Uni-T UT305C Manual de Usario

Uni-T termómetro UT305C

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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;

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 higher than the LAL value.

DATA

This feature is to store the data measuring under infrared

mode.

1. The maximum number of data to be stored is 99.

2. When the storage is empty, it displays “--- . ---“

3. Under non-measurement mode, press and hold DATA

and for 8 seconds to clear the stored data, the

Thermometer beeps.

4. Under measurement mode, press buttonYELLOW

to toggle to DATA mode.

5. Press or to select the location of storing the data.

6. Press DATA to store the value.

TC-K Thermocouple Measurement

This feature is to measure temperature with K type

thermocouple.

1. Press button to toggle to T-C mode. TheYELLOW

LCD display shows OL before the thermocouple is

connected.

2. Connect the K type thermocouple, press the trigger to

start measuring. The LCD display shows the reading.

3. Release the trigger, the reading is kept, LCD shows

T-C. The temperature reading is shown on the bottom

of right hand side.

HOLD

The display will remain activated 8 seconds after the

trigger is released. HOLD appears in the upper middle

of the display. When the trigger is pulled again, the

Thermometer will begin measuring in the last function

selected.

Typical Measurements

This section describes a variety of measurements often

performed by technicians.

Operation Tips:

User could select to turn on or off the backlight

and laser whenever you are making readings with

the Thermometer. But if you are using USB to

power up the Thermometer, the two levels white

co lour b ack lig ht wil l b e on aut om atically.

Relatively high emissivity normally means emissivity

setting of about 0.95.

Relatively low emissivity normally means emissivity

setting of about 0.30.

When user cannot identify the emissivity of the

object to be measured, user could cover the surface

to be measured (temperature >150 ) with black

electric tape (emissivity of about 0.95). Allow time

for the tape to reach the same temperature as the

object to be measured. Measure and record the

temperature of the tape. Target the Thermometer to

the object to be measured, adjust the emissivity

setting to make it as the same temperature as the

tape. At this time, the Thermometer emissivity setting

is close to the emissivity of the object to be

measured, measurement could be started.

Testing Contactors (Starters)

1. Press to select emissivity. Press to selectSET /

relatively low emissivity for bright contacts, or 0.7 mid

level for darkened contacts.

2. Press button to select MAX.YELLOW

3. Measure line and load side of one pole without

releasing trigger

4. A temperature difference between the line and load

sides of a pole indicate increased resistance of one

point and a contactor may be failing.

Testing Enclosed Relays

1. Press and then press to set emissivity toSET /

relatively low for uninsulated connectors or relatively

high for plastic encased relays or for bakelite enclosed

relays or insulated connectors.

2. Press button to select MAX.YELLOW

3. Start to scan.

4. Measure the relay casing, looking for hot spots.

5. Measure electrical connections on relay terminals

looking for hot spots.

Testing Fuses and Buss Connections

1. Press and then press to set emissivity toSET /

relatively high for paper covered fuse body or insulated

connections.

2. Press button to select MAX.YELLOW

3. Scan the paper covered length of fuse.

4. Without releasing the trigger, scan each fuse. Unequal

temperatures between fuses may indicate voltage

or amperage imbalance.

5. Press and then pressSET / to set emissivity to

relatively low, for metal fuses and caps and insulated

buss connections.

6. Press button to select MAX.YELLOW

7. Scan each end cap on each fuse/

Note

Unequal temperatures or a high temperature indicates

loose or corroded connection through the fuse buss

spring clip.

Testing Electrical Connections

1. Press and then press to set emissivity toSET /

relatively low for uninsulated connectors or buss

connections or relatively high for insulated connections.

Note

Conductors are typically smaller than the Thermometer’s

spot size. If the spot size is bigger than the connector,

the temperature reading is the average within the spot.

2. Scan the conductor, moving toward direction of

electrical connector (quick connect, wire nut, buss

connection, or lug).

Scanning Walls for Air Leaks or Insulation

Deficiencies

1. Turn off heating, cooling, and blower.

2. Press SET to select emissivity. Press / to select

emissivity relatively high for painted surfaces or

window surfaces.

3. Press YELLOW button to select MIN when opposite

side of wall is at lower temperature and or select MAX

when opposite side of wall is at higher temperature.

4. Measure an interior partition wall surface temperature.

Do not release the trigger. Record this temperature

as your baseline (or benchmark) for a “perfectly”

insulated wall.

5. Face the wall to be scanned. Stand 1.2m away to

scan a 10cm spot on the wall.

6. Scan horizontal rows of wall from top to bottom, or

horizontal rows of ceiling from wall to wall. Look for

greatest deviations from baseline temperature to

identify problems. This completes the insulation test scan.

Turn on the blower (no heat, no cooling) and retest. If

test results with the blower on are different than results

with the blower off, this may indicate air leaks in

conditioned envelope walls. The air leaks are caused

by duct leaks that create a pressure differential across

the conditioned space envelope.

Testing Bearings

Warning

To avoid injury when testing bearings:

Do not wear loose clothing, jewelry, or anything

around neck when working around moving parts

such as motors, belts, blower, and fans.

Make sure an electrical disconnect is within

reach and operating correctly and freely.

Do not work alone.

Note

It works best to compare two similar motors operating

similar loads.

1. Press and then press SET / to select relatively

high emissivity.

2. Press button to select MAX. YELLOW

3. Enable motor and allow it to reach steady state

operating temperatures.

4. Disable the motor if possible.

5. Measure the two motor bearing temperatures

6. Compare the two motor bearing temperatures.

Unequal temperatures or a high temperature can

indicate a lubrication or other bearing problem that

is resulting from excess friction.

7. Repeat the sequence for the blower bearings.

Testing Belts and Sheaves

1. Press and then press SET / to select relatively

high emissivity.

2. Press button to select MAX.YELLOW

3. Enable the motor and allow it to reach a steady state

operating temperatures.

4. Aim the Thermometer at the surface to be measured.

5. Start recording temperature

6. Slowly move the Thermometer up the belt toward

second sheave.

If belt is slipping, sheave temperature will be high

from friction.

If belt is slipping, belt temperature will remain

high between sheaves.

If belt is not slipping, belt temperature will reduce

between sheaves.

If inner surfaces of sheaves are not a true “V”

shape, this indicates belt slippage and will continue

to operate at elevated temperatures until sheave

is replaced.

Sheaves must be properly aligned (include “pitch

& yaw”) for belt and sheaves to operate at appropriate

temperatures. A straight edge or taut string, can

be used to check alignments.

Motor sheave should operate at a temperature

consistent with blower sheaves.

If motor sheave is at a higher temperature at motor

shaft than at outer circumference, belt is probably

not slipping.

If outer circumference of sheave is at higher

temperature than sheave at motor shaft, then belt

is probably slipping and sheaves may be misaligned.

Checking Hydronic Radiant Heat Applications

Radiant heat tubes in the floor will normally run parallel

to the outside walls. Starting at the floor wall juncture,

scan parallel to the wall while moving into the room

away from the wall. Parallel to the outside wall you

should find parallel isothermal rows indicating the

location of heat tubes below the surface. Perpendicular

to the outside wall, you should find rising and falling

temperatures at equal distances. High temperatures

indicate you are scanning a heat tube beneath the floor

surface, low falling temperatures indicate a space

between the heat tubes.

1. Press and then press SET / to select relatively

high emissivity.

2. Press button to select MAX.YELLOW

3. To locate radiant heat tubes in floor, temporarily

elevate the loop temperature to create hotter spots

for identifying tubing runs.

4. Before releasing trigger, press button toYELLOW

toggle between MIN, MAX, DIF floor temperatures

and record the temperature for future comparison

and trending under similar conditions.

Measuring Grille, Register, or Diffuser Discharge

Temperature

1. Press and then press to select relativelySET /

high emissivity.

2. Aim the Thermometer at the discharge air grille,

3. Measure discharge temperature.

4. Release trigger to freeze the temperature reading

for 8 seconds and record this temperature.

5. Grille, register, or diffuser temperature should be

equivalent to discharge temperature at the air handler.

Checking for Blockage in Air-To-Air Evaporators

or Condensers

1. Remove panels to gain access to coil return bends

or hairpins.

2. Press and then press SET / to select relatively

high emissivity for copper tube.

3. Start the refrigeration system.

4. Aim the Thermometer at coil turn bends/hairpins.

5. Start recording temperature.

6. Take temperature of each return bend/hairpin.

All evaporator return bends/hairpins should be at

or slightly above evaporator saturation temperature

from the pressure/temperature chart.

All condenser return bend/hairpins should be at or

slightly less than condenser saturation temperature.

If a group of return bends/hairpins do not conform

to expected temperatures, that indicates a blocked

or restricted distributor or distributor tube.

Maintenance

Changing the Battery

To install or change the 9V battery, open the battery

compartment the battery as shown in Figure 2.

Cleaning the Lens

Blow off loose particles using clean compressed air.

Carefully wipe the surface with a moist cotton swab.

The swab may be moistened with water.

Cleaning the Housing

Use soap and water on a damp sponge or soft cloth.

To avoid damage to the Thermometer, do not soak the

unit into water.

~ END ~

This operating manual is subject to change without notice.

; 600 :±3%＞ ℃

IR Accuracy

T-C Accuracy

to stated accuracy.

Display Resolution

；（＜ ℃ ℃ ＞ ℃ ℃ ℉）10 : 0.2 ; 999.9 :1 /1

Pointer Single laser pointer

wavelength: 630 to 670mm

Battery Life Alkaline: around 30 hours; Dry Zinc-Manganese:around 10hours

P/N:110401104358X DATE:2018.06.26 REV.5

Especificaciones del producto

Marca:	Uni-T
Categoría:	termómetro
Modelo:	UT305C
Color del producto:	Zwart
Cantidad por paquete:	1 stuk(s)
Compatibilidad:	VREC-DZ700DC, VREC-DH200
Tamaño del filtro:	- mm