Unit UT311A Bedienungsanleitung

P/N:110401111643X

UT311A/UT312A

Vibration Tester User Manual

PREFACE

Thank you for purchasing the new UT311A/UT312A vibration tester. In order to

use this product safely and correctly, please read this manual thoroughly, especially

the Safety Instructions part.

After reading this manual, it is recommended to keep the manual at an easily

accessible place, preferably close to the device, for future reference.

LIMITED WARRANTY AND LIABILITY

Uni-Trend guarantees that the product is free from any defect in material and

workmanship within one year from the purchase date. This warranty does not apply

to damages caused by accident, negligence, misuse, modification, contamination

and improper handling. The dealer shall not be entitled to give any other warranty

on behalf of Uni-Trend. If you need warranty service within the warranty period,

please contact your seller directly.

Uni-Trend will not be responsible for any special, indirect, incidental or subsequent

damage or loss caused by any reason or speculation.

TABLE OF CONTENTS

1. Introduction

UT311A/UT312A is a handheld vibration tester which consists of acceleration sensor

and digital display circuit. It is mainly used to measure vibration acceleration, velocity

and displacement of mechanical equipment. It has the advantages of wide range,

easy operation and convenient carrying. It is an ideal inspection tool that can be used

for patrol detection of equipment vibration in power , metallurgic and petrochemical

industries.

2. Features

★ 2.4" TFT color screen, better display the measurement value and status

★ Automatically rotatable screen, easy to view and operate

★ Flashlight for measurements at night or in environments with undesirable lighting

conditions

★ It can measure acceleration, velocity, displacement

★ Switchable high and low vibration frequency

★ Rechargeable lithium battery

★ High sensitivity sensor, accurate measurement

★ Equipped with a long and short probe, suitable for measurement in different places

★ Simple design, compact structure, easy to carry and use

3. Unpack and Inspect

Vibration tester--------------------------------------1 PC

User manual-----------------------------------------1 PC

Safety instructions----------------------------------1 PC

Long probe-------------------------------------------1 PC

Short probe-------------------------------------------1 PC (installed on the vibration tester)

USB-C charging cable-----------------------------1 PC

U-type magnetic sucker---------------------------1 PC (UT312A only)

If any parts are missing or damaged, please contact your dealer.

UT311A/UT312A User ManualUT311A/UT312A User Manual

1. Introduction --------------------------------------------------------------- 4

2. Features 4

3. Unpack and Inspect 4

4. Safety Instructions 5

5. Components and Buttons 5

6. LCD Indicators/Icons 7

7. Operation

8. Specifications 10

9. Maintenance 11

10. Appendix 11

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4. Safety Instructions

Please read the Safety Instructions carefully before use.

A “Warning” identifies conditions and procedures that are dangerous to users. A

“Caution” identifies conditions and procedures that can cause damage to the product

or the equipment under test.

Read and follow the user manual before measuring.

Check the meter and accessories before use, and beware of any damage or

abnormal phenomenon. If the meter housing is obviously damaged, the LCD fails

to display or the meter cannot operate properly, please do not use the meter.

Please do not disassemble the meter or change the internal wiring to avoid damage

to the meter.

When is displayed on the LCD, charge the meter in time to ensure its normal

use and to get accurate test results.

Please use a standard DC 5V adapter to charge the meter . Do not use a power

supply or adapter of other voltages to avoid meter damage.

Do not store or use the meter in high temperature, high humidity, flammable,

explosive and strong electromagnetic field environment.

Please use soft cloth and neutral detergent to clean the meter housing. Do not

use abrasive and solvent, in case the housing is corroded.

When measuring exposed rotating parts or drivetrain parts of the machine, please

be careful to avoid being mangled in the machine.

5. Components and Buttons

5.1 UT311A Components

Probe (long/short probe optional)

Sensor

LCD

Power on/Measure

Power off/Mode

Flashlight/Lock screen

Type-C charging interface

and indicator light

Flashlight

Sensor

LCD

Power on/Measure

Power off/Mode

Flashlight/Lock screen

Type-C charging

interface

and indicator light

Measure

(cannot power on)

Probe (long/short probe or

magnetic sucker optional)

5.1 UT311A Components

Buttons

Button

Power

on/Measure

Power

off/Mode

Flashlight/

Lock screen

Long press

Long press to power on.

When the meter is turned

on, long press to start

measuring, release to

stop measuring.

Long press to power off.

Long press to turn

on/off the flashlight.

Short press

When the meter is turned on, short

press twice to start measuring, short

press again to stop measuring.

Switch between high/low frequency

acceleration, velocity and displacement

modes.

Unlock/lock the rotatable screen.

UT311A/UT312A User ManualUT311A/UT312A User Manual

Lock measurement mode

Data hold

Measurement status

Measurement value

High/Low acceleration

frequency range

Unlock/Lock the

rotatable screen

Battery status

Measurement

unit

6. LCD Indicators/Icons

7. Operation

7.1 Select the Probe

The test probe is divided into the following types. Please choose according to the

actual situation (Turn the probe counterclockwise to remove it. Do not turn the sensor.):

1) Measure with the short (S) probe: The probe is installed on the meter when it

leaves the factory. It is suitable for measuring a wide range of vibration and can

obtain good response values. In general, please use this short probe to measure,

as shown below:

2) Measure with the long (L) probe: The probe is an accessory in the packing box.

It is suitable for measuring narrow spaces or special objects, as shown below:

Note: The long probe can only be used for low frequency measurements.

When measuring high frequency acceleration above 1kHz, replace with the

short probe.

3) Measure without a probe: It is used for measuring flat surfaces to obtain stable

data, as shown below:

4) Measure with the U-type magnetic sucker (UT312A only): It is used to measure

flat or curved objects. It is suitable for taking measurements in crowded or

inaccessible places where hand-held measurement is dif ficult and cannot apply

pressure.

7.2 Power On and Check the Battery Status

1) Power on: Long press the Power On button , and the vibration tester is turned

on after the power-on logo is displayed.

2) Power off: When the meter is turned on, long press the Power Off button to

turn it off.

3) Auto power off:

a) When the battery is low, the icon flashes and the meter will automatically

shut down after 1 minute.

b) The screen will become dark if no button press occurs for 1 minute. The meter

will automatically shut down if no button press occurs for 5 minutes. Short press

any button to restore the screen brightness.

c) When the meter is taking measurements, it will not automatically shut down if

no button press occurs for 5 minutes.

4) Charging: When the battery icon shows low power, please charge the meter

in time. The indicator light is red when charging and turns green when fully charged.

7.3 Select the Measurement Mode

When the meter is turned on, short press the Mode button to step through the

following modes and units. Please select parameters according to measurement

requirements:

Low frequency acceleration (LO) 10Hz~1kHz m/s²→ High frequency acceleration

(HI) 1kHz~15kHz m/s² → Velocity mm/s → Displacement mm

Low frequency

acceleration (LO)

High frequency

acceleration (HI) Velocity Displacement

UT311A/UT312A User ManualUT311A/UT312A User Manual

109

LO:10Hz-1kHz

HI:1kHz-15kHz

10Hz-1.5kHz

10Hz-1kHz

0.1-199.9m/s²

0.1-199.9mm/s

0.001-1.999mm

0.1m/s²

0.1mm/s

0.001mm

√

±(5%+2dgts)

±(10%+2dgts)

7.4 Unlock/Lock the Rotatable Screen

Short press the Lock Screen button to lock/unlock the automatically rotatable

screen:

Lock: The icon shows on the LCD. The screen is locked.

Unlock: The icon shows on the LCD. The screen rotates in the direction of gravity.

Lock the screen direction Unlock the rotatable screen

7.5 Select the Measurement Method

There are two measurement methods:

a) Long press measurement

Start measuring: The default measurement method is long press measurement

after the meter is turned on. Long press the Measure button , the Data Hold

icon on the screen disappears and the Measurement Status icon flashes.

The meter starts measuring.

Stop measuring: Release the Measure button , the Data Hold icon shows

on the screen, and the meter stops measuring.

Long press the

Measure button

Release the

Measure button

Initial interface Start measuring Stop measuring

b) Lock measurement

Start measuring: Short press the Measure button twice, the Lock Measurement

icon shows on the screen and the Measurement Status icon flashes. The

meter starts measuring.

Stop measuring: Short press the Measure button again to exit the lock

measurement mode. The Data Hold icon shows on the screen and the meter

stops measuring.

Short press

the Measure

button twice

Short press

the Measure

button once

Initial interface Start measuring Stop measuring

After selecting a measurement method, hold the vibration tester and press the probe

vertically on the object to be measured, with the force of about 500g~1kg. Follow the

method described above and the measured vibration value will be displayed on the

screen.

Remarks: Users can turn on the flashlight at night or in environments with

undesirable lighting conditions. Long press the Flashlight button to turn

on the flashlight, long press again to turn it off.

Parameter

Acceleration (PEAK)

Velocity (RMS)

Displacement (P-P)

Automatically

rotatable screen

High/Low frequency

acceleration

Data hold

Flashlight

Battery indication

LCD type

LCD backlight

Auto power off

Probes

Battery type

Charging interface

Charging voltage

Charging time

Battery duration

Operating temperature

and humidity

Storage temperature

Product size

Product weight

Range Frequency Resolution Accuracy

2.4" TFT color screen

Become dark if no button press occurs for 1 minute

Automatically shut down if no button press occurs for 5 minutes

Long and short probes (optional), magnetic sucker (UT312A only)

1350mAh/3.7V lithium battery

Type-C

DC 5V

About 3h

About 12h

-10℃~50℃; humidity＜90%RH, non-condensing

-20℃~60℃

UT311A: 180×28×64mm (including the short probe);

UT312A: 168×28×64mm

UT311A: About 191g (including the short probe);

UT312A: About 364g (including the short probe)

* EMC standard: EN IEC 61326-1:2021.

8. Specifications

UT311A/UT312A User ManualUT311A/UT312A User Manual

1211

9. Maintenance

1) Operating environment: The vibration tester is a precision instrument, so it should

strictly avoid collision, percussion, damp, strong electricity, magnetic field, oil and

dust.

2) Clean the housing: Alcohol and diluent will corrode the meter housing, especially

the LCD. So when cleaning the housing, gently wipe with a small amount of water.

10. Appendix

a. Table of machine vibration levels (ISO2372)

Note:

(1) Class I: small machines (electrical motors of up to 15kW); Class II: medium

size machines (electrical motors with 15 to 75kW output); Class III: large prime

machines (rigid and heavy foundations); Class IV: large prime machines (soft

foundations).

(2) A, B, C and D are vibration levels. A means Good, B means Satisfactory, C

means Not Satisfactory, D means Not Allowed. The measurement velocity RMS

value should be in the three orthogonal directions of the bearing housing.

Ⅰ Ⅱ Ⅲ Ⅳ

11.2

1.8

2.8

4.5

7.1

0.28

0.45

0.71

1.12

Vibration severity Vibration velocity

Examples of quality judgement

for separate classes of machines

b. Maximum allowable vibration of motors greater than 1HP (NEMA MG1-12.05)

3000~4000

1500 2999~

1000 1499~

≤ 999

25.4

38.1

50.8

63.6

Rev (rpm) Peak-peak shifting amplitude (μm)

Note: For AC motors, use the highest synchronous Rev. For DC motors, use the

maximum power Rev. For series and multipurpose motors, use the operating Rev.

c. Maximum allowable vibration of large induction motors (NEMA MG1-20.52)

≥ 3000

1500 2999~

1000 1499~

≤ 999

25.4

50.8

63.6

76.2

Rev (rpm) Peak-peak shifting amplitude (μm)

The two standards are set by the National Electrical Manufacturers Association

(NEMA).

d. Formed winding squirrel-cage induction motors

50.8

38.1

25.4

63.6

50.8

25.4

720~1499

1500~2999

≥ 3000

Synchronous

Rev (rpm)

Peak-peak shifting amplitude (μm)

Elastic support Rigid support

The standard is set by the American Petroleum Institute (API).

UT311A/UT312A User ManualUT311A/UT312A User Manual

1413

e. ISO/IS2373 Motor Quality Standard According as Vibration Velocity

Quality rank Rev

Normal

Good

Excellent

H: High of shaft (mm), maximum

vibration velocity RMS (mm/s)

Limit of rank "N" is suitable for common motor.

* Due to different batches, the materials and details of actual products may be slightly

different from the graphic information. Please refer to the goods received. The

experimental data in the manual are theoretical values and all from Uni-Trend's

internal laboratories, for reference only. Customers cannot use them as bases for

placing orders. If users have any questions, please contact customer service.

* This user manual is subject to change without prior notice.*

600~3600

600~1800

1800~3600

600~1800

1800~3600

80<H<132

1.8

0.71

1.12

0.45

0.71

132<H<225

2.8

1.12

1.8

0.71

1.12

225<H<400

4.5

1.8

2.8

1.12

1.8

UT311A/UT312A User ManualUT311A/UT312A User Manual

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