UNI-T UT303D Infrared Thermometers Instruction Manual

P/N:110401108354X
UT3011C+/UT302C+/UT303C+/ UT3DI D +/UT302D +/UT303D+
Infrared Thermometer
User Manual

Preface

Thank you for purchasing the new infrared thermometer. 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 or 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 using this device. As some countries or regions do not allow limitations on implied warranties and incidental or subsequent damages, the above limitation of liability may not apply to you.

Introduction

The UT301C+/UT302C+/UT303C+ ring laser infrared thermometer can quickly and accurately determine the surface temperature by measuring the infrared energy radiated from the target surface. It is suitable for non-contact surface temperature measurement. Ring laser indication is unique to Uni-Trend, which can Indicate the target area under test more accurately and intuitively. The UT301D+/UT302D+/UT303D+ is a dual laser Infrared thermometer. The D:S ratios are: UT301C+/UT301D+: 12:1 UT302C+/UT3020+: 20:1 UT303C+/UT30313+: 30:1

Safety Instructions

Warning: To prevent eye damage or personal injury, please read the following safety instructions before using the thermometer:

• Please do not irradiate people or animals with laser directly or indirectly.
• Please do not look at the laser directly or through other optical tools (telescope, microscope, etc.).

Precautions:

• Do not look directly at the laser emitter.
• Do not disassemble or modify the thermometer or laser.
• To ensure the safety and accuracy of the thermometer, it should only be repaired by a qualified professional using the original replacement parts.
• If the battery symbol on the LCD display is flashing, please replace the battery immediately to prevent inaccurate measurement.
• Inspect the case before using the thermometer. Do not use the thermometer if it appears damaged. Look for cracks or missing plastic.
• Please refer to the emissivity information for the actual temperature. Highly reflective objects or transparent materials can cause the measured temperature value to be lower than the actual temperature.
• When measuring high temperature surfaces, please be aware not to touch them.
• Do not use the thermometer in an environment close to flammable or explosive substances.
• Using the thermometer around steam, dust, or environments with large temperature fluctuations may lead to inaccurate temperature measurement.
• To ensure measurement accuracy, please place the thermometer in the measurement environment for 30 minutes before using.
• Avoid keeping the thermometer near a high temperature environment for long periods.

Technical Specifications

-25. 6°F-2372°F
LCD size| 30mm30mm| 35mm35mm| 35mm*35mm
LCD display| Color EBTN
Accuracy| <0°C: ±(1.5°C+0.1°C/°C); ?0°C: ±1.5°C or ±1.5% of reading, whichever is greater <32°F: ±(3.0°F+0.1°F/°F); 1.32°F: ±3.0°F or ±1.5% of reading, whichever is greater
Temperature coefficient| ±0.1°C/°C or ±0.1%/°C, whichever is greater (±0.1°Ff F or ±0.1%pF, whichever is greater)
Repeatability| 0.7°C or 0.7%, whichever is greater (1.5°F or 0.7%, whichever is greater)
Emissivity| 0.1-1.0 (adjustable, can store 5 sets of preset values)
Response time| 250ms (95% of reading)
Spectral response| Bum-14um
Auto power off| 15s
Low battery indication|
High/Low temperature LED alarm|
---|---
High/Low temperature audible alarm|
Data hold|
Unit conversion (°C/°F)|
MAX/MIN/AVG/DIF mode|
Lock measurement| ****
Data storage| 99 sets
Scheduled measurement| Interval from 1 minute to 4 days; up to 99 times
Laser| Ring/Dual laser, wavelength 630nm-670nm, output power <1mW, class 2 laser| UT302C+/UT303C+: Ring laser, wavelength 630nm-670nm, output power lmW 5 Ps3mW, class 3R laser
UT302D+/UT303D+: Dual laser, wavelength 630nm-670nm, output power <1 mW, class 2 laser
Operating temperature| 0°C-50°C (32°F-122°F)
Storage temperature| -20°C-60°C (-4°F-140°F)
Operating humidity| <90%RH (non-condensing)
Drop test| lm
Battery type| 9V alkaline battery (1604A)
Battery life| 28 hours (continuous temperature measurement)
Product color| Red and grey
Product net weight| 204g| 3109| 310g
Product size| 161.5mmx9Ommx48mm| 179mm x 126.5mm x53m m| 179mm x 126.5mm x 53mm

NOTE: In some places with strong electromagnetic interference, the product measurement result may change by up to ±10°C or 20% of the measured value (taking whichever is greater). If this change occurs, please leave such a place to let the product recover.
Safety Standards:
CE certification: EN61326-1:2013
Laser safety standard: EN60825-1:2014
Reference Standard: JJG 856-2015

Product Features

• Ring laser indication, which can indicate the target area under test more accurately and intuitively (UT301 C+/UT302C+/UT303C+ only)
• Dual laser indication (UT301D+/UT302D+/UT303D+ only)
• Bright color EBTN display
• MAX/MIN/AVG/DIF value reading
• 5 sets of high/low temperature alarm preset values and 5 sets of emissivity preset values can be stored for users to set up quickly.
• With tri-color (red, green and blue) LED and buzzer alarm functions
• Lock measurement, for processes that require temperature monitoring
• 99 sets of data logging with date and time
• Scheduled measurement, for occasions where timing temperature monitoring is required
• Tripod mounting hole

LCD Description

| Lock measurement indicator|
---|---|---
| Buzzer indicator
HOLD| Temperature hold indicator
| Low battery indicator
| Emissivity indication
MAX MIN AVG DIF| Measurement mode indication
| Temperature logging mode and group number
| Date and time
HI OK LO| Temperature measurement alarm indicator
| indicator
SCAN| Temperature measurement indicator
°C°F| Temperature unit indicator
| Main display of the measured temperature
****| display of the measured temperature
Auto Interval| Scheduled measurement mark

External Structure

1. Laser
2. Infrared sensor
3. Trigger
4. Battery cover
5. Tripod mounting hole
6. LCD
7. MODE button
8. SET button
9. HI/LO button
10. LOG button
11. Laser warning label

Operating Instructions

Viewing the Last Measured Value In the off state, short press (less than 0.5s) the trigger to turn on the thermometer and the measurement data held before last shutdown will be displayed. Toggle to view the MAX/MIN/AVG/DIF value by short pressing the MODE button.
Auto Power Off
In the HOLD mode, if there is no operation for 15s, the thermometer will automatically power off and store the currently held measurement.
Manual Measurement

1. Pull and hold the trigger after aiming at the target. The SCAN icon will be flashing indicating that the target object temperature is being measured. The measurement result will be updated on the LCD.
2. Release the trigger, the SCAN icon disappears, and the HOLD icon appears, indicating that the measurement has been stopped and the last measured value is held.

Lock Measurement

1. In the HOLD interface, press the SET button for 3s to enter the lock measurement setting interface, and turn on/off the lock measurement by pressing the or button. When the lock measurement is turned on, short press the LOG button to perform the timing setting “00:00” for the lock measurement. At this time, the selected time position flashes, and the time value can be adjusted by pressing the or button. Set the timing to “00:00” to turn off timing function.
   

2. When the lock measurement is turned on, short press the trigger to enable it. The icon will appear on the thermometer screen and the SCAN icon will flash. The thermometer will continuously measure the target temperature.

3. Pull the trigger again, the and SCAN icons disappear, and the HOLD icon appears. The thermometer stops the measurement and holds the last measured value.

4. After setting the lock measurement time (1 minute to 5 hours), the measurement starts after the activation of the lock function. When the set time is reached, the thermometer will automatically power off and store the last measured value. Short press (less than 0.5s) the trigger to turn on the thermometer to view the measured value
   (NOTE: The measured value will be cleared by long press).

NOTE: During measurement, it is best to ensure that the measured target diameter is twice the spot size (S) of the thermometer, and then determine the test distance (D) according to the D:S diagram (refer to D:S part). For example, if you use the UT301C+ to measure the temperature of an object with a diameter of about 4″ (10cm), then according to the above, the spot size (S) of the thermometer should be about 2″ (5cm) for highest accuracy, and according to the D:S diagram, the measured distance (D) is about 24″ (60 cm).
Measurement Mode with Data Storage Function

1. Enter the measurement mode with data storage function: In the HOLD interface, short press the LOG button to enter the measurement mode with data storage function. The screen will display the LOG icon and the log group number.
   

2. Store data:
   In the measurement mode with data storage function, first select the storage location from “01-99” by pressing the or button. If the selected location has stored data, the temperature value and storage time will be displayed; if there is no data, “—” will be displayed. After selecting the location, pull the trigger for measurement. After completing the measurement, short press the LOG button. The screen will flash three times to indicate the success of the data storage and automatically switch to the next location.

3. Query storage data:
   In the measurement mode with data storage function, press the or button to query the storage data and storage time corresponding to the location. If there is no data, “—” will be displayed.

4. Delete all storage data:
   In the measurement mode with data storage function, long press the LOG button until the log group number is switched to “01” after lOs flashing of the screen.

5. Exit the measurement mode with data storage function:
   In the measurement mode with data storage function, press the LOG button for 3s until the screen starts to flash to exit.

Scheduled Measurement

1. In the HOLD interface, press the SET button for 3s to enter the lock measurement setting interface, then short press the SET button once to enter the scheduled measurement setting interface, and turn on/off the scheduled measurement by pressing the or button (see Figure 1).

2. After turning on the scheduled measurement, follow the steps below to set its parameters: a) Short press the LOG button to select “Year —.Month —.Day —.Hour —.Minute” in turn to set the start time of the scheduled measurement. At this time, the selected setting position flashes, and the value can be adjusted by pressing the or button (see Figure 2).
   NOTE: The start time cannot be set less than the current system time, otherwise the scheduled measurement will not be executed.
   b) After setting the start time, short press the LOG button to select “Hour y Minute” in turn to set the interval time of the scheduled measurement (see Figure 3). c) After setting the interval time, short press the LOG button to set times (01-99) of the scheduled measurement in turn (see Figure 4).
   d) After setting the parameters, press the SET button or pull the trigger to return to the HOLD interface. The Auto Interval icon will flash. When the start time of the scheduled measurement is reached, the thermometer will automatically start temperature measurement and store the current time and measured value. Each time the interval time is reached, the thermometer will automatically measure and store the current data, until the last interval.

3. In the HOLD interface, press the LOG button for 3s to enter the scheduled measurement log value query mode. The screen will display the Auto Interval icon, the LOG icon and the log group number. In this mode, press the or button to query the measured temperature value corresponding to the scheduled time, press the LOG button for 10s to delete all storage values of the scheduled measurement, and short press the LOG button or pull the trigger to exit.

System Time Setting

In the HOLD interface, press the SET button for 3s to enter the lock measurement setting interface, and short press the SET button twice to enter the system time setting interface. Short press the LOG button to select “Year → Month → Day → Hour → Minute” in turn and set the corresponding parameters. At this time, the selected setting position flashes, and the value can be adjusted by pressing the or button. Add or subtract 1 each time by short press, and add or subtract 1 constantly by long press. Short press the SET button or pull the trigger to exit the system time setting.
NOTE: System time needs to be reset after battery replacement or power failure.

MAX/MIN/AVG/DIF Value Reading

Short press the MODE button to switch the “MAX → MIN → AVG→ DIE’ measurement mode in turn and the temperature value of the corresponding mode will be shown in the auxiliary display area (as shown below).

High/Low Temperature Alarm On/Off

Short press the HI/LO button to turn the high/low limit alarm function on and off in sequence.
When HI limit alarm function is turned on and the measured temperature value is higher than the set high alarm limit, the red LED and HI indicator flash. If the audible alarm function has been turned on, the buzzer will beep.
When LO limit alarm function is turned on and the measured temperature value is lower than the set low alarm limit, the blue LED and LO indicator flash. If the audible alarm function has been turned on, the buzzer will beep.
When HI/LO limit alarm function is turned on and the measured temperature value is within the high and low alarm limit range, the green LED lights up and the OK indicator is displayed, indicating that the measured temperature is normal.

Function Setting

In setting mode, pull the trigger, short press the SET button continuously or wait for 10s to exit.

1. High/Low Alarm Limit Setting In the HOLD interface, short press the SET button once/twice to enter the high/low alarm limit setting interface. Short press the LOG button to quickly select the preset high/low alarm limit value (P1-P5). If there is no desired value among the preset values, select any value closest to the high/low alarm limit, and adjust it by pressing the or button. Add or subtract 1 each time by short press, and add or subtract 1 constantly by long press.
   

2. Emissivity Setting In the HOLD interface, short press the SET button until the emissivity setting interface is displayed. Short press the LOG button to quickly select the preset emissivity value (P1-P5). If no desired value among the preset values, select any value closest to the emissivity, and adjust it by pressing the or button. Add or subtract 0.01 each time by short press, and add or subtract 0.01 constantly by long press.

3. Temperature Unit Setting In the HOLD interface, short press the SET button until the temperature unit setting interface is displayed, and switch between °C and °F by pressing the or button.

4. Audible Alarm Setting In the HOLD interface, short press the SET button until the audible alarm setting interface is displayed, and turn on/off the audible alarm by pressing the or button.

5. Laser Indication Function Setting In the HOLD interface, short press the SET button until the laser indication function setting interface is displayed, and turn on/off the laser indication function by pressing the or button. When it is turned on, the laser indicator A, will be displayed on the LCD, and the laser will accurately indicate the position you are measuring during temperature measurement. NOTE: Please follow the laser precautions when the laser is turned on to avoid damage to human or animal eyes.

D:S (Distance and Spot Size)

As the distance (D) from the target being measured to the thermometer increases, the spot size (S) on the measured area becomes larger. The relationship between the distance and the spot size is as shown below.

Field of View

Make sure that the measured target is larger than the spot size. The smaller the target, the closer the test distance should be (please refer to D:S for the spot size at different distances). To obtain the optimum measurement result, it is recommended that the target being measured is 2 times larger than the spot size.
Emissivity Emissivity is a symbol of the energy radiation of a material. The emissivity of most organic materials and coated or oxidized surfaces is about 0.95. To measure the temperature of a bright metal surface, cover the surface to be tested with masking tape or matt black paint with a high emissivity setting (if it is possible), wait for a period of time, and measure the temperature of the tape or black paint surface when it reaches the same temperature on the surface of the object covered below. The total emissivity of some metals and non-metals are listed in the following table.

Metal
Aluminum
Oxidization| 0.2-0.4
A3003 Alloy
Oxidization
Rough| 0.3
0.1-0.3
Brass
Burnishing
Oxidization| 0.3
0.5
Copper
Oxidization
Electric Terminal Board| 0.4-0.8
0.6
Hastelloy
Alloy| 0.3-0.8
Inconel
Oxidization
Sand-Blasting
Electro Burnishing| 0.7-0.95
0.3-0.6
0.15
Iron
Oxidization
Rusting| 0.5-0.9
0.5-0.7
Iron (Casting)
Oxidization
Non-Oxidization
Casting| 0.6-0.95
0.2
0.2-0.3
 Iron (Forging)
Passivation| 0.9
Lead
Rough
Oxidization| 0.4
0.2-0.6
Molybdenum
Oxidization| 0.2-0.6
Nickel
Oxidization| 0.2-0.5
Platinum Black| 0.9
Steel
Cold Rolling
Steel Plate Rubbing
Steel Plate Burnishing| 0.7-0.9
0.4-0.6
0.1
Zinc
Oxidization| 0.1
 Non-Metal
Asbestos
Asphalt
Basalt| 0.95
0.95
0.7
Carbon
Non-Oxidization
Graphite
Silicon Carbide| 0.8-0.9
0.7-0.8
0.9
Ceramics| 0.95
Clay| 0.95
Concrete| 0.95
Cloth| 0.9
Glass
Convex Glass
Smooth Glass
Lead-Boron Glass| 0.76-0.8
0.92-0.94
0.78-0.82
Plates| 0.96
Plaster| 0.8-0.95
Ice| 0.98
Limestone| 0.98
Paper| 0.95
Plastics| 0.95
Water| 0.93
Soil| 0.9-0.98
Wood| 0.9-0.95

Maintenance

Clean Use clean compressed air to blow away falling particles. Use wet cotton swab to carefully wipe lens surface. Use wet sponge or soft cloth to clean product exterior. Do not rinse the thermometer or immerse it in water. Battery Replacement
Install or replace a 9V alkaline battery (1604A) as follows:

1. Open the battery cover.
2. Insert the battery and pay attention to the polarity.
3. Close the battery cover.

during measurement
during measurement

Troubleshooting

it can be recovered after 30 minutes
Battery indicator flashes| Low battery| Replace the battery
Laser fails to work / Weak laser| Low battery| Replace the battery
The measurement is inaccurate| Emissivity mismatching, measured distance is too far, measured target diameter is less than 20mm, etc.| Please refer to the instructions for field of view, D:S, etc.

UNI-TREND TECHNOLOGY (CHINA) CO., LTD.
No.6, Gong Ye Bei 1st Road,
Songshan Lake National High-Tech Industrial
Development Zone, Dongguan City,
Guangdong Province, China
Tel: (86-769) 8572 3888
www.uni-trend.com
Made in China

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