UNI-T UT305S, User Manual

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P/N:110401109910X

Overview

UT305S is a high-accuracy, high-D:S ratio (50:1), wide range (-50°C~2000

), high repeatability, durable and 

°C

easy-to-operate infrared thermometer (hereinafter referred to as the thermometer) designed according to the 
user's field needs. The thermometer can quickly and accurately determine the surface temperature of the target 
by measuring the infrared energy radiated by the target surface, which is suitable for non-contact temperature 
measurement.

UT305S
Infrared Thermometer User Manual

Safety Instructions

  Warning:

In order to prevent eye damage or personal injury, please read the following safety instructions before using the 
product:
1. Do not point the laser directly at persons or animals or indirectly through reflective surfaces. 
2. Do not look directly at the laser or with optical tools (binoculars, microscopes, etc.).

LASER RADIATION

DO NOT STARE INTO BEAM

CLASS 2 LASER PRODUCT

λ

=630-670nm,<1mW, EN60825-1:2014

Caution:

If the laser irradiates the user’s eyes, please close the eyes immediately and turn the head away.

Do not disassemble or refit the product and laser without permission.

To ensure its safety and accuracy, this product should only be repaired by professional maintenance personnel 
using original replacement parts.

Replace the batteries when the low battery indicator shows to prevent incorrect measurements.

Please check the product before using it. If it is damaged, cracked on the surface or missing plastic parts, do 
not use it.

Please refer to the emissivity information for the actual temperature. Highly reflective objects or transparent 
materials will make the actual temperature higher than the measured temperature. When measuring these objects, 
pay attention to the risk of burns.

Do not use the product in an environment with flammable and explosive liquid, gas or dust.

Do not use the product around the environment with steam, dust, or large temperature fluctuations. It may bring 
inaccurate results and risks.

Put the product in the current environment for more than 30 minutes before using it to ensure measurement 
accuracy.

Do not leave the thermometer on or near objects of high temperature.

Model

Optical resolution

Measurement range

LCD size

LCD display

Accuracy

Temperature index

Repeatability

Emissivity

Response time

Spectral response

Auto power off

UT305S

50:1

-50°C~2000

 (-58°F~3632

)

°C

°F

35*35mm

High-contrast color EBTN

-50

~0

: ±(1.0

+0.1

/

)

°C

°C

°C

°C °C

0

~2000

: ±1.0

 or ±1.0% (take the larger value)

°C

°C

°C

-58

~32

: ±(2.0

+0.1

/

)

°F

°F

°F

°F °F

32

~3632

: ±2.0

 or ±1.0% (take the larger value)

°F

°F

°F

±0.1

/

 or ±0.1%/

 take the larger value

(±0.1°F/°F or ±0.1%/°F take the larger value) 

°C °C

°C

0.5

 or 0.5% take the larger value

(1.0°F or 0.5% take the larger value) 

°C

0.1~1.0 (adjustable, stores 5 sets of preset values)

≤

250ms (95% of reading)

8μm~14μm

15s

Low battery indication

High/low temperature LED alarm

High/low temperature sound alarm

Data hold

Unit conversion (

/

)

°C °F

MAX/MIN/AVG/DIF

Lock measurement

Laser

Operating temperature

Storage temperature

Operating humidity

Drop proof

Battery type

Battery life

Product color

Product weight

Product size

Single laser, wavelength: 630nm~670nm, output power  1mW, type: class 2

<

-5°C~50

 (23°F~122

)

°C

°F

-20

~60

 (-4

~140

)

°C

°C

°F

°F

<90%RH (non-condensing)

1m

1*1604A 9V alkaline battery

10 hours (continuous measurement mode with laser and backlight on)

Red + grey

325g

179.00×126.50×53.00mm

Safety Standards

CE certification: EN61326-1:2013; Safety standards of laser products: EN60825-1:2014
FDA: Class 2; IEC: Class 2

Reference Standard

JJG 856-2015

Characteristics

1) With single-laser and high-accuracy laser adjustment technology.
2) Bright, easy-to-read and high-contrast color EBTN display.
3) MAX/MIN/AVG/DIF hold.
4) Store  5 sets of preset values (high and low temperature alarm and emissivity) for quick setting.
5) With red, green and blue LED and buzzer sound alarm, can quickly find abnormalities.
6) Trigger lock, suitable for processes that require temperature monitoring.
7) Equipped with a tripod mounting hole.

Laser

Infrared receiving window

Trigger

Battery cover

Tripod mounting hole

LCD display

SET button

MODE button

Laser switch button

HI/LO button

Laser warning label

Appearance

Trigger lock

Buzzer

Temperature measurement alarm

Low battery

Temperature measurement

Temperature hold

Temperature unit

Temperature main display

Temperature secondary display

Emissivity

Laser

Measurement mode

LCD Indicators

Startup and Shutdown

Startup

Short press (less than 0.5s) the trigger to turn on the thermometer, and the measured value before the last shutdown 
will be displayed. Pressing MODE button can view MAX/MIN/AVG/DIF.

Shutdown

The thermometer will automatically shut down after 15 seconds without any operation in the HOLD mode, and save 
the current measured value.

Manual Measurement

1) After aiming at the measured object, press the trigger and hold it. When the SCAN symbol is flashing, it means 

that the temperature is being measured, and the measurement result will be updated on the LCD.

2) Release the trigger, the SCAN symbol will disappear while the HOLD symbol will be displayed. The thermometer 

will stop measuring the temperature and keep the last measured value.

Lock Measurement

1) When lock measurement is turned on, short pressing the trigger can trigger this function. The      symbol will be 
    displayed on the LCD and the SCAN symbol will flash. The thermometer will measure the target temperature 
    continuously without pressing the trigger all the time.
2) Press the trigger again, the      and SCAN symbols will disappear while the HOLD symbol will appear. The 
    thermometer will stop measuring and keep the last measured temperature.
3) In the lock measurement setting interface, the user can set the lock measurement time (1m~5h).  After the lock 
    function is triggered, the timing starts. When the set time is reached, the thermometer will automatically shut 
    down and save the last measured value. The user can view the measured value by short pressing (less than 0.5s) 
    the trigger (Caution: the measured value will be cleared if the user long presses the trigger). This operation is 
    suitable for processes that require regular temperature monitoring.

Caution: The measured target should be greater than 2 times the thermometer light spot diameter (S), and 
then the test distance (D) can be determined according to the D: S relationship diagram.

MAX/MIN/AVG/DIF Value

Short press the "MODE" button to switch among "MAX

→

MIN

→

AVG

→

DIF" measurement modes in sequence, and 

the temperature of the corresponding mode will be displayed in the secondary display position (as shown below).

Function Settings

In the HOLD interface, pressing the "SET" button can enter the high alarm limit

→

low alarm limit

→

emissivity

→

temperature unit

→

sound alarm

→

lock measurement and other function settings. Under these setting interfaces, 

the user can return to the HOLD interface by pressing the trigger or no operation for 10s.

High Alarm Limit Setting

In the HOLD interface, pressing the "SET" button once will enter the high alarm limit setting interface, and then 
pressing the "    " button can quickly select the preset values (P1-P5). If there is no wanted value among the preset 
values, the user can use 

▼

or “▲” to adjust at any of the preset values that is closest to the wanted one. Short 

“ ”

pressing will add or subtract 1 to the value each time, and long pressing will add or subtract 10 each second.

Laser Indicator

Pressing the       button can turn on/off the laser indication function. When it is turned on, the laser symbol        will 
display on the LCD, and the laser will accurately indicate the measured position.
Note: Please follow the cautions when turning on the laser to avoid eyes injury.

High/Low Temperature Alarm

Pressing the "HI/LO" button can turn on/off the high and low limit alarm function in sequence. The sequence is: 

HI/LO limit alarm functions are turned on at the same time

→

HI limit alarm is turned on

→

LO limit alarm is turned on

→

HI/LO limit alarm functions are turned off at the same time (as shown below).

When the HI alarm is turned on, if the measured temperature is higher than the set high alarm limit, the red LED 
and the HI symbol on the display will flash. If the sound alarm is turned on, the buzzer will beep.
When the LO alarm is turned on, if the measured temperature is lower than the set low alarm limit, the blue LED 
and the LO symbol will flash. If the sound alarm is turned on, the buzzer will beep.

When either HI/LO alarm is turned on, if the measured temperature value is within the range of high and low alarm 
limit, the green LED and the OK symbol will flash.

Technical Indexes