Uni-T UT305C Manual

Uni-T Termometer UT305C

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Side 1/2

HAL Setup

This feature is to set up the high limit. When carrying

out measuring, the Thermometer beeps continuous if

the temperature is over this limit.

1. Press button to toggle to HAL mode.YELLOW

2. Press to increase the value by 0.1 or press and

hold to access quick setting until the maximum

value is reached. The thermometer stops and beeps.

3. Press to decrease the value by 0.1 or press and

hold to access quick setting until the minimum

value is reached or it lower than LAL value. The

thermometer stops and beeps.

4.Press to confirm this setting, the LCD displaysSET

5. This feature is not valid when carrying out

measurement with TC-K type thermocouple

6. HAL value cannot set below the LAL value.

Introduction

The Model UT305A/B/C and UT306A/B/C Infrared

Thermometers (hereafter, the “Thermometer”) can

determine the surface temperature by measuring the

amount of infrared energy radiated by the target’s

surface. They have different Distance to Spot(D:S)

ratios and different temperature ranges, read the

manual for details.

The Thermometer is a non-contact infrared instrument

designed with low power consumption, which can make

the measurements much faster and easier and meanwhile

save you amount of time from frequent battery replacement.

It can be powered by the battery or the source with USB

connected to.

This Manual uses UT305A as illustration.

Contacting Uni-Trend

To contact Uni-Trend. call (852) 2950 9168 or visit Uni-

Trend web site at

Safety Information

Warning

A warning identifies conditions and actions that

pose hazards to the user. To avoid electrical shock

or personal injury, follow these guidelines:

Do not point the laser toward anyone's eye or

allow the laser to strike the eye from a reflective

surface.

Before using the Thermometer inspect the

case. Do not use the Thermometer if it appears

damaged. Look for cracks or missing plastic.

Replace the battery as soon as the battery

indicator appears.

Do not use the Thermometer if it operates

abnormally. Protection may be impaired. When

in doubt, have the Thermometer serviced.

Do not operate the Thermometer around

explosive gas, vapor, or dust.

To avoid a burn hazard, remember that highly

reflective objects will often result in lower than

actual temperature measurements.

Do not use in a manner not specified by this

manual or the protection supplied by the

equipment may be impaired.

To avoid damaging the thermometer or the

equipment under test protect them from



EMF (electro-magnetic fields) from arc welders,

induction heaters, etc; static electricity; thermal

shock (caused by large or abrupt ambient

temperature changes – all 30 minutes from the

Thermometer to stabilize before use); placed on

or near objects of high temperature.

Table 1 and Figure 1 show various symbols and safety

markings that are on the Thermometer and in this

manual.

Table 1. Symbols

Symbol Explanation

Risk of danger. Important information.

See Manual.

Warning. Laser

Conforms to Standards of European

Union

Battery

Features

The Thermometer includes:

 Single Laser Pointer

USB-Powered

Level 2 White Backlight (With USB connected, this

feature will be on automatically).

Current Temperature Plus MIN, MAX, DIF, AVG

Display Functions

Adjustable Emissivity

Trigger Locked

℃ ℉/ Selectable

Tripod mount

One 9V Battery

Display

The primary temperature display reports the current or

last IR temperature reading until the 8-second hold

time elapses.

The secondary temperature display reports a choice of

maximum, minimum, difference between maximum and

minimum temperature or average value.

You can toggle through the maximum, minimum,

difference and average IR temperatures anytime the

display is on by pressing the yellow button. The MAX,

MIN, DIF and AV temperatures are constantly calculated

and updated when the trigger is pressed. After the

trigger is released, the MAX, MIN, DIF and AV

temperatures are held until the Thermometer is auto

power off.

Notes

When the battery is low , appears on the display.

The last selection (MAX/MIN/DIF/AVG) is maintained

on the secondary display even after the Thermometer

has been turned off, providing the batteries have not

failed.

Buttons and Connector

Figure 4. Buttons and Connector

How the Thermometer Works

Infrared thermometers measure the surface temperature

of an opaque object. The Thermometer’s optics sense

infrared energy, which is collected and focused onto a

detector. The Thermometer’s electronics then translate

the information into a displayed temperature reading

which appears on the display. The laser is used for

aiming purposes only.

Operating the Thermometer

The Thermometer turns on when you press the trigger.

The Thermometer turns off when no activity is detected

for 8 seconds.

To measure temperature, aim the Thermometer at the

target, pull and hold the trigger. Release the trigger to

hold a temperature reading.

Be sure to consider distance-to-spot size ratio and filed

of view. The laser is used for aiming only.

Locating a Hot or Cold Spot

To find a hot or cold spot, aim the Thermometer outside

the target area. Then, slowly scan across the area with

an up and down motion until you located the hot or cold

spot. See Figure 5.

Figure 5. Locating Hot or Cold Spot

Distance and Spot Size

As the distance (D) from the target being measured

increases, the spot size (S) of the area measured by

the unit becomes larger. The spot size indicates 90%

encircled energy. The maximum D:S is obtained when

the Thermometer is 1000mm (100in) from the target

resulting in a spot size of 20mm (2 in). See Figure 6.

Figure 6. Distance and Spot Size

Field of View

Make sure that the target is larger than the spot size.

The smaller the target, the closer you should be to it.

See Figure 7.

Figure 7. Field of View

Emissivity

Emissivity describes the energy-emitting characteristics

of materials. Most organic materials and painted or

oxidized surfaces have an emissivity of about 0.95.

If possible, to compensate for inaccurate readings that

may result from measuring shiny metal surfaces, cover

the surface to be measured with masking tape or flat

black paint (<150 / 302 ) and use the high emissivity

setting. Allow time for the tape or paint to reach the

same temperatures as the surface beneath it. Measure

the temperature of the tape or painted surface.

emissivity selector. Even with emissivity selector, it can

be difficult to get a completely accurate infrared

measurement of a target with a shiny or metallic surface.

User Setup

Press button to step through SET Emissivity Setup→

Trigger Lock→Switching → Normal Measurement.　　　　

Press button to save and exit Setup.YELLOW

Emissivity Setup

This feature is to change the value of emissivity.

To adjust values for emissivity, follow the below

procedure:

1. Press to select emissivity set up, icon onSET E=0

the display is blinking.

2. Press to increase the value by 0.01 or press and

hold to access quick setting. The maximum value

is 1.00.

3. Press to decrease the value by 0.01 or press and

hold to access quick setting. The minimum value

is 0.10.

The Thermometer allows you to adjust the unit’s

emissivity for the type of surface before measured.

Refer to Table 2. But it is only a typical case. You could

base on your own case and materials to have different

setting.

Trigger Lock Setup.

This feature is to set trigger lock or unlock

To lock or unlock the trigger, follow the below procedures:

1. Press SET to select trigger lock setting, the is blinking.

2. Press or to select ON or OFF.

When the trigger is locked, the Thermometer is on for

continuous measurement, there is no need to pull the

trigger.

When the trigger is unlocked, user needs to pull the

trigger for measurement. When you release the trigger,

the Thermometer will keep hold the measurement result

automatically.

Switching /

This feature is to select or .

1. Press to chooseSET

selection mode,

2. Press or to select or .

If you cannot use paint or use tape, then you could

improve the accuracy of your measurements with the

LAL Setup

This feature is to set up the low limit. When carrying

out measuring, the Thermometer beeps continuous if

the temperature is below this limit.

1. Press button to toggle to LAL mode.YELLOW

2. Press to increase the value by 0.1 or press and

hold to access quick setting until the maximum

value is reached or higher than HAL value. The

thermometer stops and beeps.

3. Press to decrease the value by 0.1 or press and

hold to access quick setting until the minimum

value is reached. The thermometer stops and beeps.

Refer refer to the below User Setup topics for details.

Backlight button. To step through Backlight Level one, Level Two and Backlight Off status,

accompanied by on/off icon.

for details.

Connect USB cable for supply power to the unit or data transmission with the software;

Backlight will automatically turn on;

Produkt Specifikationer

Mærke:	Uni-T
Kategori:	Termometer
Model:	UT305C

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