact to your
correction factor, but do everything possible to control the variables. Don’t
complicate the variables by measuring one way this time and another way the next.
If your consistent correction factor suddenly stops working ask yourself: What has
changed? Were the hot check readings taken the same way? Did the lumber have
more MC variability going into the kiln? Did the meter recently get calibrated? Did
the pack coming out of the kiln go through the planer sooner or later than usual?
Temperature can also have a small effect on the readings. We now know that high
lumber temperatures can cause the MC reading to increase by 2-3%. These
variances are far smaller than would be seen with a resistive pin meter. Some of this
temperature related measurement error could be attributed to the warm lumber losing
moisture as it cools.
Try to measure the lumber at approximately the same temperature from one cycle to
the next to maintain the best consistency in your readings. If possible, let the wood
cool for a couple of hours prior to measurement. The temperature effect is small, and
correlation is the real goal, but more accuracy can be obtained by letting the
temperature stabilize.
L722 MAINTENANCE
CLEANING
Maintenance of the probe consists of cleaning the probe assembly periodically with
mild detergent cleaning solution and a soft rag. Do not soak or submerge the probe
in liquid. Scrape excess pitch off with a flat bladed instrument such as a chisel or
putty knife, being careful not to dig into the probe. Never use solvent of any kind for
cleaning.

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SPRING REPLACEMENT
When cleaning under the springs, remove the springs. NEVER lift up on the springs
this will distort the metal. If the springs should become damaged in any way replace
them in pairs. See Replacement Parts section for Part Numbers which may be
purchased from the factory or through your distributor.
Symbol Description
A REMOVE SCREWS.
REPLACE SPRINGS.
LABEL # 7 35-72 200 -00 1 REV. A
IMPORTANT!
CLEAN I NSTRUMENT DAILY.
NEVER USE SOLVENTOF ANY KI ND FOR CLEANING.
MAINTENANCE OFTHEPROBE CONSISTS OF CLEANINGTHE PROBE
ASSEMBLY PERIODICALLY WITHMILD DETERGENTCLEANING
SOLUTION AND A SOFT RAG.
SCRAPE EXCESS PITCH O FF WITHAFLAT BLADED INSTRUMENT
SUCH ASACHISEL OR PUTTYKNIFE, BEING CAREFULNOT TO DIG
INTO THE PROBE.
NEVER SOAK OR SUBMERGE
INSTRUMENT INANY LIQUID

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HINGE REPAIR/REPLACEMENT
If the hinge becomes stretched, removal of the hinge screws and reseating of the
hinge is all that is normally necessary. (Waiting for 30 minutes with the hinge
removed will allow the hinge material to relax). If the hinge is severely distorted, see
Replacement Parts section for Part Numbers which may be purchased from the
factory or through your distributor.
Symbol Description
A REMOVE HINGE SCREWS, AND RESEAT OR REPLACE HINGE.
STORAGE
The stack probe should be cleaned and stored in a cool dry environment.
LABEL # 7 35-72 200 -00 1 REV. A
IMPORTANT!
CLEAN I NSTRUMENT DAILY .
NEVER USE SOLVENTOF ANY KI ND FOR CLEANING.
MAINTENANCE OFTHEPROBE CONSISTS OF CLEANINGTHE PROBE
ASSEMBLY PERI ODICALLY WITHMILD DETERGENT CLEANING
SOLUTION AND A SOFT RAG.
SCRAPE EXCESS PITCH O FF WI TH AFLAT BLADED INSTRUMENT
SUCH ASACHISEL OR PUTTYKNIFE, BEING CAREFULNOT T O DI G
INTO THE PROBE.
NEVER SOAK OR SUBMERGE
INSTRUMENT INANY LIQUID

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COIL CORD REPLACEMENT
IF THE COIL CORD BECOMES DAMAGED,IT CAN BE REPLACED AS DESCRIBED
BELOW:
Step 1. Lay the L722 Stack Probe on a flat work space with the coil cord facing
upward. Remove the 6 screw fastening the handle half-shells together.
Separate the two halves of the handle.
Remove 6 Handle Screws
Step 2. Disconnect the old cord from the coupler.
Depress lever and extract plug from coupler.

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Step 3. Remove the old cord from the handle half-shell.
Rotate strain relief so latch is accessible then depress with screwdriver.
Step 4. Install replacement cord.
Reuse the strain relief from old cord and insert until latch clicks into hole.
Extend cord 3.75 inches into handle half with offset connector on outside.

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Step 5. Connect Replacement cord to coupler. Ensure latch clicks into detent.
Step 6. Carefully stow service loop and reassemble handle. See Step 1 for screw
locations.
REPAIR SERVICE
In the event of damage or failure, the Probe Head can be removed from the
extrusion.
You have the option of sending in your entire Stack Probe or the Stack Probe Head.
Your equipment will be repaired, calibrated, and returned promptly.

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NOTE: Shipping costs for a complete Stack Probe is more than twice the cost to ship
a Probe Head due to the “oversized” length shippers charge.
If you would like to expedite the Probe repair, a replacement Probe Head can be
ordered and shipped to you directly by Wagner, see Replacement Parts section for
Part Numbers which may be purchased from the factory or through your distributor.
Head removal is described below.
Step 1. Lay the L722 Stack Probe on a flat work space with the coil cord facing
upward. Remove the 6 screw fastening the handle half-shells together.
Separate the two halves of the handle.
Remove 6 Handle Screws
Step 2. Disconnect the old cord from the coupler.
Depress levers and extract plugs from coupler.

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Step 3. Loosen (2) inside extrusion screws, then remove (2) outside hinge dock
screws. Gently pull the Probe Head and its attached cable from the
extrusion.
Be sure to re-install Probe Head in reverse order.
REPLACEMENT PARTS
Several parts can be ordered for the L722 using the part numbers as follows:
Stock Number Description Purch Qty Purchasing Power
712-72206-001 Hinge, L722 1Buy 3 or more, 15% discount
714-72201-001 Spring, L722 10
714-72202-001 Spring, L722, Euro (32mm) 10
830-71202-001 Cord,Coiled, L712/L722 External 1Buy 3 or more, 15% discount
860-72202-001 Probe Head, Long Shaft 34", L722 1
860-72202-002 Probe Head, Short Shaft 20", L722 1
860-72202-003 Probe Head, Long Shaft 34", Euro, L722 1
860-72202-004 Probe Head, Short Shaft 20", Euro, L722 1
880-72202-001 Kit, L722 Parts, 1 Hinge, 4 Springs, screws 1Buy 2 get 10% discount, buy 3 or more, 15% discount
PLEASE VISIT WWW.WAGNERREPAIRS.COM AND FILL OUT THE
CORRESPONDING METER FORM AND SEND IT ALONG WITH YOUR STACK PROBE
OR PROBE HEAD TO WAGER METERS.ALL RETURN INFORMATION AND
PRICING IS ON THE FORM FOR YOUR CONVENIENCE.

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WARRANTY
Wagner Meters warrants this product against defects in material and workmanship
for one (1) year from the date of purchase, subject to the following terms and
conditions:
Wagner's liability under this warranty shall be limited, at Wagner's option, to the
repair or replacement of this product or any part thereof, which is demonstrated to be
defective. To exercise this warranty, the customer must phone, fax, or e-mail
Wagner’s Technical Service Department for an RMA (Return Materials Authorization)
number and factory instructions for shipment. This limited warranty does not apply if
accident, negligent handling, misuse, alteration, damage during shipment, or
improper service have damaged the product. Wagner Meters shall in no event be
liable for any breach of warranty or defect in this product, which exceeds the amount
of the purchase price of the product. Wagner Meters shall not be liable for incidental
or consequential damages for the breach of any express or implied warranty with
respect to this product or its calibration.
With proper care and maintenance, as recommended in the manual, the meter
should stay in calibration; however, because Wagner Meters has no control over the
manner in which the unit will be used, it makes no warranty that the meter will stay in
calibration for any specific period of time. Wagner Meters recommends purchasing a
calibration verification block or returning the unit to the factory for diagnostic checkup
and recalibration on the anniversary date of purchase, each year the meter is in
service.
This warranty is in lieu of all other warranties whether oral or written,
expressed or implied. Any implied warranties, including implied warranties of
merchantability and fitness for a particular purpose, are excluded. Agents and
employees of Wagner Meters are not authorized to make modifications to this
warranty or additional warranties binding on Wagner Meters Accordingly, additional
statements, whether oral or written (except written statements from an officer of
Wagner Meters) do not constitute warranties and should not be relied upon by the
customer.
This warranty is personal to the customer purchasing the product from Wagner
Meters and is not transferable.
All products returned for repair must be accompanied by a Repair Order form found
on our website at www.wagnerrepairs.com Repair should be returned to the
following address:
Wagner Meters
326 Pine Grove Road
Rogue River, Oregon 97537 888-750-5867

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WARNINGS
CONDUCTIVE MATERIAL
THIS MATERIAL CAN CONDUCT HEAT AND ELECTRICITY
DAMAGEMAY RESULT WHICH IS NOT
COVERED BY WARRANTY
DO NOT APPLY VERTICAL PRESSURE
TO HANDLE WHILE PROBE TIP ISSTILL
IN STACK.
WARNING