Reed Instruments R7900 Manual de usuario

Ultrasonic

Thickness

Gauge

Instruction

Manual

R7900

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Table of Contents

Introduction ................................................................................................ 4

Product Quality........................................................................................... 4

Safety ......................................................................................................... 4

Features...................................................................................................... 4

Specications............................................................................................. 5

Included...................................................................................................... 5

Instrument Description............................................................................... 6

Keypad Description.................................................................................... 6

Display Description .................................................................................... 7

Operating Instructions...........................................................................8-13

Setting Ultrasonic Sensor Frequency.................................................... 8

Zero Calibration..................................................................................... 8

Adjusting the Sound Velocity .............................................................8-9

Preparing the Measurement Surface................................................... 10

Taking Thickness Measurements......................................................... 10

Auto Power OFF.................................................................................. 10

Sound Velocity Measurements of a Material with

a Known Thickness.............................................................................. 11

Sound Velocity Calibration .............................................................11-12

Two Point Calibration .......................................................................... 12

Setting Alarm Thickness Limits ........................................................... 13

Minimum Capture Measurements ....................................................... 13

Measurement Methods .......................................................................13-14

Menu Options......................................................................................14-15

System Setup .................................................................................14-15

Memory Manager ................................................................................ 15

System Reset ...................................................................................... 15

Internal Memory Operation ...................................................................... 16

Reviewing Stored Data........................................................................ 16

continued...

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Maintenance............................................................................................. 16

Cleaning the Test Piece ....................................................................... 16

Protecting the Ultrasonic Sensor......................................................... 16

Replacing the Ultrasonic Sensor ......................................................... 16

Battery Replacement................................................................................ 17

Applications.............................................................................................. 17

Accessories and Replacement Parts ....................................................... 17

Appendix .............................................................................................18-22

Measurements on Cylindrical Surfaces ............................................... 18

Measuring Compound Proﬁles............................................................ 18

Measuring an Un-Parallel Surface ....................................................... 18

Inﬂuence of Material's Temperature .................................................... 19

Material with Large Attenuation........................................................... 19

Measuring Castings............................................................................. 19

Preventing Errors................................................................................. 20

Reference Test Pieces ..................................................................... 20

Ultra-Thin Material..........................................................................21-22

Rust, Corrosion, and Pits................................................................. 21

Error in Identifying Material.............................................................. 21

Degradation of Probe....................................................................... 21

Overlapped Material and Compound Material................................. 21

Inﬂuence of Metal Surface Oxidation..........................................21-22

Abnormal Readout of Thickness...................................................... 22

Utilization and Selection of a Coupling Gel (R7950) ........................ 22

Product Care ............................................................................................ 22

Product Warranty ..................................................................................... 23

Product Disposal and Recycling .............................................................. 23

Product Support....................................................................................... 23

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Introduction

Thank you for purchasing your REED R7900 Ultrasonic Thickness Gauge.

Please read the following instructions carefully before using your instrument.

By following the steps outlined in this manual your meter will provide years

of reliable service.

Product Quality

This product has been manufactured in an ISO9001 facility and has been

calibrated during the manufacturing process to meet the stated product

specications. If a certicate of calibration is required please contact the

nearest authorized REED distributor or authorized Service Center. Please

note an additional fee for this service will apply.

Security

Never attempt to repair or modify your instrument. Dismantling your

product, other than for the purpose of replacing batteries, may cause

damage that will not be covered under the manufacturer's warranty.

Servicing should only be provided by an authorized service center.

Features

• Measuresawiderangeofmaterialincluding;metals,plastic,ceramics,

composites, epoxies, glass, and other ultrasonic conductive materials

• Easy-to-readbacklitLCDdisplay

• Userselectableunitofmeasure(in/mm)

• Internalmemorystoresupto500measurements

• Displayssoundvelocityatthetouchofabutton

• Zeroadjustmentbutton

• UseradjustableHigh/Lowalarms

• Built-intwo-pointcalibrationfunction

• Autosleep,shutoffandlowbatteryindicator

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Specifications

MeasuringRange: 0.03to15.7"(0.65to400mm)

Accuracy: ±0.04mm(<10mm)

 ±(0.1%rdg.+0.04mm)(<100mm)

 ±(0.3%rdg.)(>100mm)

Resolution: 0.01mmor0.1mm(<100mm)

 0.1mm(>100mm)

VelocityRange: 1000to9999m/s(0.039to0.394in/µs)

Compatible Materials: Ultrasonic conductive materials

 (ie.metals,plastics,ceramics,

 composites,epoxies,glass)

SamplingTime: Lessthan1second

Display: 4-Digit,LCD

Backlit Display: Yes

ProbeLength: 3'(36")

InternalMemory: Yes(upto500readings,

 5lesupto100each)

LowBatteryIndicator: Yes

Power Supply: 2 AA Batteries

BatteryLife: Approx.100hours(Alkaline)

Product Certications: CE

OperatingTemperature: 32to122°F(0to50°C)

StorageTemperature: -4to140°F(-20to60°C)

OperatingHumidityRange: 20to80%

Dimensions: 5.9x2.9x1.3"(150x74x32mm)

Weight: 8.4oz(238g)

Included

• UltrasonicCouplantGel

• Probe

• HardCarryingCase

• Batteries

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Instrument Description

1. LCDDisplay

2. Calibration Test Block

3. Probe Inputs

Keyboard Description

1. ZeroButton

2. Mode Button

3. Down Button

4. Enter Button

5. Up Button

6. BacklightON/OFFButton

7. Power Button

8. Save/BrowseButton

9. Velocity Button

R7900

Ultrasonic Thickness Gauge

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Display Description

m/s

HIGH

MENU ALARM

F1 5M

1. Measured Value

2. Menu Settings

3. Saved File Name

4. Ultrasonic Sensor Frequency

5. Alarm Thickness Settings

6. Battery Indicator

7. Minimum Capture Mode

8. Coupling Indicator

9. Gain Indicator

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Operating Instructions

1. Insert the ultrasonic sensor into the probe sockets on the meter.

2. Press, hold an release the button for 2 seconds to turn the meter

on. Press the button to turn the meter off.

3. TheLCDwillbrieydisplayinformationaboutthemeter,andthen

show the current set sound velocity.

Setting Ultrasonic Sensor Frequency

1. Press the button to highlight the ultrasonic sensor frequency

setting on the display.

2. Continuously press the buttontotogglebetween2MHz,5MHz,

7MHz,10MHzandZWfrequencies.

3. To exit, press the button or by carrying out a measurement.

Zero Calibration

1. After setting the correct ultrasonic sensor frequency, set the sound

velocityto5900m/s(seeAdjusting the Sound Velocityfordetails).

2. Selecttheproperreceivinggain(seeSystem Setupfordetails).

3. Coatthe4mmcalibrationtestblockwithcouplinggel(R7950)and

place the sensor on the calibration test block while ensuring the

coupling indicator " "appearsontheLCDdisplay.

4. OncethecouplingindicatorappearsontheLCDdisplaypressthe

button to initiate zero calibration.

5. The meter will beep and then the screen will indicate that the calibration

is complete.

6. If zero calibration is not properly completed the meter will retain the

original value.

7. To delete the calibration data, see Memory Manager section for details.

Adjusting the Sound Velocity

1. While the meter is on, press the button and the meter will

display the current sound velocity.

2. Press the button to switch between the 5 pre-loaded sound

velocities, or press the and buttons to match the sound

velocity of the material under test as shown in the following table.

continued...

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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

continued...

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Preparing the Measurement Surface

1. Cleananydust,dirtorrustofftheobject,andremoveanycoating

such as paint.

2. Smooththesurfaceoftheobjectbygrindingorpolishingit.Youcan

also use a coupling gel with a high viscosity.

Important Note: In any ultrasonic measurement scenario, the shape and

roughness of the desired test material are of great importance. Rough,

uneven surfaces will prevent the ultrasonic sensor from seating properly

against the surface, thus limiting the penetration of ultrasound through the

material, resulting in unstable and therefore, unreliable measurements.

Taking Thickness Measurements

1. Setthesoundvelocityonthemeter(seeAdjusting the Sound

Velocityfordetails).

2. Apply coupling gel on the material, place the sensor rmly against

the desired measurement area.

Note: For most applications a single droplet of coupling gel is sufcient.

3. Verify that the coupling Indicator " "appearsontheLCDdisplay.

4. ReadthemeasurementontheLCDdisplay.

5. When you remove the ultrasonic sensor the value will stay on the

LCDandthecouplingindicator" " will disappear.

6. Press the button to save the measurement if applicable.

7. If the coupling indicator " " does not appear on the display,

or the measured values appear to be erratic, verify that there is an

adequate amount of coupling gel in between the ultrasonic sensor

and the material under test. It is also important that the ultrasonic

sensorsitsatagainstthematerial.

Auto Power OFF

To preserve battery life, the meter is programmed to turn itself after

approximately 3 minutes of inactivity. To disable this option, please see

System Setup section for details.

continued...

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