REED TM-8811 User manual

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Model TM-8811
Digital Thickness Gauge
with Velocity Function
Instruction
Manual
www.reedinstruments.com
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Table of Contents
Features......................................................................................... 3
Specications................................................................................ 3
Meter Description.......................................................................... 4
Operating Instructions................................................................4-6
Measuring Procedures .............................................................. 4
Material Selection...................................................................... 5
Calibration................................................................................. 6
Measuring Sound Velocity......................................................... 6
Battery Replacement..................................................................... 7
For service (repairs or calibration) on this or any other REED product
or information on other REED products, contact REED Instruments at
[e-mail].
www.reedinstruments.com
1-877-849-2127 | [email protected]

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Features
• Exclusive micro-computer LSI circuit & crystal time base offer
high accuracy
• Digital display provides exact readings without guessing or errors
• Broad band receiving sensitivity means the meter can read probes of
different frequencies
• Auto calibration
• Automatic material calibration
• Selectable metric or imperial
• Measures the thickness of steel, cast iron, aluminum, red copper, zinc,
quartz glass, polyethylene, PVC, gray cast iron & nodular cast iron
• Display sound velocity at the touch of a button
• Automatic power off
Specifications
Measurement Range: 1.2 to 200 mm (#45 steel)
Accuracy: ±(0.5% + 0.1mm)
Resolution: 0.1 mm
Velocity Range: 500 to 9000 m/s
Display: 4-digit, 10mm high LCD
Power Supply: 4 x 1.5V “AA” alkaline batteries
Dimensions: 161 x 69 x 32mm
Operating condition: Temperature 0 - 50°C
Humidity <80%
Weight: 258g (with batteries)
Includes: Ultrasonic sensor, carrying case
& instruction manual
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Meter Description
1 — Material selection button
2 — Power button
3 — Plus button
4 — Velocity button
5 — Sensor plug
6 — Coupling indicator
7 — Display
8 — Calibration button
9 — Ultrasonic sensor
10 — mm/inch button
11 — Minus button
12 — Standard block
13 — Battery compartment/cover
Operating Instructions
Measurement Procedures
1) Press the Power button (#2 above) to turn the unit on.
2) Press the mm/inch button (#10 above) to select the correct unit of
measure.
3) Place the Ultrasonic sensor (#9 above) on the material surface being
measured. Select the correct Material selection code (see the Mate-
rial Selection instructions on page 5). Verify the coupling is okay by
verifying that the Coupling indicator symbol (#6 above) is on. The
reading on the display is the measurement value.
4) The reading will be held until a new measurement is taken or until the
unit is turned off.
5) There are two ways to turn the power off. Either manually, at any time
by pressing the Power button or automatically, as the unit has the auto
power off feature. This feature allows the unit to turn itself off after ap-
proximately 1 minute without button operation.
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Material Selection
1) Press the Power button (#2 on page 4) to turn the unit on.
2) Press the Material Selection button (#1 on page 4) and the display
(#7 on page 4) will show the code “cdxx” or “xxxx”. The “cd” is the ab-
breviation for “code” and “xx” represents a number from 01 to 11. The
“xxxx” represents a 4-digit number which is the sound velocity of the
material being measured. The “cdxx” material relationship is as follows:
No. Code Material No. Code Material
1 cd01 Steel 7 cd07 Quarz glass
2 cd02 Cast iron 8 cd08 Polyethylene
3cd03 Aluminum 9 cd09 PVC
4cd04 Red copper 10 cd10 Gray cast iron
5 cd05 Brass 11 cd11 Nodular cast iron
6cd06 Zinc 12 xxxx Sound velocity
3) Press the Plus button (#3 on page 4) or Minus button (#11 on page 4)
to select the material code of what is being measured. Then press the
Material Selection button (#1 on page 4) to conrm your selection. The
display will show a “0” to indicate you’ve selected your material. If you
select a material code but do not conrm the selection, the code will
automatically change to “0” after several seconds.
4) To select the Sound velocity code, simply continue pressing the Plus or
Minus buttons until you see a 4-digit number in the display. The 4-digit
number represents the last sound velocity measurement taken. When
selecting this velocity, you can measure the thickness of the same
material as the last.
5) It is not necessary to select the material code once the material code is
conrmed (it is automatically stored to the memory of the meter) unless
the material to measure is different from before.
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Calibration Procedures
1) Drop a little oil on the 5 mm Standard block (#12 on page 4).
2) Press the Calibration button (#8 on page 4), the “CAL” symbol will be
shown on the Display. “CAL” is the abbreviation for calibration.
3) Place the Ultrasonic sensor (#9 on page 4) on the Standard block
(#12 on page 4). Verify the coupling is okay by verifying that the Cou-
pling indicator symbol (#6 on page 4) is on. “5.0” mm (or “0.197”
inch) and “CAL” will be shown in the display. When steady, press the
“CAL” button to conrm and then the unit return to the state of mea-
surement.
4) The calibration result will automatically be saved to the unit once
conrmed. It is not necessary to calibrate often unless you suspect the
accuracy of measurements is off.
Measuring Sound Velocity
1) Press the “VEL” button (#4 on page 4) and the display will show the last
velocity measurement.
How to measure the thickness by the known velocity?
2) The velocity can be changed by pressing the Plus or Minus buttons to
the velocity value. The increment is 10m/s every time when pressing the
Plus or Minus buttons. The increment is 100m/s if pressing the Plus or
Minus buttons for more than approximately 4 seconds.
3) Drop a little oil onto the material to be measured and place the
Ultrasonic sensor onto the surface. The reading on the display is the
thickness if it is properly coupled. Therefore, if we know the velocity of
a certain material, it is easy to measure the thickness.
How to measure the velocity with a sample for which you
know the thickness?
2) Find a sample for which you know the thickness.
3) Repeat steps 2 & 3 above until the measurement value is the same as
the known thickness. Therefore the set value is the velocity of the mate-
rial to be measured, by which you can measure any unknown thickness
of the same material.
4) To browse the velocity, press the “VEL” button. To stop browsing, press
the “VEL” button again or wait until the meter automatically shows “0”.
5) By using the velocity measurement, it is easy to measure the thickness
of any hard materials.
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Battery Replacement
1) When the low battery symbol appears in the display,
it is time to replace the batteries.
2) Open the Battery cover (#13 on page 4) and remove the batteries.
3) Install 4 new AA batteries verifying you are following the correct polarity.
For service (repairs or calibration) on this or any other REED product
or information on other REED products, contact REED Instruments at
[e-mail].
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www.reedinstruments.com
1-877-849-2127 | [email protected]