REED R7900 User manual

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Ultrasonic Thickness Gauge
Instruction Manual
Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Model R7900

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2
Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Table of Contents
Features......................................................................................... 3
Specications.............................................................................4-5
Instrument Description .................................................................. 6
Operating Instructions..............................................................7-10
Adjusting the Sound Velocity....................................................... 7
Setting Probe Frequency ............................................................ 7
Preparing the Measurement Surface ........................................... 7
Taking Thickness Measurements................................................. 8
Zero Calibration .......................................................................... 8
Sound Velocity Measurements.................................................... 9
Setting Alarm Thickness Limits.................................................... 9
Minimum Capture Measurements ............................................. 10
Two Point Calibration ................................................................ 10
Measurement Methods ..........................................................11-13
Measurements on Cylindrical Surfaces...................................... 11
Measuring Compound Profiles .................................................. 12
Measuring an Un-Parallel Surface ............................................. 12
Influence of Material’s Temperature ........................................... 12
Material with Large Attenuation ................................................. 12
Measuring Castings .................................................................. 13
Preventing Errors....................................................................14-16
Reference Test Pieces............................................................... 14
Ultra-thin Material...................................................................... 15
Rust, Corrosion, and Pits .......................................................... 15
Error in Identifying Material ........................................................ 15
Degradation of Probe................................................................ 15
Overlapped Material and Compound Material ........................... 15
Influence of Metal Surface Oxidation ......................................... 16
Abnormal Readout of Thickness................................................ 16
Utilization and Selection of a Coupling Agent............................. 16
continued ...

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Menu Options.........................................................................17-18
System Setup ........................................................................... 17
Print Function............................................................................ 18
Memory Manager ..................................................................... 18
Restore Factory Defaults........................................................... 18
Internal Memory Operation ......................................................... 19
Reviewing Stored Data.............................................................. 19
Maintenance...........................................................................19-20
Cleaning the Test Piece............................................................. 19
Protecting the Probe................................................................. 19
Changing the Probe.................................................................. 20
Battery Replacement................................................................... 20
Features
• Capable of performing measurements on a wide range of material
including metals, plastic, ceramics, composites, epoxies, glass, and
other ultrasonic conductive materials
• Zero function and Sound Velocity Calibration
• Two-Point Calibration
• Coupling status indicator
• Auto sleep and auto power off function to conserve battery life
• Applications include monitoring various pipes and pressure vessels
in production equipment, monitor the thinning degree during use
• For use in petroleum, chemical, metallurgy, shipping, aerospace,
aviation, and other elds

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Specifications
Display: 128 x 64 LCD with LED backlight
Measurement Range: 0.65 to 400.0mm (0.03 to 15.7”),
dependant on materials and conditions
Sound Velocity Range: 1000 to 9999m/s (0.039 to 0.394in/µs)
Display Resolution: High: 0.01mm or 0.1mm (lower than 100.0mm)
Low: 0.1mm (more than 99.99mm)
Accuracy: ±0.04mm (lower than 10mm)
±(0.1% thickness + 0.04)mm (lower than 100mm)
±(0.3% thickness)mm (more than 100mm)
Units: Metric and Imperial, user selectable
Lower Limit for Steel Pipes:
5MHz probe: Ø20mm×3.0mm (Ø0.8× 0.12 inch)
7MHz probe: Ø15mm×2.0mm (Ø0.6× 0.08 inch)
Measurement Speed: 4 per second for a single point measurement
Memory: 5 les, up to 100 values for each le
(total of 500 logs)
Communication: RS-232 Serial Port (Optional)
Power Supply: 2 x 1.5V AA Batteries
Operating Time: 100 hours typical, with LED backlight off
Dimensions: 150 x 74 x 32mm
Weight: 238g
Includes: Transducer, couplant, 2 x 1.5V battery,
and carrying case
Probe Specifications
Frequency: 5MHz
Range: 1.2 to 300.0mm (steel)
Minimum Area: ø20×3mm
Applications: General Straight Probe

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Sound Velocity for Different Materials
Material Sound velocity
(m/s) (inch/µs)
Aluminum 6320 to 6400 0.250
Zinc 4170 0.164
Silver 3607 0.142
Gold 3251 0.128
Tin 2960 0.117
Steel, Common 5920 0.233
Steel, Stainless 5740 0.226
Brass 4399 0.173
Copper 4720 0.186
Iron 5930 0.233
Case Iron 4400 to 5820 0.173 to 0.229
Lead 2400 0.094
Nylon 2680 0.105
Titanium 5990 0.236
SUS 5970 0.240
Epoxy Resin 2540 0.100
Ice 3988 0.222
Plexiglass 2692 0.106
Grey Cast 4600 0.180
Porcelain 5842 0.230
Glass (Quartz) 5570 0.220
Polystyrene 2337 0.092
PVC 2388 0.094
Quartz Glass 5639 0.222
Rubber, Vulcanized 2311 0.091
Teon 1422 0.058
Water 1473 0.058

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Instrument Description
1. Probe Socket
2. RS-232 Socket
3. Probe
4. Test piece
Keypad Description
1. Velocity Button
2. Save/Browse Data
3. Power On/Off Button
4. Zero Button
5. Up Button
6. Backlight On/Off Button
7. Mode Button
8. Down Button
9. Enter Button
Display Description
1. Coupling Indicator
2. Gain Indicator
3. Minimum Capture Mode
4. Battery Indicator
5. Main Display Area
6. Alarm Thickness Limit
7. Probe Frequency
8. Save File Name
9. Menu Option

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Operating Instructions
1. Insert the probe into the probe socket on the meter
2. Press the Power Button to turn the meter on
3. The LCD will briey display information about the meter, and then
show the current set sound velocity
Adjusting the Sound Velocity
This instrument can display ve sound velocities alternatively.
1. Press the Velocity Button and the meter will display the current
sound velocity
2. Press the Velocity Button to switch between the 5 set velocities,
and press the Up and Down Buttons to adjust the set value
Setting Probe Frequency
1. Press the Mode Button to highlight the Probe Frequency setting
on the LCD
2. Press the Enter Button to change the frequency setting between
5M, 7M, and ZW probe frequencies
Preparing the Measurement Surface
• Clean any dust, dirt, and rust off the object, and remove any cover
such as paint.
• Smooth the surface of the object by grinding or polishing it. You
can also use a coupling agent with a high viscosity.
• If the surface has a rough machined surface and cannot be
smoothed down, adjust the angle between the probe’s crosstalk
interlayer plate (the metallic layer passing through the centre of
probe bottom) and the ne slots of the object that the interlayer
plate is perpendicular or parallel to. Take the minimum value of the
readouts as the measured thickness.

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Taking Thickness Measurements
1. Set the Sound Velocity on the meter
2. Coat the piece to be measured with coupling agent
3. Place the probe on the area and the Coupling Indicator will appear
on the LCD
4. Read the measurement on the LCD
5. When you remove the probe the value will stay on the LCD and
the Coupling Indicator will disappear
6. Press the Save Button to save the measurement
If the Coupling Indicator ashes or doesn’t appear it means that the
coupling is not good.
Zero Calibration
1. Select the correct frequency for the probe in use
2. Set the Sound Velocity to 5900m/s
3. Select the proper Receiving Gain (see System Setup)
4. Coat the 4mm Standard Test Block with Coupling Agent and press
the probe to the Test Block
5. If the Coupling Indicator is showing on the LCD then press the
Zero Button to initiate Zero Calibration
6. The meter will beep and then the screen will indicate that the
calibration is complete
7. If Zero Calibration is not properly completed the meter will retain
the original value
8. To delete the calibration data, see Memory Manager

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Sound Velocity Measurements
The sound velocity of a material can be measured using a test piece with
known thickness. Select a test piece with a minimum wall thickness of
20.0mm. Turn off the minimum capturing function prior to taking
measurement.
1. Measure the test piece with a calliper or micrometer
2. Measure the test piece with the probe until it displays a value and
remove the probe
3. Adjust the display to the actual thickness with the Up or Down
Buttons and press the Velocity Button
4. The LCD will display the Sound Velocity
5. Press the Save Button to save the value
Setting Alarm Thickness Limits
This meter will alarm if the thickness measurement is out of the pre-set
limits. When the measurement is lower than the low limit or higher than
the high limit, the alarm will sound.
1. Press the Mode Button to highlight the Alarm setting on the LCD
2. Press the Enter Button to adjust the Low Limit
3. Press the Up and Down Buttons to adjust the Low Setting
4. Press the Enter Button to save the Low Setting, and to set the
High Setting
5. Press the Up and Down buttons to adjust the High Setting, and
press the Enter Button to save the setting

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Minimum Capture Measurements
When the probe couples with the work piece it will display the current
measurement. When the probe is lifted away it will display the minimum
value of the measurement carried out while the MIN Indicator ashes for
several seconds. If you continue taking measurements while the MIN
Indicator is ashing, the former measurements will continue to take part
in the minimum value capturing. If you carry out measurements after the
MIN Indicator stops ashing the minimum value capturing will re-start.
When the Minimum capture function is ON the LCD will display the MIN
Indicator.
Two Point Calibration
1. Select two standard samples of the same material to be
measured, among which one has a thickness equal to or slightly
higher than the tested piece, and the thickness of another test
piece is slightly lower than the tested piece
2. Before carrying out 2-point calibration, turn off the Minimum
Capture Function and Erase the CAL Data in the Memory Manager
3. Set the 2-point calibration to ON in the System Setup Menu
4. Press the Mode Button to return to the main display
5. Press the Enter Button at any time during measurement to enter
the 2-Point CAL
6. Measure the thinner standard test piece and use the Up and Down
Buttons to adjust the measurement to standard value
7. Press the Enter Button and the LCD will prompt to measure the
thicker piece
8. Measure the thicker standard test piece and use the Up and Down
Buttons to adjust the measurement to standard value
9. Press the Enter Button when the calibration operation is nished

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Measurement Methods
There are three base measurement methods:
• Single Measurement: Measurement at one point.
• Double Measurement: Measure one point twice. During the two
measurements, the probe’s crosstalk interlayer plate should be
placed in a perpendicular direction. Take the minimum readout as
the accurate thickness of the material.
• Multi-point Measurement: Make several measurements in a range,
and take the minimum readout as the thickness of the material.
Measurements on Cylindrical Surfaces
When measuring cylindrical material, such as pipes or oil tubes, it is
important to properly adjust the angle between the probe’s crosstalk
interlayer plate and the axial line of the material to be measured.
1. Couple the probe with the material to be measured
2. Make the probe’s crosstalk interlayer plate perpendicular or
parallel to the axial line of the object
3. Shake the probe vertically along the axial line of the object, the
readouts displayed on screen will change regularly
4. Use the minimum readout
The standard for selecting the angle between the probe’s crosstalk
interlayer plate and the axial line of the object depends on the curvature of
the object. For a pipe with a large diameter the probe’s crosstalk interlayer
plate should be perpendicular to the axial line of the object. For a pipe
with small diameter, you can measure with the probe’s crosstalk interlayer
plate being both parallel and perpendicular to the axial line of the object,
and take the minimum readout as the thickness.

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Measuring Compound Profiles
When the material to be measured has a compound prole (such as bend
of a pipe), one can use the procedures to measure cylindrical surfaces.
The exception is that one should have two analyses and get two results
when the probe’s crosstalk interlayer plate is being both parallel and
perpendicular to the axial line of the object. Take the minimum readout as
the material thickness.
Measuring an Un-Parallel Surface
To get a satisfactory ultrasonic response the other surface of the object
must be parallel to or co-axial with the surface to be measured, otherwise
it will cause a measuring error or even provide no display.
Influence of Material’s Temperature
Both the thickness and transmitting speed of ultrasonic wave are
inuenced by temperature. If there is a high requirement of measuring
accuracy, one can use comparison method by:
• Use a test piece of the same material being measured, under
same temperature
• Obtain the temperature compensation coefcient
• Use this coefcient to correct the actual measurement of the
object
Material with Large Attenuation
Material with porous and coarse particles (such as bre) will cause a large
scatter and energy attenuation in the ultrasonic wave. This will cause
abnormal readouts or provide no display (generally, the abnormal readout
are less than the actual thickness). These type of materials cannot be
measured by this meter.

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Measuring Castings
Castings will cause large attenuations in sound energy due to coarse
crystal particles and a not-so-dense structure. The attenuation is due to
the material’s scatter and absorption of sound energy. Coarse out-phase
structures and coarse crystal particles will cause abnormal reection
(i.e. a grass-shaped or tree-shaped echo) resulting in error readings.
When the crystal particle is coarse, the anisotropy in exibility in metal’s
crystallizing direction will be obvious. This results in difference in sound
velocities in different directions, with the maximum difference being up to
5.5%. The compactness in different positions of the workpiece is different,
which will also cause difference in sound velocity. All of these will produce
inaccuracy in measurement.
While measuring castings pay attention to the following:
• When measuring casting with an un-machined surface use engine
oil, consistent grease, or water glass as a coupling agent
• Calibrate the sound velocity for the object with a standard test
piece having the same material and measuring direction as that
for the object to be measured
• If necessary, take a 2-point calibration

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Preventing Errors
Reference Test Pieces
To maintain high accuracy when taking measurements of different materi-
als it is important to use a standard test piece that resembles the material
and conditions being measured. The ideal reference test pieces should be
a group of test pieces with different thickness made of the same materials
that is going to be measured. The test pieces can provide calibrating fac-
tors for the meter (such as the microstructure of the material, heat-treating
condition, direction of particles, surface roughness, etc.). To meet the
highest requirements of accuracy a set of reference test pieces are critical.
Under most situations one can get satisfactory measuring accuracy with
only one reference test piece. This should be the same material and simi-
lar thickness with the object. Take an even-surfaced object, measure it by
using a micrometer, then use it as a test piece.
For thin material, when its thickness is near to the low limit of the probe’s
measuring range, one can use a test piece to determine the accurate low
limit. Never measure a material with a thickness lower than the low limit.
If the thickness range can be estimated, the thickness for the test piece
should select the high limit.
When the object is thick, especially an alloy with complex internal struc-
ture, select a test piece similar to the object from a group of test pieces,
giving you an idea of calibration.
For most casting and forging, their internal structures have some direc-
tion. In different directions, the sound velocity will experience some
change. To solve this problem the test piece should have an internal
structure with same direction as that of the object, and the transmitting
direction of sound wave in it should also be same as that for the object.
Under certain circumstances, referring to a material speed-of-sound
table can replace reference test pieces. The value in the speed-of-sound
table may have some difference from the actual measured values due to
difference in the material’s physical and chemical characteristics. This is
usually used for measuring low-carbon steel, and can only be taken as a
rough measurement.

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Ultra-thin Material
An error will occur when the thickness of an object is less than the low
limit of the probe. When necessary measure the minimum limit thickness
by comparing it with test pieces. When measuring an ultra-thin object,
sometimes errors called “double refraction” may occur. This results in a
displayed readout that is twice the actual thickness. Another error result
is called “pulse envelop, cyclic leap”. This results in the measured value
being larger than the actual thickness. To prevent these kinds of errors
repeat the measurement to conrm the results.
Rust, Corrosion, and Pits
Rust and pits on the surface of the object will cause irregular change in
readouts. In extreme situations it will even cause no readout. To avoid
errors, orient the probe’s crosstalk interlayer plate in different directions to
take multiple measurements.
Error in Identifying Material
If you calibrate the meter with one material and then measure another
material, an error will occur. Be careful in selecting correct sound velocity.
Degradation of Probe
The surface of the probe is allyl resin. After a long time of use its
roughness will increase resulting in reduced sensitivity. If determined that
this is the reason for errors, grind the surface with sandpaper or oilstone
to make it smooth and to give it good parallelism. If it is still not stable, the
probe must be replaced.
Overlapped Material and Compound Material
It is impossible to measure uncoupled overlapped material because the
ultrasonic wave can’t pass an uncoupled space. Since the ultrasonic wave
can’t transmit in a compound material in even speed you cannot use an
ultrasonic thickness-gauge to measure overlapped material and
compound material.

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Influence of Metal Surface Oxidation
Some metals can produce a dense oxidation layer on the surface, such
as aluminum. Even though the layer is in close contact with the substrate
and provides no obvious interface, the ultrasonic wave will have different
transmitting speeds in these two materials which will cause an error. In
addition, different thickness in oxidation layers will cause different errors.
One can make a reference piece from a batch of objects by measuring
with a micrometer or calliper, and using it to calibrate the instrument.
Abnormal Readout of Thickness
The operator should be able to identify an abnormal readout. Generally
the rust, corrosion, pit, and internal defect of the object will cause
abnormal readouts.
Utilization and Selection of a Coupling Agent
Coupling agent is for transmitting high-frequency energy between the
probe and the object. If the type of agent is wrong, or the utilization is
wrong, it will cause an error. The coupling agent should be used in a
proper amount and be coated evenly. When measuring a smooth surface
use an agent with low viscosity (such as the coupling agent provided
or light engine oil). When measuring a coarse object surface, or vertical
surface and top surface, use an agent with high viscosity (such as glycerin
grease, consistent grease, and lubricating grease, etc.).

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Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Menu Options
The Menu Function controls the settings and functions of the meter. To
enter the Menu press the Mode Button to highlight the Menu option on
the LCD and press the Enter Button.
System Setup
Highlight the System Setup option and press the Enter Button to enter
this menu. Press the Up and Down Buttons to scroll through the System
Setup Menu. To adjust a value, press the Enter Button to select it and
press the Up and Down Buttons to adjust the value. Press the Enter
Button again to Save.
Measurement Units: Metric and Imperial
Receiving Gain: LOW (resolution of 0.1mm) and HIGH (resolution
of 0.01mm). LOW is mainly used for measuring
coarse material with high scatter and small sound
absorption, such as cast aluminum, cast copper,
and other metallic parts.
Minimum Capture Measurement:
OFF and ON
2-Point Calibration: OFF and ON
Auto Down: Power-saving mode ON (default)
Baud Rate: 1200, 2400, 4800, 9600
Set Brightness: Press the Enter Button to select, and use the Up
and Down Buttons to adjust

reedinstruments
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18
Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Print Function
Highlight the Print Function option and press the Enter Button to enter this
menu. Press the Up and Down Buttons to scroll through the Print Function
Menu. To adjust a value press the Enter Button to select it and press the
Up and Down Buttons to adjust the value.
Print File and Print all Data: Connect the meter to a micro printer via the
RS-232 communication cable to print
measured results through the menu
selection. When the printing is completed,
the meter will beep and the display will
return to the Menu
Send Data to PC: Connect the meter to a PC by using a
communication cable to send measured
results directly to your PC
Memory Manager
Highlight the Memory Manager option and press the Enter Button to enter
this menu. Press the Up and Down Buttons to scroll through the Memory
Manager Menu. To adjust a value, press the Enter Button to select it and
press the Up and Down Buttons to adjust the value.
Erase File: Clears selected les
Erase All Data: Clears all saved les
Erase CAL data: Clears calibrating data
Restore Factory Defaults
Highlight the About Software option and press the Enter Button to enter
this menu. Press the Zero Button to restore the factory default settings for
the meter. The meter will shutdown after this process.

reedinstruments
www com
19
Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Internal Memory Operation
The internal memory is divided into 5 les. Each can save 100
measurement values. Before saving data be sure to set le number rst.
1. Press the Mode Button to highlight the Save File Name on the
LCD
2. Press the Enter Button to scroll through the memory les, F1 to F5
3. Press the Velocity Button to save and exit
Reviewing Stored Data
1. Press the Mode Button to highlight the Save File Name on the
LCD
2. Press the Save Button to select the contents of the memory
selected
3. Press the Enter button to erase the current saved value
4. Press the Up and Down buttons to scroll through he saved values
Maintenance
Cleaning the Test Piece
Clean the Test Pieces to prevent them from rusting. After taking a
measurement the test pieces should be cleaned. If the pieces are not to
be used for a long period of time coat them with oil to prevent rust.
Protecting the Probe
• The surface of the probe is made of allyl resin, which is susceptible
to scratches from coarse surfaces. During operation be sure to press
the probe lightly against the material being measured.
• Remove dirt from the cable after use as oil and dirt will age and
break the probe line.
• The probe cannot take measurements when the temperature of the
surface to be measured exceeds 60°C.

reedinstruments
www com
20
Pantone 534 Blue
Pantone 123 Yellow
Pantone 485 Red
Pantone 123 Yellow
Pantone 534 Blue
Black Rich Black -
20/20/20/100
Blue - 100/80/30/5
Yellow - 0/27/100/0
Red - 10/100/100/5
Yellow - 0/27/100/0
Blue - 100/80/30/5
Only if you REALLY need them:
Pantone 534 Blue - 100/80/30/5
Pantone 485 Red - 10/100/100/5
Pantone 123 Yellow - 0/27/100/
INSTRUMENTS
Changing the Probe
The degradation and wear of the probe’s interlayer plate will inuence
measurements. Replace the probe when the following occurs:
1. When measuring different thicknesses, it always displays the
same value
2. When plugging in the probe it has an echo indication or a mea-
sured value displays without measuring
Battery Replacement
1. Turn the meter off
2. Open the battery chamber
3. Take out the batteries, put in new ones taking note of the polarity
4. If the is not to be used for a long time take out the batteries to
avoid leakage and corrosion